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- /*
- This file is part of GNUnet.
- (C) 2013 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 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
- /**
- * Linked list of messages to send to clients.
- */
- struct PendingMessage
- {
- /**
- * Pointer to next item in the list
- */
- struct PendingMessage *next;
- /**
- * Pointer to previous item in the list
- */
- struct PendingMessage *prev;
- /**
- * Actual message to be sent, allocated after this struct.
- */
- const struct GNUNET_MessageHeader *msg;
- /**
- * Next target for the message (a neighbour of ours).
- */
- struct GNUNET_PeerIdentity next_target;
- /**
- * Unique ID of the message.
- */
- uint32_t uid;
- };
- /**
- * 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;
- /**
- * Head of linked list of messages to send to this peer.
- */
- struct PendingMessage *pm_head;
- /**
- * Tail of linked list of messages to send to this peer.
- */
- struct PendingMessage *pm_tail;
- /**
- * Transmit handle to core service.
- */
- struct GNUNET_CORE_TransmitHandle *cth;
- /**
- * 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.
- */
- GNUNET_SCHEDULER_TaskIdentifier 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;
- /**
- * Number of messages currently in the 'pm_XXXX'-DLL.
- */
- unsigned int pm_queue_size;
- /**
- * 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_ATS_Network_Type 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_SERVER_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 GNUNET_SCHEDULER_TaskIdentifier 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
- * @param tc scheduler context
- */
- static void
- initiate_set_union (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
- /**
- * 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_SERVER_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;
- memcpy (&received_msg[1], message, ntohs (message->size));
- GNUNET_SERVER_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_SERVER_notification_context_broadcast (nc,
- message,
- GNUNET_NO);
- }
- /**
- * Give an (N)ACK message to the plugin, we transmitted a message for it.
- *
- * @param target peer that received the message
- * @param uid plugin-chosen UID for the message
- * @param nack #GNUNET_NO to send ACK, #GNUNET_YES to send NACK
- */
- static void
- send_ack_to_plugin (const struct GNUNET_PeerIdentity *target,
- uint32_t uid,
- int nack)
- {
- struct GNUNET_DV_AckMessage ack_msg;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Delivering ACK for message to peer `%s'\n",
- GNUNET_i2s (target));
- ack_msg.header.size = htons (sizeof (ack_msg));
- ack_msg.header.type = htons ((GNUNET_YES == nack)
- ? GNUNET_MESSAGE_TYPE_DV_SEND_NACK
- : GNUNET_MESSAGE_TYPE_DV_SEND_ACK);
- ack_msg.uid = htonl (uid);
- ack_msg.target = *target;
- send_control_to_plugin (&ack_msg.header);
- }
- /**
- * 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_ATS_Network_Type network)
- {
- struct GNUNET_DV_DistanceUpdateMessage du_msg;
- GNUNET_break (GNUNET_ATS_NET_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_ATS_Network_Type 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);
- }
- /**
- * Function called to transfer a message to another peer
- * via core.
- *
- * @param cls closure with the direct neighbor
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
- static size_t
- core_transmit_notify (void *cls, size_t size, void *buf)
- {
- struct DirectNeighbor *dn = cls;
- char *cbuf = buf;
- struct PendingMessage *pending;
- size_t off;
- size_t msize;
- dn->cth = NULL;
- if (NULL == buf)
- {
- /* client disconnected */
- return 0;
- }
- off = 0;
- while ( (NULL != (pending = dn->pm_head)) &&
- (size >= off + (msize = ntohs (pending->msg->size))))
- {
- dn->pm_queue_size--;
- GNUNET_CONTAINER_DLL_remove (dn->pm_head,
- dn->pm_tail,
- pending);
- memcpy (&cbuf[off], pending->msg, msize);
- if (0 != pending->uid)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Acking transmission of %u bytes to %s with plugin\n",
- msize,
- GNUNET_i2s (&pending->next_target));
- send_ack_to_plugin (&pending->next_target,
- pending->uid,
- GNUNET_NO);
- }
- GNUNET_free (pending);
- off += msize;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting total of %u bytes to %s\n",
- off,
- GNUNET_i2s (&dn->peer));
- GNUNET_assert (NULL != core_api);
- if (NULL != dn->pm_head)
- dn->cth =
- GNUNET_CORE_notify_transmit_ready (core_api,
- GNUNET_YES /* cork */,
- GNUNET_CORE_PRIO_BEST_EFFORT,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &dn->peer,
- msize,
- &core_transmit_notify, dn);
- return off;
- }
- /**
- * Forward the given payload to the given target.
- *
- * @param target where to send the message
- * @param distance distance to the @a sender
- * @param uid unique ID for the message
- * @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,
- uint32_t uid,
- const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_PeerIdentity *actual_target,
- const struct GNUNET_MessageHeader *payload)
- {
- struct PendingMessage *pm;
- struct RouteMessage *rm;
- size_t msize;
- if ( (target->pm_queue_size >= MAX_QUEUE_SIZE) &&
- (0 == uid) &&
- (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;
- }
- msize = sizeof (struct RouteMessage) + ntohs (payload->size);
- if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
- pm->next_target = target->peer;
- pm->uid = uid;
- pm->msg = (const struct GNUNET_MessageHeader *) &pm[1];
- rm = (struct RouteMessage *) &pm[1];
- rm->header.size = htons ((uint16_t) msize);
- rm->header.type = htons (GNUNET_MESSAGE_TYPE_DV_ROUTE);
- rm->distance = htonl (distance);
- rm->target = *actual_target;
- rm->sender = *sender;
- memcpy (&rm[1], payload, ntohs (payload->size));
- GNUNET_CONTAINER_DLL_insert_tail (target->pm_head,
- target->pm_tail,
- pm);
- target->pm_queue_size++;
- GNUNET_assert (NULL != core_api);
- if (NULL == target->cth)
- target->cth = GNUNET_CORE_notify_transmit_ready (core_api,
- GNUNET_YES /* cork */,
- GNUNET_CORE_PRIO_BEST_EFFORT,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &target->peer,
- msize,
- &core_transmit_notify, target);
- }
- /**
- * 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 (neighbor->peer))) )
- {
- /* 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
- */
- static void
- handle_core_connect (void *cls,
- const struct GNUNET_PeerIdentity *peer)
- {
- struct DirectNeighbor *neighbor;
- /* Check for connect to self message */
- if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
- return;
- /* check if entry exists */
- neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- peer);
- if (NULL != neighbor)
- {
- GNUNET_break (GNUNET_ATS_NET_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;
- handle_direct_connect (neighbor);
- return;
- }
- 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,
- peer,
- neighbor,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- neighbor->connected = GNUNET_YES;
- neighbor->distance = 0; /* unknown */
- neighbor->network = GNUNET_ATS_NET_UNSPECIFIED;
- }
- /**
- * 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
- * @param tc unused
- */
- static void
- refresh_routes_task (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- rr_task = GNUNET_SCHEDULER_NO_TASK;
- 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 (GNUNET_SCHEDULER_NO_TASK == rr_task)
- rr_task = GNUNET_SCHEDULER_add_now (&refresh_routes_task,
- NULL);
- }
- /**
- * Get distance information from 'atsi'.
- *
- * @param atsi performance data
- * @param atsi_count number of entries in atsi
- * @return connected transport distance
- */
- static uint32_t
- get_atsi_distance (const struct GNUNET_ATS_Information *atsi,
- uint32_t atsi_count)
- {
- uint32_t i;
- for (i = 0; i < atsi_count; i++)
- if (ntohl (atsi[i].type) == GNUNET_ATS_QUALITY_NET_DISTANCE)
- return (0 == ntohl (atsi[i].value)) ? DIRECT_NEIGHBOR_COST : ntohl (atsi[i].value); // FIXME: 0 check should not be required once ATS is fixed!
- /* If we do not have explicit distance data, assume direct neighbor. */
- return DIRECT_NEIGHBOR_COST;
- }
- /**
- * Get network information from 'atsi'.
- *
- * @param atsi performance data
- * @param atsi_count number of entries in atsi
- * @return connected transport network
- */
- static enum GNUNET_ATS_Network_Type
- get_atsi_network (const struct GNUNET_ATS_Information *atsi,
- uint32_t atsi_count)
- {
- uint32_t i;
- for (i = 0; i < atsi_count; i++)
- if (ntohl (atsi[i].type) == GNUNET_ATS_NETWORK_TYPE)
- return (enum GNUNET_ATS_Network_Type) ntohl (atsi[i].value);
- return GNUNET_ATS_NET_UNSPECIFIED;
- }
- /**
- * 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->cth)
- {
- GNUNET_CORE_notify_transmit_ready_cancel (neighbor->cth);
- neighbor->cth = NULL;
- }
- 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 (GNUNET_SCHEDULER_NO_TASK != neighbor->initiate_task)
- {
- GNUNET_SCHEDULER_cancel (neighbor->initiate_task);
- neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
- }
- }
- /**
- * 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 ats performance data for the address (as far as known)
- * @param ats_count number of performance records in @a ats
- */
- 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_Information *ats,
- uint32_t ats_count)
- {
- struct DirectNeighbor *neighbor;
- uint32_t distance;
- enum GNUNET_ATS_Network_Type network = GNUNET_ATS_NET_UNSPECIFIED;
- if (NULL == address)
- {
- /* ATS service temporarily disconnected */
- return;
- }
- if (GNUNET_YES != active)
- {
- // FIXME: handle disconnect/inactive case too!
- return;
- }
- distance = get_atsi_distance (ats, ats_count);
- network = get_atsi_network (ats, ats_count);
- GNUNET_break (GNUNET_ATS_NET_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,
- &address->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 status see `enum GNUNET_SET_Status`
- */
- static void
- handle_set_union_result (void *cls,
- const struct GNUNET_SET_Element *element,
- enum GNUNET_SET_Status status)
- {
- struct DirectNeighbor *neighbor = cls;
- struct DirectNeighbor *dn;
- struct Target *target;
- 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;
- }
- if ( (NULL != (dn = GNUNET_CONTAINER_multipeermap_get (direct_neighbors, &((struct Target *) element->data)->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);
- 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,
- &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
- * @param tc scheduler context
- */
- static void
- initiate_set_union (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct DirectNeighbor *neighbor = cls;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Initiating SET union with peer `%s'\n",
- GNUNET_i2s (&neighbor->peer));
- neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
- 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,
- &handle_set_union_result,
- neighbor);
- neighbor->consensus_insertion_offset = 0;
- neighbor->consensus_insertion_distance = 0;
- neighbor->consensus_elements = 0;
- build_set (neighbor);
- }
- /**
- * 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 peer peer which sent the message (immediate sender)
- * @param message the message
- * @return #GNUNET_OK on success, #GNUNET_SYSERR if the other peer violated the protocol
- */
- static int
- handle_dv_route_message (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
- {
- const struct RouteMessage *rm;
- const struct GNUNET_MessageHeader *payload;
- struct Route *route;
- struct DirectNeighbor *neighbor;
- struct DirectNeighbor *dn;
- struct Target *target;
- uint32_t distance;
- char me[5];
- char src[5];
- char prev[5];
- char dst[5];
- if (ntohs (message->size) < sizeof (struct RouteMessage) + sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- rm = (const struct RouteMessage *) message;
- distance = ntohl (rm->distance);
- payload = (const struct GNUNET_MessageHeader *) &rm[1];
- if (ntohs (message->size) != sizeof (struct RouteMessage) + ntohs (payload->size))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- strncpy (prev, GNUNET_i2s (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",
- ntohs (message->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 GNUNET_OK;
- }
- /* 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! */
- neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- peer);
- if (NULL == neighbor)
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- 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 GNUNET_OK;
- }
- 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 GNUNET_OK;
- }
- 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);
- neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- peer);
- if (NULL == neighbor)
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- 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 GNUNET_OK;
- }
- add_new_route (target, neighbor);
- }
- route = GNUNET_CONTAINER_multipeermap_get (all_routes,
- &rm->target);
- if (NULL == route)
- {
- neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
- &rm->target);
- if (NULL == neighbor)
- {
- 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 GNUNET_OK;
- }
- }
- else
- {
- neighbor = route->next_hop;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding message to %s\n",
- GNUNET_i2s (&neighbor->peer));
- forward_payload (neighbor,
- distance + 1,
- 0,
- &rm->sender,
- &rm->target,
- payload);
- return GNUNET_OK;
- }
- /**
- * Service server's handler for message send requests (which come
- * bubbling up to us through the DV plugin).
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
- static void
- handle_dv_send_message (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- struct Route *route;
- const struct GNUNET_DV_SendMessage *msg;
- const struct GNUNET_MessageHeader *payload;
- if (ntohs (message->size) < sizeof (struct GNUNET_DV_SendMessage) + sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- msg = (const struct GNUNET_DV_SendMessage *) message;
- GNUNET_break (0 != ntohl (msg->uid));
- payload = (const struct GNUNET_MessageHeader *) &msg[1];
- if (ntohs (message->size) != sizeof (struct GNUNET_DV_SendMessage) + ntohs (payload->size))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- 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);
- send_ack_to_plugin (&msg->target, ntohl (msg->uid), GNUNET_YES);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- 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 */,
- htonl (msg->uid),
- &my_identity,
- &msg->target,
- payload);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- }
- /**
- * Cleanup all of the data structures associated with a given neighbor.
- *
- * @param neighbor neighbor to clean up
- */
- static void
- cleanup_neighbor (struct DirectNeighbor *neighbor)
- {
- struct PendingMessage *pending;
- while (NULL != (pending = neighbor->pm_head))
- {
- neighbor->pm_queue_size--;
- GNUNET_CONTAINER_DLL_remove (neighbor->pm_head,
- neighbor->pm_tail,
- pending);
- GNUNET_free (pending);
- }
- 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
- */
- static void
- handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
- {
- struct DirectNeighbor *neighbor;
- 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 (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
- return;
- neighbor =
- GNUNET_CONTAINER_multipeermap_get (direct_neighbors, peer);
- if (NULL == neighbor)
- {
- GNUNET_break (0);
- 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
- * @param tc unused
- */
- static void
- shutdown_task (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- 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_SERVER_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 (GNUNET_SCHEDULER_NO_TASK != rr_task)
- {
- GNUNET_SCHEDULER_cancel (rr_task);
- rr_task = GNUNET_SCHEDULER_NO_TASK;
- }
- }
- /**
- * Notify newly connected client about an existing route.
- *
- * @param cls the `struct GNUNET_SERVER_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_SERVER_Client *client = cls;
- struct Route *route = value;
- struct GNUNET_DV_ConnectMessage cm;
- memset (&cm, 0, sizeof (cm));
- cm.header.size = htons (sizeof (cm));
- cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
- cm.distance = htonl (route->target.distance);
- cm.peer = route->target.peer;
- GNUNET_SERVER_notification_context_unicast (nc,
- client,
- &cm.header,
- GNUNET_NO);
- 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, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- GNUNET_SERVER_notification_context_add (nc, client);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- 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 server the initialized server
- * @param c configuration to use
- */
- static void
- run (void *cls, struct GNUNET_SERVER_Handle *server,
- const struct GNUNET_CONFIGURATION_Handle *c)
- {
- static struct GNUNET_CORE_MessageHandler core_handlers[] = {
- {&handle_dv_route_message, GNUNET_MESSAGE_TYPE_DV_ROUTE, 0},
- {NULL, 0, 0}
- };
- static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
- {&handle_start, NULL,
- GNUNET_MESSAGE_TYPE_DV_START,
- sizeof (struct GNUNET_MessageHeader) },
- { &handle_dv_send_message, NULL,
- GNUNET_MESSAGE_TYPE_DV_SEND,
- 0},
- {NULL, NULL, 0, 0}
- };
- 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,
- NULL, GNUNET_NO,
- NULL, GNUNET_NO,
- 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_SERVER_notification_context_create (server,
- MAX_QUEUE_SIZE_PLUGIN);
- stats = GNUNET_STATISTICS_create ("dv", cfg);
- GNUNET_SERVER_add_handlers (server, plugin_handlers);
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
- &shutdown_task, NULL);
- }
- /**
- * The main function for the dv service.
- *
- * @param argc number of arguments from the command line
- * @param argv command line arguments
- * @return 0 ok, 1 on error
- */
- int
- main (int argc, char *const *argv)
- {
- return (GNUNET_OK ==
- GNUNET_SERVICE_run (argc, argv, "dv", GNUNET_SERVICE_OPTION_NONE,
- &run, NULL)) ? 0 : 1;
- }
- /* end of gnunet-service-dv.c */
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