+++ /dev/null
-/*
- This file is part of GNUnet.
- Copyright (C) 2013, 2016 GNUnet e.V.
-
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- 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
- Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- SPDX-License-Identifier: AGPL3.0-or-later
-*/
-
-/**
- * @file dv/gnunet-service-dv.c
- * @brief the distance vector service, primarily handles gossip of nearby
- * peers and sending/receiving DV messages from core and decapsulating
- * them
- *
- * @author Christian Grothoff
- * @author Nathan Evans
- */
-#include "platform.h"
-#include "gnunet_util_lib.h"
-#include "gnunet_protocols.h"
-#include "gnunet_core_service.h"
-#include "gnunet_hello_lib.h"
-#include "gnunet_peerinfo_service.h"
-#include "gnunet_statistics_service.h"
-#include "gnunet_set_service.h"
-#include "gnunet_ats_service.h"
-#include "dv.h"
-#include <gcrypt.h>
-
-
-/**
- * How often do we establish the consensu?
- */
-#define GNUNET_DV_CONSENSUS_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 5)
-
-/**
- * Maximum number of messages we queue per peer.
- */
-#define MAX_QUEUE_SIZE 16
-
-/**
- * Maximum number of messages we queue towards the clients/plugin.
- */
-#define MAX_QUEUE_SIZE_PLUGIN 1024
-
-/**
- * The default fisheye depth, from how many hops away will
- * we keep peers?
- */
-#define DEFAULT_FISHEYE_DEPTH 3
-
-/**
- * How many hops is a direct neighbor away?
- */
-#define DIRECT_NEIGHBOR_COST 1
-
-
-GNUNET_NETWORK_STRUCT_BEGIN
-
-/**
- * Information about a peer DV can route to. These entries are what
- * we use as the binary format to establish consensus to create our
- * routing table and as the address format in the HELLOs.
- */
-struct Target
-{
-
- /**
- * Identity of the peer we can reach.
- */
- struct GNUNET_PeerIdentity peer;
-
- /**
- * How many hops (1-3) is this peer away? in network byte order
- */
- uint32_t distance GNUNET_PACKED;
-
-};
-
-
-/**
- * Message exchanged between DV services (via core), requesting a
- * message to be routed.
- */
-struct RouteMessage
-{
- /**
- * Type: #GNUNET_MESSAGE_TYPE_DV_ROUTE
- */
- struct GNUNET_MessageHeader header;
-
- /**
- * Expected (remaining) distance. Must be always smaller than
- * #DEFAULT_FISHEYE_DEPTH, should be zero at the target. Must
- * be decremented by one at each hop. Peers must not forward
- * these messages further once the counter has reached zero.
- */
- uint32_t distance GNUNET_PACKED;
-
- /**
- * The (actual) target of the message (this peer, if distance is zero).
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * The (actual) sender of the message.
- */
- struct GNUNET_PeerIdentity sender;
-
-};
-
-GNUNET_NETWORK_STRUCT_END
-
-
-/**
- * Information about a direct neighbor (core-level, excluding
- * DV-links, only DV-enabled peers).
- */
-struct DirectNeighbor
-{
-
- /**
- * Identity of the peer.
- */
- struct GNUNET_PeerIdentity peer;
-
- /**
- * Session ID we use whenever we create a set union with
- * this neighbor; constructed from the XOR of our peer
- * IDs and then salted with "DV-SALT" to avoid conflicts
- * with other applications.
- */
- struct GNUNET_HashCode real_session_id;
-
- /**
- * Transmit handle to core service.
- */
- struct GNUNET_MQ_Handle *mq;
-
- /**
- * Routing table of the neighbor, NULL if not yet established.
- * Keys are peer identities, values are 'struct Target' entries.
- * Note that the distances in the targets are from the point-of-view
- * of the peer, not from us!
- */
- struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table;
-
- /**
- * Updated routing table of the neighbor, under construction,
- * NULL if we are not currently building it.
- * Keys are peer identities, values are 'struct Target' entries.
- * Note that the distances in the targets are from the point-of-view
- * of the other peer, not from us!
- */
- struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table_consensus;
-
- /**
- * Our current (exposed) routing table as a set.
- */
- struct GNUNET_SET_Handle *my_set;
-
- /**
- * Handle for our current active set union operation.
- */
- struct GNUNET_SET_OperationHandle *set_op;
-
- /**
- * Handle used if we are listening for this peer, waiting for the
- * other peer to initiate construction of the set union. NULL if
- * we ar the initiating peer.
- */
- struct GNUNET_SET_ListenHandle *listen_handle;
-
- /**
- * ID of the task we use to (periodically) update our consensus
- * with this peer. Used if we are the initiating peer.
- */
- struct GNUNET_SCHEDULER_Task *initiate_task;
-
- /**
- * At what offset are we, with respect to inserting our own routes
- * into the consensus?
- */
- unsigned int consensus_insertion_offset;
-
- /**
- * At what distance are we, with respect to inserting our own routes
- * into the consensus?
- */
- unsigned int consensus_insertion_distance;
-
- /**
- * Elements in consensus
- */
- unsigned int consensus_elements;
-
- /**
- * Direct one hop route
- */
- struct Route *direct_route;
-
- /**
- * Flag set within 'check_target_removed' to trigger full global route refresh.
- */
- int target_removed;
-
- /**
- * Our distance to this peer, 0 for unknown.
- */
- uint32_t distance;
-
- /**
- * The network this peer is in
- */
- enum GNUNET_NetworkType network;
-
- /**
- * Is this neighbor connected at the core level?
- */
- int connected;
-
-};
-
-
-/**
- * A route includes information about the next hop,
- * the target, and the ultimate distance to the
- * target.
- */
-struct Route
-{
-
- /**
- * Which peer do we need to forward the message to?
- */
- struct DirectNeighbor *next_hop;
-
- /**
- * What would be the target, and how far is it away?
- */
- struct Target target;
-
- /**
- * Offset of this target in the respective consensus set.
- */
- unsigned int set_offset;
-
-};
-
-
-/**
- * Set of targets we bring to a consensus; all targets in a set have a
- * distance equal to the sets distance (which is implied by the array
- * index of the set).
- */
-struct ConsensusSet
-{
-
- /**
- * Array of targets in the set, may include NULL entries if a
- * neighbor has disconnected; the targets are allocated with the
- * respective container (all_routes), not here.
- */
- struct Route **targets;
-
- /**
- * Size of the @e targets array.
- */
- unsigned int array_length;
-
-};
-
-
-/**
- * Peermap of all of our neighbors; processing these usually requires
- * first checking to see if the peer is core-connected and if the
- * distance is 1, in which case they are direct neighbors.
- */
-static struct GNUNET_CONTAINER_MultiPeerMap *direct_neighbors;
-
-/**
- * Hashmap with all routes that we currently support; contains
- * routing information for all peers from distance 2
- * up to distance #DEFAULT_FISHEYE_DEPTH.
- */
-static struct GNUNET_CONTAINER_MultiPeerMap *all_routes;
-
-/**
- * Array of consensus sets we expose to the outside world. Sets
- * are structured by the distance to the target.
- */
-static struct ConsensusSet consensi[DEFAULT_FISHEYE_DEPTH];
-
-/**
- * Handle to the core service api.
- */
-static struct GNUNET_CORE_Handle *core_api;
-
-/**
- * The identity of our peer.
- */
-static struct GNUNET_PeerIdentity my_identity;
-
-/**
- * The configuration for this service.
- */
-static const struct GNUNET_CONFIGURATION_Handle *cfg;
-
-/**
- * The client, the DV plugin connected to us (or an event monitor).
- * Hopefully this client will never change, although if the plugin
- * dies and returns for some reason it may happen.
- */
-static struct GNUNET_NotificationContext *nc;
-
-/**
- * Handle for the statistics service.
- */
-static struct GNUNET_STATISTICS_Handle *stats;
-
-/**
- * Handle to ATS service.
- */
-static struct GNUNET_ATS_PerformanceHandle *ats;
-
-/**
- * Task scheduled to refresh routes based on direct neighbours.
- */
-static struct GNUNET_SCHEDULER_Task *rr_task;
-
-/**
- * #GNUNET_YES if we are shutting down.
- */
-static int in_shutdown;
-
-/**
- * Start creating a new DV set union by initiating the connection.
- *
- * @param cls the 'struct DirectNeighbor' of the peer we're building
- * a routing consensus with
- */
-static void
-initiate_set_union (void *cls);
-
-
-/**
- * Start creating a new DV set union construction, our neighbour has
- * asked for it (callback for listening peer).
- *
- * @param cls the 'struct DirectNeighbor' of the peer we're building
- * a routing consensus with
- * @param other_peer the other peer
- * @param context_msg message with application specific information from
- * the other peer
- * @param request request from the other peer, use GNUNET_SET_accept
- * to accept it, otherwise the request will be refused
- * Note that we don't use a return value here, as it is also
- * necessary to specify the set we want to do the operation with,
- * whith sometimes can be derived from the context message.
- * Also necessary to specify the timeout.
- */
-static void
-listen_set_union (void *cls,
- const struct GNUNET_PeerIdentity *other_peer,
- const struct GNUNET_MessageHeader *context_msg,
- struct GNUNET_SET_Request *request);
-
-
-/**
- * Forward a message from another peer to the plugin.
- *
- * @param message the message to send to the plugin
- * @param origin the original sender of the message
- * @param distance distance to the original sender of the message
- */
-static void
-send_data_to_plugin (const struct GNUNET_MessageHeader *message,
- const struct GNUNET_PeerIdentity *origin,
- uint32_t distance)
-{
- struct GNUNET_DV_ReceivedMessage *received_msg;
- size_t size;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering message from peer `%s' at distance %u\n",
- GNUNET_i2s (origin),
- (unsigned int) distance);
- size = sizeof (struct GNUNET_DV_ReceivedMessage) +
- ntohs (message->size);
- if (size >= GNUNET_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0); /* too big */
- return;
- }
- received_msg = GNUNET_malloc (size);
- received_msg->header.size = htons (size);
- received_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DV_RECV);
- received_msg->distance = htonl (distance);
- received_msg->sender = *origin;
- GNUNET_memcpy (&received_msg[1], message, ntohs (message->size));
- GNUNET_notification_context_broadcast (nc,
- &received_msg->header,
- GNUNET_YES);
- GNUNET_free (received_msg);
-}
-
-
-/**
- * Forward a control message to the plugin.
- *
- * @param message the message to send to the plugin
- */
-static void
-send_control_to_plugin (const struct GNUNET_MessageHeader *message)
-{
- GNUNET_notification_context_broadcast (nc,
- message,
- GNUNET_NO);
-}
-
-
-/**
- * Send a DISTANCE_CHANGED message to the plugin.
- *
- * @param peer peer with a changed distance
- * @param distance new distance to the peer
- * @param network network used by the neighbor
- */
-static void
-send_distance_change_to_plugin (const struct GNUNET_PeerIdentity *peer,
- uint32_t distance,
- enum GNUNET_NetworkType network)
-{
- struct GNUNET_DV_DistanceUpdateMessage du_msg;
-
- GNUNET_break (GNUNET_NT_UNSPECIFIED != network);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering DISTANCE_CHANGED for message about peer `%s'\n",
- GNUNET_i2s (peer));
- du_msg.header.size = htons (sizeof (du_msg));
- du_msg.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISTANCE_CHANGED);
- du_msg.distance = htonl (distance);
- du_msg.peer = *peer;
- du_msg.network = htonl ((uint32_t) network);
- send_control_to_plugin (&du_msg.header);
-}
-
-
-/**
- * Give a CONNECT message to the plugin.
- *
- * @param target peer that connected
- * @param distance distance to the target
- * @param network the network the next hop is located in
- */
-static void
-send_connect_to_plugin (const struct GNUNET_PeerIdentity *target,
- uint32_t distance,
- enum GNUNET_NetworkType network)
-{
- struct GNUNET_DV_ConnectMessage cm;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering CONNECT about peer %s with distance %u\n",
- GNUNET_i2s (target), distance);
- cm.header.size = htons (sizeof (cm));
- cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
- cm.distance = htonl (distance);
- cm.network = htonl ((uint32_t) network);
- cm.peer = *target;
- send_control_to_plugin (&cm.header);
-}
-
-
-/**
- * Give a DISCONNECT message to the plugin.
- *
- * @param target peer that disconnected
- */
-static void
-send_disconnect_to_plugin (const struct GNUNET_PeerIdentity *target)
-{
- struct GNUNET_DV_DisconnectMessage dm;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering DISCONNECT about peer `%s'\n",
- GNUNET_i2s (target));
- dm.header.size = htons (sizeof (dm));
- dm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
- dm.reserved = htonl (0);
- dm.peer = *target;
- send_control_to_plugin (&dm.header);
-}
-
-
-/**
- * Forward the given payload to the given target.
- *
- * @param target where to send the message
- * @param distance distance to the @a sender
- * @param sender original sender of the message
- * @param actual_target ultimate recipient for the message
- * @param payload payload of the message
- */
-static void
-forward_payload (struct DirectNeighbor *target,
- uint32_t distance,
- const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_PeerIdentity *actual_target,
- const struct GNUNET_MessageHeader *payload)
-{
- struct GNUNET_MQ_Envelope *env;
- struct RouteMessage *rm;
-
- if ( (GNUNET_MQ_get_length (target->mq) >= MAX_QUEUE_SIZE) &&
- (0 != memcmp (sender,
- &my_identity,
- sizeof (struct GNUNET_PeerIdentity))) )
- {
- /* not _our_ client and queue is full, drop */
- GNUNET_STATISTICS_update (stats,
- "# messages dropped",
- 1,
- GNUNET_NO);
- return;
- }
- if (sizeof (struct RouteMessage) + ntohs (payload->size)
- >= GNUNET_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- env = GNUNET_MQ_msg_nested_mh (rm,
- GNUNET_MESSAGE_TYPE_DV_ROUTE,
- payload);
- rm->distance = htonl (distance);
- rm->target = *actual_target;
- rm->sender = *sender;
- GNUNET_MQ_send (target->mq,
- env);
-}
-
-
-/**
- * Find a free slot for storing a 'route' in the 'consensi'
- * set at the given distance.
- *
- * @param distance distance to use for the set slot
- */
-static unsigned int
-get_consensus_slot (uint32_t distance)
-{
- struct ConsensusSet *cs;
- unsigned int i;
-
- GNUNET_assert (distance < DEFAULT_FISHEYE_DEPTH);
- cs = &consensi[distance];
- i = 0;
- while ( (i < cs->array_length) &&
- (NULL != cs->targets[i]) ) i++;
- if (i == cs->array_length)
- {
- GNUNET_array_grow (cs->targets,
- cs->array_length,
- cs->array_length * 2 + 2);
- }
- return i;
-}
-
-
-/**
- * Allocate a slot in the consensus set for a route.
- *
- * @param route route to initialize
- * @param distance which consensus set to use
- */
-static void
-allocate_route (struct Route *route,
- uint32_t distance)
-{
- unsigned int i;
-
- if (distance >= DEFAULT_FISHEYE_DEPTH)
- {
- route->target.distance = htonl (distance);
- route->set_offset = UINT_MAX; /* invalid slot */
- return;
- }
- i = get_consensus_slot (distance);
- route->set_offset = i;
- consensi[distance].targets[i] = route;
- route->target.distance = htonl (distance);
-}
-
-
-/**
- * Release a slot in the consensus set for a route.
- *
- * @param route route to release the slot from
- */
-static void
-release_route (struct Route *route)
-{
- if (UINT_MAX == route->set_offset)
- return;
- GNUNET_assert (ntohl (route->target.distance) < DEFAULT_FISHEYE_DEPTH);
- consensi[ntohl (route->target.distance)].targets[route->set_offset] = NULL;
- route->set_offset = UINT_MAX; /* indicate invalid slot */
-}
-
-
-/**
- * Move a route from one consensus set to another.
- *
- * @param route route to move
- * @param new_distance new distance for the route (destination set)
- */
-static void
-move_route (struct Route *route,
- uint32_t new_distance)
-{
- release_route (route);
- allocate_route (route, new_distance);
-}
-
-
-/**
- * Initialize this neighbors 'my_set' and when done give
- * it to the pending set operation for execution.
- *
- * Add a single element to the set per call:
- *
- * If we reached the last element of a consensus element: increase distance
- *
- *
- * @param cls the neighbor for which we are building the set
- */
-static void
-build_set (void *cls)
-{
- struct DirectNeighbor *neighbor = cls;
- struct GNUNET_SET_Element element;
- struct Target *target;
- struct Route *route;
-
- target = NULL;
- /* skip over NULL entries */
- while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
- (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
- (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
- neighbor->consensus_insertion_offset++;
- while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
- (consensi[neighbor->consensus_insertion_distance].array_length == neighbor->consensus_insertion_offset) )
- {
- /* If we reached the last element of a consensus array element: increase distance and start with next array */
- neighbor->consensus_insertion_offset = 0;
- neighbor->consensus_insertion_distance++;
- /* skip over NULL entries */
- while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
- (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
- (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
- neighbor->consensus_insertion_offset++;
- }
- if (DEFAULT_FISHEYE_DEPTH == neighbor->consensus_insertion_distance)
- {
- /* we have added all elements to the set, run the operation */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Finished building my SET for peer `%s' with %u elements, committing\n",
- GNUNET_i2s (&neighbor->peer),
- neighbor->consensus_elements);
- GNUNET_SET_commit (neighbor->set_op,
- neighbor->my_set);
- GNUNET_SET_destroy (neighbor->my_set);
- neighbor->my_set = NULL;
- return;
- }
-
- route = consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset];
- GNUNET_assert (NULL != route);
- target = &route->target;
- GNUNET_assert (ntohl (target->distance) < DEFAULT_FISHEYE_DEPTH);
- element.size = sizeof (struct Target);
- element.element_type = htons (0);
- element.data = target;
-
- /* Find next non-NULL entry */
- neighbor->consensus_insertion_offset++;
- if ( (0 != memcmp (&target->peer,
- &my_identity,
- sizeof (my_identity))) &&
- (0 != memcmp (&target->peer,
- &neighbor->peer,
- sizeof (struct GNUNET_PeerIdentity))) )
- {
- /* Add target if it is not the neighbor or this peer */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding peer `%s' with distance %u to SET\n",
- GNUNET_i2s (&target->peer),
- ntohl (target->distance) + 1);
- GNUNET_SET_add_element (neighbor->my_set,
- &element,
- &build_set, neighbor);
- neighbor->consensus_elements++;
- }
- else
- build_set (neighbor);
-}
-
-
-/**
- * A peer is now connected to us at distance 1. Initiate DV exchange.
- *
- * @param neighbor entry for the neighbor at distance 1
- */
-static void
-handle_direct_connect (struct DirectNeighbor *neighbor)
-{
- struct Route *route;
- struct GNUNET_HashCode h1;
- struct GNUNET_HashCode h2;
- struct GNUNET_HashCode session_id;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Direct connection to %s established, routing table exchange begins.\n",
- GNUNET_i2s (&neighbor->peer));
- GNUNET_STATISTICS_update (stats,
- "# peers connected (1-hop)",
- 1, GNUNET_NO);
- route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- &neighbor->peer);
- if (NULL != route)
- {
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (all_routes,
- &neighbor->peer,
- route));
- send_disconnect_to_plugin (&neighbor->peer);
- release_route (route);
- GNUNET_free (route);
- }
-
- neighbor->direct_route = GNUNET_new (struct Route);
- neighbor->direct_route->next_hop = neighbor;
- neighbor->direct_route->target.peer = neighbor->peer;
- allocate_route (neighbor->direct_route, DIRECT_NEIGHBOR_COST);
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Adding direct route to %s\n",
- GNUNET_i2s (&neighbor->direct_route->target.peer));
-
-
- /* construct session ID seed as XOR of both peer's identities */
- GNUNET_CRYPTO_hash (&my_identity,
- sizeof (my_identity),
- &h1);
- GNUNET_CRYPTO_hash (&neighbor->peer,
- sizeof (struct GNUNET_PeerIdentity),
- &h2);
- GNUNET_CRYPTO_hash_xor (&h1,
- &h2,
- &session_id);
- /* make sure session ID is unique across applications by salting it with 'DV' */
- GNUNET_CRYPTO_hkdf (&neighbor->real_session_id, sizeof (struct GNUNET_HashCode),
- GCRY_MD_SHA512, GCRY_MD_SHA256,
- "DV-SALT", 2,
- &session_id, sizeof (session_id),
- NULL, 0);
- if (0 < memcmp (&neighbor->peer,
- &my_identity,
- sizeof (struct GNUNET_PeerIdentity)))
- {
- if (NULL != neighbor->listen_handle)
- {
- GNUNET_break (0);
- }
- else
- neighbor->initiate_task = GNUNET_SCHEDULER_add_now (&initiate_set_union,
- neighbor);
- }
- else
- {
- if (NULL != neighbor->listen_handle)
- {
- GNUNET_break (0);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting SET listen operation with peer `%s'\n",
- GNUNET_i2s (&neighbor->peer));
- neighbor->listen_handle = GNUNET_SET_listen (cfg,
- GNUNET_SET_OPERATION_UNION,
- &neighbor->real_session_id,
- &listen_set_union,
- neighbor);
- }
- }
-}
-
-
-/**
- * Method called whenever a peer connects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
- * @param mq message queue for sending data to @a peer
- * @return our `struct DirectNeighbour` for this peer
- */
-static void *
-handle_core_connect (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_MQ_Handle *mq)
-{
- struct DirectNeighbor *neighbor;
-
- /* Check for connect to self message */
- if (0 == memcmp (&my_identity,
- peer,
- sizeof (struct GNUNET_PeerIdentity)))
- return NULL;
- /* check if entry exists */
- neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- peer);
- if (NULL != neighbor)
- {
- GNUNET_break (GNUNET_NT_UNSPECIFIED != neighbor->network);
- GNUNET_break (GNUNET_YES != neighbor->connected);
- neighbor->connected = GNUNET_YES;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Core connected to %s (distance %u)\n",
- GNUNET_i2s (peer),
- (unsigned int) neighbor->distance);
- if (DIRECT_NEIGHBOR_COST != neighbor->distance)
- return NULL;
- handle_direct_connect (neighbor);
- return NULL;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Core connected to %s (distance unknown)\n",
- GNUNET_i2s (peer));
- neighbor = GNUNET_new (struct DirectNeighbor);
- neighbor->peer = *peer;
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
- &neighbor->peer,
- neighbor,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- neighbor->connected = GNUNET_YES;
- neighbor->distance = 0; /* unknown */
- neighbor->network = GNUNET_NT_UNSPECIFIED;
- return neighbor;
-}
-
-
-/**
- * Called for each 'target' in a neighbor table to free the associated memory.
- *
- * @param cls NULL
- * @param key key of the value
- * @param value value to free
- * @return #GNUNET_OK to continue to iterate
- */
-static int
-free_targets (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- GNUNET_free (value);
- return GNUNET_OK;
-}
-
-
-/**
- * Add a new route to the given @a target via the given @a neighbor.
- *
- * @param target the target of the route
- * @param neighbor the next hop for communicating with the @a target
- */
-static void
-add_new_route (struct Target *target,
- struct DirectNeighbor *neighbor)
-{
- struct Route *route;
-
- route = GNUNET_new (struct Route);
- route->next_hop = neighbor;
- route->target.peer = target->peer;
- allocate_route (route, ntohl (target->distance) + 1);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (all_routes,
- &route->target.peer,
- route,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- send_connect_to_plugin (&route->target.peer,
- ntohl (route->target.distance),
- neighbor->network);
-}
-
-
-/**
- * Multipeerhmap iterator for checking if a given route is
- * (now) useful to this peer.
- *
- * @param cls the direct neighbor for the given route
- * @param key key value stored under
- * @param value a 'struct Target' that may or may not be useful; not that
- * the distance in 'target' does not include the first hop yet
- * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
- */
-static int
-check_possible_route (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct DirectNeighbor *neighbor = cls;
- struct Target *target = value;
- struct Route *route;
-
- if (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains (direct_neighbors,
- key))
- return GNUNET_YES; /* direct route, do not care about alternatives */
- route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- key);
- if (NULL != route)
- {
- /* we have an existing route, check how it compares with going via 'target' */
- if (ntohl (route->target.distance) > ntohl (target->distance) + 1)
- {
- /* via 'target' is cheaper than the existing route; switch to alternative route! */
- move_route (route, ntohl (target->distance) + 1);
- route->next_hop = neighbor;
- send_distance_change_to_plugin (&target->peer,
- ntohl (target->distance) + 1,
- neighbor->network);
- }
- return GNUNET_YES; /* got a route to this target already */
- }
- if (ntohl (target->distance) >= DEFAULT_FISHEYE_DEPTH)
- return GNUNET_YES; /* distance is too large to be interesting */
- add_new_route (target, neighbor);
- return GNUNET_YES;
-}
-
-
-/**
- * Multipeermap iterator for finding routes that were previously
- * "hidden" due to a better route (called after a disconnect event).
- *
- * @param cls NULL
- * @param key peer identity of the given direct neighbor
- * @param value a `struct DirectNeighbor` to check for additional routes
- * @return #GNUNET_YES to continue iteration
- */
-static int
-refresh_routes (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct DirectNeighbor *neighbor = value;
-
- if ( (GNUNET_YES != neighbor->connected) ||
- (DIRECT_NEIGHBOR_COST != neighbor->distance) )
- return GNUNET_YES;
- if (NULL != neighbor->neighbor_table)
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
- &check_possible_route,
- neighbor);
- return GNUNET_YES;
-}
-
-
-/**
- * Task to run #refresh_routes() on all direct neighbours.
- *
- * @param cls NULL
- */
-static void
-refresh_routes_task (void *cls)
-{
- rr_task = NULL;
- GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
- &refresh_routes,
- NULL);
-}
-
-
-/**
- * Asynchronously run #refresh_routes() at the next opportunity
- * on all direct neighbours.
- */
-static void
-schedule_refresh_routes ()
-{
- if (NULL == rr_task)
- rr_task = GNUNET_SCHEDULER_add_now (&refresh_routes_task,
- NULL);
-}
-
-
-/**
- * Multipeermap iterator for freeing routes that go via a particular
- * neighbor that disconnected and is thus no longer available.
- *
- * @param cls the direct neighbor that is now unavailable
- * @param key key value stored under
- * @param value a `struct Route` that may or may not go via neighbor
- *
- * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
- */
-static int
-cull_routes (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct DirectNeighbor *neighbor = cls;
- struct Route *route = value;
-
- if (route->next_hop != neighbor)
- return GNUNET_YES; /* not affected */
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
- release_route (route);
- send_disconnect_to_plugin (&route->target.peer);
- GNUNET_free (route);
- return GNUNET_YES;
-}
-
-
-/**
- * Handle the case that a direct connection to a peer is
- * disrupted. Remove all routes via that peer and
- * stop the consensus with it.
- *
- * @param neighbor peer that was disconnected (or at least is no
- * longer at distance 1)
- */
-static void
-handle_direct_disconnect (struct DirectNeighbor *neighbor)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Culling routes via %s due to direct disconnect\n",
- GNUNET_i2s (&neighbor->peer));
- GNUNET_CONTAINER_multipeermap_iterate (all_routes,
- &cull_routes,
- neighbor);
- if (NULL != neighbor->direct_route)
- {
- release_route (neighbor->direct_route);
- GNUNET_free (neighbor->direct_route);
- neighbor->direct_route = NULL;
- }
- if (NULL != neighbor->neighbor_table_consensus)
- {
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
- &free_targets,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
- neighbor->neighbor_table_consensus = NULL;
- }
- if (NULL != neighbor->neighbor_table)
- {
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
- &free_targets,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
- neighbor->neighbor_table = NULL;
- }
- if (NULL != neighbor->set_op)
- {
- GNUNET_SET_operation_cancel (neighbor->set_op);
- neighbor->set_op = NULL;
- }
- if (NULL != neighbor->my_set)
- {
- GNUNET_SET_destroy (neighbor->my_set);
- neighbor->my_set = NULL;
- }
- if (NULL != neighbor->listen_handle)
- {
- GNUNET_SET_listen_cancel (neighbor->listen_handle);
- neighbor->listen_handle = NULL;
- }
- if (NULL != neighbor->initiate_task)
- {
- GNUNET_SCHEDULER_cancel (neighbor->initiate_task);
- neighbor->initiate_task = NULL;
- }
-}
-
-
-/**
- * Function that is called with QoS information about an address; used
- * to update our current distance to another peer.
- *
- * @param cls closure
- * @param address the address
- * @param active #GNUNET_YES if this address is actively used
- * to maintain a connection to a peer;
- * #GNUNET_NO if the address is not actively used;
- * #GNUNET_SYSERR if this address is no longer available for ATS
- * @param bandwidth_out assigned outbound bandwidth for the connection
- * @param bandwidth_in assigned inbound bandwidth for the connection
- * @param prop performance data for the address (as far as known)
- */
-static void
-handle_ats_update (void *cls,
- const struct GNUNET_HELLO_Address *address,
- int active,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
- const struct GNUNET_ATS_Properties *prop)
-{
- struct DirectNeighbor *neighbor;
- uint32_t distance;
- enum GNUNET_NetworkType network;
-
- if (NULL == address)
- {
- /* ATS service temporarily disconnected */
- return;
- }
-
- if (GNUNET_YES != active)
- {
- // FIXME: handle disconnect/inactive case too!
- return;
- }
- distance = prop->distance;
- network = prop->scope;
- GNUNET_break (GNUNET_NT_UNSPECIFIED != network);
- /* check if entry exists */
- neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- &address->peer);
- if (NULL != neighbor)
- {
- neighbor->network = network;
- if (neighbor->distance == distance)
- return; /* nothing new to see here, move along */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "ATS says distance to %s is now %u\n",
- GNUNET_i2s (&address->peer),
- (unsigned int) distance);
- if ( (DIRECT_NEIGHBOR_COST == neighbor->distance) &&
- (DIRECT_NEIGHBOR_COST == distance) )
- return; /* no change */
- if (DIRECT_NEIGHBOR_COST == neighbor->distance)
- {
- neighbor->distance = distance;
- GNUNET_STATISTICS_update (stats,
- "# peers connected (1-hop)",
- -1, GNUNET_NO);
- handle_direct_disconnect (neighbor);
- schedule_refresh_routes ();
- return;
- }
- neighbor->distance = distance;
- if (DIRECT_NEIGHBOR_COST != neighbor->distance)
- return;
- if (GNUNET_YES != neighbor->connected)
- return;
- handle_direct_connect (neighbor);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "ATS says distance to %s is now %u\n",
- GNUNET_i2s (&address->peer),
- (unsigned int) distance);
- neighbor = GNUNET_new (struct DirectNeighbor);
- neighbor->peer = address->peer;
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
- &neighbor->peer,
- neighbor,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- neighbor->connected = GNUNET_NO; /* not yet */
- neighbor->distance = distance;
- neighbor->network = network;
-}
-
-
-/**
- * Check if a target was removed from the set of the other peer; if so,
- * if we also used it for our route, we need to remove it from our
- * 'all_routes' set (and later check if an alternative path now exists).
- *
- * @param cls the `struct DirectNeighbor`
- * @param key peer identity for the target
- * @param value a `struct Target` previously reachable via the given neighbor
- */
-static int
-check_target_removed (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct DirectNeighbor *neighbor = cls;
- struct Target *new_target;
- struct Route *current_route;
-
- new_target = GNUNET_CONTAINER_multipeermap_get (neighbor->neighbor_table_consensus,
- key);
- current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- key);
- if (NULL != new_target)
- {
- /* target was in old set, is in new set */
- if ( (NULL != current_route) &&
- (current_route->next_hop == neighbor) &&
- (current_route->target.distance != new_target->distance) )
- {
- /* need to recalculate routes due to distance change */
- neighbor->target_removed = GNUNET_YES;
- }
- return GNUNET_OK;
- }
- /* target was revoked, check if it was used */
- if ( (NULL == current_route) ||
- (current_route->next_hop != neighbor) )
- {
- /* didn't matter, wasn't used */
- return GNUNET_OK;
- }
- /* remove existing route */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Lost route to %s\n",
- GNUNET_i2s (¤t_route->target.peer));
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (all_routes, key, current_route));
- send_disconnect_to_plugin (¤t_route->target.peer);
- release_route (current_route);
- GNUNET_free (current_route);
- neighbor->target_removed = GNUNET_YES;
- return GNUNET_OK;
-}
-
-
-/**
- * Check if a target was added to the set of the other peer; if it
- * was added or impoves the existing route, do the needed updates.
- *
- * @param cls the `struct DirectNeighbor`
- * @param key peer identity for the target
- * @param value a `struct Target` now reachable via the given neighbor
- */
-static int
-check_target_added (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct DirectNeighbor *neighbor = cls;
- struct Target *target = value;
- struct Route *current_route;
-
- /* target was revoked, check if it was used */
- current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- key);
- if (NULL != current_route)
- {
- /* route exists */
- if (current_route->next_hop == neighbor)
- {
- /* we had the same route before, no change in target */
- if (ntohl (target->distance) + 1 != ntohl (current_route->target.distance))
- {
- /* but distance changed! */
- if (ntohl (target->distance) + 1 > DEFAULT_FISHEYE_DEPTH)
- {
- /* distance increased beyond what is allowed, kill route */
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (all_routes,
- key,
- current_route));
- send_disconnect_to_plugin (key);
- release_route (current_route);
- GNUNET_free (current_route);
- }
- else
- {
- /* distance decreased, update route */
- move_route (current_route,
- ntohl (target->distance) + 1);
- send_distance_change_to_plugin (&target->peer,
- ntohl (target->distance) + 1,
- neighbor->network);
- }
- }
- return GNUNET_OK;
- }
- if (ntohl (current_route->target.distance) <= ntohl (target->distance) + 1)
- {
- /* alternative, shorter route exists, ignore */
- return GNUNET_OK;
- }
- /* new route is better than the existing one, take over! */
- /* NOTE: minor security issue: malicious peers may advertise
- very short routes to take over longer paths; as we don't
- check that the shorter routes actually work, a malicious
- direct neighbor can use this to DoS our long routes */
-
- move_route (current_route, ntohl (target->distance) + 1);
- current_route->next_hop = neighbor;
- send_distance_change_to_plugin (&target->peer,
- ntohl (target->distance) + 1,
- neighbor->network);
- return GNUNET_OK;
- }
- /* new route */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Discovered new route to %s using %u hops\n",
- GNUNET_i2s (&target->peer),
- (unsigned int) (ntohl (target->distance) + 1));
- current_route = GNUNET_new (struct Route);
- current_route->next_hop = neighbor;
- current_route->target.peer = target->peer;
- allocate_route (current_route, ntohl (target->distance) + 1);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (all_routes,
- ¤t_route->target.peer,
- current_route,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
-
- send_connect_to_plugin (¤t_route->target.peer,
- ntohl (current_route->target.distance),
- neighbor->network);
- return GNUNET_OK;
-}
-
-
-/**
- * Callback for set operation results. Called for each element
- * in the result set.
- * We have learned a new route from the other peer. Add it to the
- * route set we're building.
- *
- * @param cls the `struct DirectNeighbor` we're building the consensus with
- * @param element a result element, only valid if status is #GNUNET_SET_STATUS_OK
- * @param current_size current set size
- * @param status see `enum GNUNET_SET_Status`
- */
-static void
-handle_set_union_result (void *cls,
- const struct GNUNET_SET_Element *element,
- uint64_t current_size,
- enum GNUNET_SET_Status status)
-{
- struct DirectNeighbor *neighbor = cls;
- struct DirectNeighbor *dn;
- struct Target *target;
- const struct Target *ctarget;
- char *status_str;
-
- switch (status)
- {
- case GNUNET_SET_STATUS_OK:
- status_str = "GNUNET_SET_STATUS_OK";
- break;
- case GNUNET_SET_STATUS_FAILURE:
- status_str = "GNUNET_SET_STATUS_FAILURE";
- break;
- case GNUNET_SET_STATUS_HALF_DONE:
- status_str = "GNUNET_SET_STATUS_HALF_DONE";
- break;
- case GNUNET_SET_STATUS_DONE:
- status_str = "GNUNET_SET_STATUS_DONE";
- break;
- default:
- status_str = "UNDEFINED";
- break;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got SET union result: %s\n",
- status_str);
- switch (status)
- {
- case GNUNET_SET_STATUS_OK:
- if (sizeof (struct Target) != element->size)
- {
- GNUNET_break_op (0);
- return;
- }
- ctarget = element->data;
- if ( (NULL !=
- (dn = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- &ctarget->peer))) &&
- (DIRECT_NEIGHBOR_COST == dn->distance) )
- {
- /* this is a direct neighbor of ours, we do not care about routes
- to this peer */
- return;
- }
- target = GNUNET_new (struct Target);
- GNUNET_memcpy (target, element->data, sizeof (struct Target));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received information about peer `%s' with distance %u from SET\n",
- GNUNET_i2s (&target->peer),
- ntohl (target->distance) + 1);
-
- if (NULL == neighbor->neighbor_table_consensus)
- neighbor->neighbor_table_consensus
- = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table_consensus,
- &target->peer,
- target,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_break_op (0);
- GNUNET_free (target);
- }
- break;
- case GNUNET_SET_STATUS_FAILURE:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to establish DV union, will try again later\n");
- neighbor->set_op = NULL;
- if (NULL != neighbor->neighbor_table_consensus)
- {
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
- &free_targets,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
- neighbor->neighbor_table_consensus = NULL;
- }
- if (0 < memcmp (&neighbor->peer,
- &my_identity,
- sizeof (struct GNUNET_PeerIdentity)))
- neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
- &initiate_set_union,
- neighbor);
- break;
- case GNUNET_SET_STATUS_HALF_DONE:
- break;
- case GNUNET_SET_STATUS_DONE:
- /* we got all of our updates; integrate routing table! */
- neighbor->target_removed = GNUNET_NO;
- if (NULL == neighbor->neighbor_table_consensus)
- neighbor->neighbor_table_consensus = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
- if (NULL != neighbor->neighbor_table)
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
- &check_target_removed,
- neighbor);
- if (GNUNET_YES == neighbor->target_removed)
- {
- /* check if we got an alternative for the removed routes */
- schedule_refresh_routes ();
- }
- /* add targets that appeared (and check for improved routes) */
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
- &check_target_added,
- neighbor);
- if (NULL != neighbor->neighbor_table)
- {
- GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
- &free_targets,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
- neighbor->neighbor_table = NULL;
- }
- neighbor->neighbor_table = neighbor->neighbor_table_consensus;
- neighbor->neighbor_table_consensus = NULL;
-
- /* operation done, schedule next run! */
- neighbor->set_op = NULL;
- if (0 < memcmp (&neighbor->peer,
- &my_identity,
- sizeof (struct GNUNET_PeerIdentity)))
- neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
- &initiate_set_union,
- neighbor);
- break;
- default:
- GNUNET_break (0);
- return;
- }
-}
-
-
-/**
- * Start creating a new DV set union construction, our neighbour has
- * asked for it (callback for listening peer).
- *
- * @param cls the 'struct DirectNeighbor' of the peer we're building
- * a routing consensus with
- * @param other_peer the other peer
- * @param context_msg message with application specific information from
- * the other peer
- * @param request request from the other peer, use GNUNET_SET_accept
- * to accept it, otherwise the request will be refused
- * Note that we don't use a return value here, as it is also
- * necessary to specify the set we want to do the operation with,
- * whith sometimes can be derived from the context message.
- * Also necessary to specify the timeout.
- */
-static void
-listen_set_union (void *cls,
- const struct GNUNET_PeerIdentity *other_peer,
- const struct GNUNET_MessageHeader *context_msg,
- struct GNUNET_SET_Request *request)
-{
- struct DirectNeighbor *neighbor = cls;
-
- if (NULL == request)
- return; /* why??? */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting to create consensus with %s\n",
- GNUNET_i2s (&neighbor->peer));
- if (NULL != neighbor->set_op)
- {
- GNUNET_SET_operation_cancel (neighbor->set_op);
- neighbor->set_op = NULL;
- }
- if (NULL != neighbor->my_set)
- {
- GNUNET_SET_destroy (neighbor->my_set);
- neighbor->my_set = NULL;
- }
- neighbor->my_set = GNUNET_SET_create (cfg,
- GNUNET_SET_OPERATION_UNION);
- neighbor->set_op = GNUNET_SET_accept (request,
- GNUNET_SET_RESULT_ADDED,
- (struct GNUNET_SET_Option[]) {{ 0 }},
- &handle_set_union_result,
- neighbor);
- neighbor->consensus_insertion_offset = 0;
- neighbor->consensus_insertion_distance = 0;
- neighbor->consensus_elements = 0;
- build_set (neighbor);
-}
-
-
-/**
- * Start creating a new DV set union by initiating the connection.
- *
- * @param cls the `struct DirectNeighbor *` of the peer we're building
- * a routing consensus with
- */
-static void
-initiate_set_union (void *cls)
-{
- struct DirectNeighbor *neighbor = cls;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Initiating SET union with peer `%s'\n",
- GNUNET_i2s (&neighbor->peer));
- neighbor->initiate_task = NULL;
- neighbor->my_set = GNUNET_SET_create (cfg,
- GNUNET_SET_OPERATION_UNION);
- neighbor->set_op = GNUNET_SET_prepare (&neighbor->peer,
- &neighbor->real_session_id,
- NULL,
- GNUNET_SET_RESULT_ADDED,
- (struct GNUNET_SET_Option[]) {{ 0 }},
- &handle_set_union_result,
- neighbor);
- neighbor->consensus_insertion_offset = 0;
- neighbor->consensus_insertion_distance = 0;
- neighbor->consensus_elements = 0;
- build_set (neighbor);
-}
-
-
-/**
- * Check that @a rm is well-formed.
- *
- * @param cls closure
- * @param rm the message
- * @return #GNUNET_OK if @a rm is well-formed.
- */
-static int
-check_dv_route_message (void *cls,
- const struct RouteMessage *rm)
-{
- const struct GNUNET_MessageHeader *payload;
-
- if (ntohs (rm->header.size) < sizeof (struct RouteMessage) + sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- payload = (const struct GNUNET_MessageHeader *) &rm[1];
- if (ntohs (rm->header.size) != sizeof (struct RouteMessage) + ntohs (payload->size))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for DV data messages. Whatever this message
- * contains all we really have to do is rip it out of its
- * DV layering and give it to our pal the DV plugin to report
- * in with.
- *
- * @param cls closure
- * @param rm the message
- */
-static void
-handle_dv_route_message (void *cls,
- const struct RouteMessage *rm)
-{
- struct DirectNeighbor *neighbor = cls;
- const struct GNUNET_MessageHeader *payload;
- struct Route *route;
- struct DirectNeighbor *nneighbor;
- struct DirectNeighbor *dn;
- struct Target *target;
- uint32_t distance;
- char me[5];
- char src[5];
- char prev[5];
- char dst[5];
-
- distance = ntohl (rm->distance);
- payload = (const struct GNUNET_MessageHeader *) &rm[1];
- strncpy (prev, GNUNET_i2s (&neighbor->peer), 4);
- strncpy (me, GNUNET_i2s (&my_identity), 4);
- strncpy (src, GNUNET_i2s (&rm->sender), 4);
- strncpy (dst, GNUNET_i2s (&rm->target), 4);
- prev[4] = me[4] = src[4] = dst[4] = '\0';
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Handling DV message with %u bytes payload of type %u from %s to %s routed by %s to me (%s @ hop %u)\n",
- (unsigned int) (ntohs (rm->header.size) - sizeof (struct RouteMessage)),
- ntohs (payload->type),
- src,
- dst,
- prev,
- me,
- (unsigned int) distance + 1);
-
- if (0 == memcmp (&rm->target,
- &my_identity,
- sizeof (struct GNUNET_PeerIdentity)))
- {
- if ((NULL !=
- (dn = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- &rm->sender))) &&
- (DIRECT_NEIGHBOR_COST == dn->distance))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Discarding DV message, as %s is a direct neighbor\n",
- GNUNET_i2s (&rm->sender));
- GNUNET_STATISTICS_update (stats,
- "# messages discarded (direct neighbor)",
- 1, GNUNET_NO);
- return;
- }
- /* message is for me, check reverse route! */
- route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- &rm->sender);
- if ( (NULL == route) &&
- (distance < DEFAULT_FISHEYE_DEPTH) )
- {
- /* don't have reverse route yet, learn it! */
- target = GNUNET_new (struct Target);
- target->peer = rm->sender;
- target->distance = htonl (distance);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Learning sender %s at distance %u from delivery!\n",
- GNUNET_i2s (&rm->sender),
- (unsigned int) distance + 1);
- if (NULL == neighbor->neighbor_table)
- neighbor->neighbor_table = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table,
- &target->peer,
- target,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_break_op (0);
- GNUNET_free (target);
- return;
- }
- add_new_route (target, neighbor);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering %u bytes from %s to myself!\n",
- ntohs (payload->size),
- GNUNET_i2s (&rm->sender));
- send_data_to_plugin (payload,
- &rm->sender,
- 1 + distance);
- return;
- }
- if ( (NULL == GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- &rm->sender)) &&
- (NULL == GNUNET_CONTAINER_multipeermap_get (all_routes,
- &rm->sender)) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Learning sender %s at distance %u from forwarding!\n",
- GNUNET_i2s (&rm->sender),
- 1 + distance);
- target = GNUNET_new (struct Target);
- target->peer = rm->sender;
- target->distance = htonl (distance);
- if (NULL == neighbor->neighbor_table)
- neighbor->neighbor_table = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table,
- &target->peer,
- target,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_break_op (0);
- GNUNET_free (target);
- return;
- }
- add_new_route (target, neighbor);
- }
-
- route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- &rm->target);
- if (NULL == route)
- {
- nneighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- &rm->target);
- if (NULL == nneighbor)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "No route to %s, not routing %u bytes!\n",
- GNUNET_i2s (&rm->target),
- ntohs (payload->size));
- GNUNET_STATISTICS_update (stats,
- "# messages discarded (no route)",
- 1, GNUNET_NO);
- return;
- }
- }
- else
- {
- nneighbor = route->next_hop;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding message to %s\n",
- GNUNET_i2s (&nneighbor->peer));
- forward_payload (nneighbor,
- distance + 1,
- &rm->sender,
- &rm->target,
- payload);
-}
-
-
-/**
- * Check that @a msg is well-formed
- *
- * @param cls identification of the client
- * @param message the actual message
- * @return #GNUNET_OK if @a msg is well-formed
- */
-static int
-check_dv_send_message (void *cls,
- const struct GNUNET_DV_SendMessage *msg)
-{
- const struct GNUNET_MessageHeader *payload;
-
- if (ntohs (msg->header.size) < sizeof (struct GNUNET_DV_SendMessage) +
- sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- payload = (const struct GNUNET_MessageHeader *) &msg[1];
- if (ntohs (msg->header.size) != sizeof (struct GNUNET_DV_SendMessage) + ntohs (payload->size))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Service server's handler for message send requests (which come
- * bubbling up to us through the DV plugin).
- *
- * @param cls identification of the client
- * @param message the actual message
- */
-static void
-handle_dv_send_message (void *cls,
- const struct GNUNET_DV_SendMessage *msg)
-{
- struct GNUNET_SERVICE_Client *client = cls;
- struct Route *route;
- const struct GNUNET_MessageHeader *payload;
-
- payload = (const struct GNUNET_MessageHeader *) &msg[1];
- route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- &msg->target);
- if (NULL == route)
- {
- /* got disconnected */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "No route to %s, dropping local message of type %u\n",
- GNUNET_i2s (&msg->target),
- ntohs (payload->type));
- GNUNET_STATISTICS_update (stats,
- "# local messages discarded (no route)",
- 1, GNUNET_NO);
- GNUNET_SERVICE_client_continue (client);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding %u bytes of type %u to %s\n",
- ntohs (payload->size),
- ntohs (payload->type),
- GNUNET_i2s (&msg->target));
-
- forward_payload (route->next_hop,
- 0 /* first hop, distance is zero */,
- &my_identity,
- &msg->target,
- payload);
- GNUNET_SERVICE_client_continue (client);
-}
-
-
-/**
- * Cleanup all of the data structures associated with a given neighbor.
- *
- * @param neighbor neighbor to clean up
- */
-static void
-cleanup_neighbor (struct DirectNeighbor *neighbor)
-{
- handle_direct_disconnect (neighbor);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (direct_neighbors,
- &neighbor->peer,
- neighbor));
- GNUNET_free (neighbor);
-}
-
-
-/**
- * Method called whenever a given peer disconnects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
- * @param internal_cls the corresponding `struct DirectNeighbor`
- */
-static void
-handle_core_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- void *internal_cls)
-{
- struct DirectNeighbor *neighbor = internal_cls;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received core peer disconnect message for peer `%s'!\n",
- GNUNET_i2s (peer));
- /* Check for disconnect from self message */
- if (NULL == neighbor)
- return;
- GNUNET_break (GNUNET_YES == neighbor->connected);
- neighbor->connected = GNUNET_NO;
- if (DIRECT_NEIGHBOR_COST == neighbor->distance)
- {
- GNUNET_STATISTICS_update (stats,
- "# peers connected (1-hop)",
- -1,
- GNUNET_NO);
- }
- cleanup_neighbor (neighbor);
- if (GNUNET_YES == in_shutdown)
- return;
- schedule_refresh_routes ();
-}
-
-
-/**
- * Multipeermap iterator for freeing routes. Should never be called.
- *
- * @param cls NULL
- * @param key key value stored under
- * @param value the route to be freed
- * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
- */
-static int
-free_route (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct Route *route = value;
-
- GNUNET_break (0);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
- release_route (route);
- send_disconnect_to_plugin (&route->target.peer);
- GNUNET_free (route);
- return GNUNET_YES;
-}
-
-
-/**
- * Multipeermap iterator for freeing direct neighbors. Should never be called.
- *
- * @param cls NULL
- * @param key key value stored under
- * @param value the direct neighbor to be freed
- * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
- */
-static int
-free_direct_neighbors (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct DirectNeighbor *neighbor = value;
-
- cleanup_neighbor (neighbor);
- return GNUNET_YES;
-}
-
-
-/**
- * Task run during shutdown.
- *
- * @param cls unused
- */
-static void
-shutdown_task (void *cls)
-{
- unsigned int i;
-
- in_shutdown = GNUNET_YES;
- GNUNET_assert (NULL != core_api);
- GNUNET_CORE_disconnect (core_api);
- core_api = NULL;
- GNUNET_ATS_performance_done (ats);
- ats = NULL;
- GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
- &free_direct_neighbors,
- NULL);
- GNUNET_CONTAINER_multipeermap_iterate (all_routes,
- &free_route,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (direct_neighbors);
- GNUNET_CONTAINER_multipeermap_destroy (all_routes);
- GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
- stats = NULL;
- GNUNET_notification_context_destroy (nc);
- nc = NULL;
- for (i=0;i<DEFAULT_FISHEYE_DEPTH;i++)
- {
- GNUNET_array_grow (consensi[i].targets,
- consensi[i].array_length,
- 0);
- }
- if (NULL != rr_task)
- {
- GNUNET_SCHEDULER_cancel (rr_task);
- rr_task = NULL;
- }
-}
-
-
-/**
- * Notify newly connected client about an existing route.
- *
- * @param cls the `struct GNUNET_SERVICE_Client *`
- * @param key peer identity
- * @param value the `struct Route *`
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-notify_client_about_route (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct GNUNET_SERVICE_Client *client = cls;
- struct Route *route = value;
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_DV_ConnectMessage *cm;
-
- env = GNUNET_MQ_msg (cm,
- GNUNET_MESSAGE_TYPE_DV_CONNECT);
- cm->distance = htonl (route->target.distance);
- cm->peer = route->target.peer;
- GNUNET_MQ_send (GNUNET_SERVICE_client_get_mq (client),
- env);
- return GNUNET_OK;
-}
-
-
-/**
- * Handle START-message. This is the first message sent to us
- * by the client (can only be one!).
- *
- * @param cls closure (always NULL)
- * @param client identification of the client
- * @param message the actual message
- */
-static void
-handle_start (void *cls,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_SERVICE_Client *client = cls;
-
- GNUNET_notification_context_add (nc,
- GNUNET_SERVICE_client_get_mq (client));
- GNUNET_SERVICE_client_continue (client);
- GNUNET_CONTAINER_multipeermap_iterate (all_routes,
- ¬ify_client_about_route,
- client);
-}
-
-
-/**
- * Called on core init.
- *
- * @param cls unused
- * @param identity this peer's identity
- */
-static void
-core_init (void *cls,
- const struct GNUNET_PeerIdentity *identity)
-{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "I am peer: %s\n",
- GNUNET_i2s (identity));
- my_identity = *identity;
-}
-
-
-/**
- * Process dv requests.
- *
- * @param cls closure
- * @param c configuration to use
- * @param service the initialized service
- */
-static void
-run (void *cls,
- const struct GNUNET_CONFIGURATION_Handle *c,
- struct GNUNET_SERVICE_Handle *service)
-{
- struct GNUNET_MQ_MessageHandler core_handlers[] = {
- GNUNET_MQ_hd_var_size (dv_route_message,
- GNUNET_MESSAGE_TYPE_DV_ROUTE,
- struct RouteMessage,
- NULL),
- GNUNET_MQ_handler_end ()
- };
- in_shutdown = GNUNET_NO;
- cfg = c;
- direct_neighbors = GNUNET_CONTAINER_multipeermap_create (128,
- GNUNET_NO);
- all_routes = GNUNET_CONTAINER_multipeermap_create (65536,
- GNUNET_NO);
- core_api = GNUNET_CORE_connect (cfg,
- NULL,
- &core_init,
- &handle_core_connect,
- &handle_core_disconnect,
- core_handlers);
-
- if (NULL == core_api)
- return;
- ats = GNUNET_ATS_performance_init (cfg,
- &handle_ats_update,
- NULL);
- if (NULL == ats)
- {
- GNUNET_CORE_disconnect (core_api);
- core_api = NULL;
- return;
- }
- nc = GNUNET_notification_context_create (MAX_QUEUE_SIZE_PLUGIN);
- stats = GNUNET_STATISTICS_create ("dv",
- cfg);
- GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
- NULL);
-}
-
-
-/**
- * Callback called when a client connects to the service.
- *
- * @param cls closure for the service
- * @param c the new client that connected to the service
- * @param mq the message queue used to send messages to the client
- * @return @a c
- */
-static void *
-client_connect_cb (void *cls,
- struct GNUNET_SERVICE_Client *c,
- struct GNUNET_MQ_Handle *mq)
-{
- return c;
-}
-
-
-/**
- * Callback called when a client disconnected from the service
- *
- * @param cls closure for the service
- * @param c the client that disconnected
- * @param internal_cls should be equal to @a c
- */
-static void
-client_disconnect_cb (void *cls,
- struct GNUNET_SERVICE_Client *c,
- void *internal_cls)
-{
- GNUNET_assert (c == internal_cls);
-}
-
-
-/**
- * Define "main" method using service macro.
- */
-GNUNET_SERVICE_MAIN
-("dv",
- GNUNET_SERVICE_OPTION_NONE,
- &run,
- &client_connect_cb,
- &client_disconnect_cb,
- NULL,
- GNUNET_MQ_hd_fixed_size (start,
- GNUNET_MESSAGE_TYPE_DV_START,
- struct GNUNET_MessageHeader,
- NULL),
- GNUNET_MQ_hd_var_size (dv_send_message,
- GNUNET_MESSAGE_TYPE_DV_SEND,
- struct GNUNET_DV_SendMessage,
- NULL),
- GNUNET_MQ_handler_end ());
-
-
-/* end of gnunet-service-dv.c */
+++ /dev/null
-/*
- This file is part of GNUnet
- Copyright (C) 2002--2014 GNUnet e.V.
-
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- 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
- Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- SPDX-License-Identifier: AGPL3.0-or-later
-*/
-
-/**
- * @file dv/plugin_transport_dv.c
- * @brief DV transport service, takes incoming DV requests and deals with
- * the DV service
- * @author Nathan Evans
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include "gnunet_util_lib.h"
-#include "gnunet_protocols.h"
-#include "gnunet_statistics_service.h"
-#include "gnunet_dv_service.h"
-#include "gnunet_transport_service.h"
-#include "gnunet_transport_plugin.h"
-#include "dv.h"
-
-
-#define LOG(kind,...) GNUNET_log_from (kind, "transport-dv",__VA_ARGS__)
-
-
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin;
-
-
-/**
- * Session handle for connections.
- */
-struct GNUNET_ATS_Session
-{
- /**
- * Pointer to the global plugin struct.
- */
- struct Plugin *plugin;
-
- /**
- * Address we use for the other peer.
- */
- struct GNUNET_HELLO_Address *address;
-
- /**
- * To whom are we talking to.
- */
- struct GNUNET_PeerIdentity sender;
-
- /**
- * Number of bytes waiting for transmission to this peer.
- * FIXME: not set yet.
- */
- unsigned long long bytes_in_queue;
-
- /**
- * Number of messages waiting for transmission to this peer.
- * FIXME: not set yet.
- */
- unsigned int msgs_in_queue;
-
- /**
- * Current distance to the given peer.
- */
- uint32_t distance;
-
- /**
- * Current network the next hop peer is located in
- */
- enum GNUNET_NetworkType network;
-
- /**
- * Does the transport service know about this session (and we thus
- * need to call `session_end` when it is released?)
- */
- int active;
-
-};
-
-
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin
-{
- /**
- * Our environment.
- */
- struct GNUNET_TRANSPORT_PluginEnvironment *env;
-
- /**
- * Hash map of sessions (active and inactive).
- */
- struct GNUNET_CONTAINER_MultiPeerMap *sessions;
-
- /**
- * Copy of the handler array where the closures are
- * set to this struct's instance.
- */
- struct GNUNET_SERVER_MessageHandler *handlers;
-
- /**
- * Handle to the DV service
- */
- struct GNUNET_DV_ServiceHandle *dvh;
-
- /**
- * Tokenizer for boxed messages.
- */
- struct GNUNET_SERVER_MessageStreamTokenizer *mst;
-
- /**
- * Function to call about session status changes.
- */
- GNUNET_TRANSPORT_SessionInfoCallback sic;
-
- /**
- * Closure for @e sic.
- */
- void *sic_cls;
-};
-
-
-/**
- * If a session monitor is attached, notify it about the new
- * session state.
- *
- * @param plugin our plugin
- * @param session session that changed state
- * @param state new state of the session
- */
-static void
-notify_session_monitor (struct Plugin *plugin,
- struct GNUNET_ATS_Session *session,
- enum GNUNET_TRANSPORT_SessionState state)
-{
- struct GNUNET_TRANSPORT_SessionInfo info;
-
- if (NULL == plugin->sic)
- return;
- memset (&info, 0, sizeof (info));
- info.state = state;
- info.is_inbound = GNUNET_SYSERR; /* hard to say */
- info.num_msg_pending = session->msgs_in_queue;
- info.num_bytes_pending = session->bytes_in_queue;
- /* info.receive_delay remains zero as this is not supported by DV
- (cannot selectively not receive from 'core') */
- info.session_timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
- info.address = session->address;
- plugin->sic (plugin->sic_cls,
- session,
- &info);
-}
-
-
-/**
- * Notify transport service about the change in distance.
- *
- * @param session session where the distance changed
- */
-static void
-notify_distance_change (struct GNUNET_ATS_Session *session)
-{
- struct Plugin *plugin = session->plugin;
-
- if (GNUNET_YES != session->active)
- return;
- plugin->env->update_address_distance (plugin->env->cls,
- session->address,
- session->distance);
-}
-
-
-/**
- * Function called by MST on each message from the box.
- *
- * @param cls closure with the `struct Plugin *`
- * @param client identification of the client (with the 'struct GNUNET_ATS_Session')
- * @param message the actual message
- * @return #GNUNET_OK on success
- */
-static int
-unbox_cb (void *cls,
- void *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session = client;
-
- session->active = GNUNET_YES;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering message of type %u with %u bytes from peer `%s'\n",
- ntohs (message->type),
- ntohs (message->size),
- GNUNET_i2s (&session->sender));
- plugin->env->receive (plugin->env->cls,
- session->address,
- session,
- message);
- plugin->env->update_address_distance (plugin->env->cls,
- session->address,
- session->distance);
- return GNUNET_OK;
-}
-
-
-/**
- * Handler for messages received from the DV service.
- *
- * @param cls closure with the plugin
- * @param sender sender of the message
- * @param distance how far did the message travel
- * @param msg actual message payload
- */
-static void
-handle_dv_message_received (void *cls,
- const struct GNUNET_PeerIdentity *sender,
- uint32_t distance,
- const struct GNUNET_MessageHeader *msg)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received DV_MESSAGE_RECEIVED message for peer `%s': new distance %u\n",
- GNUNET_i2s (sender),
- distance);
- session = GNUNET_CONTAINER_multipeermap_get (plugin->sessions,
- sender);
- if (NULL == session)
- {
- GNUNET_break (0);
- return;
- }
- if (GNUNET_MESSAGE_TYPE_DV_BOX == ntohs (msg->type))
- {
- /* need to unbox using MST */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Unboxing DV message using MST\n");
- GNUNET_SERVER_mst_receive (plugin->mst,
- session,
- (const char *) &msg[1],
- ntohs (msg->size) - sizeof (struct GNUNET_MessageHeader),
- GNUNET_YES,
- GNUNET_NO);
- return;
- }
- session->active = GNUNET_YES;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering message of type %u with %u bytes from peer `%s'\n",
- ntohs (msg->type),
- ntohs (msg->size),
- GNUNET_i2s (sender));
- plugin->env->receive (plugin->env->cls,
- session->address,
- session,
- msg);
- plugin->env->update_address_distance (plugin->env->cls,
- session->address,
- session->distance);
-}
-
-
-/**
- * Function called if DV starts to be able to talk to a peer.
- *
- * @param cls closure with `struct Plugin *`
- * @param peer newly connected peer
- * @param distance distance to the peer
- * @param network the network the next hop is located in
- */
-static void
-handle_dv_connect (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- uint32_t distance,
- enum GNUNET_NetworkType network)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- GNUNET_break (GNUNET_NT_UNSPECIFIED != network);
- /**
- * This requires transport plugin to be linked to libgnunetats.
- * If you remove it, also remove libgnunetats linkage from Makefile.am
- */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received DV_CONNECT message for peer `%s' with next hop in network %s\n",
- GNUNET_i2s (peer),
- GNUNET_NT_to_string (network));
-
- session = GNUNET_CONTAINER_multipeermap_get (plugin->sessions,
- peer);
- if (NULL != session)
- {
- GNUNET_break (0);
- session->distance = distance;
- notify_distance_change (session);
- return; /* nothing to do */
- }
-
- session = GNUNET_new (struct GNUNET_ATS_Session);
- session->address = GNUNET_HELLO_address_allocate (peer, "dv",
- NULL, 0,
- GNUNET_HELLO_ADDRESS_INFO_NONE);
- session->sender = *peer;
- session->plugin = plugin;
- session->distance = distance;
- session->network = network;
- GNUNET_assert(GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
- &session->sender, session,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Creating new DV session %p for peer `%s' at distance %u\n",
- session,
- GNUNET_i2s (peer),
- distance);
-
- session->active = GNUNET_YES;
- plugin->env->session_start (plugin->env->cls,
- session->address,
- session,
- network);
- plugin->env->update_address_distance (plugin->env->cls,
- session->address,
- session->distance);
-
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_UP);
-}
-
-
-/**
- * Function called if DV distance to a peer is changed.
- *
- * @param cls closure with `struct Plugin *`
- * @param peer connected peer
- * @param distance new distance to the peer
- * @param network network type used for the connection
- */
-static void
-handle_dv_distance_changed (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- uint32_t distance,
- enum GNUNET_NetworkType network)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- GNUNET_break (GNUNET_NT_UNSPECIFIED != network);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received `%s' message for peer `%s': new distance %u\n",
- "DV_DISTANCE_CHANGED",
- GNUNET_i2s (peer),
- distance);
- session = GNUNET_CONTAINER_multipeermap_get (plugin->sessions,
- peer);
- if (NULL == session)
- {
- GNUNET_break (0);
- handle_dv_connect (plugin, peer, distance, network);
- return;
- }
- session->distance = distance;
- notify_distance_change (session);
-}
-
-
-/**
- * Release session object and clean up associated resources.
- *
- * @param session session to clean up
- */
-static void
-free_session (struct GNUNET_ATS_Session *session)
-{
- struct Plugin *plugin = session->plugin;
-
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
- &session->sender,
- session));
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Freeing session %p for peer `%s'\n",
- session,
- GNUNET_i2s (&session->sender));
- if (GNUNET_YES == session->active)
- {
- notify_session_monitor (session->plugin,
- session,
- GNUNET_TRANSPORT_SS_DONE);
- plugin->env->session_end (plugin->env->cls,
- session->address,
- session);
- session->active = GNUNET_NO;
- }
- GNUNET_HELLO_address_free (session->address);
- GNUNET_free (session);
-}
-
-
-/**
- * Function called if DV is no longer able to talk to a peer.
- *
- * @param cls closure with `struct Plugin *`
- * @param peer peer that disconnected
- */
-static void
-handle_dv_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *peer)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received `%s' message for peer `%s'\n",
- "DV_DISCONNECT",
- GNUNET_i2s (peer));
- session = GNUNET_CONTAINER_multipeermap_get (plugin->sessions,
- peer);
- if (NULL == session)
- return; /* nothing to do */
- free_session (session);
-}
-
-
-/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin.
- *
- * @param cls closure
- * @param session the session used
- * @param priority how important is the message
- * @param msgbuf the message to transmit
- * @param msgbuf_size number of bytes in 'msgbuf'
- * @param timeout when should we time out
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...)
- * @param cont_cls closure for @a cont
- * @return number of bytes used (on the physical network, with overheads);
- * -1 on hard errors (i.e. address invalid); 0 is a legal value
- * and does NOT mean that the message was not transmitted (DV)
- */
-static ssize_t
-dv_plugin_send (void *cls,
- struct GNUNET_ATS_Session *session,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_TransmitContinuation cont,
- void *cont_cls)
-{
- struct Plugin *plugin = cls;
- const struct GNUNET_MessageHeader *msg;
- struct GNUNET_MessageHeader *box;
-
- box = NULL;
- msg = (const struct GNUNET_MessageHeader *) msgbuf;
- if (ntohs (msg->size) != msgbuf_size)
- {
- /* need to box */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Boxing DV message\n");
- box = GNUNET_malloc (sizeof (struct GNUNET_MessageHeader) + msgbuf_size);
- box->type = htons (GNUNET_MESSAGE_TYPE_DV_BOX);
- box->size = htons (sizeof (struct GNUNET_MessageHeader) + msgbuf_size);
- GNUNET_memcpy (&box[1], msgbuf, msgbuf_size);
- msg = box;
- }
- GNUNET_DV_send (plugin->dvh,
- &session->sender,
- msg);
- cont (cont_cls,
- &session->sender,
- GNUNET_OK,
- msgbuf_size, 0);
- GNUNET_free_non_null (box);
- return 0; /* DV */
-}
-
-
-/**
- * Function that can be used to force the plugin to disconnect
- * from the given peer and cancel all previous transmissions
- * (and their continuations).
- *
- * @param cls closure with the `struct Plugin *`
- * @param target peer from which to disconnect
- */
-static void
-dv_plugin_disconnect_peer (void *cls,
- const struct GNUNET_PeerIdentity *target)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- session = GNUNET_CONTAINER_multipeermap_get (plugin->sessions,
- target);
- if (NULL == session)
- return; /* nothing to do */
- session->active = GNUNET_NO;
-}
-
-
-/**
- * Function that can be used to force the plugin to disconnect
- * from the given peer and cancel all previous transmissions
- * (and their continuations).
- *
- * @param cls closure with the `struct Plugin *`
- * @param session which session to disconnect
- * @return #GNUNET_OK
- */
-static int
-dv_plugin_disconnect_session (void *cls,
- struct GNUNET_ATS_Session *session)
-{
- session->active = GNUNET_NO;
- return GNUNET_OK;
-}
-
-
-/**
- * Convert the transports address to a nice, human-readable
- * format.
- *
- * @param cls closure
- * @param type name of the transport that generated the address
- * @param addr one of the addresses of the host, NULL for the last address
- * the specific address format depends on the transport
- * @param addrlen length of the address
- * @param numeric should (IP) addresses be displayed in numeric form?
- * @param timeout after how long should we give up?
- * @param asc function to call on each string
- * @param asc_cls closure for @a asc
- */
-static void
-dv_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressStringCallback asc,
- void *asc_cls)
-{
- if ( (0 == addrlen) &&
- (0 == strcmp (type, "dv")) )
- asc (asc_cls,
- "dv",
- GNUNET_OK);
- else
- asc (asc_cls,
- NULL,
- GNUNET_SYSERR);
- asc (asc_cls,
- NULL,
- GNUNET_OK);
-}
-
-
-/**
- * Convert the DV address to a pretty string.
- *
- * @param cls closure
- * @param addr the (hopefully) DV address
- * @param addrlen the length of the @a addr
- * @return string representing the DV address
- */
-static const char *
-dv_plugin_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
-{
- if (0 != addrlen)
- {
- GNUNET_break (0); /* malformed */
- return NULL;
- }
- return "dv";
-}
-
-
-/**
- * Another peer has suggested an address for this peer and transport
- * plugin. Check that this could be a valid address. This function
- * is not expected to 'validate' the address in the sense of trying to
- * connect to it but simply to see if the binary format is technically
- * legal for establishing a connection to this peer (and make sure that
- * the address really corresponds to our network connection/settings
- * and not some potential man-in-the-middle).
- *
- * @param cls closure
- * @param addr pointer to the address
- * @param addrlen length of @a addr
- * @return #GNUNET_OK if this is a plausible address for this peer
- * and transport, #GNUNET_SYSERR if not
- *
- */
-static int
-dv_plugin_check_address (void *cls,
- const void *addr,
- size_t addrlen)
-{
- if (0 != addrlen)
- return GNUNET_SYSERR;
- return GNUNET_OK;
-}
-
-
-/**
- * Create a new session to transmit data to the target
- * This session will used to send data to this peer and the plugin will
- * notify us by calling the env->session_end function
- *
- * @param cls the plugin
- * @param address the address
- * @return the session if the address is valid, NULL otherwise
- */
-static struct GNUNET_ATS_Session *
-dv_get_session (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session;
-
- if (0 != address->address_length)
- return NULL;
- session = GNUNET_CONTAINER_multipeermap_get (plugin->sessions,
- &address->peer);
- if (NULL == session)
- return NULL; /* not valid right now */
- session->active = GNUNET_YES;
- return session;
-}
-
-
-/**
- * Function called to convert a string address to
- * a binary address.
- *
- * @param cls closure ('struct Plugin*')
- * @param addr string address
- * @param addrlen length of the @a addr including \0 termination
- * @param buf location to store the buffer
- * If the function returns #GNUNET_SYSERR, its contents are undefined.
- * @param added length of created address
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
- */
-static int
-dv_plugin_string_to_address (void *cls,
- const char *addr,
- uint16_t addrlen,
- void **buf,
- size_t *added)
-{
- if ( (addrlen == 3) &&
- (0 == strcmp ("dv", addr)) )
- {
- *added = 0;
- return GNUNET_OK;
- }
- return GNUNET_SYSERR;
-}
-
-
-/**
- * Function that will be called whenever the transport service wants to
- * notify the plugin that a session is still active and in use and
- * therefore the session timeout for this session has to be updated
- *
- * @param cls closure (`struct Plugin *`)
- * @param peer which peer was the session for
- * @param session which session is being updated
- */
-static void
-dv_plugin_update_session_timeout (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_ATS_Session *session)
-{
- /* DV currently doesn't time out like "normal" plugins,
- so it should be safe to do nothing, right?
- (or should we add an internal timeout?) */
-}
-
-
-/**
- * Function to obtain the network type for a session
- * FIXME: we should probably look at the network type
- * used by the next hop here. Or find some other way
- * to properly allow ATS-DV resource allocation.
- *
- * @param cls closure (`struct Plugin *`)
- * @param session the session
- * @return the network type
- */
-static enum GNUNET_NetworkType
-dv_get_network (void *cls,
- struct GNUNET_ATS_Session *session)
-{
- GNUNET_assert (NULL != session);
- return session->network;
-}
-
-
-/**
- * Function obtain the network type for an address.
- *
- * @param cls closure (`struct Plugin *`)
- * @param address the address
- * @return the network type
- */
-static enum GNUNET_NetworkType
-dv_plugin_get_network_for_address (void *cls,
- const struct GNUNET_HELLO_Address *address)
-{
- return GNUNET_NT_WAN; /* FOR NOW */
-}
-
-
-/**
- * Function that is called to get the keepalive factor.
- * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
- * calculate the interval between keepalive packets.
- *
- * @param cls closure with the `struct Plugin`
- * @return keepalive factor
- */
-static unsigned int
-dv_plugin_query_keepalive_factor (void *cls)
-{
- return 3;
-}
-
-
-/**
- * Return information about the given session to the
- * monitor callback.
- *
- * @param cls the `struct Plugin` with the monitor callback (`sic`)
- * @param peer peer we send information about
- * @param value our `struct GNUNET_ATS_Session` to send information about
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-send_session_info_iter (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- void *value)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_ATS_Session *session = value;
-
- if (GNUNET_YES != session->active)
- return GNUNET_OK;
- notify_session_monitor (plugin,
- session,
- GNUNET_TRANSPORT_SS_UP);
- return GNUNET_OK;
-}
-
-
-/**
- * Begin monitoring sessions of a plugin. There can only
- * be one active monitor per plugin (i.e. if there are
- * multiple monitors, the transport service needs to
- * multiplex the generated events over all of them).
- *
- * @param cls closure of the plugin
- * @param sic callback to invoke, NULL to disable monitor;
- * plugin will being by iterating over all active
- * sessions immediately and then enter monitor mode
- * @param sic_cls closure for @a sic
- */
-static void
-dv_plugin_setup_monitor (void *cls,
- GNUNET_TRANSPORT_SessionInfoCallback sic,
- void *sic_cls)
-{
- struct Plugin *plugin = cls;
-
- plugin->sic = sic;
- plugin->sic_cls = sic_cls;
- if (NULL != sic)
- {
- GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
- &send_session_info_iter,
- plugin);
- /* signal end of first iteration */
- sic (sic_cls, NULL, NULL);
- }
-}
-
-
-/**
- * Entry point for the plugin.
- *
- * @param cls closure with the plugin environment
- * @return plugin API
- */
-void *
-libgnunet_plugin_transport_dv_init (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
- struct GNUNET_TRANSPORT_PluginFunctions *api;
- struct Plugin *plugin;
-
- plugin = GNUNET_new (struct Plugin);
- plugin->env = env;
- plugin->sessions = GNUNET_CONTAINER_multipeermap_create (1024 * 8, GNUNET_YES);
- plugin->mst = GNUNET_SERVER_mst_create (&unbox_cb,
- plugin);
- plugin->dvh = GNUNET_DV_service_connect (env->cfg,
- plugin,
- &handle_dv_connect,
- &handle_dv_distance_changed,
- &handle_dv_disconnect,
- &handle_dv_message_received);
- if (NULL == plugin->dvh)
- {
- GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
- GNUNET_SERVER_mst_destroy (plugin->mst);
- GNUNET_free (plugin);
- return NULL;
- }
- api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
- api->cls = plugin;
- api->send = &dv_plugin_send;
- api->disconnect_peer = &dv_plugin_disconnect_peer;
- api->disconnect_session = &dv_plugin_disconnect_session;
- api->address_pretty_printer = &dv_plugin_address_pretty_printer;
- api->check_address = &dv_plugin_check_address;
- api->address_to_string = &dv_plugin_address_to_string;
- api->string_to_address = &dv_plugin_string_to_address;
- api->query_keepalive_factor = &dv_plugin_query_keepalive_factor;
- api->get_session = &dv_get_session;
- api->get_network = &dv_get_network;
- api->get_network_for_address = &dv_plugin_get_network_for_address;
- api->update_session_timeout = &dv_plugin_update_session_timeout;
- api->setup_monitor = &dv_plugin_setup_monitor;
- return api;
-}
-
-
-/**
- * Function called to free a session.
- *
- * @param cls NULL
- * @param key unused
- * @param value session to free
- * @return #GNUNET_OK (continue to iterate)
- */
-static int
-free_session_iterator (void *cls,
- const struct GNUNET_PeerIdentity *key,
- void *value)
-{
- struct GNUNET_ATS_Session *session = value;
-
- free_session (session);
- return GNUNET_OK;
-}
-
-
-/**
- * Exit point from the plugin.
- *
- * @param cls plugin API
- * @return NULL
- */
-void *
-libgnunet_plugin_transport_dv_done (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
- struct Plugin *plugin = api->cls;
-
- GNUNET_DV_service_disconnect (plugin->dvh);
- GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
- &free_session_iterator,
- NULL);
- GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
- GNUNET_SERVER_mst_destroy (plugin->mst);
- GNUNET_free (plugin);
- GNUNET_free (api);
- return NULL;
-}
-
-/* end of plugin_transport_dv.c */
projects / oweals / gnunet.git / commitdiff