/*
This file is part of GNUnet.
- (C) 2009-2013 Christian Grothoff (and other contributing authors)
+ (C) 2009-2014 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
#include "gnunet_hello_lib.h"
#include "gnunet_constants.h"
#include "gnunet_protocols.h"
-#include "gnunet_nse_service.h"
#include "gnunet_ats_service.h"
#include "gnunet_core_service.h"
#include "gnunet_datacache_lib.h"
#include "gnunet_transport_service.h"
-#include "gnunet_hello_lib.h"
#include "gnunet_dht_service.h"
#include "gnunet_statistics_service.h"
#include "gnunet-service-xdht.h"
#include "gnunet-service-xdht_clients.h"
#include "gnunet-service-xdht_datacache.h"
-#include "gnunet-service-xdht_hello.h"
#include "gnunet-service-xdht_neighbours.h"
-#include "gnunet-service-xdht_nse.h"
#include "gnunet-service-xdht_routing.h"
#include <fenv.h>
#include "dht.h"
+/**
+ * Maximum possible fingers (including predecessor) of a peer
+ */
+#define MAX_FINGERS 65
+
+/**
+ * Maximum allowed number of pending messages per friend peer.
+ */
+#define MAXIMUM_PENDING_PER_FRIEND 64
+
+/**
+ * How long to wait before sending another find finger trail request
+ */
+#define DHT_FIND_FINGER_TRAIL_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
-/* FIXME:
- 1. Add content and route replication later.
- *2. Algorithm to shorten the trail length - one possible solution could be
- * when we are in trail seutp result part. each peer in the trail check if any of
- * the corresponding peers is its friend list. Then it can shortcut the path.
- * But this will have O(n) run time at each peer, where n = trail_length.\
- * or rather O(n)+O(n-1)+..O(1) =O(n).
- * 4. As we start looking for finger from i = 0, using this parameter to
- * generate random value does not look smart in send_find_finger_trail_message.
- * 6. Need to add a new task, fix fingers. For node join/leave, we need to
- * upgrade our finger table periodically. So, we should call fix_fingers
- * and change our finger table.
- * 7. Should we look for fingers one by one in send_find_finger_trail_setup
- * 8. Change the message is gnunet_protocols.h
+/**
+ * How long at most to wait for transmission of a request to another peer?
*/
+#define GET_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
+/**
+ * Duration for which I may remain congested.
+ * Note: Its a static value. In future, a peer may do some analysis and calculate
+ * congestion_timeout based on 'some' parameters.
+ */
+#define CONGESTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
/**
- * Maximum possible fingers of a peer.
- * FIXME: Should it be 64 as we are doing all the operation on 64 bit numbers now?
+ * Maximum number of trails allowed to go through a friend.
*/
-#define MAX_FINGERS 64
+#define TRAILS_THROUGH_FRIEND_THRESHOLD 64
/**
- * Maximum allowed number of pending messages per friend peer.
+ * Maximum number of trails stored per finger.
*/
-#define MAXIMUM_PENDING_PER_FRIEND 64
+#define MAXIMUM_TRAILS_PER_FINGER 2
/**
- * How long at least to wait before sending another find finger trail request.
+ * Finger map index for predecessor entry in finger peermap.
*/
-#define DHT_MINIMUM_FIND_FINGER_TRAIL_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 30)
+#define PREDECESSOR_FINGER_ID 64
/**
- * How long at most to wait before sending another find finger trail request.
+ * Wrap around in peer identity circle.
+ * FIXME: not used anywhere, should be used in
+ * find_successor() while comparing two peers.
*/
-#define DHT_MAXIMUM_FIND_FINGER_TRAIL_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 10)
+#define PEER_IDENTITES_WRAP_AROUND pow(2, 64) - 1
/**
- * FIXME: Currently used in GDS_NEIGHBOURS_handle_trail_setup.
- * I have just copied it from gnunet-service-dht_neighbours. Will it work here?
- * How long at most to wait for transmission of a GET request to another peer?
+ * To check if a finger is predecessor or not.
*/
-#define GET_TIMEOUT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 2)
+enum GDS_NEIGHBOURS_finger_type
+{
+ GDS_FINGER_TYPE_PREDECESSOR = 0,
+ GDS_FINGER_TYPE_NON_PREDECESSOR = 1
+};
GNUNET_NETWORK_STRUCT_BEGIN
-/* FIXME:
- * 1) Bloomfilter is not required for X-Vine.
- * Keep the field now but remove it when implementing PUT/GET.
- * 2) also, check the field of put/get/result if all are required for
- * x-vine or not. */
-
/**
* P2P PUT message
*/
/**
* Content type.
*/
- uint32_t type GNUNET_PACKED;
+ uint32_t block_type GNUNET_PACKED;
/**
* Hop count
/**
* Replication level for this message
+ * In the current implementation, this value is not used.
*/
uint32_t desired_replication_level GNUNET_PACKED;
* Length of the PUT path that follows (if tracked).
*/
uint32_t put_path_length GNUNET_PACKED;
-
+
+ /**
+ * Best known destination (could be my friend or finger) which should
+ * get this message next.
+ */
+ struct GNUNET_PeerIdentity best_known_destination;
+
+ /**
+ * In case best_known_destination is a finger, then trail to reach
+ * to that finger. Else its default value is 0.
+ */
+ struct GNUNET_HashCode intermediate_trail_id;
+
/**
* When does the content expire?
*/
struct GNUNET_TIME_AbsoluteNBO expiration_time;
+
+ /**
+ * The key to store the value under.
+ */
+ struct GNUNET_HashCode key GNUNET_PACKED;
+
+ /* put path (if tracked) */
+ /* Payload */
+
+};
+
+/**
+ * P2P GET message
+ */
+struct PeerGetMessage
+{
+ /**
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_GET
+ */
+ struct GNUNET_MessageHeader header;
+
/**
- * Bloomfilter (for peer identities) to stop circular routes
+ * Processing options
*/
- char bloomfilter[DHT_BLOOM_SIZE];
+ uint32_t options GNUNET_PACKED;
/**
- * The key we are storing under.
+ * Desired content type.
+ */
+ uint32_t block_type GNUNET_PACKED;
+
+ /**
+ * Hop count
+ */
+ uint32_t hop_count GNUNET_PACKED;
+
+ /**
+ * Desired replication level for this request.
+ * In the current implementation, this value is not used.
+ */
+ uint32_t desired_replication_level GNUNET_PACKED;
+
+ /**
+ * Total number of peers in get path.
+ */
+ unsigned int get_path_length;
+
+ /**
+ * Best known destination (could be my friend or finger) which should
+ * get this message next.
+ */
+ struct GNUNET_PeerIdentity best_known_destination;
+
+ /**
+ * In case best_known_destination is a finger, then trail to reach
+ * to that finger. Else its default value is 0.
+ */
+ struct GNUNET_HashCode intermediate_trail_id;
+
+ /**
+ * The key we are looking for.
*/
struct GNUNET_HashCode key;
-
- /* put path (if tracked) */
-
- /* Payload */
+
+ /* Get path. */
};
-
/**
* P2P Result message
*/
-struct PeerResultMessage
+struct PeerGetResultMessage
{
/**
- * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_RESULT
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_GET_RESULT
*/
struct GNUNET_MessageHeader header;
/**
- * Content type.
+ * The type for the data.
*/
uint32_t type GNUNET_PACKED;
-
+
/**
- * Length of the PUT path that follows (if tracked).
+ * Number of peers recorded in the outgoing path from source to the
+ * stored location of this message.
*/
uint32_t put_path_length GNUNET_PACKED;
-
+
/**
* Length of the GET path that follows (if tracked).
*/
uint32_t get_path_length GNUNET_PACKED;
-
+
+ /**
+ * Peer which queried for get and should get the result.
+ */
+ struct GNUNET_PeerIdentity querying_peer;
+
/**
* When does the content expire?
*/
- struct GNUNET_TIME_AbsoluteNBO expiration_time;
+ struct GNUNET_TIME_Absolute expiration_time;
/**
* The key of the corresponding GET request.
*/
struct GNUNET_HashCode key;
-
+
/* put path (if tracked) */
/* get path (if tracked) */
};
-
/**
- * P2P GET message
+ * P2P Trail setup message
*/
-struct PeerGetMessage
+struct PeerTrailSetupMessage
{
/**
- * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_GET
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP
*/
struct GNUNET_MessageHeader header;
-
- /**
- * Processing options
- */
- uint32_t options GNUNET_PACKED;
-
+
/**
- * Desired content type.
+ * Is source_peer trying to setup the trail to any finger or predecessor.
*/
- uint32_t type GNUNET_PACKED;
-
+ uint32_t is_predecessor;
+
/**
- * Hop count
+ * Peer closest to this value will be our finger.
*/
- uint32_t hop_count GNUNET_PACKED;
+ uint64_t ultimate_destination_finger_value;
/**
- * Desired replication level for this request.
+ * Source peer which wants to setup the trail to one of its finger.
*/
- uint32_t desired_replication_level GNUNET_PACKED;
+ struct GNUNET_PeerIdentity source_peer;
/**
- * Size of the extended query.
+ * Best known destination (could be my friend or finger) which should
+ * get this message next.
*/
- uint32_t xquery_size;
+ struct GNUNET_PeerIdentity best_known_destination;
/**
- * Bloomfilter mutator.
+ * Trail id of any intermediate trail we may encounter while doing trail setup.
*/
- uint32_t bf_mutator;
-
+ struct GNUNET_HashCode intermediate_trail_id;
+
/**
- * Bloomfilter (for peer identities) to stop circular routes
+ * Trail id for trail which we are trying to setup.
*/
- char bloomfilter[DHT_BLOOM_SIZE];
+ struct GNUNET_HashCode trail_id;
- /**
- * The key we are looking for.
+ /* List of peers which are part of trail setup so far.
+ * Trail does NOT include source_peer and peer which will be closest to
+ * ultimate_destination_finger_value.
+ * struct GNUNET_PeerIdentity trail_list[]
*/
- struct GNUNET_HashCode key;
-
};
-
/**
- * A destination can be either a friend or finger.
+ * P2P Trail Setup Result message
*/
-enum current_destination_type
+struct PeerTrailSetupResultMessage
{
- /* Friend */
- FRIEND ,
-
- /* Finger */
- FINGER ,
- /* My own identity */
- MY_ID
-};
-
-/**
- * P2P Trail setup message
- * TODO: Take reference from put_path and get_path to understand how to use size of trail list.
- */
-struct PeerTrailSetupMessage
-{
/**
- * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP_RESULT
*/
struct GNUNET_MessageHeader header;
/**
- * Source peer which wants to find trail to one of its finger.
+ * Finger to which we have found the path.
*/
- struct GNUNET_PeerIdentity source_peer;
-
- /**
- * As we are not sending any hello messages to this destination
- * finger, we are only searching for it, we can just send 64 bit.
- * Finger id to which we want to set up the trail to.
- *
- struct GNUNET_PeerIdentity destination_finger; */
+ struct GNUNET_PeerIdentity finger_identity;
/**
- * Finger id to which we want to set up the trail to.
+ * Peer which started trail_setup to find trail to finger_identity
*/
- uint64_t destination_finger;
-
+ struct GNUNET_PeerIdentity querying_peer;
+
/**
- * If set to 1, then we are looking for trail to our immediate successor.
+ * Is the trail setup to querying_peer's predecessor or finger?
*/
- unsigned int successor_flag;
-
+ uint32_t is_predecessor;
+
/**
- * If the message is forwarded to finger or friend.
+ * Value to which finger_identity is the closest peer.
*/
- enum current_destination_type current_destination_type;
+ uint64_t ulitmate_destination_finger_value;
/**
- * This field contains the peer to which this packet is forwarded.
+ * Identifier of the trail from querying peer to finger_identity, NOT
+ * including both endpoints.
*/
- struct GNUNET_PeerIdentity current_destination;
-
- /**
- * Number of entries in trail list.
- * FIXME: Is this data type correct?
- * FIMXE: Is usage of GNUNET_PACKED correct?
+ struct GNUNET_HashCode trail_id;
+
+ /* List of peers which are part of the trail from querying peer to
+ * finger_identity, NOT including both endpoints.
+ * struct GNUNET_PeerIdentity trail[]
*/
- uint32_t trail_length GNUNET_PACKED;
-
- /* FIXME: Add this field later.
- * The finger index in finger map.
- unsigned int finger_index;*/
-
};
/**
- *
+ * P2P Verify Successor Message.
*/
-struct PeerVerifySuccessor
+struct PeerVerifySuccessorMessage
{
-
-};
+ /**
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_VERIFY_SUCCESSOR
+ */
+ struct GNUNET_MessageHeader header;
+ /**
+ * Peer which wants to verify its successor.
+ */
+ struct GNUNET_PeerIdentity source_peer;
-/**
- *
- */
-struct PeerVerifySuccessorResult
-{
-
-};
+ /**
+ * Source Peer's current successor.
+ */
+ struct GNUNET_PeerIdentity successor;
-/**
- *
- */
-struct PeerNotifyNewSuccessor
-{
-
+ /**
+ * Identifier of trail to reach from source_peer to successor.
+ */
+ struct GNUNET_HashCode trail_id;
+
+ /* List of the peers which are part of trail to reach from source_peer
+ * to successor, NOT including them
+ * struct GNUNET_PeerIdentity trail[]
+ */
};
+
/**
- * P2P Trail setup Result message
+ * FIXME: In case you append the trail it may contain the same peer twice.
+ * So, when you call search_my_index it can return error. Solution is while
+ * appending the entry first check for duplicate entries or may be don't
+ * send the current_predecessor at all.
+ * P2P Verify Successor Result Message
*/
-struct PeerTrailSetupResultMessage
+struct PeerVerifySuccessorResultMessage
{
/**
- * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_RESULT_SETUP
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_VERIFY_SUCCESSOR_RESULT
*/
struct GNUNET_MessageHeader header;
-
+
/**
- * Finger to which we have found the path.
+ * Peer which sent the request to verify its successor.
*/
- struct GNUNET_PeerIdentity finger;
+ struct GNUNET_PeerIdentity querying_peer;
/**
- * Peer which was looking for the trail to finger.
+ * Successor to which PeerVerifySuccessorMessage was sent.
*/
- struct GNUNET_PeerIdentity destination_peer;
+ struct GNUNET_PeerIdentity source_successor;
/**
- * This field contains the peer to which this packet is forwarded.
+ * Current Predecessor of source_successor. It can be same as querying peer
+ * or different.
*/
- struct GNUNET_PeerIdentity current_destination;
-
+ struct GNUNET_PeerIdentity current_predecessor;
+
/**
- * FIXME: Temporary field used to remember at which index we should read
- * to get our next peer.
+ * Trail identifier of trail from querying_peer to source_successor.
*/
- unsigned int current_index;
-
+ struct GNUNET_HashCode trail_id;
+
/**
- * If set to 1, then this trail is the trail to succcessor of our finger.
+ * Direction in which we are looking at the trail.
*/
- unsigned int successor_flag;
-
- /**
- * Number of entries in trail list.
- * FIXME: Is this data type correct?
- * FIXME: Is usage of GNUNET_PACKED correct?
+ uint32_t trail_direction;
+
+ /* In case current_predecessor != querying_peer, then trail to reach from
+ * querying_peer to current_predecessor, NOT including end points.
+ * struct GNUNET_PeerIdentity trail[]
*/
- uint32_t trail_length GNUNET_PACKED;
-
};
-GNUNET_NETWORK_STRUCT_END
-
-
/**
- * Linked list of messages to send to a particular other peer.
+ * P2P Notify New Successor Message.
*/
-struct P2PPendingMessage
+struct PeerNotifyNewSuccessorMessage
{
/**
- * Pointer to next item in the list
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_NOTIFY_NEW_SUCCESSOR
*/
- struct P2PPendingMessage *next;
+ struct GNUNET_MessageHeader header;
/**
- * Pointer to previous item in the list
+ * Peer which wants to notify its new successor.
*/
- struct P2PPendingMessage *prev;
+ struct GNUNET_PeerIdentity source_peer;
/**
- * When does this message time out?
+ * New successor of source_peer.
*/
- struct GNUNET_TIME_Absolute timeout;
+ struct GNUNET_PeerIdentity new_successor;
- /**
- * Message importance level. FIXME: used? useful?
+ /**
+ * Unique identifier of the trail from source_peer to new_successor,
+ * NOT including the endpoints.
*/
- unsigned int importance;
+ struct GNUNET_HashCode trail_id;
+
+ /* List of peers in trail from source_peer to new_successor,
+ * NOT including the endpoints.
+ * struct GNUNET_PeerIdentity trail[]
+ */
+};
+/**
+ * FIXME: Check if you can merge trail compression and trail teardown
+ * by modifying routing table structure a little bit. PRIORITY: at the end
+ * less code.
+ * P2P Trail Compression Message.
+ */
+struct PeerTrailCompressionMessage
+{
/**
- * Actual message to be sent, allocated at the end of the struct:
- * // msg = (cast) &pm[1];
- * // memcpy (&pm[1], data, len);
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_COMPRESSION
*/
- const struct GNUNET_MessageHeader *msg;
+ struct GNUNET_MessageHeader header;
-};
+ /**
+ * Source peer of this trail.
+ */
+ struct GNUNET_PeerIdentity source_peer;
+ /**
+ * Destination of this trail.
+ */
+ struct GNUNET_PeerIdentity destination_peer;
- /**
- * Linked List of peers which are part of trail to reach a particular Finger.
- */
-struct TrailPeerList
-{
- /**
- * Pointer to next item in the list
+ /**
+ * Trail from source_peer to destination_peer compressed such that
+ * new_first_friend is the first hop in the trail from source to
+ * destination.
*/
- struct TrailPeerList *next;
+ struct GNUNET_PeerIdentity new_first_friend;
- /**
- * Pointer to previous item in the list
+ /**
+ * Unique identifier of trail.
*/
- struct TrailPeerList *prev;
-
- /**
- * An element in this trail list
- */
- struct GNUNET_PeerIdentity peer;
-
+ struct GNUNET_HashCode trail_id;
};
/**
- * Entry in friend_peermap.
+ * P2P Trail Tear Down message.
*/
-struct FriendInfo
+struct PeerTrailTearDownMessage
{
/**
- * What is the identity of the peer?
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_TEARDOWN
*/
- struct GNUNET_PeerIdentity id;
+ struct GNUNET_MessageHeader header;
/**
- * Count of outstanding messages for peer.
+ * Source peer of the trail.
*/
- unsigned int pending_count;
-
+ struct GNUNET_PeerIdentity source_peer;
+
/**
- * Successor of this finger.
+ * Destination peer of the trail.
*/
- struct GNUNET_PeerIdentity successor_identity;
-
+ struct GNUNET_PeerIdentity destination_peer;
+
/**
- * Predecessor of this finger.
+ * Unique identifier of the trail.
*/
- struct GNUNET_PeerIdentity predecessor_identity;
-
+ struct GNUNET_HashCode TRAIL_ID;
+
/**
- * Head of pending messages to be sent to this peer.
+ * Direction of trail.
*/
- struct P2PPendingMessage *head;
-
- /**
- * Tail of pending messages to be sent to this peer.
- */
- struct P2PPendingMessage *tail;
-
- /**
- * TODO - How and where to use this?
- * Core handle for sending messages to this peer.
- */
- struct GNUNET_CORE_TransmitHandle *th;
-
+ uint32_t trail_direction;
};
/**
- * FIXME: As in chord , where we store the actual finger identity we were looking
- * for and the real id which we got as successor. If we want to store like that
- * then we will need to add a new field and search actual peer id.
- * FIXME: Should we use another PeerIdentity which is smaller
- * than 256 bits while storing.
- * SUPU
- * finger_identity is the actual finger that we were looking for.
- * successor is the peer id which is our finger in place of finger_identity
- * that we were actually looking for. It may happen that finger_identity
- * was not in the network and we found the successor closest to that
- * finger_identity.
- * Predcessor is needed in case of node join/fail.
- * Entry in finger_peermap.
+ * P2P Trail Rejection Message.
*/
-struct FingerInfo
+struct PeerTrailRejectionMessage
{
/**
- * Finger identity.
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_REJECTION
*/
- struct GNUNET_PeerIdentity finger_identity;
-
+ struct GNUNET_MessageHeader header;
+
/**
- * If 1, then this finger entry is first finger /successor of the peer.
+ * Peer which wants to set up the trail.
*/
- unsigned int successor;
+ struct GNUNET_PeerIdentity source_peer;
+
/**
- * List of peers in the trail.
+ * Peer which sent trail rejection message as it it congested.
*/
- const struct GNUNET_PeerIdentity *trail_peer_list;
-};
+ struct GNUNET_PeerIdentity congested_peer;
-/**
- * Task that sends FIND FINGER TRAIL requests.
- */
-static GNUNET_SCHEDULER_TaskIdentifier find_finger_trail_task;
+ /**
+ * Peer identity closest to this value will be finger of
+ * source_peer.
+ */
+ uint64_t ultimate_destination_finger_value;
+
+ /**
+ * Is source_peer trying to setup the trail to its predecessor or finger.
+ */
+ uint32_t is_predecessor;
+
+ /**
+ * Identifier for the trail that source peer is trying to setup.
+ */
+ struct GNUNET_HashCode trail_id;
+
+ /**
+ * Relative time for which congested_peer will remain congested.
+ */
+ struct GNUNET_TIME_Relative congestion_time;
+
+ /* Trail_list from source_peer to peer which sent the message for trail setup
+ * to congested peer. This trail does NOT include source_peer.
+ struct GNUNET_PeerIdnetity trail[]*/
+};
/**
- * FIXME: As we should check for our immediate successor
- * in case of node join/fail, the immediate successor will change.
- * Hence we define a process which will be scheduled in regular interval.
- * But you should schedule this process once you have found your successor.
- * so, in finger_table_add_entry, when finger_peermap is size 1 then start
- * this task, and periodically call it within it self like find_finger_trail_setup
- *
- * Task that periodically checks for the immediate successor.
+ * P2P Add Trail Message.
*/
-static GNUNET_SCHEDULER_TaskIdentifier verify_successor;
+struct PeerAddTrailMessage
+{
+ /**
+ * Type: #GNUNET_MESSAGE_TYPE_DHT_P2P_ADD_TRAIL
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Source of the routing trail.
+ */
+ struct GNUNET_PeerIdentity source_peer;
+
+ /**
+ * Destination of the routing trail.
+ */
+ struct GNUNET_PeerIdentity destination_peer;
+
+ /**
+ * Unique identifier of the trail from source_peer to destination_peer,
+ * NOT including the endpoints.
+ */
+ struct GNUNET_HashCode trail_id;
+
+ /* Trail from source peer to destination peer, NOT including them.
+ * struct GNUNET_PeerIdentity trail[]
+ */
+};
+
+GNUNET_NETWORK_STRUCT_END
/**
- * Identity of this peer.
+ * Linked list of messages to send to a particular other peer.
*/
-static struct GNUNET_PeerIdentity my_identity;
+struct P2PPendingMessage
+{
+ /**
+ * Pointer to next item in the list
+ */
+ struct P2PPendingMessage *next;
+
+ /**
+ * Pointer to previous item in the list
+ */
+ struct P2PPendingMessage *prev;
+
+ /**
+ * Message importance level. FIXME: used? useful?
+ */
+ unsigned int importance;
+
+ /**
+ * When does this message time out?
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Actual message to be sent, allocated at the end of the struct:
+ * // msg = (cast) &pm[1];
+ * // memcpy (&pm[1], data, len);
+ */
+ const struct GNUNET_MessageHeader *msg;
+
+};
+
+
+/**
+ * Entry in friend_peermap.
+ */
+struct FriendInfo
+{
+ /**
+ * Friend Identity
+ */
+ struct GNUNET_PeerIdentity id;
+
+ /**
+ * Number of trails for which this friend is the first hop or if the friend
+ * is finger.
+ */
+ unsigned int trails_count;
+
+ /**
+ * Count of outstanding messages for this friend.
+ */
+ unsigned int pending_count;
+
+ /**
+ * In case not 0, then amount of time for which this friend is congested.
+ */
+ struct GNUNET_TIME_Absolute congestion_timestamp;
+
+ /**
+ * Head of pending messages to be sent to this friend.
+ */
+ struct P2PPendingMessage *head;
+
+ /**
+ * Tail of pending messages to be sent to this friend.
+ */
+ struct P2PPendingMessage *tail;
+
+ /**
+ * Core handle for sending messages to this friend.
+ */
+ struct GNUNET_CORE_TransmitHandle *th;
+
+};
+
+/**
+ * An individual element of the trail to reach to a finger.
+ */
+struct Trail_Element
+{
+ /**
+ * Pointer to next item in the list
+ */
+ struct Trail_Element *next;
+
+ /**
+ * Pointer to prev item in the list
+ */
+ struct Trail_Element *prev;
+
+ /**
+ * An element in this trail.
+ */
+ struct GNUNET_PeerIdentity peer;
+};
+
+/**
+ * FIXME: removed first_friend_trails_count, need to write a function
+ * to calculate each time we need it. Else, keep a pointer to first
+ * friend of in the trail.
+ * Information about an individual trail.
+ */
+struct Trail
+{
+ /**
+ * Head of trail.
+ */
+ struct Trail_Element *trail_head;
+
+ /**
+ * Tail of trail.
+ */
+ struct Trail_Element *trail_tail;
+
+ /**
+ * Unique identifier of this trail.
+ */
+ struct GNUNET_HashCode trail_id;
+
+ /**
+ * Length of trail pointed
+ */
+ unsigned int trail_length;
+};
+
+/**
+ * An entry in finger_hashmap.
+ */
+struct FingerInfo
+{
+ /**
+ * Finger identity.
+ */
+ struct GNUNET_PeerIdentity finger_identity;
+
+ /**
+ * Index in finger peer map
+ */
+ uint32_t finger_map_index;
+
+ /**
+ * Number of trails setup so far for this finger.
+ * Should not cross MAXIMUM_TRAILS_PER_FINGER.
+ */
+ uint32_t trails_count;
+
+ /**
+ * Array of trails to reach to this finger.
+ */
+ struct Trail trail_list[MAXIMUM_TRAILS_PER_FINGER];
+};
+
+/**
+ * FIXME: Need to check if we need all the fields or not.
+ * Data structure to keep track of closest peer seen so far in find_successor()
+ */
+struct Closest_Peer
+{
+ /**
+ * 64 bit value of the peer
+ */
+ uint64_t value;
+
+ /**
+ * Trail id to reach to peer.
+ */
+ struct GNUNET_HashCode trail_id;
+
+ /**
+ * FIXME: see the usage of this field and write comment.
+ */
+ struct GNUNET_PeerIdentity next_hop;
+
+ /**
+ * Next destination. In case of friend and my_identity , it is same as next_hop
+ * In case of finger it is finger identity.
+ */
+ struct GNUNET_PeerIdentity best_known_destination;
+};
+
+/**
+ * FIXME: now I have removed the first_friend_trail_count,
+ * Need to update the code to find the count.
+ * Data structure to store the trail chosen to reach to finger.
+ */
+struct Selected_Finger_Trail
+{
+ /**
+ * First friend in the trail to reach finger.
+ */
+ struct FriendInfo friend;
+
+ /**
+ * Identifier of this trail.
+ */
+ struct GNUNET_HashCode trail_id;
+
+ /**
+ * Total number of peers in this trail.
+ */
+ unsigned int trail_length;
+};
+
+/**
+ * Task that sends FIND FINGER TRAIL requests. This task is started when we have
+ * get our first friend.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier find_finger_trail_task;
/**
- * FIXME: Not used anywhere in the code yet.
- * Hash of the identity of this peer.
+ * Identity of this peer.
*/
-static struct GNUNET_HashCode my_identity_hash;
+static struct GNUNET_PeerIdentity my_identity;
/**
- * Hash map of all the friends of a peer
+ * Peer map of all the friends of a peer
*/
static struct GNUNET_CONTAINER_MultiPeerMap *friend_peermap;
/**
* Hash map of all the fingers of a peer
*/
-static struct GNUNET_CONTAINER_MultiPeerMap *finger_peermap;
+static struct GNUNET_CONTAINER_MultiHashMap32 *finger_hashmap;
/**
- * TODO: Ask whats the use of ATS.
- * Handle to ATS.
- */
-static struct GNUNET_ATS_PerformanceHandle *atsAPI;
+ * FIXME: Check if you can replace finger_hashmap by an array of fingers.
+ * Array of all the fingers.
+ *
+static struct FingerInfo finger_table [MAX_FINGERS];*/
/**
* Handle to CORE.
static struct GNUNET_CORE_Handle *core_api;
/**
- * The current finger index that we have found trail to.
+ * The current finger index that we have want to find trail to. We start the
+ * search with value = 0, i.e. successor and then go to PREDCESSOR_FINGER_ID
+ * and decrement it. For any index 63 <= index < 0, if finger is same as successor,
+ * we reset this index to 0.
*/
-static unsigned int current_finger_index;
+static unsigned int current_search_finger_index;
/**
* Called when core is ready to send a message we asked for
* out to the destination.
*
- * @param cls the 'struct PeerInfo' of the target peer
+ * @param cls the 'struct FriendInfo' of the target friend
* @param size number of bytes available in buf
* @param buf where the callee should write the message
* @return number of bytes written to buf
struct P2PPendingMessage *pending;
size_t off;
size_t msize;
-
+
peer->th = NULL;
while ((NULL != (pending = peer->head)) &&
(0 == GNUNET_TIME_absolute_get_remaining (pending->timeout).rel_value_us))
{
peer->pending_count--;
- GNUNET_CONTAINER_DLL_remove (peer->head, peer->tail, pending);
+ GNUNET_CONTAINER_DLL_remove (peer->head, peer->tail, pending);
GNUNET_free (pending);
}
if (NULL == pending)
&core_transmit_notify, peer);
GNUNET_break (NULL != peer->th);
}
+
return off;
}
process_friend_queue (struct FriendInfo *peer)
{
struct P2PPendingMessage *pending;
-
+
if (NULL == (pending = peer->head))
return;
if (NULL != peer->th)
return;
-
+
GNUNET_STATISTICS_update (GDS_stats,
gettext_noop
("# Bytes of bandwidth requested from core"),
ntohs (pending->msg->size), GNUNET_NO);
-
- /* FIXME: Are we correctly initializing importance and pending. */
+
peer->th =
GNUNET_CORE_notify_transmit_ready (core_api, GNUNET_NO,
pending->importance,
/**
- * SUPU:
- * We add the next destination i.e. friend to which we are sending the packet
- * to our peer list in the calling function and we also increment trail_length
- * in calling function i.e. send_find_finger_trail and handle_dht_p2p_trail_setup.
- * Here we only copy the whole trail into our peer_list.
- * Setup the trail message and forward it to a friend.
- * @param source_peer Peer which wants to set up the trail to one of its finger.
- * @param destination_finger Peer to which we want to set up the trail to.
- * @param current_destination Current peer to which this message should be forwarded.
- * @param trail_length Numbers of peers in the trail.
- * @param trail_peer_list peers this request has traversed so far
- * @param successor_flag If 1 then we are looking for trail to our successor.
+ * Construct a trail setup message and forward it to target_friend
+ * @param source_peer Peer which wants to setup the trail
+ * @param ultimate_destination_finger_value Peer identity closest to this value
+ * will be finger to @a source_peer
+ * @param best_known_destination Best known destination (could be finger or friend)
+ * which should get this message.
+ * @param target_friend Friend to which message is forwarded now.
+ * @param trail_length Total number of peers in trail setup so far.
+ * @param trail_peer_list Trail setup so far
+ * @param is_predecessor Is source_peer looking for trail to a predecessor or not.
+ * @param trail_id Unique identifier for the trail we are trying to setup.
+ * @param intermediate_trail_id Trail id of intermediate trail to reach to
+ * best_known_destination when its a finger. If not
+ * used then set to 0.
*/
void
-GDS_NEIGHBOURS_handle_trail_setup(struct GNUNET_PeerIdentity *source_peer,
- uint64_t *destination_finger,
- struct FriendInfo *current_destination,
- unsigned int trail_length,
- struct GNUNET_PeerIdentity *trail_peer_list,
- unsigned int successor_flag)
+GDS_NEIGHBOURS_send_trail_setup (struct GNUNET_PeerIdentity source_peer,
+ uint64_t ultimate_destination_finger_value,
+ struct GNUNET_PeerIdentity best_known_destination,
+ struct FriendInfo *target_friend,
+ unsigned int trail_length,
+ const struct GNUNET_PeerIdentity *trail_peer_list,
+ unsigned int is_predecessor,
+ struct GNUNET_HashCode trail_id,
+ struct GNUNET_HashCode *intermediate_trail_id)
{
struct P2PPendingMessage *pending;
struct PeerTrailSetupMessage *tsm;
struct GNUNET_PeerIdentity *peer_list;
size_t msize;
-
- msize = sizeof(struct PeerTrailSetupMessage) +
- (trail_length * sizeof(struct GNUNET_PeerIdentity));
-
+
+ msize = sizeof (struct PeerTrailSetupMessage) +
+ (trail_length * sizeof (struct GNUNET_PeerIdentity));
+
if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
return;
}
-
- if (current_destination->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
- {
+
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1, GNUNET_NO);
}
-
- pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
- pending->importance = 0; /* FIXME */
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
- tsm = (struct PeerTrailSetupMessage *) &pending[1];
+ tsm = (struct PeerTrailSetupMessage *) &pending[1];
pending->msg = &tsm->header;
tsm->header.size = htons (msize);
tsm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP);
- memcpy(&(tsm->destination_finger), destination_finger, sizeof (uint64_t)); //FIXME: Is this copy correct?
- memcpy(&(tsm->source_peer), source_peer, sizeof (struct GNUNET_PeerIdentity));
- memcpy(&(tsm->current_destination),&(current_destination->id), sizeof (struct GNUNET_PeerIdentity));
- tsm->current_destination_type = htonl(FRIEND);
- tsm->trail_length = htonl(trail_length);
- if(successor_flag == 1)
- tsm->successor_flag = 1;
- peer_list = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) * trail_length);
- peer_list = (struct GNUNET_PeerIdentity *) &tsm[1];
- memcpy(peer_list, trail_peer_list, trail_length * sizeof(struct GNUNET_PeerIdentity));
-
- GNUNET_CONTAINER_DLL_insert_tail (current_destination->head, current_destination->tail, pending);
- current_destination->pending_count++;
- process_friend_queue (current_destination);
+ tsm->ultimate_destination_finger_value = GNUNET_htonll (ultimate_destination_finger_value);
+ tsm->source_peer = source_peer;
+ tsm->best_known_destination = best_known_destination;
+ tsm->is_predecessor = htonl (is_predecessor);
+ tsm->trail_id = trail_id;
+
+ if (NULL == intermediate_trail_id)
+ memset (&tsm->intermediate_trail_id, 0, sizeof (tsm->intermediate_trail_id));
+ else
+ tsm->intermediate_trail_id = *intermediate_trail_id;
+ if (trail_length > 0)
+ {
+ peer_list = (struct GNUNET_PeerIdentity *) &tsm[1];
+ memcpy (peer_list, trail_peer_list, trail_length * sizeof(struct GNUNET_PeerIdentity));
+ }
+
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
+
/**
- * Handle a tail setup result message.
- * @param destination_peer Peer which will get the trail to one of its finger.
- * @param source_finger Peer to which the trail has been setup to.
- * @param current_destination Current peer to which this message should be forwarded.
+ * Construct a trail setup result message and forward it to target friend.
+ * @param querying_peer Peer which sent the trail setup request and should get
+ * the result back.
+ * @param Finger Peer to which the trail has been setup to.
+ * @param target_friend Friend to which this message should be forwarded.
* @param trail_length Numbers of peers in the trail.
- * @param trail_peer_list peers this request has traversed so far
- * @param current_trail_index Index in trail_peer_list.
+ * @param trail_peer_list Peers which are part of the trail from q
+ * querying_peer to Finger, NOT including them.
+ * @param is_predecessor Is @a Finger predecessor to @a querying_peer
+ * @param ultimate_destination_finger_value Value to which @a finger is the closest
+ * peer.
+ * @param trail_id Unique identifier of the trail.
*/
void
-GDS_NEIGHBOURS_handle_trail_setup_result(struct GNUNET_PeerIdentity *destination_peer,
- struct GNUNET_PeerIdentity *source_finger,
- struct FriendInfo *current_destination,
- unsigned int trail_length,
- const struct GNUNET_PeerIdentity *trail_peer_list,
- unsigned int current_trial_index,
- unsigned int successor_flag)
+GDS_NEIGHBOURS_send_trail_setup_result (struct GNUNET_PeerIdentity querying_peer,
+ struct GNUNET_PeerIdentity finger,
+ struct FriendInfo *target_friend,
+ unsigned int trail_length,
+ const struct GNUNET_PeerIdentity *trail_peer_list,
+ unsigned int is_predecessor,
+ uint64_t ultimate_destination_finger_value,
+ struct GNUNET_HashCode trail_id)
{
struct P2PPendingMessage *pending;
struct PeerTrailSetupResultMessage *tsrm;
struct GNUNET_PeerIdentity *peer_list;
size_t msize;
-
- msize = sizeof(struct PeerTrailSetupMessage) +
- (trail_length * sizeof(struct GNUNET_PeerIdentity));
-
+
+ msize = sizeof (struct PeerTrailSetupResultMessage) +
+ (trail_length * sizeof (struct GNUNET_PeerIdentity));
+
if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
return;
}
-
- if (current_destination->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
- {
+
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
1, GNUNET_NO);
}
- pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
- pending->importance = 0; /* FIXME */
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0;
pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
- tsrm = (struct PeerTrailSetupResultMessage *) &pending[1];
+ tsrm = (struct PeerTrailSetupResultMessage *) &pending[1];
pending->msg = &tsrm->header;
tsrm->header.size = htons (msize);
tsrm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP_RESULT);
- memcpy(&(tsrm->current_destination), &(current_destination->id), sizeof(struct GNUNET_PeerIdentity));
- memcpy(&(tsrm->destination_peer), destination_peer, sizeof(struct GNUNET_PeerIdentity));
- memcpy(&(tsrm->finger), source_finger, sizeof(struct GNUNET_PeerIdentity));
- tsrm->trail_length = htonl(trail_length);
- tsrm->current_index = htonl(current_trial_index);
- tsrm->successor_flag = htonl(successor_flag);
+ tsrm->querying_peer = querying_peer;
+ tsrm->finger_identity = finger;
+ tsrm->is_predecessor = htonl (is_predecessor);
+ tsrm->trail_id = trail_id;
+ tsrm->ulitmate_destination_finger_value =
+ GNUNET_htonll (ultimate_destination_finger_value);
peer_list = (struct GNUNET_PeerIdentity *) &tsrm[1];
- memcpy(peer_list, trail_peer_list, trail_length * sizeof(struct GNUNET_PeerIdentity));
-
+ if (trail_length > 0)
+ {
+ memcpy (peer_list, trail_peer_list, trail_length * sizeof (struct GNUNET_PeerIdentity));
+ }
/* Send the message to chosen friend. */
- GNUNET_CONTAINER_DLL_insert_tail (current_destination->head, current_destination->tail, pending);
- current_destination->pending_count++;
- process_friend_queue (current_destination);
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
/**
- * This function is called from send_verify_successor_message funciton
- * and handle_dht_p2p_verify_successor.
- * Construct a PeerVerifySuccessor message and send it to friend.
+ * Send trail rejection message to next_hop
+ * @param source_peer Peer which is trying to setup the trail.
+ * @param ultimate_destination_finger_value Peer closest to this value will be
+ * @a source_peer's finger
+ * @param congested_peer Peer which sent this message as it is congested.
+ * @param is_predecessor Is source_peer looking for trail to a predecessor or not.
+ * @param trail_peer_list Trails seen so far in trail setup before getting rejected
+ * by congested_peer. This does not include @a source_peer
+ * @param trail_length Total number of peers in trail_peer_list, not including
+ * @a source_peer
+ * @param trail_id Unique identifier of this trail.
+ * @param congestion_timeout Duration given by congested peer as an estimate of
+ * how long it may remain congested.
*/
-void GDS_NEIGUBOURS_handle_verify_successor()
+void
+GDS_NEIGHBOURS_send_trail_rejection (struct GNUNET_PeerIdentity source_peer,
+ uint64_t ultimate_destination_finger_value,
+ struct GNUNET_PeerIdentity congested_peer,
+ unsigned int is_predecessor,
+ const struct GNUNET_PeerIdentity *trail_peer_list,
+ unsigned int trail_length,
+ struct GNUNET_HashCode trail_id,
+ struct FriendInfo *target_friend,
+ const struct GNUNET_TIME_Relative congestion_timeout)
{
- /* In this funciton, you receive
- 1. successor
- 2. trial to reach that successor
- 3. trail_length.
- 4. current trail index --> this gives the next_hop on whose pending queue you should
- add the message. */
-}
+ struct PeerTrailRejectionMessage *trm;
+ struct P2PPendingMessage *pending;
+ struct GNUNET_PeerIdentity *peer_list;
+ size_t msize;
+ msize = sizeof (struct PeerTrailRejectionMessage) +
+ (trail_length * sizeof (struct GNUNET_PeerIdentity));
-/**
- * this function will be called by destination successor.
- * Construct a PeerVerifySuccessorResult message and send it to friend.
- */
-void GDS_NEIGHBOURS_handle_verify_successor_result()
-{
- /* In this funciton, you receive
- 1. successor
- 2. trial to reach that successor
- 3. trail_length.
- 4. current trail index --> this gives the next_hop on whose pending queue you should
- add the message. */
-}
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
+ }
-/**
- * Construct a PeerNotifyNewSuccessor message and send it to friend.
- */
-void GDS_NEIGHBOURS_handle_notify_new_successor()
-{
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0;
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ trm = (struct PeerTrailRejectionMessage *)&pending[1];
+ pending->msg = &trm->header;
+ trm->header.size = htons (msize);
+ trm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_REJECTION);
+ trm->source_peer = source_peer;
+ trm->congested_peer = congested_peer;
+ trm->congestion_time = congestion_timeout;
+ trm->is_predecessor = htonl (is_predecessor);
+ trm->trail_id = trail_id;
+ trm->ultimate_destination_finger_value = GNUNET_htonll (ultimate_destination_finger_value);
+
+ peer_list = (struct GNUNET_PeerIdentity *) &trm[1];
+ if (trail_length > 0)
+ {
+ memcpy (peer_list, trail_peer_list, trail_length * sizeof (struct GNUNET_PeerIdentity));
+ }
+ /* Send the message to chosen friend. */
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
-/**FIXME: Old implementation just to remove error
- * TODO: Modify this function to handle our get request.
- * Perform a GET operation. Forwards the given request to other
- * peers. Does not lookup the key locally. May do nothing if this is
- * the only peer in the network (or if we are the closest peer in the
- * network).
- *
- * @param type type of the block
- * @param options routing options
- * @param desired_replication_level desired replication count
- * @param hop_count how many hops did this request traverse so far?
- * @param key key for the content
- * @param xquery extended query
- * @param xquery_size number of bytes in @a xquery
- * @param reply_bf bloomfilter to filter duplicates
- * @param reply_bf_mutator mutator for @a reply_bf
- * @param peer_bf filter for peers not to select (again)
+/**
+ * Construct a verify successor message and forward it to target_friend.
+ * @param source_peer Peer which wants to verify its successor.
+ * @param successor Peer which is @a source_peer's current successor.
+ * @param trail_id Unique Identifier of trail from @a source_peer to @a successor,
+ * NOT including them.
+ * @param trail List of peers which are part of trail to reach from @a source_peer
+ * to @a successor, NOT including them.
+ * @param trail_length Total number of peers in @a trail.
+ * @param target_friend Next friend to get this message.
*/
void
-GDS_NEIGHBOURS_handle_get (enum GNUNET_BLOCK_Type type,
- enum GNUNET_DHT_RouteOption options,
- uint32_t desired_replication_level,
- uint32_t hop_count, const struct GNUNET_HashCode * key,
- const void *xquery, size_t xquery_size,
- const struct GNUNET_CONTAINER_BloomFilter *reply_bf,
- uint32_t reply_bf_mutator,
- struct GNUNET_CONTAINER_BloomFilter *peer_bf)
-{
-
- /*
- 1. take the key, get the 64 bit value of the key.
- 2. call find_successor to get the successor of the key.
- 3. successor can be either a friend or finger.
- 4. update the field in get message to reflect if its a friend or finger table
- 5. add the put message to pending message and send it.
- */
-}
-
-/**FIXME: Old implementation just to remove error.
- * TODO: Modify this function to handle our put request.
- * Perform a PUT operation. Forwards the given request to other
- * peers. Does not store the data locally. Does not give the
- * data to local clients. May do nothing if this is the only
- * peer in the network (or if we are the closest peer in the
- * network).
- *
- * @param type type of the block
- * @param options routing options
- * @param desired_replication_level desired replication count
- * @param expiration_time when does the content expire
- * @param hop_count how many hops has this message traversed so far
- * @param bf Bloom filter of peers this PUT has already traversed
- * @param key key for the content
- * @param put_path_length number of entries in @a put_path
- * @param put_path peers this request has traversed so far (if tracked)
- * @param data payload to store
- * @param data_size number of bytes in @a data
- */
-void
-GDS_NEIGHBOURS_handle_put (enum GNUNET_BLOCK_Type type,
- enum GNUNET_DHT_RouteOption options,
- uint32_t desired_replication_level,
- struct GNUNET_TIME_Absolute expiration_time,
- uint32_t hop_count,
- struct GNUNET_CONTAINER_BloomFilter *bf,
- const struct GNUNET_HashCode *key,
- unsigned int put_path_length,
- struct GNUNET_PeerIdentity *put_path,
- const void *data, size_t data_size)
-{
-
- /*
- 1. take the key, get the 64 bit value of the key.
- 2. call find_successor to get the successor of the key.
- 3. successor can be either a friend or finger.
- 4. update the field in put message to reflect if its a friend or finger table
- 5. add the put message to pending message and send it.
- */
-}
+GDS_NEIGHBOURS_send_verify_successor_message (struct GNUNET_PeerIdentity source_peer,
+ struct GNUNET_PeerIdentity successor,
+ const struct GNUNET_HashCode trail_id,
+ struct GNUNET_PeerIdentity *trail,
+ unsigned int trail_length,
+ struct FriendInfo *target_friend)
+{
+ struct PeerVerifySuccessorMessage *vsm;
+ struct P2PPendingMessage *pending;
+ struct GNUNET_PeerIdentity *peer_list;
+ size_t msize;
+ msize = sizeof (struct PeerVerifySuccessorMessage);
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
-/**
- * FIXME: Check if this function actually iterates or not.
- * Randomly choose one of your friends from the friends_peer map
- * @return Friend
- */
-static struct FriendInfo *
-select_random_friend()
-{
- unsigned int current_size;
- unsigned int *index;
- unsigned int j = 0;
- struct GNUNET_CONTAINER_MultiPeerMapIterator *iter;
- struct GNUNET_PeerIdentity key_ret;
- struct FriendInfo *friend;
-
- current_size = GNUNET_CONTAINER_multipeermap_size(friend_peermap);
-
- /* Element stored at this index in friend_peermap should be selected friend. */
- index = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_WEAK, current_size);
-
- /* Create an iterator for friend_peermap. */
- iter = GNUNET_CONTAINER_multipeermap_iterator_create(friend_peermap);
-
- /* Set the position of iterator to index. */
- while(j < (*index))
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
{
- if(GNUNET_YES == GNUNET_CONTAINER_multipeermap_iterator_next(iter,NULL,NULL))
- {
- /* FIXME: I don't think we are actually incrementing iter. iter is always
- pointing to the same element. */
- j++;
- }
- else
- return NULL;
- }
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
+ }
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ vsm = (struct PeerVerifySuccessorMessage *) &pending[1];
+ pending->msg = &vsm->header;
+ vsm->header.size = htons (msize);
+ vsm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_VERIFY_SUCCESSOR);
+ vsm->source_peer = source_peer;
+ vsm->successor = successor;
+ vsm->trail_id = trail_id;
- if(GNUNET_YES == GNUNET_CONTAINER_multipeermap_iterator_next(iter,&key_ret,(const void **)&friend))
+ if (trail_length > 0)
{
- return friend;
+ peer_list = (struct GNUNET_PeerIdentity *) &vsm[1];
+ memcpy (peer_list, trail, trail_length * sizeof (struct GNUNET_PeerIdentity));
}
- return NULL;
+ /* Send the message to chosen friend. */
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
/**
- * Compute finger_identity to which we want to setup the trail
- * FIXME: If we maintain a index that is value of current_finger_index
- * to which a particular entry in finger map corresponds then should we first
- * check if there is already an entry for that index. If yes then don't
- * search for trail to that finger.
- * @return finger_identity
+ * FIXME: check if we can merge send_trail_teardown and trail_compression
+ * Construct a trail teardown message and send it to target_friend
+ * @param source_peer Source of the trail.
+ * @param destination_peer Destination of the trail.
+ * @param trail_id Unique identifier of the trail.
+ * @param trail_direction Direction of trail.
+ * @param target_friend Friend to get this message.
*/
-static uint64_t *
-compute_finger_identity()
+void
+GDS_NEIGHBOURS_send_trail_teardown (struct GNUNET_PeerIdentity source_peer,
+ struct GNUNET_PeerIdentity destination_peer,
+ struct GNUNET_HashCode trail_id,
+ enum GDS_ROUTING_trail_direction trail_direction,
+ struct FriendInfo *target_friend)
{
- uint64_t *my_id64 ;
- uint64_t *finger_identity64;
-
- my_id64 = GNUNET_malloc (sizeof (uint64_t));
- finger_identity64 = GNUNET_malloc (sizeof (uint64_t));
-
- memcpy(my_id64, &(my_identity.public_key.q_y), sizeof (uint64_t));
- *finger_identity64 = fmod ((*my_id64 + pow (2,current_finger_index)),( (pow (2,MAX_FINGERS))));
-
- return finger_identity64;
-}
+ struct PeerTrailTearDownMessage *ttdm;
+ struct P2PPendingMessage *pending;
+ size_t msize;
+ msize = sizeof (struct PeerTrailTearDownMessage);
-/**
- * TODO: Implement after testing friend/finger map.
- * TODO: Handle the case when we already have a trail to our predecessor in
- * the network.
- * This function will be needed when we are handling node joins/fails
- * to maintain correct pointer to our predecessor and successor in the network.
- * Find immediate predecessor in the network.
- * @param me my own identity
- * @return peer identity of immediate predecessor.
- */
-static uint64_t *
-find_immediate_predecessor()
-{
- /* Using your own peer identity, calculate your predecessor
- * in the network. Try to setup path to this predecessor using
- * the same logic as used for other fingers.
- * If we already have a trail to our predecessor then send NULL and
- * calling function should be able to handle that case.
- */
- /* FIXME: O could be a valid peer id, return something else. */
- return 0;
-}
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
+ }
-/**
- * Periodically verify your own immediate successor and
- * tell your successor about yourself.
- *
- * @param cls closure for this task
- * @param tc the context under which the task is running
- */
-static void
-send_verify_successor_message(void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc )
-{
- /*
- * FIXME:
- * Should we have a new message type
- * 1. like who is your predecessor.
- * 2. notify
- In this function
- 1. ask your immediate successor ( its stored in your finger table with
- field that notes that its immediate successor) who is its predecessor.
- 2. Then after getting the reply, check if its you.
- 3. If not then update the new successor and your successor
- and notify the new successor that you are its new predecessor.
- */
-
- /* okay so you first need to construct a messsage that you want to send
- to your "successor". but here you should just call another function which
- will construct the message and send it to first friend in the trial to
- reach our successor. */
- struct GNUNET_TIME_Relative next_send_time;
- //struct GNUNET_PeerIdentity *successor;
- //struct FingerInfo *finger;
-
- /* Iterate over your finger peermap to find the element with successor field set.
- That field is your successor. */
-
- /* In this function you should send your successor id, trail to reach that successor,
- trail_length, current_trial_index. */
- GDS_NEIGUBOURS_handle_verify_successor();
-
- /* FIXME: Use a random value so that this message is send not at the same
- interval as send_find_finger_trail_message. */
- next_send_time.rel_value_us =
- DHT_MINIMUM_FIND_FINGER_TRAIL_INTERVAL.rel_value_us +
- GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
- DHT_MAXIMUM_FIND_FINGER_TRAIL_INTERVAL.rel_value_us /
- (current_finger_index + 1));
-
- verify_successor =
- GNUNET_SCHEDULER_add_delayed (next_send_time, &send_verify_successor_message,
- NULL);
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ ttdm = (struct PeerTrailTearDownMessage *) &pending[1];
+ pending->msg = &ttdm->header;
+ ttdm->header.size = htons (msize);
+ ttdm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_TEARDOWN);
+ ttdm->source_peer = source_peer;
+ ttdm->destination_peer = destination_peer;
+ ttdm->TRAIL_ID = trail_id;
+ ttdm->trail_direction = htonl (trail_direction);
+
+ /* Send the message to chosen friend. */
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
/**
- * Task to send a find finger trail message. We attempt to find trail
- * to our finger and successor in the network.
- *
- * @param cls closure for this task
- * @param tc the context under which the task is running
+ * Construct a verify successor result message and send it to target_friend
+ * @param querying_peer Peer which sent the verify successor message.
+ * @param source_successor Current_successor of @a querying_peer.
+ * @param current_predecessor Current predecessor of @a successor. Could be same
+ * or different from @a querying_peer.
+ * @param trail_id Unique identifier of the trail from @a querying_peer to
+ * @a successor, NOT including them.
+ * @param trail List of peers which are part of trail from @a querying_peer to
+ * @a successor, NOT including them.
+ * @param trail_length Total number of peers in @a trail
+ * @param trail_direction Direction in which we are sending the message. In this
+ * case we are sending result from @a successor to @a querying_peer.
+ * @param target_friend Next friend to get this message.
*/
-static void
-send_find_finger_trail_message (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+void
+GDS_NEIGHBOURS_send_verify_successor_result (struct GNUNET_PeerIdentity querying_peer,
+ struct GNUNET_PeerIdentity source_successor,
+ struct GNUNET_PeerIdentity current_predecessor,
+ struct GNUNET_HashCode trail_id,
+ const struct GNUNET_PeerIdentity *trail,
+ unsigned int trail_length,
+ enum GDS_ROUTING_trail_direction trail_direction,
+ struct FriendInfo *target_friend)
{
- struct FriendInfo *friend;
- struct GNUNET_TIME_Relative next_send_time;
- uint64_t *finger_identity; /* FIXME: Better variable name */
+ struct PeerVerifySuccessorResultMessage *vsmr;
+ struct P2PPendingMessage *pending;
struct GNUNET_PeerIdentity *peer_list;
- unsigned int successor_flag; /* set to 1 if we are looking for first finger/
- our succcessor, else 0. */
-
- /* We already have found trail to each of our possible fingers in the network. */
- if (GNUNET_CONTAINER_multipeermap_size (finger_peermap) == MAX_FINGERS)
- {
- /* FIXME: I call find_immediate_predecessor when I have found trail to
- * all the possible fingers in the network. But we need to find immediate
- * predecessor when there is a node failure/join. It may happen before.
- * Think of a better strategy to decide when to call this function.
- * We can find trail to our immediate predecessor in the network.
- * I think its better to call this after we have trail to our successor set up.
- */
- finger_identity = find_immediate_predecessor();
-
- if(NULL == finger_identity)
- {
- /* We already have a trail to reach to immediate predecessor. */
- goto new_find_finger_trail_request;
- }
+ size_t msize;
+
+ msize = sizeof (struct PeerVerifySuccessorResultMessage) +
+ (trail_length * sizeof(struct GNUNET_PeerIdentity));
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
}
- else
+
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
{
- finger_identity = compute_finger_identity();
-
- if(finger_identity == NULL)
- {
- goto new_find_finger_trail_request;
- }
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
}
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ vsmr = (struct PeerVerifySuccessorResultMessage *) &pending[1];
+ pending->msg = &vsmr->header;
+ vsmr->header.size = htons (msize);
+ vsmr->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_VERIFY_SUCCESSOR_RESULT);
+ vsmr->querying_peer = querying_peer;
+ vsmr->source_successor = source_successor;
+ vsmr->current_predecessor = current_predecessor;
+ vsmr->trail_direction = htonl (trail_direction);
+ vsmr->trail_id = trail_id;
- if(0 == current_finger_index)
+ if (trail_length > 0)
{
- /* We are searching for our successor in the network. */
- successor_flag = 1;
- }
- friend = GNUNET_malloc (sizeof (struct FriendInfo));
- friend = select_random_friend();
-
- /* We found a friend.*/
- if(NULL != friend)
- {
- unsigned int trail_length = 2;
- peer_list = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) * trail_length);
- memcpy(&peer_list[0], &(my_identity), sizeof (struct GNUNET_PeerIdentity));
- memcpy(&peer_list[1], &(friend->id), sizeof (struct GNUNET_PeerIdentity));
- GDS_NEIGHBOURS_handle_trail_setup(&my_identity, finger_identity,
- friend, trail_length, peer_list,successor_flag);
+ peer_list = (struct GNUNET_PeerIdentity *) &vsmr[1];
+ memcpy (peer_list, trail, trail_length * sizeof (struct GNUNET_PeerIdentity));
}
-
- /* FIXME: Should we be using current_finger_index to generate random interval.*/
- new_find_finger_trail_request:
- next_send_time.rel_value_us =
- DHT_MINIMUM_FIND_FINGER_TRAIL_INTERVAL.rel_value_us +
- GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
- DHT_MAXIMUM_FIND_FINGER_TRAIL_INTERVAL.rel_value_us /
- (current_finger_index + 1));
-
- find_finger_trail_task =
- GNUNET_SCHEDULER_add_delayed (next_send_time, &send_find_finger_trail_message,
- NULL);
+
+ /* Send the message to chosen friend. */
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
/**
- * Method called whenever a peer connects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
+ * Construct a notify new successor message and send it to target_friend
+ * @param source_peer Peer which wants to notify to its new successor that it
+ * could be its predecessor.
+ * @param successor New successor of @a source_peer
+ * @param successor_trail List of peers in Trail to reach from
+ * @a source_peer to @a new_successor, NOT including
+ * the endpoints.
+ * @param successor_trail_length Total number of peers in @a new_successor_trail.
+ * @param successor_trail_id Unique identifier of @a new_successor_trail.
+ * @param target_friend Next friend to get this message.
*/
-static void
-handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
+void
+GDS_NEIGHBOURS_send_notify_new_successor (struct GNUNET_PeerIdentity source_peer,
+ struct GNUNET_PeerIdentity successor,
+ struct GNUNET_PeerIdentity *successor_trail,
+ unsigned int successor_trail_length,
+ struct GNUNET_HashCode succesor_trail_id,
+ struct FriendInfo *target_friend)
{
- struct FriendInfo *ret;
-
- /* Check for connect to self message */
- if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
- return;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connected to %s\n",
- GNUNET_i2s (peer));
-
- /* If peer already exists in our friend_peermap, then exit. */
- if (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_contains (friend_peermap,
- peer))
+ struct PeerNotifyNewSuccessorMessage *nsm;
+ struct P2PPendingMessage *pending;
+ struct GNUNET_PeerIdentity *peer_list;
+ size_t msize;
+
+ msize = sizeof (struct PeerNotifyNewSuccessorMessage) +
+ (successor_trail_length * sizeof(struct GNUNET_PeerIdentity));
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
return;
}
- GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), 1,
- GNUNET_NO);
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
+ }
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ nsm = (struct PeerNotifyNewSuccessorMessage *) &pending[1];
+ pending->msg = &nsm->header;
+ nsm->header.size = htons (msize);
+ nsm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_NOTIFY_NEW_SUCCESSOR);
+ nsm->new_successor = successor;
+ nsm->source_peer = source_peer;
+ nsm->trail_id = succesor_trail_id;
- ret = GNUNET_new (struct FriendInfo);
- ret->id = *peer;
-
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multipeermap_put (friend_peermap,
- peer, ret,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ if (successor_trail_length > 0)
+ {
+ peer_list = (struct GNUNET_PeerIdentity *) &nsm[1];
+ memcpy (peer_list, successor_trail,
+ successor_trail_length * sizeof (struct GNUNET_PeerIdentity));
+ }
-
- /* got a first connection, good time to start with FIND FINGER TRAIL requests... */
- if (1 == GNUNET_CONTAINER_multipeermap_size (friend_peermap))
- find_finger_trail_task = GNUNET_SCHEDULER_add_now (&send_find_finger_trail_message, NULL);
+ /* Send the message to chosen friend. */
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
/**
- * FIXME: Implement after testing finger/friend table setup.
- * Method called whenever a peer disconnects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
+ * Construct an add_trail message and send it to target_friend
+ * @param source_peer Source of the trail.
+ * @param destination_peer Destination of the trail.
+ * @param trail_id Unique identifier of the trail from
+ * @a source_peer to @a destination_peer, NOT including the endpoints.
+ * @param trail List of peers in Trail from @a source_peer to @a destination_peer,
+ * NOT including the endpoints.
+ * @param trail_length Total number of peers in @a trail.
+ * @param target_friend Next friend to get this message.
*/
-static void
-handle_core_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *peer)
+void
+GDS_NEIGHBOURS_send_add_trail (struct GNUNET_PeerIdentity source_peer,
+ struct GNUNET_PeerIdentity destination_peer,
+ struct GNUNET_HashCode trail_id,
+ struct GNUNET_PeerIdentity *trail,
+ unsigned int trail_length,
+ struct FriendInfo *target_friend)
{
- /**
- * 1. remove the friend from the friend map.
- * 2. remove the trail for the fingers for which this peer was the first hop.
- * 3. start send_find_finger_trail for these fingers to find a new trail
- * in the network.
- * 4. Also when a node gets disconnected, how should we update pointers of its
- * immediate successor and predecessor in the network ?
- * 5. Also how do we distribute the keys in the network?
- * 6. Here is case where we started put operation but a peer got disconnected and
- we removed the entry from the table. How to handle such a case.
- */
-}
+ struct PeerAddTrailMessage *adm;
+ struct GNUNET_PeerIdentity *peer_list;
+ struct P2PPendingMessage *pending;
+ size_t msize;
+ msize = sizeof (struct PeerAddTrailMessage) +
+ (trail_length * sizeof(struct GNUNET_PeerIdentity));
-/**
- * To be called on core init/fail.
- *
- * @param cls service closure
- * @param identity the public identity of this peer
- */
-static void
-core_init (void *cls,
- const struct GNUNET_PeerIdentity *identity)
-{
- my_identity = *identity;
- GNUNET_CRYPTO_hash (identity,
- sizeof (struct GNUNET_PeerIdentity),
- &my_identity_hash);
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
+ }
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ adm = (struct PeerAddTrailMessage *) &pending[1];
+ pending->msg = &adm->header;
+ adm->header.size = htons (msize);
+ adm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_ADD_TRAIL);
+ adm->source_peer = source_peer;
+ adm->destination_peer = destination_peer;
+ adm->trail_id = trail_id;
+
+ if (trail_length > 0)
+ {
+ peer_list = (struct GNUNET_PeerIdentity *)&adm[1];
+ memcpy (peer_list, trail, sizeof (struct GNUNET_PeerIdentity) * trail_length);
+ }
+
+ /* Send the message to chosen friend. */
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
}
/**
- * Core handler for p2p put requests.
- *
- * @param cls closure
- * @param peer sender of the request
- * @param message message
- * @param peer peer identity this notification is about
- * @return #GNUNET_OK to keep the connection open,
- * #GNUNET_SYSERR to close it (signal serious error)
+ * FIXME: Merge into "teardown", add source and "last/new_first" in message struct.
+ * Construct a trail compression message and send it to target_friend.
+ * @param source_peer Source of the trail.
+ * @param destination_finger Destination of trail.
+ * @param trail_id Unique identifier of trail.
+ * @param first_friend First hop in compressed trail to reach from source to finger
+ * @param target_friend Next friend to get this message.
*/
-static int
-handle_dht_p2p_put (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+void
+GDS_NEIGHBOURS_send_trail_compression (struct GNUNET_PeerIdentity source_peer,
+ struct GNUNET_PeerIdentity destination_peer,
+ struct GNUNET_HashCode trail_id,
+ struct GNUNET_PeerIdentity first_friend,
+ struct FriendInfo *target_friend)
{
- /**
- 1. Check if destination is friend or finger.
- 2. If finger then get the next hop from routing table and
- * call GDS_NEGIHBOURS_handle_get.
- 3. If friend then call find_successor to get the next hop and again
- * call GDS_NEIGHBOURS_handle_get to send to chosen hop.
- 4. If you are the destination then do datacache_store.
- */
- return 0;
+ struct P2PPendingMessage *pending;
+ struct PeerTrailCompressionMessage *tcm;
+ size_t msize;
+
+ msize = sizeof (struct PeerTrailCompressionMessage);
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ if (target_friend->pending_count >= MAXIMUM_PENDING_PER_FRIEND)
+ {
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop ("# P2P messages dropped due to full queue"),
+ 1, GNUNET_NO);
+ }
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pending->timeout = GNUNET_TIME_relative_to_absolute (GET_TIMEOUT);
+ tcm = (struct PeerTrailCompressionMessage *) &pending[1];
+ pending->msg = &tcm->header;
+ tcm->header.size = htons (msize);
+ tcm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_COMPRESSION);
+ tcm->source_peer = source_peer;
+ tcm->new_first_friend = first_friend;
+ tcm->trail_id = trail_id;
+ tcm->destination_peer = destination_peer;
+
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
+
}
/**
- * Core handler for p2p get requests.
- *
- * @param cls closure
- * @param peer sender of the request
- * @param message message
- * @return #GNUNET_OK to keep the connection open,
- * #GNUNET_SYSERR to close it (signal serious error)
+ * Search my location in trail.
+ * @param trail List of peers
+ * @return my_index if found
+ * -1 if no entry found.
*/
static int
-handle_dht_p2p_get (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+search_my_index (const struct GNUNET_PeerIdentity *trail,
+ int trail_length)
{
- /**
- 1. Check if destination is friend or finger.
- 2. If finger then get the next hop from routing table and
- * call GDS_NEGIHBOURS_handle_get.
- 3. If friend then call find_successor to get the next hop and again
- * call GDS_NEIGHBOURS_handle_get to send to chosen hop.
- 4. If you are the destination then send the data back to source peer
- * Assuming we have trail setup we can
- * either store the whole trail or again do the search process..
- */
- return 0;
+ int i;
+
+ for (i = 0; i < trail_length; i++)
+ {
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &trail[i]))
+ return i;
+ }
+
+ return -1;
}
/**
- * Compare two peer identities. Used with qsort or bsearch.
- *
- * @param p1 Some peer identity.
- * @param p2 Some peer identity.
- * @return 1 if p1 > p2, -1 if p1 < p2 and 0 if p1 == p2.
+ * Check if the friend is congested or have reached maximum number of trails
+ * it can be part of of.
+ * @param friend Friend to be chechked.
+ * @return #GNUNET_YES if friend is not congested or have not crossed threshold.
+ * #GNUNET_NO if friend is either congested or have crossed threshold
*/
static int
-peer_id_cmp (const void *p1, const void *p2)
+is_friend_congested (struct FriendInfo *friend)
{
- return memcmp (p1, p2, sizeof (uint64_t));
+ if ((friend->trails_count == TRAILS_THROUGH_FRIEND_THRESHOLD)||
+ ((0 != GNUNET_TIME_absolute_get_remaining
+ (friend->congestion_timestamp).rel_value_us)))
+ return GNUNET_YES;
+ else
+ return GNUNET_NO;
}
+
/**
- * Returns the previous element of value in all_known_peers.
- * @param all_known_peers list of all the peers
- * @param value value we have to search in the all_known_peers.
- * @return
+ * FIXME: here we should also check if iterator is null or not. It can be NULL
+ * only if we insert randomly at locations. But as we are using trails_count
+ * as the parameter, it should not happen.
+ * Iterate over the list of all the trails of a finger. In case the first
+ * friend to reach the finger has reached trail threshold or is congested,
+ * then don't select it. In case there multiple available good trails to reach
+ * to Finger, choose the one with shortest trail length.
+ * Note: We use length as parameter. But we can use any other suitable parameter
+ * also.
+ * @param finger Finger
+ * @return struct Selected_Finger_Trail which contains the first friend , trail id
+ * and trail length. NULL in case none of the trails are free.
*/
-static struct GNUNET_PeerIdentity *
-binary_search(struct GNUNET_PeerIdentity *all_known_peers, uint64_t *value,
- unsigned int size)
+static struct Selected_Finger_Trail *
+select_finger_trail (struct FingerInfo *finger)
{
- unsigned int first;
- unsigned int last;
- unsigned int middle;
- struct GNUNET_PeerIdentity *successor;
- successor = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
-
- first = 0;
- last = size - 1;
- middle = (first + last)/2;
+ struct FriendInfo *friend;
+ struct Trail *iterator;
+ struct Selected_Finger_Trail *finger_trail;
+ unsigned int i;
+
+ finger_trail = GNUNET_new (struct Selected_Finger_Trail);
- while(first <= last)
+ for (i = 0; i < finger->trails_count; i++)
{
- /* all_known_peers[middle] > value*/
- if(0 > peer_id_cmp(&all_known_peers[middle], &value))
- {
- first = middle + 1;
- }
- else if(0 == peer_id_cmp(&all_known_peers[middle], &value))
- {
- if(middle == 0)
- {
- successor = &(all_known_peers[size - 1]);
- }
- else
- successor = &(all_known_peers[middle-1]);
- }
- else
+ iterator = &finger->trail_list[i];
+ friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &iterator->trail_head->peer);
+ if (GNUNET_YES == is_friend_congested (friend))
+ continue;
+
+ /* Check if the trail length of this trail is least seen so far. If yes then
+ set finger_trail to this trail.*/
+ if (finger_trail->trail_length > iterator->trail_length)
{
- last = middle - 1;
+ finger_trail->friend = *friend;
+ finger_trail->trail_id = iterator->trail_id;
+ finger_trail->trail_length = iterator->trail_length;
}
-
- middle = (first + last)/2;
}
- return successor;
-}
+ /* No trail found. */
+ if (i == finger->trails_count)
+ finger_trail = NULL;
+
+ return finger_trail;
+}
/**
- * Find closest successor for the value.
- * @param value Value for which we are looking for successor
- * @param current_destination NULL if my_identity is successor else finger/friend
- * identity
- * @param type Next destination type
- * @return Peer identity of next destination i.e. successor of value.
+ * Select closest finger to value.
+ * @param peer1 First peer
+ * @param peer2 Second peer
+ * @param value Value to be compare
+ * @return Closest peer
*/
static struct GNUNET_PeerIdentity *
-find_successor(uint64_t *value, struct GNUNET_PeerIdentity *current_destination,
- enum current_destination_type *type)
-{
- /* 1. Create an array and copy all the peer identites from finger_peermap,
- friend_peermap, your own identity and value you are searching.
- 2. Sort the array.
- 3. Do a binary search on array to find the location of your value.
- 4. previous element of the value is your successor.
- 5. search for the successor in friend/finger/my_identity .
- 6. if my_identity, then return NULL and set type to my_identity
- 7. if friend, then return friend->id and set type to friend.
- 8. if finger, then set current_destination = finger and return the first
- element from the trail list of finger as next_hop. */
- struct GNUNET_CONTAINER_MultiPeerMapIterator *friend_iter;
- struct GNUNET_CONTAINER_MultiPeerMapIterator *finger_iter;
- struct GNUNET_PeerIdentity key_ret;
- struct FriendInfo *friend;
+select_closest_finger (struct GNUNET_PeerIdentity *peer1,
+ struct GNUNET_PeerIdentity *peer2,
+ uint64_t value)
+{
+#if 0
+ uint64_t peer1_value;
+ uint64_t peer2_value;
+
+ memcpy (&peer1_value, peer1, sizeof (uint64_t));
+ memcpy (&peer2_value, peer2, sizeof (uint64_t));
+
+ if ((peer1_value <= value) && (value <= peer2_value))
+ return peer2;
+ else if ((peer2_value <= value) && (value <= peer1_value))
+ return peer1;
+ else if ((peer1_value <= peer2_value) && (peer2_value <= value))
+ return peer1;
+ else if ((peer2_value <= peer1_value) && (peer1_value <= value))
+ return peer2;
+ else if ((value <= peer1_value) && (peer1_value <= peer2_value))
+ return peer1;
+ else /*if ((value <= peer2_value) && (peer2_value <= peer1_value))*/
+ return peer2;
+#endif
+ return NULL;
+}
+
+
+/**
+ * Select closest predecessor to value.
+ * @param peer1 First peer
+ * @param peer2 Second peer
+ * @param value Value to be compare
+ * @return Closest peer
+ */
+static struct GNUNET_PeerIdentity *
+select_closest_predecessor (struct GNUNET_PeerIdentity *peer1,
+ struct GNUNET_PeerIdentity *peer2,
+ uint64_t value)
+{
+ #if 0
+ uint64_t peer1_value;
+ uint64_t peer2_value;
+
+ memcpy (&peer1_value, peer1, sizeof (uint64_t));
+ memcpy (&peer2_value, peer2, sizeof (uint64_t));
+
+#endif
+ return NULL;
+}
+
+
+/**
+ * Select the closest peer among two peers (which should not be same)
+ * with respect to value and finger_map_index
+ * @param peer1 First peer
+ * @param peer2 Second peer
+ * @param value Value relative to which we find the closest
+ * @param finger_map_index Index in finger map. If equal to PREDECESSOR_FINGER_ID,
+ * then we use different logic than other
+ * finger_map_index
+ * @return Closest peer among two peers.
+ */
+static struct GNUNET_PeerIdentity *
+select_closest_peer (struct GNUNET_PeerIdentity *peer1,
+ struct GNUNET_PeerIdentity *peer2,
+ uint64_t value,
+ unsigned int finger_map_index)
+{
+ struct GNUNET_PeerIdentity *closest_peer;
+
+ if (PREDECESSOR_FINGER_ID == finger_map_index)
+ closest_peer = select_closest_predecessor (peer1, peer2, value);
+ else
+ closest_peer = select_closest_finger (peer1, peer2, value);
+
+ return closest_peer;
+}
+
+
+/**
+ * Find the successor for destination_finger_value among my_identity, all my
+ * friend and all my fingers. Don't consider friends or fingers
+ * which are congested or have crossed the threshold.
+ * @param destination_finger_value Peer closest to this value will be the next successor.
+ * @param next_destination [out] Updated to friend identity in case a friend is
+ * successor, updated to first friend to reach to finger
+ * in case finger is the destination.
+ * @param new_intermediate_trail_id [out] In case we finger is the @a next_destination,
+ * then we updated the field with trail id to reach
+ * to that finger.
+ * @param finger_map_index Index in finger peermap for which we are
+ * looking for a finger, to discern between
+ * IS_PREDECESSOR or not.
+ * @return Closest successor for value.
+ */
+static struct GNUNET_PeerIdentity *
+find_successor (uint64_t destination_finger_value,
+ struct GNUNET_PeerIdentity *best_known_destination,
+ struct GNUNET_HashCode *new_intermediate_trail_id,
+ unsigned int finger_map_index)
+{
+ struct Closest_Peer *current_successor;
+ struct GNUNET_PeerIdentity *next_hop;
+ struct GNUNET_CONTAINER_MultiPeerMapIterator *friend_iter;
+ struct GNUNET_CONTAINER_MultiHashMap32Iterator *finger_iter;
+ struct Selected_Finger_Trail *finger_trail;
+ struct FriendInfo *friend;
struct FingerInfo *finger;
- unsigned int finger_index;
- unsigned int friend_index;
- struct GNUNET_PeerIdentity *all_known_peers;
- struct GNUNET_PeerIdentity *successor;
- unsigned int size;
+ int i;
+
+ /* Initialize current_successor to my_identity. */
+ current_successor = GNUNET_new (struct Closest_Peer);
+ memcpy (¤t_successor->value, &my_identity, sizeof (uint64_t));
+ memset (¤t_successor->trail_id, 0, sizeof (current_successor->trail_id));
+ current_successor->next_hop = my_identity;
+ current_successor->best_known_destination = my_identity;
+
+ /* Iterate over friend_peermap and compare each friend with current_successor.*/
+ friend_iter = GNUNET_CONTAINER_multipeermap_iterator_create (friend_peermap);
+ for (i= 0; i < GNUNET_CONTAINER_multipeermap_size (friend_peermap); i++)
+ {
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_iterator_next (friend_iter, NULL,
+ (const void **)&friend));
+
+ if (GNUNET_YES == is_friend_congested (friend))
+ continue;
+
+ /* FIXME: select closest peer w.r.t. value. [friend_id, current_successor->id)
+ and [current_successor->id, friend_id). Check in which range value lies.
+ Also, check for wrap around. Set the value of current_successor accordingly.*/
+ }
+
+ /* Iterate over finger_hashmap and compare each finger with current_successor.*/
+ finger_iter = GNUNET_CONTAINER_multihashmap32_iterator_create (finger_hashmap);
+ for (i = 0; i < GNUNET_CONTAINER_multihashmap32_size (finger_hashmap); i++)
+ {
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap32_iterator_next (finger_iter, NULL,
+ (void *)&finger));
+
+ /* If I am my own finger, then ignore this finger. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&finger->finger_identity,
+ &my_identity))
+ continue;
+
+ /* If finger is friend. */
+ if(GNUNET_CONTAINER_multipeermap_get (friend_peermap, &finger->finger_identity))
+ {
+ /* If not congested then compare it with current_successor. */
+ if (GNUNET_NO == is_friend_congested (friend))
+ {
+ //compare it with current successor.
+ }
+ }
+ /* Choose one of the trail to reach to finger. */
+ finger_trail = select_finger_trail (finger);
+
+ /* In case no trail found, ignore this finger. */
+ if (NULL == finger_trail)
+ continue;
+
+ /* FIXME: select closest peer w.r.t. value. [finger->friend_id, current_successor->id)
+ and [current_successor->id, finger->friend_id). Check in which range value lies.
+ Also, check for wrap around. But this will give you the immediate predecessor
+ For example. if we have 0,1,6 and I am 0 and one of my finger is 6. Then
+ for 1, we will have ranges like [0,6) and [6,0) 1 lies in range from [0,6)
+ but successor is 6 not 0 as 6 is > than 1. If you are the closest one,
+ then set the values
+ in current_successor. Want to write a generic code so that it is used in
+ * finger_table_add also while choosing the closest one among new and existing
+ * one. */
+ }
+
+ best_known_destination = ¤t_successor->best_known_destination;
+ new_intermediate_trail_id = ¤t_successor->trail_id;
+ next_hop = ¤t_successor->next_hop;
+
+ return next_hop;
+}
+
+
+/**
+ * Construct a Put message and send it to target_peer.
+ * @param key Key for the content
+ * @param block_type Type of the block
+ * @param options Routing options
+ * @param desired_replication_level Desired replication count
+ * @param best_known_dest Peer to which this message should reach eventually,
+ * as it is best known destination to me.
+ * @param intermediate_trail_id Trail id in case
+ * @param target_peer Peer to which this message will be forwarded.
+ * @param hop_count Number of hops traversed so far.
+ * @param put_path_length Total number of peers in @a put_path
+ * @param put_path Number of peers traversed so far
+ * @param expiration_time When does the content expire
+ * @param data Content to store
+ * @param data_size Size of content @a data in bytes
+ */
+void
+GDS_NEIGHBOURS_send_put (const struct GNUNET_HashCode *key,
+ enum GNUNET_BLOCK_Type block_type,
+ enum GNUNET_DHT_RouteOption options,
+ uint32_t desired_replication_level,
+ struct GNUNET_PeerIdentity *best_known_dest,
+ struct GNUNET_HashCode *intermediate_trail_id,
+ struct GNUNET_PeerIdentity *target_peer,
+ uint32_t hop_count,
+ uint32_t put_path_length,
+ struct GNUNET_PeerIdentity *put_path,
+ struct GNUNET_TIME_Absolute expiration_time,
+ const void *data, size_t data_size)
+{
+ struct PeerPutMessage *ppm;
+ struct P2PPendingMessage *pending;
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity *pp;
+ size_t msize;
+
+ msize = put_path_length * sizeof (struct GNUNET_PeerIdentity) + data_size +
+ sizeof (struct PeerPutMessage);
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ put_path_length = 0;
+ msize = data_size + sizeof (struct PeerPutMessage);
+ }
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ /* This is the first call made from clients file. So, we should search for the
+ target_friend. */
+ if (NULL == target_peer)
+ {
+ uint64_t key_value;
+ struct GNUNET_PeerIdentity *next_hop;
+
+ memcpy (&key_value, key, sizeof (uint64_t));
+ next_hop = find_successor (key_value, best_known_dest,
+ intermediate_trail_id, GDS_FINGER_TYPE_NON_PREDECESSOR);
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity(next_hop, &my_identity))
+ {
+ /* I am the destination but we have already done datacache_put in client file. */
+ return;
+ }
+ else
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ }
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->timeout = expiration_time;
+ ppm = (struct PeerPutMessage *) &pending[1];
+ pending->msg = &ppm->header;
+ ppm->header.size = htons (msize);
+ ppm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_PUT);
+ ppm->options = htonl (options);
+ ppm->block_type = htonl (block_type);
+ ppm->hop_count = htonl (hop_count + 1);
+ ppm->desired_replication_level = htonl (desired_replication_level);
+ ppm->put_path_length = htonl (put_path_length);
+ ppm->expiration_time = GNUNET_TIME_absolute_hton (expiration_time);
+ ppm->best_known_destination = *best_known_dest;
+ ppm->key = *key;
+ if (NULL == intermediate_trail_id)
+ memset (&ppm->intermediate_trail_id, 0, sizeof (ppm->intermediate_trail_id));
+ else
+ ppm->intermediate_trail_id = *intermediate_trail_id;
+ pp = (struct GNUNET_PeerIdentity *) &ppm[1];
+ if (put_path_length != 0)
+ {
+ memcpy (pp, put_path,
+ sizeof (struct GNUNET_PeerIdentity) * put_path_length);
+ }
+ memcpy (&pp[put_path_length], data, data_size);
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
+}
+
+
+
+/**
+ * Construct a Get message and send it to target_peer.
+ * @param key Key for the content
+ * @param block_type Type of the block
+ * @param options Routing options
+ * @param desired_replication_level Desired replication count
+ * @param best_known_dest
+ * @param intermediate_trail_id
+ * @param target_peer Peer to which this message will be forwarded.
+ * @param hop_count Number of hops traversed so far.
+ * @param data Content to store
+ * @param data_size Size of content @a data in bytes
+ * @param get_path_length Total number of peers in @a get_path
+ * @param get_path Number of peers traversed so far
+ */
+void
+GDS_NEIGHBOURS_send_get (const struct GNUNET_HashCode *key,
+ enum GNUNET_BLOCK_Type block_type,
+ enum GNUNET_DHT_RouteOption options,
+ uint32_t desired_replication_level,
+ struct GNUNET_PeerIdentity *best_known_dest,
+ struct GNUNET_HashCode *intermediate_trail_id,
+ struct GNUNET_PeerIdentity *target_peer,
+ uint32_t hop_count,
+ uint32_t get_path_length,
+ struct GNUNET_PeerIdentity *get_path)
+{
+ struct PeerGetMessage *pgm;
+ struct P2PPendingMessage *pending;
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity *gp;
+ size_t msize;
+
+ msize = sizeof (struct PeerGetMessage) +
+ (get_path_length * sizeof (struct GNUNET_PeerIdentity));
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ if (NULL == target_peer)
+ {
+ struct GNUNET_PeerIdentity *next_hop;
+ uint64_t key_value;
+
+ memcpy (&key_value, key, sizeof (uint64_t));
+ // FIXME: endianess of key_value!?
+ /* FIXME: Here you should use enum GDS_NEIGHBOURS_FINGER_TYPE in place of 0. */
+ next_hop = find_successor (key_value, best_known_dest,
+ intermediate_trail_id, GDS_FINGER_TYPE_NON_PREDECESSOR);
+
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity(&my_identity,next_hop))
+ {
+ GDS_DATACACHE_handle_get (key,block_type, NULL, 0,
+ NULL, 0, 1, &my_identity, NULL,&my_identity);
+ return;
+ }
+ else
+ {
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ }
+ }
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0; /* FIXME */
+ pgm = (struct PeerGetMessage *) &pending[1];
+ pending->msg = &pgm->header;
+ pgm->header.size = htons (msize);
+ pgm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_GET);
+ pgm->get_path_length = htonl (get_path_length);
+ pgm->key = *key;
+ pgm->best_known_destination = *best_known_dest;
+ pgm->intermediate_trail_id = *intermediate_trail_id;
+ pgm->hop_count = htonl (hop_count + 1);
+
+ if (get_path != 0)
+ {
+ gp = (struct GNUNET_PeerIdentity *) &pgm[1];
+ memcpy (gp, get_path, get_path_length * sizeof (struct GNUNET_PeerIdentity));
+ }
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
+}
+
+
+/**
+ * Send the get result to requesting client.
+ * @param key Key of the requested data.
+ * @param type Block type
+ * @param target_peer Next peer to forward the message to.
+ * @param source_peer Peer which has the data for the key.
+ * @param put_path_length Number of peers in @a put_path
+ * @param put_path Path taken to put the data at its stored location.
+ * @param get_path_length Number of peers in @a get_path
+ * @param get_path Path taken to reach to the location of the key.
+ * @param expiration When will this result expire?
+ * @param data Payload to store
+ * @param data_size Size of the @a data
+ */
+void
+GDS_NEIGHBOURS_send_get_result (const struct GNUNET_HashCode *key,
+ enum GNUNET_BLOCK_Type type,
+ struct GNUNET_PeerIdentity *target_peer,
+ struct GNUNET_PeerIdentity *source_peer,
+ unsigned int put_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int get_path_length,
+ struct GNUNET_PeerIdentity *get_path,
+ struct GNUNET_TIME_Absolute expiration,
+ const void *data, size_t data_size)
+{
+ struct PeerGetResultMessage *get_result;
+ struct GNUNET_PeerIdentity *get_result_path;
+ struct GNUNET_PeerIdentity *pp;
+ struct P2PPendingMessage *pending;
+ struct FriendInfo *target_friend;
+ int current_path_index;
+ size_t msize;
+
+ msize = get_path_length * sizeof (struct GNUNET_PeerIdentity) + data_size +
+ sizeof (struct PeerPutMessage);
+
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ if(get_path_length > 0)
+ {
+ current_path_index = search_my_index(get_path, get_path_length);
+ if (GNUNET_SYSERR == current_path_index)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ }
+ if (0 == current_path_index)
+ {
+ GDS_CLIENTS_handle_reply (expiration, key, get_path_length,
+ get_path, put_path_length,
+ put_path, type, data_size, data);
+ return;
+ }
+
+ pending = GNUNET_malloc (sizeof (struct P2PPendingMessage) + msize);
+ pending->importance = 0;
+ get_result = (struct PeerGetResultMessage *)&pending[1];
+ pending->msg = &get_result->header;
+ get_result->header.size = htons (msize);
+ get_result->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_P2P_GET_RESULT);
+ get_result->key = *key;
+ /* FIXME: check if you are passing the correct querying_peer as described in
+ the get_result documentation. */
+ memcpy (&(get_result->querying_peer), source_peer, sizeof (struct GNUNET_PeerIdentity));
+ get_result->expiration_time = expiration;
+
+ if (get_path_length != 0)
+ {
+ get_result_path = (struct GNUNET_PeerIdentity *)&get_result[1];
+ memcpy (get_result_path, get_path,
+ sizeof (struct GNUNET_PeerIdentity) * get_path_length);
+ }
+ memcpy (&get_result_path[get_path_length], data, data_size);
+
+ /* FIXME: Is this correct? */
+ if (put_path_length != 0)
+ {
+ pp = (struct GNUNET_PeerIdentity *)&get_result_path[1];
+ memcpy (pp, put_path,sizeof (struct GNUNET_PeerIdentity) * put_path_length);
+ }
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &get_result_path[current_path_index - 1]);
+ GNUNET_CONTAINER_DLL_insert_tail (target_friend->head, target_friend->tail, pending);
+ target_friend->pending_count++;
+ process_friend_queue (target_friend);
+}
+
+
+/**
+ * Randomly choose one of your friends (which is not congested and have not crossed
+ * trail threshold) from the friends_peer map
+ * @return Friend Randomly chosen friend.
+ * NULL in case friend peermap is empty, or all the friends are either
+ * congested or have crossed trail threshold.
+ */
+static struct FriendInfo *
+select_random_friend ()
+{
+ unsigned int current_size;
+ uint32_t index;
+ unsigned int j = 0;
+ struct GNUNET_CONTAINER_MultiPeerMapIterator *iter;
+ struct GNUNET_PeerIdentity key_ret;
+ struct FriendInfo *friend;
+
+ current_size = GNUNET_CONTAINER_multipeermap_size (friend_peermap);
+ if (0 == current_size)
+ return NULL;
+
+ index = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, current_size);
+ iter = GNUNET_CONTAINER_multipeermap_iterator_create (friend_peermap);
+
+ for (j = 0; j < index ; j++)
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_iterator_next (iter, NULL, NULL));
+ do
+ {
+ if (j == current_size)
+ {
+ j = 0;
+ GNUNET_CONTAINER_multipeermap_iterator_destroy (iter);
+ iter = GNUNET_CONTAINER_multipeermap_iterator_create (friend_peermap);
+
+ }
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_iterator_next (iter,
+ &key_ret,
+ (const void **)&friend));
+
+
+ if ((TRAILS_THROUGH_FRIEND_THRESHOLD == friend->trails_count) &&
+ (0 == GNUNET_TIME_absolute_get_remaining (friend->congestion_timestamp).rel_value_us))
+ {
+ break;
+ }
+ friend = NULL;
+ j++;
+ } while (j != index);
+
+ GNUNET_CONTAINER_multipeermap_iterator_destroy (iter);
+ return friend;
+}
+
+
+/**
+ * FIXME: pass current_search_finger_index as parameter
+ * Compute finger_identity to which we want to setup the trail
+ * @return finger_identity
+ */
+static uint64_t
+compute_finger_identity_value ()
+{
+ uint64_t my_id64;
+
+ memcpy (&my_id64, &my_identity, sizeof (uint64_t));
+ my_id64 = GNUNET_ntohll (my_id64);
+ return (my_id64 + (unsigned long) pow (2, current_search_finger_index));
+}
+
+
+/**
+ * Compute immediate predecessor identity in the network.
+ * @return peer identity of immediate predecessor.
+ */
+static uint64_t
+compute_predecessor_identity_value ()
+{
+ uint64_t my_id64;
+
+ memcpy (&my_id64, &my_identity, sizeof (uint64_t));
+ my_id64 = GNUNET_ntohll (my_id64);
+ return (my_id64 -1);
+}
+
+
+/*
+ * Choose a random friend and start looking for the trail to reach to
+ * finger identity through this random friend.
+ *
+ * @param cls closure for this task
+ * @param tc the context under which the task is running
+ */
+static void
+send_find_finger_trail_message (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct FriendInfo *target_friend;
+ struct GNUNET_TIME_Relative next_send_time;
+ struct GNUNET_HashCode trail_id;
+ unsigned int is_predecessor;
+ uint64_t finger_id_value;
+
+ next_send_time.rel_value_us =
+ DHT_FIND_FINGER_TRAIL_INTERVAL.rel_value_us +
+ GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
+ DHT_FIND_FINGER_TRAIL_INTERVAL.rel_value_us);
+ find_finger_trail_task =
+ GNUNET_SCHEDULER_add_delayed (next_send_time, &send_find_finger_trail_message,
+ NULL);
+
+ target_friend = select_random_friend ();
+ if (NULL == target_friend)
+ {
+ return;
+ }
+
+ if (PREDECESSOR_FINGER_ID == current_search_finger_index)
+ {
+ finger_id_value = compute_predecessor_identity_value();
+ is_predecessor = 0;
+ }
+ else
+ {
+ finger_id_value = compute_finger_identity_value();
+ is_predecessor = 1;
+ }
+
+ GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
+ &trail_id, sizeof (trail_id));
+ GDS_NEIGHBOURS_send_trail_setup (my_identity, finger_id_value,
+ target_friend->id, target_friend, 0, NULL,
+ is_predecessor, trail_id, NULL);
+}
+
+
+/**
+ * In case there are already maximum number of possible trails to reach to a
+ * finger, then check if the new trail's length is lesser than any of the
+ * existing trails.
+ * If yes then replace that old trail by new trail.
+ *
+ * Note: Here we are taking length as a parameter to choose the best possible
+ * trail, but there could be other parameters also like:
+ * 1. duration of existence of a trail - older the better.
+ * 2. if the new trail is completely disjoint than the
+ * other trails, then may be choosing it is better.
+ *
+ * @param existing_finger
+ * @param new_finger_trail
+ * @param new_finger_trail_length
+ * @param new_finger_trail_id
+ */
+static void
+select_and_replace_trail (struct FingerInfo *existing_finger,
+ const struct GNUNET_PeerIdentity *new_trail,
+ unsigned int new_trail_length,
+ struct GNUNET_HashCode new_trail_id)
+{
+ struct Trail *trail_list_iterator;
+ unsigned int largest_trail_length;
+ unsigned int largest_trail_index;
+ struct Trail_Element *trail_element;
+ unsigned int i;
+
+ largest_trail_length = new_trail_length;
+ largest_trail_index = MAXIMUM_TRAILS_PER_FINGER + 1;
+
+ GNUNET_assert (MAXIMUM_TRAILS_PER_FINGER == existing_finger->trails_count);
+
+ for (i = 0; i < existing_finger->trails_count; i++)
+ {
+ trail_list_iterator = &existing_finger->trail_list[i];
+ if (trail_list_iterator->trail_length > largest_trail_length)
+ {
+ largest_trail_length = trail_list_iterator->trail_length;
+ largest_trail_index = i;
+ }
+ }
+
+ if (largest_trail_index == (MAXIMUM_TRAILS_PER_FINGER + 1))
+ {
+ // tear down new trail: it's not better than the existing ones
+ return;
+ }
+
+ /* Send trail teardown message across the replaced trail. */
+ struct Trail *replace_trail = &existing_finger->trail_list[largest_trail_index];
+ struct FriendInfo *target_friend =
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &replace_trail->trail_head->peer);
+
+ GDS_NEIGHBOURS_send_trail_teardown (my_identity,
+ existing_finger->finger_identity,
+ replace_trail->trail_id,
+ GDS_ROUTING_SRC_TO_DEST, target_friend);
+ /* Free the trail. */
+ while (NULL != (trail_element = replace_trail->trail_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (replace_trail->trail_head,
+ replace_trail->trail_tail, trail_element);
+ GNUNET_free (trail_element);
+ }
+
+ /* Add new trial at that location. */
+ i = 0;
+ while (i < new_trail_length)
+ {
+ struct Trail_Element *element = GNUNET_new (struct Trail_Element);
+ element->peer = new_trail[i];
+
+ GNUNET_CONTAINER_DLL_insert_tail (replace_trail->trail_head,
+ replace_trail->trail_tail,
+ element);
+ }
+}
+
+
+/**
+ * Check if the new trail to reach to finger is unique or do we already have
+ * such a trail present for finger.
+ * @param existing_finger Finger identity
+ * @param new_trail New trail to reach @a existing_finger
+ * @param trail_length Total number of peers in new_trail.
+ * @return #GNUNET_YES if the new trail is unique
+ * #GNUNET_NO if same trail is already present.
+ */
+static int
+is_new_trail_unique (struct FingerInfo *existing_finger,
+ const struct GNUNET_PeerIdentity *new_trail,
+ unsigned int trail_length)
+{
+ struct Trail *trail_list_iterator;
+ struct Trail_Element *trail_element;
+ int i;
+ int j;
+ int trail_unique = GNUNET_NO;
+
+ for (i = 0; i < existing_finger->trails_count; i++)
+ {
+ trail_list_iterator = &existing_finger->trail_list[i];
+ if (trail_list_iterator->trail_length != trail_length)
+ continue;
+ trail_element = trail_list_iterator->trail_head;
+ for (j = 0; j < trail_list_iterator->trail_length; j++)
+ {
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&new_trail[j],
+ &trail_element->peer))
+ {
+ trail_unique = GNUNET_YES;
+ break;
+ }
+ }
+ }
+ return trail_unique;
+}
+
+
+/**
+ * Add a new trail to existing finger.
+ * @param existing_finger
+ * @param new_finger_trail
+ * @param new_finger_trail_length
+ * @param new_finger_trail_id
+ */
+static void
+add_new_trail (struct FingerInfo *existing_finger,
+ const struct GNUNET_PeerIdentity *new_trail,
+ unsigned int new_trail_length,
+ struct GNUNET_HashCode new_trail_id)
+{
+ struct Trail *trail_list_iterator;
+ struct FriendInfo *first_friend;
+ int i;
+
+ if (GNUNET_NO == is_new_trail_unique (existing_finger, new_trail,
+ new_trail_length))
+ {
+ return;
+ }
+
+ // FIXME checking trail_head is NOT a valid way to verify an open slot
+ for (i = 0; existing_finger->trail_list[i].trail_head != NULL; i++)
+ GNUNET_assert (i < MAXIMUM_TRAILS_PER_FINGER);
+
+ trail_list_iterator = &existing_finger->trail_list[i];
+
+ if (new_trail_length > 0)
+ first_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &new_trail[0]);
+ else
+ first_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &(existing_finger->finger_identity));
+ first_friend->trails_count++;
+ /* FIXME; we removed this field but read fixme. */
+ //trail_list_iterator->first_friend_trail_count = first_friend->trails_count;
+ trail_list_iterator->trail_length = new_trail_length;
+
+ for (i = 0; i < new_trail_length; i++)
+ {
+ struct Trail_Element *element;
+ element = GNUNET_new (struct Trail_Element);
+
+ element->peer = new_trail[i];
+ GNUNET_CONTAINER_DLL_insert_tail (trail_list_iterator->trail_head,
+ trail_list_iterator->trail_tail,
+ element);
+ }
+ existing_finger->trails_count++;
+}
+
+
+/**
+ * Send trail teardown message on all trails associated with finger.
+ * @param finger_to_be_removed
+ */
+static void
+send_trail_teardown (struct FingerInfo *finger)
+{
+ struct Trail *trail_list_iterator;
+ struct FriendInfo *target_friend;
+ int i;
+
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&finger->finger_identity, &my_identity)
+ || (NULL != GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &finger->finger_identity)))
+ return;
+
+ for (i = 0; i < finger->trails_count; i++)
+ {
+ trail_list_iterator = &finger->trail_list[i];
+ if (trail_list_iterator->trail_length > 0)
+ {
+ target_friend =
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &trail_list_iterator->trail_head->peer);
+ // check target_friend
+ GDS_NEIGHBOURS_send_trail_teardown (my_identity, finger->finger_identity,
+ trail_list_iterator->trail_id,
+ GDS_ROUTING_SRC_TO_DEST,
+ target_friend);
+ }
+ }
+}
+
+
+/**
+ * Decrement the trail count of the first friend to reach the finger
+ * In case finger is the friend, then decrement its trail count.
+ * @param finger
+ */
+static void
+decrement_friend_trail_count (struct FingerInfo *finger)
+{
+ struct Trail *trail_list_iterator;
+ struct FriendInfo *target_friend;
+ int i = 0;
+
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&finger->finger_identity,
+ &my_identity))
+ return;
+
+ for (i = 0; i < finger->trails_count; i++)
+ {
+ trail_list_iterator = &finger->trail_list[i];
+ if (trail_list_iterator->trail_length > 0)
+ target_friend =
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &trail_list_iterator->trail_head->peer);
+ else
+ target_friend =
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &finger->finger_identity);
+
+ // check target_friend for NULL
+ /* FIXME: we have removed first_friend_trail_count field. */
+ target_friend->trails_count--;
+ //trail_list_iterator->first_friend_trail_count--;
+ }
+ return;
+}
+
+
+/**
+ * Free finger and its trail.
+ * @param finger Finger to be freed.
+ */
+static void
+free_finger (struct FingerInfo *finger)
+{
+ struct Trail *trail_list_iterator;
+ struct Trail_Element *trail_element;
+ unsigned int i;
+
+ for (i = 0; i < finger->trails_count; i++)
+ {
+ trail_list_iterator = &finger->trail_list[i];
+ while (NULL != (trail_element = trail_list_iterator->trail_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (trail_list_iterator->trail_head,
+ trail_list_iterator->trail_tail,
+ trail_element);
+ GNUNET_free (trail_element);
+ }
+ }
+ GNUNET_free (finger);
+}
+
+
+/**
+ * Add a new entry in finger hashmap at finger_map_index
+ * @param finger_identity Peer Identity of new finger
+ * @param finger_trail Trail to reach from me to finger (excluding both end points).
+ * @param finger_trail_length Total number of peers in @a finger_trail.
+ * @param trail_id Unique identifier of the trail.
+ * @param finger_map_index Index in finger hashmap.
+ * @return #GNUNET_OK if new entry is added
+ * #GNUNET_NO -- FIXME: need to check what value does hahsmap put
+ * returns on failure.
+ */
+static int
+add_new_entry (struct GNUNET_PeerIdentity finger_identity,
+ const struct GNUNET_PeerIdentity *finger_trail,
+ unsigned int finger_trail_length,
+ struct GNUNET_HashCode trail_id,
+ unsigned int finger_map_index)
+{
+ struct FingerInfo *new_entry;
+ struct FriendInfo *first_trail_hop;
+ struct Trail *first_trail;
+ int i = 0;
+
+ new_entry = GNUNET_new (struct FingerInfo);
+ new_entry->finger_identity = finger_identity;
+ new_entry->finger_map_index = finger_map_index;
+ new_entry->trails_count = 1;
+
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &finger_identity))
+ {
+ if (finger_trail_length > 0)
+ {
+ first_trail_hop = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &finger_trail[0]);
+ }
+ else
+ {
+ first_trail_hop = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &finger_identity);
+ }
+
+ first_trail_hop->trails_count++;
+ first_trail = &new_entry->trail_list[0];
+ /* FIXME: We have removed this field. */
+ //first_trail->first_friend_trail_count = first_trail_hop->trails_count;
+
+ while (i < finger_trail_length)
+ {
+ struct Trail_Element *element = GNUNET_new (struct Trail_Element);
+
+ element->next = NULL;
+ element->prev = NULL;
+ element->peer = finger_trail[i];
+ GNUNET_CONTAINER_DLL_insert_tail (first_trail->trail_head,
+ first_trail->trail_tail,
+ element);
+ i++;
+ }
+ }
+
+ return GNUNET_CONTAINER_multihashmap32_put (finger_hashmap,
+ new_entry->finger_map_index,
+ new_entry,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+}
+
+
+/**
+ * Scan the trail to check if there is any other friend in the trail other than
+ * first hop. If yes then shortcut the trail, send trail compression message to
+ * peers which are no longer part of trail and send back the updated trail
+ * and trail_length to calling function.
+ * @param finger_identity Finger whose trail we will scan.
+ * @param finger_trail [in, out] Trail to reach from source to finger,
+ * @param finger_trail_length Total number of peers in original finger_trail.
+ * @param finger_trail_id Unique identifier of the finger trail.
+ * @return updated trail length in case we shortcut the trail, else original
+ * trail length.
+ */
+static struct GNUNET_PeerIdentity *
+scan_and_compress_trail (struct GNUNET_PeerIdentity finger_identity,
+ const struct GNUNET_PeerIdentity *trail,
+ unsigned int trail_length,
+ struct GNUNET_HashCode trail_id,
+ int *new_trail_length)
+{
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity *new_trail;
+ int i;
+
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &finger_identity))
+ {
+ *new_trail_length = 0;
+ return NULL;
+ }
+
+ if (NULL != GNUNET_CONTAINER_multipeermap_get (friend_peermap, &finger_identity))
+ {
+ if (trail_length > 0)
+ {
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &trail[0]);
+ GDS_NEIGHBOURS_send_trail_compression (my_identity, finger_identity,
+ trail_id, finger_identity,
+ target_friend);
+ *new_trail_length = 0;
+ }
+ return NULL;
+ }
+
+ for (i = trail_length - 1; i > 0; i--)
+ {
+ if (NULL != GNUNET_CONTAINER_multipeermap_get (friend_peermap, &trail[i]))
+ {
+ struct FriendInfo *target_friend;
+ int j = 0;
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &trail[0]);
+ GDS_NEIGHBOURS_send_trail_compression (my_identity, finger_identity,
+ trail_id, trail[i],
+ target_friend);
+
+
+ /* Copy the trail from index i to index trail_length -1 and change
+ trail length and return */
+ new_trail = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) * i);
+ while (i < trail_length)
+ {
+ memcpy (&new_trail[j], &trail[i], sizeof(struct GNUNET_PeerIdentity));
+ j++;
+ i++;
+ }
+ *new_trail_length = j+1;
+ break;
+ return new_trail;
+ }
+ }
+ *new_trail_length = trail_length;
+ memcpy (new_trail, new_trail, trail_length * sizeof (struct GNUNET_PeerIdentity));
+ return new_trail;
+}
+
+
+/**
+ * FIXME: Ensure that we add trail in succession in the trail list.
+ * There are no free spots within the trail list.
+ * Send verify successor message to your successor on all trails to reach
+ * the successor.
+ * @param successor My current successor
+ */
+static void
+send_verify_successor_message (struct FingerInfo *successor)
+{
+ struct Trail *trail_list_iterator;
+ struct GNUNET_HashCode trail_id;
+ struct GNUNET_PeerIdentity next_hop;
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity *trail;
+ unsigned int trail_length;
+ int i;
+ int j;
+
+ for (i = 0; i < successor->trails_count; i++)
+ {
+ trail_list_iterator = &successor->trail_list[i];
+ GNUNET_assert (NULL != trail_list_iterator->trail_head);
+
+ if (trail_list_iterator->trail_length > 0)
+ {
+ struct Trail_Element *element;
+
+ trail_length = trail_list_iterator->trail_length;
+ trail = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity)
+ * trail_length);
+ element = trail_list_iterator->trail_head;
+ for (j = 0; j < trail_length; j++, element = element->next)
+ trail[j] = element->peer;
+ next_hop = trail_list_iterator->trail_head->peer;
+ }
+ else
+ {
+ trail = NULL;
+ trail_length = 0;
+ next_hop = successor->finger_identity;
+ }
+ trail_id = trail_list_iterator->trail_id;
+ GNUNET_assert (NULL != (target_friend =
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap, &next_hop)));
+
+ GDS_NEIGHBOURS_send_verify_successor_message (my_identity,
+ successor->finger_identity,
+ trail_id, trail, trail_length,
+ target_friend);
+ GNUNET_free_non_null (trail);
+ }
+}
+
+
+/**
+ * FIXME: Is it safe to assume that current_search_finger_index == finger_map_index?
+ * Update the current search finger index.
+ */
+static void
+update_current_search_finger_index (struct GNUNET_PeerIdentity new_finger_identity)
+{
+ struct FingerInfo *successor;
+
+ successor = GNUNET_CONTAINER_multihashmap32_get (finger_hashmap, 0);
+
+ if (0 == current_search_finger_index)
+ {
+ current_search_finger_index = PREDECESSOR_FINGER_ID;
+
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &new_finger_identity))
+ {
+ send_verify_successor_message (successor);
+ }
+ }
+ else if (0 == GNUNET_CRYPTO_cmp_peer_identity (&new_finger_identity,
+ &(successor->finger_identity)))
+ {
+ current_search_finger_index = 0;
+ }
+ else
+ current_search_finger_index = current_search_finger_index - 1;
+}
+
+/**
+ * FIXME: Is it sage to assume that finger_map_index == current_search_finger_index
+ * Calculate finger_map_index from initial value that we send in trail setup
+ * message.
+ * @param ultimate_destination_finger_value Value that we calculated from our
+ * identity and finger_map_index.
+ * @param is_predecessor Is the entry for predecessor or not.
+ * @return finger_map_index which is a value between 0 <= finger_map_index <= 64
+ * -1, if no valid finger_map_index is found.
+ */
+static int
+get_finger_map_index (uint64_t ultimate_destination_finger_value,
+ unsigned int is_predecessor)
+{
+ uint64_t my_id64;
+ unsigned int finger_map_index;
+
+ finger_map_index = -1;
+ memcpy (&my_id64, &my_identity, sizeof (uint64_t));
+
+ if (is_predecessor)
+ {
+ if(1 == (my_id64 - ultimate_destination_finger_value))
+ finger_map_index = PREDECESSOR_FINGER_ID;
+ }
+ else
+ {
+ finger_map_index = log (ultimate_destination_finger_value - my_id64);
+ }
+
+ if ((finger_map_index > PREDECESSOR_FINGER_ID) ||
+ (finger_map_index == current_search_finger_index))
+ finger_map_index = -1;
+
+ return finger_map_index;
+}
+
+
+/**
+ * Check if there is already an entry in finger peermap for given finger map index.
+ * If yes, then select the closest finger. If new and existing finger are same,
+ * the check if you can store more trails. If yes then add trail, else keep the best
+ * trails to reach to the finger. If the new finger is closest, add it.
+ * Then, update current_search_finger_index.
+ * @param new_finger_identity Peer Identity of new finger
+ * @param new_finger_trail Trail to reach the new finger
+ * @param new_finger_length Total number of peers in @a new_finger_trail.
+ * @param is_predecessor Is this entry for predecessor in finger_peermap.
+ * @param new_finger_trail_id Unique identifier of @new_finger_trail.
+ * @return #GNUNET_YES if the new entry is added
+ * #GNUNET_NO if new entry is not added, either it was discarded or
+ * it was same as existing finger at finger map index.
+ */
+static int
+finger_table_add (struct GNUNET_PeerIdentity finger_identity,
+ const struct GNUNET_PeerIdentity *finger_trail,
+ unsigned int finger_trail_length,
+ unsigned int is_predecessor,
+ uint64_t finger_value,
+ struct GNUNET_HashCode finger_trail_id)
+{
+ struct FingerInfo *existing_finger;
+ struct GNUNET_PeerIdentity *closest_peer;
+ int updated_finger_trail_length;
+ struct GNUNET_PeerIdentity *updated_trail;
+ unsigned int finger_map_index;
+ unsigned int new_entry_added;
+
+ new_entry_added = GNUNET_NO;
+
+ finger_map_index = get_finger_map_index (finger_value,
+ is_predecessor);
+
+ if (-1 == finger_map_index)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
+ updated_trail =
+ scan_and_compress_trail (finger_identity, finger_trail,
+ finger_trail_length, finger_trail_id,
+ &updated_finger_trail_length);
+
+ existing_finger = GNUNET_CONTAINER_multihashmap32_get (finger_hashmap,
+ finger_map_index);
+
+ /* No entry present in finger hashmap for given finger map index. */
+ if (NULL == existing_finger)
+ {
+ add_new_entry (finger_identity, updated_trail, updated_finger_trail_length,
+ finger_trail_id, finger_map_index);
+ update_current_search_finger_index (finger_identity);
+ return GNUNET_YES;
+ }
+
+ /* If existing entry and finger identity are not same. */
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&(existing_finger->finger_identity),
+ &finger_identity))
+ {
+ closest_peer = select_closest_peer (&existing_finger->finger_identity,
+ &finger_identity,
+ finger_value, finger_map_index);
+
+ /* If the new finger is the closest peer. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&finger_identity, closest_peer))
+ {
+ GNUNET_assert (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity,
+ &finger_identity));
+
+ send_trail_teardown (existing_finger);
+ decrement_friend_trail_count (existing_finger);
+ free_finger (existing_finger);
+ add_new_entry (finger_identity, updated_trail, updated_finger_trail_length,
+ finger_trail_id, finger_map_index);
+ new_entry_added = GNUNET_YES;
+ }
+ }
+ else
+ {
+ /* If both new and existing entry are same as my_identity, then do nothing. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&(existing_finger->finger_identity),
+ &my_identity))
+ {
+ return GNUNET_NO;
+ }
+
+ /* If the existing finger is not a friend. */
+ if (NULL ==
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &(existing_finger->finger_identity)))
+ {
+ if (existing_finger->trails_count < MAXIMUM_TRAILS_PER_FINGER)
+ add_new_trail (existing_finger, updated_trail,
+ finger_trail_length, finger_trail_id);
+ else
+ select_and_replace_trail (existing_finger, updated_trail,
+ finger_trail_length, finger_trail_id);
+ }
+ new_entry_added = GNUNET_NO;
+ }
+
+ update_current_search_finger_index (finger_identity);
+ return new_entry_added;
+}
+
+
+/**
+ * Core handler for P2P put messages.
+ * @param cls closure
+ * @param peer sender of the request
+ * @param message message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_dht_p2p_put (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerPutMessage *put;
+ struct GNUNET_PeerIdentity *put_path;
+ struct GNUNET_HashCode test_key;
+ enum GNUNET_DHT_RouteOption options;
+ struct GNUNET_PeerIdentity best_known_dest;
+ struct GNUNET_HashCode intermediate_trail_id;
+ struct GNUNET_PeerIdentity *next_hop;
+ void *payload;
+ size_t msize;
+ uint32_t putlen;
+ size_t payload_size;
+ uint64_t key_value;
+
+ msize = ntohs (message->size);
+ if (msize < sizeof (struct PeerPutMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ put = (struct PeerPutMessage *) message;
+ putlen = ntohl (put->put_path_length);
+
+ if ((msize <
+ sizeof (struct PeerPutMessage) +
+ putlen * sizeof (struct GNUNET_PeerIdentity)) ||
+ (putlen >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ best_known_dest = put->best_known_destination;
+ put_path = (struct GNUNET_PeerIdentity *) &put[1];
+ payload = &put_path[putlen];
+ options = ntohl (put->options);
+ intermediate_trail_id = put->intermediate_trail_id;
+
+ payload_size = msize - (sizeof (struct PeerPutMessage) +
+ putlen * sizeof (struct GNUNET_PeerIdentity));
+
+ switch (GNUNET_BLOCK_get_key (GDS_block_context, ntohl (put->block_type),
+ payload, payload_size, &test_key))
+ {
+ case GNUNET_YES:
+ if (0 != memcmp (&test_key, &put->key, sizeof (struct GNUNET_HashCode)))
+ {
+ char *put_s = GNUNET_strdup (GNUNET_h2s_full (&put->key));
+ GNUNET_break_op (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "PUT with key `%s' for block with key %s\n",
+ put_s, GNUNET_h2s_full (&test_key));
+ GNUNET_free (put_s);
+ return GNUNET_YES;
+ }
+ break;
+ case GNUNET_NO:
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ case GNUNET_SYSERR:
+ /* cannot verify, good luck */
+ break;
+ }
+
+ if (ntohl (put->block_type) == GNUNET_BLOCK_TYPE_REGEX) /* FIXME: do for all tpyes */
+ {
+ switch (GNUNET_BLOCK_evaluate (GDS_block_context,
+ ntohl (put->block_type),
+ NULL, /* query */
+ NULL, 0, /* bloom filer */
+ NULL, 0, /* xquery */
+ payload, payload_size))
+ {
+ case GNUNET_BLOCK_EVALUATION_OK_MORE:
+ case GNUNET_BLOCK_EVALUATION_OK_LAST:
+ break;
+
+ case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
+ case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
+ case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
+ case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
+ case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
+ case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
+ default:
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ }
+
+ /* extend 'put path' by sender */
+ struct GNUNET_PeerIdentity pp[putlen + 1];
+ if (0 != (options & GNUNET_DHT_RO_RECORD_ROUTE))
+ {
+ memcpy (pp, put_path, putlen * sizeof (struct GNUNET_PeerIdentity));
+ pp[putlen] = *peer;
+ putlen++;
+ }
+ else
+ putlen = 0;
+
+ memcpy (&key_value, &(put->key), sizeof (uint64_t));
+ if (0 != (GNUNET_CRYPTO_cmp_peer_identity (&best_known_dest, &my_identity)))
+ {
+ next_hop = GDS_ROUTING_get_next_hop (intermediate_trail_id,
+ GDS_ROUTING_SRC_TO_DEST);
+ }
+ else
+ {
+ /*FIXME: Here you should use enum GDS_NEIGHBOURS_FINGER_TYPE in place of 0. */
+ next_hop = find_successor (key_value, &best_known_dest,
+ &intermediate_trail_id, GDS_FINGER_TYPE_NON_PREDECESSOR);
+ }
+
+ if (NULL == next_hop)
+ {
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop ("# Next hop to forward the packet not found "
+ "trail setup request, packet dropped."),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+
+ GDS_CLIENTS_process_put (options,
+ ntohl (put->block_type),
+ ntohl (put->hop_count),
+ ntohl (put->desired_replication_level),
+ putlen, pp,
+ GNUNET_TIME_absolute_ntoh (put->expiration_time),
+ &put->key,
+ payload,
+ payload_size);
+
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity(&my_identity, next_hop)) /* I am the final destination */
+ {
+ GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh (put->expiration_time),
+ &(put->key),putlen, pp, ntohl (put->block_type),
+ payload_size, payload);
+ return GNUNET_YES;
+ }
+ else
+ {
+ GDS_NEIGHBOURS_send_put (&put->key,
+ ntohl (put->block_type),ntohl (put->options),
+ ntohl (put->desired_replication_level),
+ &best_known_dest, &intermediate_trail_id, next_hop,
+ ntohl (put->hop_count), putlen, pp,
+ GNUNET_TIME_absolute_ntoh (put->expiration_time),
+ payload, payload_size);
+
+ return GNUNET_YES;
+ }
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Core handler for p2p get requests.
+ *
+ * @param cls closure
+ * @param peer sender of the request
+ * @param message message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_dht_p2p_get (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerGetMessage *get;
+ struct GNUNET_PeerIdentity *get_path;
+ struct GNUNET_PeerIdentity best_known_dest;
+ struct GNUNET_HashCode intermediate_trail_id;
+ struct GNUNET_PeerIdentity *next_hop;
+ uint32_t get_length;
+ uint64_t key_value;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ if (msize < sizeof (struct PeerGetMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ get = (struct PeerGetMessage *)message;
+ get_length = ntohl (get->get_path_length);
+ best_known_dest = get->best_known_destination;
+ intermediate_trail_id = get->intermediate_trail_id;
+ if (get_length > 0)
+ get_path = (struct GNUNET_PeerIdentity *)&get[1];
+
+ if ((msize <
+ sizeof (struct PeerGetMessage) +
+ get_length * sizeof (struct GNUNET_PeerIdentity)) ||
+ (get_length >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ /* Add sender to get path */
+ struct GNUNET_PeerIdentity gp[get_length + 1];
+ memcpy (gp, get_path, get_length * sizeof (struct GNUNET_PeerIdentity));
+ gp[get_length + 1] = *peer;
+ get_length = get_length + 1;
+
+ memcpy (&key_value, &(get->key), sizeof (uint64_t));
+ if (0 != (GNUNET_CRYPTO_cmp_peer_identity (&best_known_dest, &my_identity)))
+ {
+ next_hop = GDS_ROUTING_get_next_hop (intermediate_trail_id,
+ GDS_ROUTING_SRC_TO_DEST);
+ }
+ else
+ {
+ /*FIXME: Here you should use enum GDS_NEIGHBOURS_FINGER_TYPE in place of 0. */
+ next_hop = find_successor (key_value, &best_known_dest,
+ &intermediate_trail_id, GDS_FINGER_TYPE_NON_PREDECESSOR);
+ }
+
+ if (NULL == next_hop)
+ {
+ GNUNET_STATISTICS_update (GDS_stats,
+ gettext_noop ("# Next hop to forward the packet not found "
+ "trail setup request, packet dropped."),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity(&my_identity, next_hop))
+ {
+ /* I am the destination.*/
+ struct GNUNET_PeerIdentity final_get_path[get_length+1];
+ struct GNUNET_PeerIdentity next_hop;
+
+ memcpy (final_get_path, gp, get_length * sizeof (struct GNUNET_PeerIdentity));
+ memcpy (&final_get_path[get_length+1], &my_identity, sizeof (struct GNUNET_PeerIdentity));
+ get_length = get_length + 1;
+ memcpy (&next_hop, &final_get_path[get_length-2], sizeof (struct GNUNET_PeerIdentity));
+ GDS_DATACACHE_handle_get (&(get->key),(get->block_type), NULL, 0, NULL, 0,
+ get_length, final_get_path,&next_hop, &my_identity);
+
+ return GNUNET_YES;
+ }
+ else
+ {
+ GDS_NEIGHBOURS_send_get (&(get->key), get->block_type, get->options,
+ get->desired_replication_level, &best_known_dest,
+ &intermediate_trail_id, next_hop, 0,
+ get_length, gp);
+ }
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Core handler for get result
+ * @param cls closure
+ * @param peer sender of the request
+ * @param message message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_dht_p2p_get_result (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerGetResultMessage *get_result;
+ struct GNUNET_PeerIdentity *get_path;
+ struct GNUNET_PeerIdentity *put_path;
+ void *payload;
+ size_t payload_size;
+ size_t msize;
+ unsigned int getlen;
+ unsigned int putlen;
+ int current_path_index;
+
+ msize = ntohs (message->size);
+ if (msize < sizeof (struct PeerGetResultMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ get_result = (struct PeerGetResultMessage *)message;
+ getlen = ntohl (get_result->get_path_length);
+ putlen = ntohl (get_result->put_path_length);
+
+ if ((msize <
+ sizeof (struct PeerGetResultMessage) +
+ getlen * sizeof (struct GNUNET_PeerIdentity) +
+ putlen * sizeof (struct GNUNET_PeerIdentity)) ||
+ (getlen >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity) ||
+ (putlen >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity))))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ if (getlen > 0)
+ get_path = (struct GNUNET_PeerIdentity *) &get_result[1];
+ payload = &get_path[getlen];
+ payload_size = msize - (sizeof (struct PeerGetResultMessage) +
+ getlen * sizeof (struct GNUNET_PeerIdentity));
+
+ if (putlen > 0)
+ put_path = &get_path[1];
+ else
+ put_path = NULL;
+
+ if (0 == (GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &(get_path[0]))))
+ {
+ GDS_CLIENTS_handle_reply (get_result->expiration_time, &(get_result->key),
+ getlen, get_path, putlen,
+ put_path, get_result->type, payload_size, payload);
+ return GNUNET_YES;
+ }
+ else
+ {
+ current_path_index = search_my_index (get_path, getlen);
+ if (GNUNET_SYSERR == current_path_index )
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ GDS_NEIGHBOURS_send_get_result (&(get_result->key), get_result->type,
+ &get_path[current_path_index - 1],
+ &(get_result->querying_peer), putlen, put_path,
+ getlen, get_path, get_result->expiration_time,
+ payload, payload_size);
+ return GNUNET_YES;
+ }
+ return GNUNET_SYSERR;
+}
+
+
+/* Core handle for PeerTrailSetupMessage.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+handle_dht_p2p_trail_setup (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct PeerTrailSetupMessage *trail_setup;
+ const struct GNUNET_PeerIdentity *trail_peer_list;
+ struct GNUNET_PeerIdentity local_best_known_destination;
+ struct GNUNET_PeerIdentity current_destination;
+ struct GNUNET_PeerIdentity *next_hop;
+ struct GNUNET_PeerIdentity next_peer;
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity source;
+ uint64_t ultimate_destination_finger_value;
+ struct GNUNET_HashCode new_intermediate_trail_id;
+ struct GNUNET_HashCode intermediate_trail_id;
+ struct GNUNET_HashCode trail_id;
+ unsigned int is_predecessor;
+ uint32_t trail_length;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ /* There are PeerId's appended to the end of the message! */
+ if (msize < sizeof (struct PeerTrailSetupMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ trail_setup = (const struct PeerTrailSetupMessage *) message;
+ trail_length = (msize - sizeof (struct PeerTrailSetupMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerTrailSetupMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ trail_peer_list = (const struct GNUNET_PeerIdentity *)&trail_setup[1];
+ current_destination = trail_setup->best_known_destination;
+ trail_id = trail_setup->trail_id;
+ ultimate_destination_finger_value =
+ GNUNET_ntohll (trail_setup->ultimate_destination_finger_value);
+ source = trail_setup->source_peer;
+ is_predecessor = ntohl (trail_setup->is_predecessor);
+ intermediate_trail_id = trail_setup->intermediate_trail_id;
+
+ if (GNUNET_YES == GDS_ROUTING_threshold_reached())
+ {
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, peer);
+ GDS_NEIGHBOURS_send_trail_rejection (source, ultimate_destination_finger_value,
+ my_identity, is_predecessor,
+ trail_peer_list, trail_length,
+ trail_id, target_friend,
+ CONGESTION_TIMEOUT);
+ return GNUNET_OK;
+ }
+
+
+ next_hop = find_successor (ultimate_destination_finger_value,
+ &local_best_known_destination,
+ &new_intermediate_trail_id, is_predecessor);
+
+ /* Are we just a part of a trail towards a finger (current_destination)? */
+ if (0 != (GNUNET_CRYPTO_cmp_peer_identity (&my_identity, ¤t_destination)))
+ {
+ struct GNUNET_PeerIdentity *closest_peer;
+
+ /* Select best successor among one found locally and current_destination.*/
+ closest_peer = select_closest_peer (&local_best_known_destination,
+ ¤t_destination,
+ ultimate_destination_finger_value,
+ is_predecessor);
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (¤t_destination,
+ closest_peer))
+ {
+ next_hop = GDS_ROUTING_get_next_hop (intermediate_trail_id,
+ GDS_ROUTING_SRC_TO_DEST);
+ if (NULL == next_hop) /* FIXME: Here we found next_hop NULL from routing table,
+ * but we still have a next_hop from find_successor.
+ * Should we not break and choose that next_hop. */
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
+ local_best_known_destination = current_destination;
+ new_intermediate_trail_id = intermediate_trail_id;
+ }
+ }
+
+ GNUNET_assert (NULL != next_hop);
+
+ /* Am I the final destination? */
+ if (0 == (GNUNET_CRYPTO_cmp_peer_identity (next_hop, &my_identity)))
+ {
+ if (0 == trail_length)
+ memcpy (&next_peer, &source, sizeof (struct GNUNET_PeerIdentity));
+ else
+ memcpy (&next_peer, &trail_peer_list[trail_length-1], sizeof (struct GNUNET_PeerIdentity));
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, &next_peer);
+ GDS_NEIGHBOURS_send_trail_setup_result (source,
+ my_identity,
+ target_friend, trail_length,
+ trail_peer_list,
+ ultimate_destination_finger_value,
+ is_predecessor, trail_id);
+ }
+ else
+ {
+ struct GNUNET_PeerIdentity peer_list[trail_length + 1];
+
+ memcpy (peer_list, trail_peer_list, trail_length * sizeof (struct GNUNET_PeerIdentity));
+ peer_list[trail_length] = my_identity;
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ GDS_NEIGHBOURS_send_trail_setup (source,
+ ultimate_destination_finger_value,
+ local_best_known_destination,
+ target_friend, trail_length + 1, peer_list,
+ is_predecessor, trail_id,
+ &new_intermediate_trail_id);
+ }
+ return GNUNET_OK;
+}
+
+
+/* FIXME: here we are calculating my_index and comparing also in this function.
+ And we are doing it again here in this function. Re factor the code. */
+/**
+ * Check if sender_peer and peer from which we should receive the message are
+ * same or different.
+ * @param trail_peer_list List of peers in trail
+ * @param trail_length Total number of peers in @a trail_peer_list
+ * @param sender_peer Peer from which we got the message.
+ * @param finger_identity Finger to which trail is setup. It is not part of trail.
+ * @return #GNUNET_YES if sender_peer and peer from which we should receive the
+ * message are different.
+ * #GNUNET_NO if sender_peer and peer from which we should receive the
+ * message are different.
+ */
+static int
+is_sender_peer_correct (const struct GNUNET_PeerIdentity *trail_peer_list,
+ unsigned int trail_length,
+ const struct GNUNET_PeerIdentity *sender_peer,
+ struct GNUNET_PeerIdentity finger_identity,
+ struct GNUNET_PeerIdentity source_peer)
+{
+ int my_index;
+
+ if (0 == (GNUNET_CRYPTO_cmp_peer_identity (&source_peer,
+ &my_identity)))
+ {
+ if (trail_length > 0)
+ {
+ // source, then trail_length > 0, trail_peer_list[0] != peer
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&trail_peer_list[0],
+ sender_peer))
+ return GNUNET_NO;
+ }
+ else
+ {
+ // source, trail_length == 0, finger != peer
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (sender_peer,
+ &finger_identity))
+ return GNUNET_NO;
+ }
+ }
+ else
+ {
+ my_index = search_my_index (trail_peer_list, trail_length);
+ if (-1 == my_index)
+ return GNUNET_NO;
+
+ // my_index == trail_length -1, finger != peer
+ if ((trail_length - 1) == my_index)
+ {
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (sender_peer,
+ &finger_identity))
+ return GNUNET_NO;
+ }
+ else
+ {
+ // FIXME: if trail_peer_list[my_index + 1] != peer
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (sender_peer,
+ &trail_peer_list[my_index + 1]))
+ return GNUNET_NO;
+ }
+ }
+ return GNUNET_YES;
+}
+
+
+/**
+ * Core handle for p2p trail setup result messages.
+ * @param closure
+ * @param message message
+ * @param peer sender of this message.
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+handle_dht_p2p_trail_setup_result(void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct PeerTrailSetupResultMessage *trail_result;
+ const struct GNUNET_PeerIdentity *trail_peer_list;
+ struct GNUNET_PeerIdentity next_hop;
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity querying_peer;
+ struct GNUNET_PeerIdentity finger_identity;
+ uint32_t trail_length;
+ uint64_t ulitmate_destination_finger_value;
+ uint32_t is_predecessor;
+ struct GNUNET_HashCode trail_id;
+ int my_index;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ if (msize < sizeof (struct PeerTrailSetupResultMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ trail_result = (const struct PeerTrailSetupResultMessage *) message;
+ trail_length = (msize - sizeof (struct PeerTrailSetupResultMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerTrailSetupResultMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ is_predecessor = htonl (trail_result->is_predecessor);
+ querying_peer = trail_result->querying_peer;
+ finger_identity = trail_result->finger_identity;
+ trail_id = trail_result->trail_id;
+ trail_peer_list = (const struct GNUNET_PeerIdentity *) &trail_result[1];
+ ulitmate_destination_finger_value =
+ GNUNET_ntohll (trail_result->ulitmate_destination_finger_value);
+ /* FIXME: here we are calculating my_index and comparing also in this function.
+ And we are doing it again here in this function. Re factor the code. */
+ /* Ensure that sender peer is the peer from which we were expecting the message. */
+ if (GNUNET_NO == is_sender_peer_correct (trail_peer_list,
+ trail_length,
+ peer, finger_identity, querying_peer))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
+ /* Am I the one who initiated the query? */
+ if (0 == (GNUNET_CRYPTO_cmp_peer_identity (&querying_peer,
+ &my_identity)))
+ {
+ finger_table_add (finger_identity, trail_peer_list,
+ trail_length, ulitmate_destination_finger_value,
+ is_predecessor, trail_id);
+ return GNUNET_YES;
+ }
+
+ my_index = search_my_index(trail_peer_list, trail_length);
+ if (-1 == my_index)
+ {
+ GNUNET_break_op(0);
+ return GNUNET_SYSERR;
+ }
+
+ if (my_index == 0)
+ next_hop = trail_result->querying_peer;
+ else
+ next_hop = trail_peer_list[my_index - 1];
+
+ /* If the querying_peer is its own finger, then don't add an entry in routing
+ * table as querying peer will discard the trail.
+ */
+ if (0 != (GNUNET_CRYPTO_cmp_peer_identity (&(trail_result->querying_peer),
+ &(trail_result->finger_identity))))
+ {
+ GDS_ROUTING_add (trail_id, next_hop, *peer);
+ }
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, &next_hop);
+ GDS_NEIGHBOURS_send_trail_setup_result (querying_peer, finger_identity,
+ target_friend, trail_length, trail_peer_list,
+ is_predecessor,
+ ulitmate_destination_finger_value,
+ trail_id);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Invert the trail.
+ * @param trail Trail to be inverted
+ * @param trail_length Total number of peers in the trail.
+ * @return Updated trail
+ */
+static struct GNUNET_PeerIdentity *
+invert_trail (const struct GNUNET_PeerIdentity *trail,
+ unsigned int trail_length)
+{
+ int i;
+ int j;
+ struct GNUNET_PeerIdentity *inverted_trail;
+
+ inverted_trail = GNUNET_malloc (sizeof(struct GNUNET_PeerIdentity) *
+ trail_length);
+ i = 0;
+ j = trail_length - 1;
+ while (i < trail_length)
+ {
+ inverted_trail[i] = trail[j];
+ i++;
+ j--;
+ }
+ return inverted_trail;
+}
+
+
+/**
+ * FIXME:
+ * my_current_predecessor != source_peer. get the trail to reach to
+ * my_current_predecessor and append it to the trail from source to me.
+ * It can contain duplicate elements. Need to get the correct one.
+ * In case the source peer of verify successor message is not my successor,
+ * then construct a trail from source peer to my current predecessor.
+ * @param my_predecessor my current predecessor.
+ * @param current_trail Trail from source to me.
+ * @param current_trail_length Total number of peers in @a current_trail
+ * @param new_trail_length [out] Total number of peers in updated trail.
+ * @return Updated trail from source peer to my_predecessor.
+ */
+static struct GNUNET_PeerIdentity *
+trail_source_to_my_predecessor (const struct GNUNET_PeerIdentity *current_trail,
+ unsigned int current_trail_length,
+ unsigned int *new_trail_length)
+{
+ struct GNUNET_PeerIdentity *new_trail;
+ struct Trail *trail_list_iterator;
+ struct Trail_Element *trail_iterator;
+ struct FingerInfo *my_predecessor;
+ unsigned int i;
unsigned int j;
- /* SUPU: 2 is added for my_identity and value. */
- size = GNUNET_CONTAINER_multipeermap_size (friend_peermap)+
- GNUNET_CONTAINER_multipeermap_size (finger_peermap)+
- 2;
+ unsigned int shortest_trail_length = 0;
+ unsigned int trail_index = 0;
+
+ my_predecessor = GNUNET_CONTAINER_multihashmap32_get (finger_hashmap,
+ PREDECESSOR_FINGER_ID);
+
+ for (i = 0; i < my_predecessor->trails_count; i++)
+ {
+ trail_list_iterator = &my_predecessor->trail_list[i];
+ if (trail_list_iterator->trail_length > shortest_trail_length)
+ continue;
+ shortest_trail_length = trail_list_iterator->trail_length;
+ trail_index = i;
+ }
+
+ *new_trail_length = current_trail_length + shortest_trail_length + 1;
+ new_trail = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) *
+ *new_trail_length);
+ memcpy (new_trail, current_trail,
+ current_trail_length * sizeof (struct GNUNET_PeerIdentity));
+ new_trail[current_trail_length + 1] = my_identity;
+
+ i = 0;
+ j = current_trail_length + 1;
+ trail_list_iterator = &my_predecessor->trail_list[trail_index];
+ trail_iterator = trail_list_iterator->trail_head;
+ while ( i < shortest_trail_length)
+ {
+ new_trail[j] = trail_iterator->peer;
+ j++;
+ i++;
+ trail_iterator = trail_iterator->next;
+ }
+
+ *new_trail_length = j;
+ return new_trail;
+}
+
+
+/**
+ * FIMXE: IF you update your predecessor with new finger identity or added
+ * a new trail, then you should send add_trail message or else the peers
+ * which are part of the trail to reach to your new predecessor will not
+ * know its existence.
+ * Check if we already have an entry for predecessor in our finger hashmap.
+ * If no, then add new predecessor.
+ * If yes, then compare new and existing entry. If both are same, and there is
+ * place to store more trail, then add entry. If both are different then choose
+ * the closest one.
+ * @param finger Peer which claims to be our predecessor.
+ * @param trail Trail to reach from @a predecessor to me, NOT including both endpoints
+ * @param trail_length Total number of peers in @a trail.
+ * @return #GNUNET_YES if we added the new entry.
+ * #GNUNET_NO, if new entry is not the closest predecessor or both new
+ * and existing entry are same.
+ */
+static struct GNUNET_PeerIdentity
+compare_and_update_predecessor (struct GNUNET_PeerIdentity finger_identity,
+ const struct GNUNET_PeerIdentity *trail,
+ unsigned int trail_length)
+{
+ struct FingerInfo *current_predecessor;
+ struct GNUNET_PeerIdentity *closest_peer;
+ struct GNUNET_PeerIdentity *inverted_trail;
+ struct GNUNET_HashCode trail_id;
+ uint64_t finger_value;
+
+ current_predecessor = GNUNET_CONTAINER_multihashmap32_get (finger_hashmap,
+ PREDECESSOR_FINGER_ID);
+ inverted_trail = invert_trail (trail, trail_length);
+
+ /* No predecessor in finger table. Add the new predecessor. */
+ if (NULL == current_predecessor)
+ {
+ add_new_entry (finger_identity, inverted_trail, trail_length,
+ trail_id, PREDECESSOR_FINGER_ID);
+ return finger_identity;
+ }
+
+ /* If the new predecessor and current predecessor are not same, then choose
+ the closest one. */
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&finger_identity,
+ ¤t_predecessor->finger_identity))
+ {
+ finger_value = compute_predecessor_identity_value();
+ closest_peer = select_closest_peer (¤t_predecessor->finger_identity,
+ &finger_identity,
+ finger_value, PREDECESSOR_FINGER_ID);
+
+ /* If the finger is the closest predecessor, then add it in finger table
+ * and free resources of current_predecessor. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&finger_identity, closest_peer))
+ {
+ GNUNET_assert (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity,
+ &finger_identity));
+
+ send_trail_teardown (current_predecessor);
+ decrement_friend_trail_count (current_predecessor);
+ free_finger (current_predecessor);
+ add_new_entry (finger_identity, inverted_trail, trail_length,
+ trail_id, PREDECESSOR_FINGER_ID);
+ return finger_identity;
+ }
+ }
- all_known_peers = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) * size);
+ /* If both finger and current_predecessor are same as my_identity, then do nothing. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&finger_identity, &my_identity))
+ return current_predecessor->finger_identity;
+
+ /* If the current_predecessor is not a friend. */
+ if (NULL ==
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ ¤t_predecessor->finger_identity))
+ {
+ if (current_predecessor->trails_count < MAXIMUM_TRAILS_PER_FINGER)
+ add_new_trail (current_predecessor, inverted_trail,
+ trail_length, trail_id);
+ //FIXME: here you should send add a new trail as you don't have this trail
+ // in the routing table.
+ else
+ select_and_replace_trail (current_predecessor, inverted_trail,
+ trail_length, trail_id);
+ //FIXME: here you should send add a new trail as you don't have this trail
+ // in the routing table.
+ }
+ return current_predecessor->finger_identity;
+}
+
+
+/**
+ * Core handle for p2p verify successor messages.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+handle_dht_p2p_verify_successor(void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerVerifySuccessorMessage *vsm;
+ struct GNUNET_PeerIdentity successor;
+ struct GNUNET_PeerIdentity source_peer;
+ struct GNUNET_PeerIdentity *next_hop;
+ struct FriendInfo *target_friend;
+ struct GNUNET_HashCode trail_id;
+ struct GNUNET_PeerIdentity current_predecessor;
+ struct GNUNET_PeerIdentity *trail;
+ struct GNUNET_PeerIdentity *new_trail;
+ unsigned int trail_length;
+ unsigned int new_trail_length;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ if (msize != sizeof (struct PeerVerifySuccessorMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+
+ vsm = (struct PeerVerifySuccessorMessage *) message;
+ trail_length = (msize - sizeof (struct PeerVerifySuccessorMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerVerifySuccessorMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
- j = 0;
- memcpy(&all_known_peers[j], &(my_identity), sizeof (struct GNUNET_PeerIdentity));
- j++;
- memcpy(&all_known_peers[j], value, sizeof(struct GNUNET_PeerIdentity));
+ trail = (struct GNUNET_PeerIdentity *)&vsm[1];
+ source_peer = vsm->source_peer;
+ successor = vsm->successor;
+ trail_id = vsm->trail_id;
+
+ /* I am not the successor of source_peer. Pass the message to next_hop on
+ * the trail. */
+ if(0 != (GNUNET_CRYPTO_cmp_peer_identity (&successor, &my_identity)))
+ {
+ next_hop = GDS_ROUTING_get_next_hop (trail_id, GDS_ROUTING_SRC_TO_DEST);
+ if (NULL == next_hop)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ GDS_NEIGHBOURS_send_verify_successor_message (source_peer, successor,
+ trail_id, trail, trail_length,
+ target_friend);
+ return GNUNET_OK;
+ }
- /* Iterate over friend peermap and copy all the elements into array. */
- friend_iter = GNUNET_CONTAINER_multipeermap_iterator_create (friend_peermap);
- for (friend_index = 0; friend_index < GNUNET_CONTAINER_multipeermap_size (friend_peermap); friend_index++)
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, peer);
+ current_predecessor = compare_and_update_predecessor (source_peer,
+ trail, trail_length);
+ /* source_peer is my current_predecessor. */
+ if(0 == (GNUNET_CRYPTO_cmp_peer_identity (¤t_predecessor, &source_peer)))
+ {
+ /* Here we don't need to pass the trail as it is of new use. We can pass
+ NULL and trail length = 0. */
+ new_trail = NULL;
+ new_trail_length = 0;
+ }
+ else
+ {
+ new_trail = trail_source_to_my_predecessor (trail, trail_length,
+ &new_trail_length);
+ }
+ GDS_NEIGHBOURS_send_verify_successor_result (source_peer, my_identity,
+ current_predecessor, trail_id,
+ new_trail, new_trail_length,
+ GDS_ROUTING_DEST_TO_SRC,
+ target_friend);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Here you may or may not be the predecessor. If you are then also while adding
+ * you have to check and if not then notify new successor. But again the trail
+ * may be a problem here.
+ * FIXME: I will keep the logic to remove the old trail to reach from me to
+ * my old successor here and move adding a new trail from me to new successor to notify
+ * new successor. And in case if the new successor also take it as predecessor
+ * then call add_trail.
+ * Core handle for p2p verify successor result messages.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+handle_dht_p2p_verify_successor_result(void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerVerifySuccessorResultMessage *vsrm;
+ enum GDS_ROUTING_trail_direction trail_direction;
+ struct GNUNET_HashCode trail_id;
+ unsigned int new_trail_length;
+ struct GNUNET_PeerIdentity *new_trail;
+ struct GNUNET_PeerIdentity querying_peer;
+ struct GNUNET_PeerIdentity current_predecessor;
+ //struct GNUNET_PeerIdentity old_successor;
+ struct GNUNET_PeerIdentity *next_hop;
+ struct FriendInfo *target_friend;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ if (msize != sizeof (struct PeerVerifySuccessorResultMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_YES;
+ }
+ vsrm = (struct PeerVerifySuccessorResultMessage *) message;
+ new_trail_length = (msize - sizeof (struct PeerTrailSetupMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerTrailSetupMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ trail_direction = ntohl (vsrm->trail_direction);
+ trail_id = vsrm->trail_id;
+
+ new_trail = (struct GNUNET_PeerIdentity *) &vsrm[1];
+ querying_peer = vsrm->querying_peer;
+ current_predecessor = vsrm->current_predecessor;
+ //old_successor = vsrm->source_successor;
+
+ if(0 == (GNUNET_CRYPTO_cmp_peer_identity (&querying_peer, &my_identity)))
+ {
+#if 0
+ //Here I am the final quering peer and its verify successor result.
+ // now I know it is for successor and now I don't have any finger_map_index
+ // as parameter in finger_table_add.
+ // BIG FIX HOW TO ADAPT IT FOR change in finger_table_add
+ struct GNUNET_HashCode new_finger_trail_id;
+ /* FIXME: generate a new trail id. */
+ if (GNUNET_YES == finger_table_add (my_new_successor,
+ new_trail,
+ new_trail_length,
+ PREDECESSOR_FINGER_ID, new_finger_trail_id))
+ {
+ if (new_trail_length > 0)
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ &new_trail[0]);
+ else
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ peer);
+ GDS_NEIGHBOURS_send_trail_teardown (my_identity, old_successor, trail_id,
+ GDS_ROUTING_SRC_TO_DEST, target_friend);
+ GDS_NEIGHBOURS_send_notify_new_successor (my_identity, my_new_successor,
+ new_trail,
+ new_trail_length,
+ new_finger_trail_id, target_friend);
+ }
+#endif
+ return GNUNET_OK;
+ }
+
+ GNUNET_assert (NULL != (next_hop =
+ GDS_ROUTING_get_next_hop (trail_id, trail_direction)));
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ GDS_NEIGHBOURS_send_verify_successor_result (querying_peer,
+ vsrm->source_successor,
+ current_predecessor, trail_id,
+ new_trail,
+ new_trail_length,
+ trail_direction, target_friend);
+ return GNUNET_OK;
+}
+
+
+/*
+ * FIXME: here before adding the peer you again have to call to check
+ * if its correct predecessor or not.
+ * Core handle for p2p notify new successor messages.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+handle_dht_p2p_notify_new_successor(void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerNotifyNewSuccessorMessage *nsm;
+ struct GNUNET_PeerIdentity *trail;
+ struct GNUNET_PeerIdentity source;
+ struct GNUNET_PeerIdentity new_successor;
+ struct FriendInfo *target_friend;
+ struct GNUNET_PeerIdentity closest_successor;
+ struct GNUNET_HashCode trail_id;
+ unsigned int my_index;
+ struct GNUNET_PeerIdentity next_hop;
+ size_t msize;
+ uint32_t trail_length;
+
+ msize = ntohs (message->size);
+ if (msize != sizeof (struct PeerNotifyNewSuccessorMessage))
{
- /* FIXME: I don't think we are actually iterating.
- Read about how to iterate over the multipeermap. */
- if(GNUNET_YES == GNUNET_CONTAINER_multipeermap_iterator_next(friend_iter,&key_ret,(const void **)&friend))
- {
- memcpy(&all_known_peers[j], &(friend->id), sizeof (struct GNUNET_PeerIdentity));
- j++;
- }
+ GNUNET_break_op (0);
+ return GNUNET_YES;
}
-
- /* Iterate over finger map and copy all the entries into all_known_peers array. */
- finger_iter = GNUNET_CONTAINER_multipeermap_iterator_create (finger_peermap);
- for (finger_index = 0; finger_index < GNUNET_CONTAINER_multipeermap_size (finger_peermap); finger_index++)
+
+ nsm = (struct PeerNotifyNewSuccessorMessage *) message;
+ trail_length = (msize - sizeof (struct PeerNotifyNewSuccessorMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerTrailRejectionMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
{
- /* FIXME: I don't think we are actually iterating.
- Read about how to iterate over the multi peer map. */
- if(GNUNET_YES == GNUNET_CONTAINER_multipeermap_iterator_next(finger_iter,&key_ret,(const void **)&finger))
- {
- memcpy(&all_known_peers[j], &(finger->finger_identity), sizeof (struct GNUNET_PeerIdentity));
- j++;
- }
- }
-
- qsort(all_known_peers, size, sizeof (struct GNUNET_PeerIdentity), &peer_id_cmp);
-
- /* search value in all_known_peers array. */
- successor = binary_search(all_known_peers, value, size);
-
- /* compare successor with my_identity, finger and friend */
- if(0 == GNUNET_CRYPTO_cmp_peer_identity(&(my_identity), successor))
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ if ((msize < sizeof (struct PeerNotifyNewSuccessorMessage) +
+ trail_length * sizeof (struct GNUNET_PeerIdentity)) ||
+ (trail_length >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
{
- *type = MY_ID;
- return NULL;
+ GNUNET_break_op (0);
+ return GNUNET_YES;
}
- else if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (friend_peermap,
- successor))
+
+ trail = (struct GNUNET_PeerIdentity *) &nsm[1];
+ source = nsm->source_peer;
+ new_successor = nsm->new_successor;
+ trail_id = nsm->trail_id;
+
+ /* I am the new_successor to source_peer. */
+ if ( 0 == GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &new_successor))
{
- *type = FRIEND;
- memcpy(current_destination, successor, sizeof (struct GNUNET_PeerIdentity));
- return successor;
+ closest_successor = compare_and_update_predecessor (source, trail, trail_length);
+ /* If the source peer is my new predecessor, then add trail in the
+ routing table of all the peers which are part of the trail to reach from
+ me to source, NOT including endpoints.
+ FIXME: In case we have same predecessor but we added just a new trail, then
+ we are not sending add a new trail message. Need to update this. */
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&closest_successor, &source))
+ {
+ struct GNUNET_HashCode new_trail_id;
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ peer);
+ GDS_NEIGHBOURS_send_add_trail (my_identity, source, new_trail_id,
+ trail, trail_length, target_friend);
+ }
+ return GNUNET_OK;
}
- else if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (finger_peermap,
- successor))
+
+ my_index = search_my_index (trail, trail_length);
+ if (-1 == my_index)
{
- *type = FINGER;
- memcpy(current_destination, successor, sizeof (struct GNUNET_PeerIdentity));
- /* get the corresponding finger for succcesor and read the first element from
- the trail list and return that element. */
- struct FingerInfo *successor_finger;
- struct GNUNET_PeerIdentity *next_hop;
- next_hop = GNUNET_malloc(sizeof (struct GNUNET_PeerIdentity));
- successor_finger = GNUNET_malloc (sizeof (struct FingerInfo));
- successor_finger = GNUNET_CONTAINER_multipeermap_get (finger_peermap, successor);
- memcpy(next_hop, &(successor_finger->trail_peer_list[0]), sizeof (struct GNUNET_PeerIdentity));
- return next_hop;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
- return NULL;
+ if (trail_length == my_index)
+ next_hop = new_successor;
+ else
+ next_hop = trail[my_index + 1];
+ GNUNET_assert (GNUNET_OK == GDS_ROUTING_add (trail_id, *peer, next_hop));
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, &next_hop);
+ GDS_NEIGHBOURS_send_notify_new_successor (source, new_successor, trail,
+ trail_length,
+ trail_id, target_friend);
+ return GNUNET_OK;
}
/**
- * Handle a PeerTrailSetupMessage.
+ * FIXME: Here you should keep the trail id with you.
+ * Core handler for P2P trail rejection message
* @param cls closure
* @param message message
* @param peer peer identity this notification is about
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
static int
-handle_dht_p2p_trail_setup(void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+handle_dht_p2p_trail_rejection(void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct PeerTrailSetupMessage *trail_setup;
- struct GNUNET_PeerIdentity *next_hop;
+ struct PeerTrailRejectionMessage *trail_rejection;
+ unsigned int trail_length;
+ struct GNUNET_PeerIdentity *trail_peer_list;
struct FriendInfo *target_friend;
+ struct GNUNET_TIME_Relative congestion_timeout;
+ struct GNUNET_HashCode trail_id;
+ struct GNUNET_PeerIdentity next_destination;
+ struct GNUNET_HashCode new_intermediate_trail_id;
+ struct GNUNET_PeerIdentity next_peer;
+ struct GNUNET_PeerIdentity source;
+ struct GNUNET_PeerIdentity *next_hop;
+ uint64_t ultimate_destination_finger_value;
+ unsigned int is_predecessor;
size_t msize;
- uint32_t trail_length;
- enum current_destination_type peer_type;
- struct GNUNET_PeerIdentity *trail_peer_list;
- uint32_t current_trail_index;
- struct GNUNET_PeerIdentity *next_peer;
-
- /* parse and validate message. */
msize = ntohs (message->size);
- if (msize < sizeof (struct PeerTrailSetupMessage))
+ if (msize != sizeof (struct PeerTrailRejectionMessage))
{
GNUNET_break_op (0);
return GNUNET_YES;
}
-
- trail_setup = (struct PeerTrailSetupMessage *) message;
- trail_length = ntohl (trail_setup->trail_length);
- peer_type = ntohl (trail_setup->current_destination_type);
- trail_peer_list = (struct GNUNET_PeerIdentity *) &trail_setup[1];
-
- if ((msize <
- sizeof (struct PeerTrailSetupMessage) +
- trail_length * sizeof (struct GNUNET_PeerIdentity)) ||
- (trail_length >
- GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
+
+ trail_rejection = (struct PeerTrailRejectionMessage *) message;
+ trail_length = (msize - sizeof (struct PeerTrailRejectionMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerTrailRejectionMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
{
GNUNET_break_op (0);
- return GNUNET_YES; /*TODO: Why do we send GNUNET_YES here? */
+ return GNUNET_OK;
+ }
+
+ trail_peer_list = (struct GNUNET_PeerIdentity *)&trail_rejection[1];
+ is_predecessor = ntohl (trail_rejection->is_predecessor);
+ congestion_timeout = trail_rejection->congestion_time;
+ source = trail_rejection->source_peer;
+ trail_id = trail_rejection->trail_id;
+ ultimate_destination_finger_value =
+ trail_rejection->ultimate_destination_finger_value;
+
+ /* First set the congestion time of the friend that sent you this message. */
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, peer);
+ target_friend->congestion_timestamp = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
+ congestion_timeout);
+
+ if(0 == (GNUNET_CRYPTO_cmp_peer_identity (&my_identity, &source)))
+ {
+ return GNUNET_OK;
}
-
-
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# TRAIL SETUP requests received"), 1,
- GNUNET_NO);
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# TRAIL SETUP bytes received"), msize,
- GNUNET_NO);
-
- if(peer_type == FRIEND)
+
+ /* If I am congested then pass this message to peer before me in trail. */
+ if(GNUNET_YES == GDS_ROUTING_threshold_reached())
{
- if(0 == (GNUNET_CRYPTO_cmp_peer_identity(&(trail_setup->current_destination),&my_identity)))
+ struct GNUNET_PeerIdentity *new_trail;
+ unsigned int new_trail_length;
+
+ if (trail_length == 1)
{
- next_hop = find_successor(&(trail_setup->destination_finger),&(trail_setup->current_destination),&(peer_type));
+ new_trail = NULL;
+ new_trail_length = 0;
+ next_hop = &source;
}
else
- return GNUNET_SYSERR; /*TODO: Should we handle this case differently? */
+ {
+ next_hop = &trail_peer_list[trail_length - 2];
+ /* Remove myself from the trail. */
+ new_trail_length = trail_length -1;
+ new_trail = GNUNET_malloc (new_trail_length * sizeof (struct GNUNET_PeerIdentity));
+ memcpy (new_trail, trail_peer_list, new_trail_length * sizeof (struct GNUNET_PeerIdentity));
+ }
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ GDS_NEIGHBOURS_send_trail_rejection (source,
+ ultimate_destination_finger_value,
+ my_identity, is_predecessor,
+ new_trail,new_trail_length,trail_id,
+ target_friend, CONGESTION_TIMEOUT);
+ return GNUNET_YES;
}
- else if(peer_type == FINGER)
+
+ /* Look for next_hop to pass the trail setup message */
+ next_hop = find_successor (ultimate_destination_finger_value,
+ &next_destination,
+ &new_intermediate_trail_id,
+ is_predecessor);
+
+ if (0 == (GNUNET_CRYPTO_cmp_peer_identity (next_hop, &my_identity)))/* This means I am the final destination */
{
- if(0 != (GNUNET_CRYPTO_cmp_peer_identity(&(trail_setup->current_destination),&my_identity)))
- {
- /* I am part of trail.
- SUPU: So, I should ask for next hop to reach the current_destination which is the finger
- for which this packet has been sent. */
- next_hop = GDS_ROUTING_search(&(trail_setup->source_peer),&(trail_setup->current_destination));
-
- /*TODO:
- call find_successor and compare the two peer ids
- and choose whichever is closest to the destination finger. */
- }
+ if (0 == trail_length)
+ next_peer = source;
else
- {
- /* I am the current_destination finger
- FIXME: Why are we sending current_destination to find_successor.
- In this case, is it safe to assume current_Destination = my_identity.
- I guess we are sending current_destination so that we update it with new
- current_destination, if could either me, friend or finger.*/
- next_hop = find_successor(&(trail_setup->destination_finger),&(trail_setup->current_destination),&(peer_type));
- }
+ next_peer = trail_peer_list[trail_length-1];
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, &next_peer);
+ GDS_NEIGHBOURS_send_trail_setup_result (source,
+ my_identity,
+ target_friend, trail_length,
+ trail_peer_list,
+ is_predecessor,
+ ultimate_destination_finger_value,
+ trail_id);
}
-
- /* If you are the next hop */
- if(peer_type == MY_ID)
- {
- /* FIXME: Verify if its allowed here to definer peer_list and define it
- again in the next block below? */
- struct GNUNET_PeerIdentity *peer_list;
- peer_list = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) * (trail_length));
- memcpy(peer_list, trail_peer_list, trail_length * sizeof (struct GNUNET_PeerIdentity));
- current_trail_index = trail_length - 2;
- next_peer = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity)); //FIXME: Do we need to allocate the memory?
- memcpy(next_peer, &peer_list[current_trail_index], sizeof (struct GNUNET_PeerIdentity));
-
- target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_peer);
-
- /* FIXME: It does not find a friend. Could be possible error in find_successor
- function. Change the logic in find_successor and change it again. */
-
- /* FIXME: Here as destination_finger is 64 bit instead of struct
- GNUNET_PeerIdentity, but you need destination_peer id. If you calling the
- function handle_Trail_setup_result from here, it means you are the
- destination. So, you can send your own identity. */
- GDS_NEIGHBOURS_handle_trail_setup_result(&(trail_setup->source_peer),
- &(my_identity),
- target_friend, trail_length,
- peer_list,current_trail_index,
- trail_setup->successor_flag);
-
- return GNUNET_YES;
+ else
+ {
+ struct GNUNET_PeerIdentity peer_list[trail_length + 1];
+
+ memcpy (peer_list, trail_peer_list, trail_length * sizeof (struct GNUNET_PeerIdentity));
+ peer_list[trail_length] = my_identity;
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ GDS_NEIGHBOURS_send_trail_setup (source,
+ ultimate_destination_finger_value,
+ next_destination,
+ target_friend, trail_length + 1, peer_list,
+ is_predecessor, trail_id,
+ &new_intermediate_trail_id);
}
-
- /* Add next_hop to list of peers that trail setup message have traversed so far
- and increment trail length. */
- struct GNUNET_PeerIdentity *peer_list;
- peer_list = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity) * (trail_length + 1));
- memcpy(peer_list, trail_peer_list, trail_length * sizeof (struct GNUNET_PeerIdentity));
- memcpy(&peer_list[trail_length], next_hop, sizeof (struct GNUNET_PeerIdentity));
- trail_length++;
-
- target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
-
- if(peer_type == FINGER)
+ return GNUNET_OK;
+}
+
+
+/*
+ * Core handle for p2p trail tear down messages.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+handle_dht_p2p_trail_compression (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerTrailCompressionMessage *trail_compression;
+ struct GNUNET_PeerIdentity *next_hop;
+ struct GNUNET_HashCode trail_id;
+ struct FriendInfo *target_friend;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ if (msize != sizeof (struct PeerTrailCompressionMessage))
{
- GDS_ROUTING_add(&(trail_setup->source_peer),&(trail_setup->current_destination),next_hop);
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
-
- GDS_NEIGHBOURS_handle_trail_setup(&(trail_setup->source_peer),
- &(trail_setup->destination_finger),
- target_friend,
- trail_setup->trail_length,
- peer_list,trail_setup->successor_flag);
-return GNUNET_YES;
+
+ trail_compression = (struct PeerTrailCompressionMessage *) message;
+ trail_id = trail_compression->trail_id;
+
+ if (0 == (GNUNET_CRYPTO_cmp_peer_identity (&(trail_compression->new_first_friend),
+ &my_identity)))
+ {
+ if(0 != (GNUNET_CRYPTO_cmp_peer_identity (&(trail_compression->destination_peer),
+ &my_identity)))
+ {
+ GDS_ROUTING_update_trail_prev_hop (trail_id,
+ trail_compression->source_peer);
+ }
+ return GNUNET_OK;
+ }
+
+ next_hop = GDS_ROUTING_get_next_hop (trail_id, GDS_ROUTING_SRC_TO_DEST);
+ if (NULL == next_hop)
+ {
+ GNUNET_break (0); /*FIXME: How to handle this case. */
+ return GNUNET_OK;
+ }
+ GNUNET_assert (GNUNET_YES == GDS_ROUTING_remove_trail (trail_id));
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_hop);
+ GDS_NEIGHBOURS_send_trail_compression (trail_compression->source_peer,
+ trail_compression->destination_peer,
+ trail_id,
+ trail_compression->new_first_friend,
+ target_friend);
+ return GNUNET_OK;
}
/**
- * FIXME : Add interval field.
- * When adding successor or predeccsor, update a field to
- * specify that this entry is not a finger but immediate
- * successor or predeccesor.
- * Add an entry in finger table.
- * @param finger Finger to be added to finger table
- * @param peer_list peers this request has traversed so far
- * @param trail_length Numbers of peers in the trail.
+ * Core handler for trail teardown message.
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
-static
-void finger_table_add(struct GNUNET_PeerIdentity *finger,
- const struct GNUNET_PeerIdentity *peer_list,
- unsigned int trail_length,
- unsigned int successor_flag)
-{
- /*FIXME: okay so there are two fields. one we should remember what finger
- identity we were looking for and what successor id we got. */
- struct FingerInfo *finger_entry;
- finger_entry = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
- memcpy(&(finger_entry->finger_identity), finger, sizeof(struct GNUNET_PeerIdentity));
- memcpy(&(finger_entry->trail_peer_list), peer_list, sizeof(struct GNUNET_PeerIdentity)
- * trail_length);
- finger_entry->successor = successor_flag;
- if (1 == GNUNET_CONTAINER_multipeermap_size (finger_peermap))
- verify_successor = GNUNET_SCHEDULER_add_now (&send_verify_successor_message, NULL);
+static int
+handle_dht_p2p_trail_teardown (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct PeerTrailTearDownMessage *trail_teardown;
+ struct GNUNET_HashCode trail_id;
+ enum GDS_ROUTING_trail_direction trail_direction;
+ size_t msize;
+
+ msize = ntohs (message->size);
+ if (msize != sizeof (struct PeerTrailTearDownMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ trail_teardown = (struct PeerTrailTearDownMessage *) message;
+ trail_direction = ntohl (trail_teardown->trail_direction);
+ trail_id = trail_teardown->TRAIL_ID;
+
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity,
+ &trail_teardown->destination_peer))
+ {
+ struct GNUNET_PeerIdentity *next_hop;
+ struct FriendInfo *target_friend;
+
+ next_hop = GDS_ROUTING_get_next_hop (trail_id, trail_direction);
+ if (NULL == next_hop)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap,
+ next_hop);
+ GNUNET_assert (GNUNET_YES == GDS_ROUTING_remove_trail (trail_id));
+ GDS_NEIGHBOURS_send_trail_teardown (trail_teardown->source_peer,
+ trail_teardown->destination_peer,
+ trail_id, trail_direction,
+ target_friend);
+ }
+ return GNUNET_OK;
}
/**
- * Core handle for p2p trail construction result messages.
+ * Fixme: this function is called only in case in notify new successor, the new
+ * successor wants to add the source of the peer as its predecessor. Identify
+ * if there is any other use case where it is required and if yes then adapt the
+ * code for it.
+ * Core handle for p2p add trail message.
* @param cls closure
* @param message message
* @param peer peer identity this notification is about
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
static int
-handle_dht_p2p_trail_setup_result(void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
+handle_dht_p2p_add_trail (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
{
- struct PeerTrailSetupResultMessage *trail_result;
+ struct PeerAddTrailMessage *add_trail;
+ struct GNUNET_PeerIdentity *trail;
+ struct GNUNET_HashCode trail_id;
+ struct GNUNET_PeerIdentity destination_peer;
+ struct GNUNET_PeerIdentity source_peer;
+ struct GNUNET_PeerIdentity next_hop;
+ unsigned int trail_length;
+ unsigned int my_index;
size_t msize;
- uint32_t trail_length;
- const struct GNUNET_PeerIdentity *trail_peer_list;
- uint32_t current_trail_index;
- struct GNUNET_PeerIdentity *next_peer;
- struct FriendInfo *target_friend;
-
+
msize = ntohs (message->size);
- if (msize < sizeof (struct PeerTrailSetupMessage))
+ if (msize != sizeof (struct PeerAddTrailMessage))
{
GNUNET_break_op (0);
- return GNUNET_YES;
+ return GNUNET_OK;
}
-
- trail_result = (struct PeerTrailSetupResultMessage *) message;
- trail_length = ntohl (trail_result->trail_length);
- current_trail_index = ntohl(trail_result->current_index);
- trail_peer_list = (struct GNUNET_PeerIdentity *) &trail_result[1];
-
- if ((msize <
- sizeof (struct PeerTrailSetupResultMessage) +
- trail_length * sizeof (struct GNUNET_PeerIdentity)) ||
+
+ add_trail = (struct PeerAddTrailMessage *) message;
+ trail_length = (msize - sizeof (struct PeerAddTrailMessage))/
+ sizeof (struct GNUNET_PeerIdentity);
+ if ((msize - sizeof (struct PeerAddTrailMessage)) %
+ sizeof (struct GNUNET_PeerIdentity) != 0)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ if ((msize < sizeof (struct PeerAddTrailMessage) +
+ trail_length * sizeof (struct GNUNET_PeerIdentity)) ||
(trail_length >
GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
{
GNUNET_break_op (0);
- return GNUNET_YES;
+ return GNUNET_OK;
}
-
- if(0 == (GNUNET_CRYPTO_cmp_peer_identity (&(trail_result->current_destination), &my_identity)))
+
+ trail = (struct GNUNET_PeerIdentity *)&add_trail[1];
+ destination_peer = add_trail->destination_peer;
+ source_peer = add_trail->source_peer;
+ trail_id = add_trail->trail_id;
+
+ if (0 != GNUNET_CRYPTO_cmp_peer_identity (&my_identity,
+ &destination_peer))
{
- /* Am I the destination? */
- if( 0 == (GNUNET_CRYPTO_cmp_peer_identity(&(trail_result->destination_peer), &my_identity)))
+ struct FriendInfo *target_friend;
+
+ my_index = search_my_index (trail, trail_length);
+ if (GNUNET_SYSERR == my_index)
{
- finger_table_add(&(trail_result->finger), trail_peer_list,trail_length,trail_result->successor_flag);
- return GNUNET_YES;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
+
+ if (0 == my_index)
+ next_hop = source_peer;
else
- {
- next_peer = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
- current_trail_index = current_trail_index - 1;
- memcpy(next_peer, &(trail_peer_list[trail_length-1]), sizeof (struct GNUNET_PeerIdentity));
- target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, next_peer);
-
- GDS_NEIGHBOURS_handle_trail_setup_result(&(trail_result->destination_peer),
- &(trail_result->finger),
- target_friend, trail_length,
- trail_peer_list,current_trail_index,
- trail_result->successor_flag);
- return GNUNET_YES;
- }
+ next_hop = trail[trail_length - 1];
+
+ GNUNET_assert (GNUNET_OK == GDS_ROUTING_add (trail_id, next_hop, *peer));
+ target_friend = GNUNET_CONTAINER_multipeermap_get (friend_peermap, &next_hop);
+ GDS_NEIGHBOURS_send_add_trail (source_peer, destination_peer, trail_id,
+ trail, trail_length, target_friend);
}
- else
- return GNUNET_SYSERR;
+ return GNUNET_OK;
}
/**
- * Core handle for p2p verify successor messages.
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ *FIXME; call send_trail_teardown_message on all the trails of the finger that
+ * you remove. Also you don't need to decerement friend trail count as that
+ * friend is removed. But you can not send trail teardown message as the friend
+ * is disconnected. then you don't have any next_hop. and in case there are
+ * multiple trails. and friend is the first trail then you remove only the trail.
+ * Iterate over finger_hashmap, and remove entries if finger is the disconnected
+ * peer or if disconnected peer is the first friend in the trail to reach the
+ * finger.
+ * @param cls closure
+ * @param key current public key
+ * @param value value in the hash map
+ * @return #GNUNET_YES if we should continue to
+ * iterate,
+ * #GNUNET_NO if not.
*/
static int
-handle_dht_p2p_verify_successor()
+remove_matching_finger (void *cls,
+ uint32_t key,
+ void *value)
{
- /*
- * In this function you have received the message verify successor,
- * Now, either you are the destination or just part of the trail.
- * As we already know the whole path find out the next destination
- * and pass the packet forward.
- * If you are the final destination, check who is your predecessor.
- * and send your predecessor back to calling function.
- * FIXME: Should we have a different handler function for it.
- */
+ struct FingerInfo *remove_finger = value;
+ const struct GNUNET_PeerIdentity *disconnected_peer = cls;
+ struct Trail *trail_list;
+ int i;
+
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&remove_finger->finger_identity,
+ disconnected_peer))
+ {
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap32_remove (finger_hashmap,
+ key,
+ remove_finger));
+ free_finger (remove_finger);
+ return GNUNET_YES;
+ }
+
+ for (i = 0; i< remove_finger->trails_count; i++)
+ {
+ trail_list = &remove_finger->trail_list[i];
+ if (0 == GNUNET_CRYPTO_cmp_peer_identity (&trail_list->trail_head->peer,
+ disconnected_peer))
+ {
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap32_remove (finger_hashmap,
+ key,
+ remove_finger));
+ free_finger (remove_finger);
+ }
+ }
+
return GNUNET_YES;
}
+
/**
- * Core handle for p2p notify successor messages.
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * Method called whenever a peer disconnects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
*/
-static int
-handle_dht_p2p_notify_new_successor()
+static void
+handle_core_disconnect (void *cls,
+ const struct GNUNET_PeerIdentity *peer)
{
- /*
- * So, if you are the destination you should update your
- * predecessor field with peer id of source peer of this message.
- * If you are not the destination peer, then just check your routing
- * table and pass on the message.
- */
- return GNUNET_YES;
+ struct FriendInfo *remove_friend;
+
+ if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
+ return;
+
+ remove_friend =
+ GNUNET_CONTAINER_multipeermap_get (friend_peermap, peer);
+
+ if (NULL == remove_friend)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ GNUNET_assert (GNUNET_SYSERR !=
+ GNUNET_CONTAINER_multihashmap32_iterate (finger_hashmap,
+ &remove_matching_finger,
+ (void *)peer));
+ GDS_ROUTING_remove_trail_by_peer (peer);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_remove (friend_peermap,
+ peer,
+ remove_friend));
+
+ if (0 != GNUNET_CONTAINER_multipeermap_size (friend_peermap))
+ return;
+
+ if (GNUNET_SCHEDULER_NO_TASK != find_finger_trail_task)
+ {
+ GNUNET_SCHEDULER_cancel (find_finger_trail_task);
+ find_finger_trail_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ else
+ GNUNET_break (0);
}
+
/**
- * Core handle for p2p verify successor result messages.
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * Method called whenever a peer connects.
+ *
+ * @param cls closure
+ * @param peer_identity peer identity this notification is about
*/
-static int
-handle_dht_p2p_verify_successor_result()
+static void
+handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer_identity)
{
- /*
- * In this function you have received the message verify successor result,
- If you are not the destination, just pass this message forward
- * if you are destination,
- * then check if immediate predecessor of this peer is you or someone else.
- * If its you, then don't do anything.
- * If its some one else, then call notify method to let your new successor
- * know that you are its predecessor.
- */
- return GNUNET_YES;
+ struct FriendInfo *friend;
+
+ /* Check for connect to self message */
+ if (0 == memcmp (&my_identity, peer_identity, sizeof (struct GNUNET_PeerIdentity)))
+ return;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected to %s\n", GNUNET_i2s (peer_identity));
+
+ /* If peer already exists in our friend_peermap, then exit. */
+ if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains (friend_peermap, peer_identity))
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ GNUNET_STATISTICS_update (GDS_stats, gettext_noop ("# peers connected"), 1,
+ GNUNET_NO);
+
+ friend = GNUNET_new (struct FriendInfo);
+ friend->id = *peer_identity;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multipeermap_put (friend_peermap,
+ peer_identity, friend,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+
+ /* got a first connection, good time to start with FIND FINGER TRAIL requests... */
+ if (GNUNET_SCHEDULER_NO_TASK == find_finger_trail_task)
+ find_finger_trail_task = GNUNET_SCHEDULER_add_now (&send_find_finger_trail_message, NULL);
+}
+
+
+/**
+ * To be called on core init/fail.
+ *
+ * @param cls service closure
+ * @param identity the public identity of this peer
+ */
+static void
+core_init (void *cls,
+ const struct GNUNET_PeerIdentity *identity)
+{
+ my_identity = *identity;
}
/**
* Initialize neighbours subsystem.
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
-GDS_NEIGHBOURS_init()
+GDS_NEIGHBOURS_init (void)
{
static struct GNUNET_CORE_MessageHandler core_handlers[] = {
- {&handle_dht_p2p_get, GNUNET_MESSAGE_TYPE_DHT_P2P_GET, 0},
{&handle_dht_p2p_put, GNUNET_MESSAGE_TYPE_DHT_P2P_PUT, 0},
+ {&handle_dht_p2p_get, GNUNET_MESSAGE_TYPE_DHT_P2P_GET, 0},
+ {&handle_dht_p2p_get_result, GNUNET_MESSAGE_TYPE_DHT_P2P_GET_RESULT, 0},
{&handle_dht_p2p_trail_setup, GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP, 0},
{&handle_dht_p2p_trail_setup_result, GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_SETUP_RESULT, 0},
{&handle_dht_p2p_verify_successor, GNUNET_MESSAGE_TYPE_DHT_P2P_VERIFY_SUCCESSOR, 0},
- {&handle_dht_p2p_notify_new_successor, GNUNET_MESSAGE_TYPE_DHT_P2P_NOTIFY_NEW_SUCCESSOR, 0},
{&handle_dht_p2p_verify_successor_result, GNUNET_MESSAGE_TYPE_DHT_P2P_VERIFY_SUCCESSOR_RESULT, 0},
+ {&handle_dht_p2p_notify_new_successor, GNUNET_MESSAGE_TYPE_DHT_P2P_NOTIFY_NEW_SUCCESSOR, 0},
+ {&handle_dht_p2p_trail_rejection, GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_REJECTION, 0},
+ {&handle_dht_p2p_trail_compression, GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_COMPRESSION, 0},
+ {&handle_dht_p2p_trail_teardown, GNUNET_MESSAGE_TYPE_DHT_P2P_TRAIL_TEARDOWN, 0},
+ {&handle_dht_p2p_add_trail, GNUNET_MESSAGE_TYPE_DHT_P2P_ADD_TRAIL, 0},
{NULL, 0, 0}
};
- /*TODO: What is ATS? Why do we need it? */
- atsAPI = GNUNET_ATS_performance_init (GDS_cfg, NULL, NULL);
core_api =
GNUNET_CORE_connect (GDS_cfg, NULL, &core_init, &handle_core_connect,
- &handle_core_disconnect, NULL, GNUNET_NO, NULL,
- GNUNET_NO, core_handlers);
- if (core_api == NULL)
+ &handle_core_disconnect, NULL, GNUNET_NO, NULL,
+ GNUNET_NO, core_handlers);
+ if (NULL == core_api)
return GNUNET_SYSERR;
friend_peermap = GNUNET_CONTAINER_multipeermap_create (256, GNUNET_NO);
- finger_peermap = GNUNET_CONTAINER_multipeermap_create (MAX_FINGERS, GNUNET_NO);
-
+ finger_hashmap = GNUNET_CONTAINER_multihashmap32_create (MAX_FINGERS * 4/3);
+
return GNUNET_OK;
}
-
/**
* Shutdown neighbours subsystem.
*/
void
-GDS_NEIGHBOURS_done ()
+GDS_NEIGHBOURS_done (void)
{
if (NULL == core_api)
return;
-
+
GNUNET_CORE_disconnect (core_api);
core_api = NULL;
- GNUNET_ATS_performance_done (atsAPI);
- atsAPI = NULL;
- /* FIXME: Once handle_core_disconnect is implemented, both below assertion should not
- fail. */
GNUNET_assert (0 == GNUNET_CONTAINER_multipeermap_size (friend_peermap));
GNUNET_CONTAINER_multipeermap_destroy (friend_peermap);
friend_peermap = NULL;
- GNUNET_assert (0 == GNUNET_CONTAINER_multipeermap_size (finger_peermap));
- GNUNET_CONTAINER_multipeermap_destroy (finger_peermap);
- finger_peermap = NULL;
+ GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap32_size (finger_hashmap));
+ GNUNET_CONTAINER_multihashmap32_destroy (finger_hashmap);
+ finger_hashmap = NULL;
if (GNUNET_SCHEDULER_NO_TASK != find_finger_trail_task)
{
+ GNUNET_break (0);
GNUNET_SCHEDULER_cancel (find_finger_trail_task);
find_finger_trail_task = GNUNET_SCHEDULER_NO_TASK;
}
-
- /* FIXME: fix_fingers will also be a task like this.
- Add it later. */
- if (GNUNET_SCHEDULER_NO_TASK != verify_successor)
- {
- GNUNET_SCHEDULER_cancel (verify_successor);
- verify_successor = GNUNET_SCHEDULER_NO_TASK;
- }
-
}
/**
- * Get the ID of the local node.
+ * Get my identity
*
- * @return identity of the local node
+ * @return my identity
*/
-struct GNUNET_PeerIdentity *
-GDS_NEIGHBOURS_get_id ()
+struct GNUNET_PeerIdentity
+GDS_NEIGHBOURS_get_my_id (void)
{
- return &my_identity;
+ return my_identity;
}
-
-
-/* end of gnunet-service-xdht_neighbours.c */
\ No newline at end of file
projects / oweals / gnunet.git / blobdiff