/**
* @file mesh/gnunet-service-mesh.c
- * @brief GNUnet MESH service
+ * @brief GNUnet MESH service with encryption
* @author Bartlomiej Polot
*
* FIXME in progress:
- * - keep queues until receiving ACK
+ * - rekey - reliability interaction
+ * - channel retransmit timing
*
* TODO:
* - relay corking down to core
* - set ttl relative to path length
- * - add signatures
- * - add encryption
* TODO END
- */
-
-#include "platform.h"
-#include "mesh.h"
-#include "mesh_protocol.h"
-#include "mesh_path.h"
-#include "block_mesh.h"
-#include "gnunet_dht_service.h"
-#include "gnunet_statistics_service.h"
-
-#define MESH_BLOOM_SIZE 128
-
-#define MESH_DEBUG_DHT GNUNET_NO
-#define MESH_DEBUG_CONNECTION GNUNET_NO
-#define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
-
-#define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
- GNUNET_TIME_UNIT_MINUTES,\
- 10)
-#define MESH_RETRANSMIT_TIME GNUNET_TIME_relative_multiply (\
- GNUNET_TIME_UNIT_SECONDS,\
- 5)
-
-#if MESH_DEBUG_CONNECTION
-#define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
-#else
-#define DEBUG_CONN(...)
-#endif
-
-#if MESH_DEBUG_DHT
-#define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
-#else
-#define DEBUG_DHT(...)
-#endif
-
-#if MESH_DEBUG_TIMING
-#include <time.h>
-double __sum;
-uint64_t __count;
-struct timespec __mesh_start;
-struct timespec __mesh_end;
-#define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
-#define INTERVAL_END \
-do {\
- clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
- double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
- if (__diff < 0) __diff += 1000000000;\
- __sum += __diff;\
- __count++;\
-} while (0)
-#define INTERVAL_SHOW \
-if (0 < __count)\
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
-#else
-#define INTERVAL_START
-#define INTERVAL_END
-#define INTERVAL_SHOW
-#endif
-
-/******************************************************************************/
-/************************ DATA STRUCTURES ****************************/
-/******************************************************************************/
-
-/** FWD declaration */
-struct MeshPeerInfo;
-struct MeshClient;
-
-
-/**
- * Struct containing info about a queued transmission to this peer
- */
-struct MeshPeerQueue
-{
- /**
- * DLL next
- */
- struct MeshPeerQueue *next;
-
- /**
- * DLL previous
- */
- struct MeshPeerQueue *prev;
-
- /**
- * Peer this transmission is directed to.
- */
- struct MeshPeerInfo *peer;
-
- /**
- * Tunnel this message belongs to.
- */
- struct MeshTunnel *tunnel;
-
- /**
- * Pointer to info stucture used as cls.
- */
- void *cls;
-
- /**
- * Type of message
- */
- uint16_t type;
-
- /**
- * Size of the message
- */
- size_t size;
-};
-
-
-/**
- * Struct containing all information regarding a given peer
- */
-struct MeshPeerInfo
-{
- /**
- * ID of the peer
- */
- GNUNET_PEER_Id id;
-
- /**
- * Last time we heard from this peer
- */
- struct GNUNET_TIME_Absolute last_contact;
-
- /**
- * Number of attempts to reconnect so far
- */
- int n_reconnect_attempts;
-
- /**
- * Paths to reach the peer, ordered by ascending hop count
- */
- struct MeshPeerPath *path_head;
-
- /**
- * Paths to reach the peer, ordered by ascending hop count
- */
- struct MeshPeerPath *path_tail;
-
- /**
- * Handle to stop the DHT search for a path to this peer
- */
- struct GNUNET_DHT_GetHandle *dhtget;
-
- /**
- * Array of tunnels this peer is the target of.
- * Most probably a small amount, therefore not a hashmap.
- * When the path to the peer changes, notify these tunnels to let them
- * re-adjust their path trees.
- */
- struct MeshTunnel **tunnels;
-
- /**
- * Number of tunnels this peers participates in
- */
- unsigned int ntunnels;
-
- /**
- * Transmission queue to core DLL head
- */
- struct MeshPeerQueue *queue_head;
-
- /**
- * Transmission queue to core DLL tail
- */
- struct MeshPeerQueue *queue_tail;
-
- /**
- * How many messages are in the queue to this peer.
- */
- unsigned int queue_n;
-
- /**
- * Handle for queued transmissions
- */
- struct GNUNET_CORE_TransmitHandle *core_transmit;
-};
-
-
-/**
- * Struct to encapsulate all the Flow Control information to a peer in the
- * context of a tunnel: Same peer in different tunnels will have independent
- * flow control structures, allowing to choke/free tunnels according to its
- * own criteria.
- */
-struct MeshFlowControl
-{
- /**
- * ID of the last packet sent towards the peer.
- */
- uint32_t last_pid_sent;
-
- /**
- * ID of the last packet received from the peer.
- */
- uint32_t last_pid_recv;
-
- /**
- * Last ACK sent to the peer (peer can't send more than this PID).
- */
- uint32_t last_ack_sent;
-
- /**
- * Last ACK sent towards the origin (for traffic towards leaf node).
- */
- uint32_t last_ack_recv;
-
- /**
- * How many payload messages are in the queue towards this peer.
- */
- uint32_t queue_n;
-
- /**
- * Task to poll the peer in case of a lost ACK causes stall.
- */
- GNUNET_SCHEDULER_TaskIdentifier poll_task;
-
- /**
- * How frequently to poll for ACKs.
- */
- struct GNUNET_TIME_Relative poll_time;
-
- /**
- * On which tunnel to poll.
- * Using an explicit poll_ctx would not help memory wise,
- * since the allocated context would have to be stored in the
- * fc struct in order to free it upon cancelling poll_task.
- */
- struct MeshTunnel *t;
-};
-
-
-/**
- * Globally unique tunnel identification (owner + number)
- * DO NOT USE OVER THE NETWORK
- */
-struct MESH_TunnelID
-{
- /**
- * Node that owns the tunnel
- */
- GNUNET_PEER_Id oid;
-
- /**
- * Tunnel number to differentiate all the tunnels owned by the node oid
- * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
- */
- MESH_TunnelNumber tid;
-};
-
-
-/**
- * Info needed to retry a message in case it gets lost.
- */
-struct MeshReliableMessage
-{
- /**
- * Double linked list, FIFO style
- */
- struct MeshReliableMessage *next;
- struct MeshReliableMessage *prev;
-
- /**
- * Tunnel Reliability queue this message is in.
- */
- struct MeshTunnelReliability *rel;
-
- /**
- * ID of the message (ACK needed to free)
- */
- uint32_t id;
-
- /**
- * When was this message issued (to calculate ACK delay) FIXME update with traffic
- */
- struct GNUNET_TIME_Absolute timestamp;
-
- /* struct GNUNET_MESH_Data with payload */
-};
-
-
-/**
- * Data needed for reliable tunnel endpoint retransmission management.
- */
-struct MeshTunnelReliability
-{
- /**
- * Tunnel this is about.
- */
- struct MeshTunnel *t;
-
- /**
- * DLL of messages sent and not yet ACK'd.
- */
- struct MeshReliableMessage *head_sent;
- struct MeshReliableMessage *tail_sent;
-
- /**
- * DLL of messages received out of order.
- */
- struct MeshReliableMessage *head_recv;
- struct MeshReliableMessage *tail_recv;
-
- /**
- * Task to resend/poll in case no ACK is received.
- */
- GNUNET_SCHEDULER_TaskIdentifier retry_task;
-
- /**
- * Counter for exponential backoff.
- */
- struct GNUNET_TIME_Relative retry_timer;
-
- /**
- * How long does it usually take to get an ACK. FIXME update with traffic
- */
- struct GNUNET_TIME_Relative expected_delay;
-};
-
-
-/**
- * Struct containing all information regarding a tunnel
- * For an intermediate node the improtant info used will be:
- * - id Tunnel unique identification
- * - paths[0] To know where to send it next
- * - metainfo: ready, speeds, accounting
- */
-struct MeshTunnel
-{
- /**
- * Tunnel ID
- */
- struct MESH_TunnelID id;
-
- /**
- * Port of the tunnel.
- */
- uint32_t port;
-
- /**
- * State of the tunnel.
- */
- enum MeshTunnelState state;
-
- /**
- * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
- */
- MESH_TunnelNumber local_tid;
-
- /**
- * Local tunnel number for local destination clients (incoming number)
- * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
- * number.
- */
- MESH_TunnelNumber local_tid_dest;
-
- /**
- * Is the tunnel bufferless (minimum latency)?
- */
- int nobuffer;
-
- /**
- * Is the tunnel reliable?
- */
- int reliable;
-
- /**
- * Force sending ACK? Flag to allow duplicate ACK on POLL.
- */
- int force_ack;
-
- /**
- * How many messages do we accept in the forward queue.
- */
- unsigned int queue_max;
-
- /**
- * Last time the tunnel was used
- */
- struct GNUNET_TIME_Absolute timestamp;
-
- /**
- * Destination of the tunnel.
- */
- GNUNET_PEER_Id dest;
-
- /**
- * Next hop in the tunnel. If 0, @c client must be set.
- */
- GNUNET_PEER_Id next_hop;
-
- /**
- * Previous hop in the tunnel. If 0, @c owner must be set.
- */
- GNUNET_PEER_Id prev_hop;
-
- /**
- * Flow control information about @c next_hop or @c client.
- */
- struct MeshFlowControl next_fc;
-
- /**
- * Flow control information about @c prev_hop or @c owner.
- */
- struct MeshFlowControl prev_fc;
-
- /**
- * Client owner of the tunnel, if any
- */
- struct MeshClient *owner;
-
- /**
- * Client destination of the tunnel, if any.
- */
- struct MeshClient *client;
-
- /**
- * Task to keep the used paths alive at the owner,
- * time tunnel out on all the other peers.
- */
- GNUNET_SCHEDULER_TaskIdentifier maintenance_task;
-
- /**
- * Path being used for the tunnel.
- */
- struct MeshPeerPath *path;
-
- /**
- * Flag to signal the destruction of the tunnel.
- * If this is set GNUNET_YES the tunnel will be destroyed
- * when the queue is empty.
- */
- int destroy;
-
- /**
- * Total messages pending for this tunnels, payload or not.
- */
- unsigned int pending_messages;
-
- /**
- * Reliability data.
- * Only present (non-NULL) at the owner of a tunnel.
- */
- struct MeshTunnelReliability *fwd_rel;
-
- /**
- * Reliability data.
- * Only present (non-NULL) at the destination of a tunnel.
- */
- struct MeshTunnelReliability *bck_rel;
-};
-
-
-/**
- * Struct containing information about a client of the service
- *
- * TODO: add a list of 'waiting' ports
- */
-struct MeshClient
-{
- /**
- * Linked list next
- */
- struct MeshClient *next;
-
- /**
- * Linked list prev
- */
- struct MeshClient *prev;
-
- /**
- * Tunnels that belong to this client, indexed by local id
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels;
-
- /**
- * Tunnels this client has accepted, indexed by incoming local id
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
-
- /**
- * Handle to communicate with the client
- */
- struct GNUNET_SERVER_Client *handle;
-
- /**
- * Ports that this client has declared interest in.
- * Indexed by port, contains *Client.
- */
- struct GNUNET_CONTAINER_MultiHashMap32 *ports;
-
- /**
- * Whether the client is active or shutting down (don't send confirmations
- * to a client that is shutting down.
- */
- int shutting_down;
-
- /**
- * ID of the client, mainly for debug messages
- */
- unsigned int id;
-
-};
-
-
-/******************************************************************************/
-/************************ DEBUG FUNCTIONS ****************************/
-/******************************************************************************/
-
-#if MESH_DEBUG
-/**
- * GNUNET_SCHEDULER_Task for printing a message after some operation is done
- * @param cls string to print
- * @param success GNUNET_OK if the PUT was transmitted,
- * GNUNET_NO on timeout,
- * GNUNET_SYSERR on disconnect from service
- * after the PUT message was transmitted
- * (so we don't know if it was received or not)
- */
-
-#if 0
-static void
-mesh_debug (void *cls, int success)
-{
- char *s = cls;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
-}
-#endif
-
-/* FIXME */
-unsigned int debug_fwd_ack;
-unsigned int debug_bck_ack;
-
-#endif
-
-/******************************************************************************/
-/*********************** GLOBAL VARIABLES ****************************/
-/******************************************************************************/
-
-/************************** Configuration parameters **************************/
-
-/**
- * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
- */
-static struct GNUNET_TIME_Relative refresh_path_time;
-
-/**
- * How often to PUT own ID in the DHT.
- */
-static struct GNUNET_TIME_Relative id_announce_time;
-
-/**
- * Maximum time allowed to connect to a peer found by string.
- */
-static struct GNUNET_TIME_Relative connect_timeout;
-
-/**
- * Default TTL for payload packets.
- */
-static unsigned long long default_ttl;
-
-/**
- * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
- */
-static unsigned long long dht_replication_level;
-
-/**
- * How many tunnels are we willing to maintain.
- * Local tunnels are always allowed, even if there are more tunnels than max.
- */
-static unsigned long long max_tunnels;
-
-/**
- * How many messages *in total* are we willing to queue, divided by number of
- * tunnels to get tunnel queue size.
- */
-static unsigned long long max_msgs_queue;
-
-/**
- * How many peers do we want to remember?
- */
-static unsigned long long max_peers;
-
-/**
- * Percentage of messages that will be dropped (for test purposes only).
- */
-static unsigned long long drop_percent;
-
-/*************************** Static global variables **************************/
-
-/**
- * DLL with all the clients, head.
- */
-static struct MeshClient *clients_head;
-
-/**
- * DLL with all the clients, tail.
- */
-static struct MeshClient *clients_tail;
-
-/**
- * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
- */
-static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
-
-/**
- * Number of tunnels known.
- */
-static unsigned long long n_tunnels;
-
-/**
- * Tunnels incoming, indexed by MESH_TunnelNumber
- * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
- */
-static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
-
-/**
- * Peers known, indexed by PeerIdentity (MeshPeerInfo).
- */
-static struct GNUNET_CONTAINER_MultiHashMap *peers;
-
-/*
- * Handle to communicate with transport
- */
-// static struct GNUNET_TRANSPORT_Handle *transport_handle;
-
-/**
- * Handle to communicate with core.
- */
-static struct GNUNET_CORE_Handle *core_handle;
-
-/**
- * Handle to use DHT.
- */
-static struct GNUNET_DHT_Handle *dht_handle;
-
-/**
- * Handle to server.
- */
-static struct GNUNET_SERVER_Handle *server_handle;
-
-/**
- * Handle to the statistics service.
- */
-static struct GNUNET_STATISTICS_Handle *stats;
-
-/**
- * Notification context, to send messages to local clients.
- */
-static struct GNUNET_SERVER_NotificationContext *nc;
-
-/**
- * Local peer own ID (memory efficient handle).
- */
-static GNUNET_PEER_Id myid;
-
-/**
- * Local peer own ID (full value).
- */
-static struct GNUNET_PeerIdentity my_full_id;
-
-/**
- * Own private key.
- */
-static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
-
-/**
- * Own public key.
- */
-static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
-
-/**
- * Tunnel ID for the next created tunnel (global tunnel number).
- */
-static MESH_TunnelNumber next_tid;
-
-/**
- * Tunnel ID for the next incoming tunnel (local tunnel number).
- */
-static MESH_TunnelNumber next_local_tid;
-
-/**
- * All ports clients of this peer have opened.
- */
-static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
-
-/**
- * Task to periodically announce itself in the network.
- */
-GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
-
-/**
- * Next ID to assign to a client.
- */
-unsigned int next_client_id;
-
-
-/******************************************************************************/
-/*********************** DECLARATIONS **************************/
-/******************************************************************************/
-
-/**
- * Function to process paths received for a new peer addition. The recorded
- * paths form the initial tunnel, which can be optimized later.
- * Called on each result obtained for the DHT search.
- *
- * @param cls closure
- * @param exp when will this value expire
- * @param key key of the result
- * @param type type of the result
- * @param size number of bytes in data
- * @param data pointer to the result data
- */
-static void
-dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
- const struct GNUNET_HashCode * key,
- const struct GNUNET_PeerIdentity *get_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
- size_t size, const void *data);
-
-
-/**
- * Retrieve the MeshPeerInfo stucture associated with the peer, create one
- * and insert it in the appropriate structures if the peer is not known yet.
- *
- * @param peer Full identity of the peer.
- *
- * @return Existing or newly created peer info.
- */
-static struct MeshPeerInfo *
-peer_get (const struct GNUNET_PeerIdentity *peer);
-
-
-/**
- * Retrieve the MeshPeerInfo stucture associated with the peer, create one
- * and insert it in the appropriate structures if the peer is not known yet.
- *
- * @param peer Short identity of the peer.
- *
- * @return Existing or newly created peer info.
- */
-static struct MeshPeerInfo *
-peer_get_short (const GNUNET_PEER_Id peer);
-
-
-/**
- * Build a PeerPath from the paths returned from the DHT, reversing the paths
- * to obtain a local peer -> destination path and interning the peer ids.
- *
- * @return Newly allocated and created path
- */
-static struct MeshPeerPath *
-path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int put_path_length);
-
-
-/**
- * Adds a path to the peer_infos of all the peers in the path
- *
- * @param p Path to process.
- * @param confirmed Whether we know if the path works or not.
- */
-static void
-path_add_to_peers (struct MeshPeerPath *p, int confirmed);
-
-
-
-/**
- * Search for a tunnel by global ID using full PeerIdentities.
- *
- * @param oid owner of the tunnel.
- * @param tid global tunnel number.
- *
- * @return tunnel handler, NULL if doesn't exist.
- */
-static struct MeshTunnel *
-tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
-
-
-/**
- * Notify a tunnel that a connection has broken that affects at least
- * some of its peers.
- *
- * @param t Tunnel affected.
- * @param p1 Peer that got disconnected from p2.
- * @param p2 Peer that got disconnected from p1.
- *
- * @return Short ID of the peer disconnected (either p1 or p2).
- * 0 if the tunnel remained unaffected.
- */
-static GNUNET_PEER_Id
-tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
- GNUNET_PEER_Id p2);
-
-
-/**
- * @brief Use the given path for the tunnel.
- * Update the next and prev hops (and RCs).
- * (Re)start the path refresh in case the tunnel is locally owned.
- *
- * @param t Tunnel to update.
- * @param p Path to use.
- */
-static void
-tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
-
-/**
- * Tunnel is empty: destroy it.
- *
- * Notifies all participants (peers, cleints) about the destruction.
- *
- * @param t Tunnel to destroy.
- */
-static void
-tunnel_destroy_empty (struct MeshTunnel *t);
-
-/**
- * @brief Queue and pass message to core when possible.
- *
- * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
- * and accounts for it. In case the queue is full, the message is dropped and
- * a break issued.
- *
- * Otherwise, message is treated as internal and allowed to go regardless of
- * queue status.
- *
- * @param cls Closure (@c type dependant). It will be used by queue_send to
- * build the message to be sent if not already prebuilt.
- * @param type Type of the message, 0 for a raw message.
- * @param size Size of the message.
- * @param dst Neighbor to send message to.
- * @param t Tunnel this message belongs to.
- */
-static void
-queue_add (void *cls, uint16_t type, size_t size,
- struct MeshPeerInfo *dst, struct MeshTunnel *t);
-
-
-/**
- * Free a transmission that was already queued with all resources
- * associated to the request.
- *
- * @param queue Queue handler to cancel.
- * @param clear_cls Is it necessary to free associated cls?
- */
-static void
-queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
-
-
-/**
- * @brief Get the next transmittable message from the queue.
- *
- * This will be the head, except in the case of being a data packet
- * not allowed by the destination peer.
- *
- * @param peer Destination peer.
- *
- * @return The next viable MeshPeerQueue element to send to that peer.
- * NULL when there are no transmittable messages.
- */
-struct MeshPeerQueue *
-queue_get_next (const struct MeshPeerInfo *peer);
-
-
-/**
- * Core callback to write a queued packet to core buffer
- *
- * @param cls Closure (peer info).
- * @param size Number of bytes available in buf.
- * @param buf Where the to write the message.
- *
- * @return number of bytes written to buf
- */
-static size_t
-queue_send (void *cls, size_t size, void *buf);
-
-
-/******************************************************************************/
-/************************ PERIODIC FUNCTIONS ****************************/
-/******************************************************************************/
-
-/**
- * Periodically announce self id in the DHT
- *
- * @param cls closure
- * @param tc task context
- */
-static void
-announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct PBlock block;
-
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- {
- announce_id_task = GNUNET_SCHEDULER_NO_TASK;
- return;
- }
- /* TODO
- * - Set data expiration in function of X
- * - Adapt X to churn
- */
- DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
-
- block.id = my_full_id;
- GNUNET_DHT_put (dht_handle, /* DHT handle */
- &my_full_id.hashPubKey, /* Key to use */
- dht_replication_level, /* Replication level */
- GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
- GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
- sizeof (block), /* Size of the data */
- (const char *) &block, /* Data itself */
- GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
- GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
- NULL, /* Continuation */
- NULL); /* Continuation closure */
- announce_id_task =
- GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
-}
-
-
-/******************************************************************************/
-/****************** GENERAL HELPER FUNCTIONS ************************/
-/******************************************************************************/
-
-
-/**
- * Check if client has registered with the service and has not disconnected
- *
- * @param client the client to check
- *
- * @return non-NULL if client exists in the global DLL
- */
-static struct MeshClient *
-client_get (struct GNUNET_SERVER_Client *client)
-{
- return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
-}
-
-
-/**
- * Deletes a tunnel from a client (either owner or destination). To be used on
- * tunnel destroy.
- *
- * @param c Client whose tunnel to delete.
- * @param t Tunnel which should be deleted.
- */
-static void
-client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
-{
- if (c == t->owner)
- {
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
- t->local_tid,
- t));
- }
- if (c == t->client)
- {
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
- t->local_tid_dest,
- t));
- }
-}
-
-/**
- * Notify the appropriate client that a new incoming tunnel was created.
- *
- * @param t Tunnel that was created.
- */
-static void
-send_client_tunnel_create (struct MeshTunnel *t)
-{
- struct GNUNET_MESH_TunnelMessage msg;
-
- if (NULL == t->client)
- return;
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
- msg.tunnel_id = htonl (t->local_tid_dest);
- msg.port = htonl (t->port);
- msg.options = 0;
- msg.options |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
- msg.options |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
- msg.options = htonl (msg.options);
- GNUNET_PEER_resolve (t->id.oid, &msg.peer);
- GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
- &msg.header, GNUNET_NO);
-}
-
-
-/**
- * Notify dest client that the incoming tunnel is no longer valid.
- *
- * @param c Client to notify..
- * @param t Tunnel that is destroyed.
- */
-static void
-send_client_tunnel_destroy (struct MeshClient *c, struct MeshTunnel *t)
-{
- struct GNUNET_MESH_TunnelMessage msg;
-
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
- if (c != t->client && c != t->owner)
- {
- GNUNET_break (0);
- return;
- }
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
- msg.tunnel_id = htonl (t->local_tid_dest);
- msg.port = htonl (0);
- memset(&msg.peer, 0, sizeof (msg.peer));
- GNUNET_SERVER_notification_context_unicast (nc, c->handle,
- &msg.header, GNUNET_NO);
-}
-
-
-/**
- * Iterator over all the peers to remove the oldest not-used entry.
- *
- * @param cls Closure (unsued).
- * @param key ID of the peer.
- * @param value Peer_Info of the peer.
- *
- * FIXME implement
- */
-static int
-peer_info_timeout (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
-{
- return GNUNET_YES;
-}
-
-/**
- * Retrieve the MeshPeerInfo stucture associated with the peer, create one
- * and insert it in the appropriate structures if the peer is not known yet.
- *
- * @param peer Full identity of the peer.
- *
- * @return Existing or newly created peer info.
- */
-static struct MeshPeerInfo *
-peer_get (const struct GNUNET_PeerIdentity *peer)
-{
- struct MeshPeerInfo *peer_info;
-
- peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
- if (NULL == peer_info)
- {
- peer_info =
- (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
- if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
- {
- GNUNET_CONTAINER_multihashmap_iterate (peers,
- &peer_info_timeout,
- NULL);
- }
- GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
- peer_info->id = GNUNET_PEER_intern (peer);
- }
- peer_info->last_contact = GNUNET_TIME_absolute_get();
-
- return peer_info;
-}
-
-
-/**
- * Retrieve the MeshPeerInfo stucture associated with the peer, create one
- * and insert it in the appropriate structures if the peer is not known yet.
- *
- * @param peer Short identity of the peer.
- *
- * @return Existing or newly created peer info.
- */
-static struct MeshPeerInfo *
-peer_get_short (const GNUNET_PEER_Id peer)
-{
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (peer, &id);
- return peer_get (&id);
-}
-
-
-/**
- * Choose the best path towards a peer considering the tunnel properties.
- *
- * @param peer The destination peer.
- * @param t The tunnel the path is for.
- *
- * @return Best current known path towards the peer, if any.
- */
-static struct MeshPeerPath *
-peer_get_best_path (const struct MeshPeerInfo *peer, const struct MeshTunnel *t)
-{
- struct MeshPeerPath *best_p;
- struct MeshPeerPath *p;
- unsigned int best_cost;
- unsigned int cost;
-
- best_p = p = peer->path_head;
- best_cost = cost = p->length;
- while (NULL != p)
- {
- if ((cost = p->length) < best_cost)
- {
- best_cost = cost;
- best_p = p;
- }
- p = p->next;
- }
- return best_p;
-}
-
-/**
- * Core callback to write a pre-constructed data packet to core buffer
- *
- * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
- * @param size Number of bytes available in buf.
- * @param buf Where the to write the message.
- *
- * @return number of bytes written to buf
- */
-static size_t
-send_core_data_raw (void *cls, size_t size, void *buf)
-{
- struct GNUNET_MessageHeader *msg = cls;
- size_t total_size;
-
- GNUNET_assert (NULL != msg);
- total_size = ntohs (msg->size);
-
- if (total_size > size)
- {
- GNUNET_break (0);
- return 0;
- }
- memcpy (buf, msg, total_size);
- GNUNET_free (cls);
- return total_size;
-}
-
-
-/**
- * Sends an already built message to a peer, properly registrating
- * all used resources.
- *
- * @param message Message to send. Function makes a copy of it.
- * @param peer Short ID of the neighbor whom to send the message.
- * @param t Tunnel on which this message is transmitted.
- */
-static void
-send_prebuilt_message (const struct GNUNET_MessageHeader *message,
- GNUNET_PEER_Id peer,
- struct MeshTunnel *t)
-{
- struct GNUNET_PeerIdentity id;
- struct MeshPeerInfo *neighbor;
- struct MeshPeerPath *p;
- void *data;
- size_t size;
- uint16_t type;
-
-// GNUNET_TRANSPORT_try_connect(); FIXME use?
-
- if (0 == peer)
- return;
-
- size = ntohs (message->size);
- data = GNUNET_malloc (size);
- memcpy (data, message, size);
- type = ntohs(message->type);
- if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
- GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
- {
- struct GNUNET_MESH_Data *u;
-
- u = (struct GNUNET_MESH_Data *) data;
- u->ttl = htonl (ntohl (u->ttl) - 1);
- }
- GNUNET_PEER_resolve (peer, &id);
- neighbor = peer_get (&id);
- for (p = neighbor->path_head; NULL != p; p = p->next)
- {
- if (2 >= p->length)
- {
- break;
- }
- }
- if (NULL == p)
- {
-#if MESH_DEBUG
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " %s IS NOT DIRECTLY CONNECTED\n",
- GNUNET_i2s(&id));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " PATHS TO %s:\n",
- GNUNET_i2s(&id));
- for (p = neighbor->path_head; NULL != p; p = p->next)
- {
- struct GNUNET_PeerIdentity debug_id;
- unsigned int i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " path with %u hops through:\n",
- p->length);
- for (i = 0; i < p->length; i++)
- {
- GNUNET_PEER_resolve(p->peers[i], &debug_id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " hop %u: %s\n",
- i, GNUNET_i2s(&debug_id));
- }
- }
-#endif
- GNUNET_break (0); // FIXME sometimes fails (testing disconnect?)
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- " no direct connection to %s\n",
- GNUNET_i2s (&id));
- GNUNET_free (data);
- return;
- }
- if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
- type = 0;
- queue_add (data,
- type,
- size,
- neighbor,
- t);
-}
-
-
-/**
- * Sends a CREATE PATH message for a path to a peer, properly registrating
- * all used resources.
- *
- * @param t Tunnel for which the path is created.
- */
-static void
-send_create_path (struct MeshTunnel *t)
-{
- struct MeshPeerInfo *neighbor;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
- neighbor = peer_get_short (t->next_hop);
- queue_add (t,
- GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
- sizeof (struct GNUNET_MESH_CreateTunnel) +
- (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
- neighbor,
- t);
- t->state = MESH_TUNNEL_WAITING;
-}
-
-
-/**
- * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
- *
- * @param t Tunnel which to confirm.
- */
-static void
-send_path_ack (struct MeshTunnel *t)
-{
- struct MeshPeerInfo *peer;
-
- peer = peer_get_short (t->prev_hop);
-
- queue_add (t,
- GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
- sizeof (struct GNUNET_MESH_PathACK),
- peer,
- t);
-}
-
-
-/**
- * Try to establish a new connection to this peer in the given tunnel.
- * If the peer doesn't have any path to it yet, try to get one.
- * If the peer already has some path, send a CREATE PATH towards it.
- *
- * @param peer PeerInfo of the peer.
- * @param t Tunnel for which to create the path, if possible.
- */
-static void
-peer_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
-{
- struct MeshPeerPath *p;
-
- if (NULL != peer->path_head)
- {
- p = peer_get_best_path (peer, t);
- tunnel_use_path (t, p);
- send_create_path (t);
- }
- else if (NULL == peer->dhtget)
- {
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (peer->id, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
- peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
- GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
- &id.hashPubKey, /* key to search */
- dht_replication_level, /* replication level */
- GNUNET_DHT_RO_RECORD_ROUTE |
- GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
- NULL, /* xquery */
- 0, /* xquery bits */
- &dht_get_id_handler, peer);
- t->state = MESH_TUNNEL_SEARCHING;
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "There is no path but the DHT GET is already started.\n");
- }
-}
-
-
-/**
- * Destroy the peer_info and free any allocated resources linked to it
- *
- * @param pi The peer_info to destroy.
- *
- * @return GNUNET_OK on success
- */
-static int
-peer_info_destroy (struct MeshPeerInfo *pi)
-{
- struct GNUNET_PeerIdentity id;
- struct MeshPeerPath *p;
- struct MeshPeerPath *nextp;
- unsigned int i;
-
- GNUNET_PEER_resolve (pi->id, &id);
- GNUNET_PEER_change_rc (pi->id, -1);
-
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
- {
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
- }
- if (NULL != pi->dhtget)
- {
- GNUNET_DHT_get_stop (pi->dhtget);
- }
- p = pi->path_head;
- while (NULL != p)
- {
- nextp = p->next;
- GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
- path_destroy (p);
- p = nextp;
- }
- for (i = 0; i < pi->ntunnels; i++)
- tunnel_destroy_empty (pi->tunnels[i]);
- GNUNET_array_grow (pi->tunnels, pi->ntunnels, 0);
- GNUNET_free (pi);
- return GNUNET_OK;
-}
-
-
-/**
- * Remove all paths that rely on a direct connection between p1 and p2
- * from the peer itself and notify all tunnels about it.
- *
- * @param peer PeerInfo of affected peer.
- * @param p1 GNUNET_PEER_Id of one peer.
- * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
- * no longer is.
- *
- * TODO: optimize (see below)
- */
-static void
-peer_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
- GNUNET_PEER_Id p2)
-{
- struct MeshPeerPath *p;
- struct MeshPeerPath *next;
- struct MeshPeerInfo *peer_d;
- GNUNET_PEER_Id d;
- unsigned int destroyed;
- unsigned int i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
- destroyed = 0;
- for (p = peer->path_head; NULL != p; p = next)
- {
- next = p->next;
- for (i = 0; i < (p->length - 1); i++)
- {
- if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
- (p->peers[i] == p2 && p->peers[i + 1] == p1))
- {
- GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
- path_destroy (p);
- destroyed++;
- break;
- }
- }
- }
- if (0 == destroyed)
- return;
-
- for (i = 0; i < peer->ntunnels; i++)
- {
- d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
- if (0 == d)
- continue;
-
- peer_d = peer_get_short (d);
- next = peer_get_best_path (peer_d, peer->tunnels[i]);
- tunnel_use_path (peer->tunnels[i], next);
- peer_connect (peer_d, peer->tunnels[i]);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
-}
-
-
-/**
- * Add the path to the peer and update the path used to reach it in case this
- * is the shortest.
- *
- * @param peer_info Destination peer to add the path to.
- * @param path New path to add. Last peer must be the peer in arg 1.
- * Path will be either used of freed if already known.
- * @param trusted Do we trust that this path is real?
- */
-void
-peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
- int trusted)
-{
- struct MeshPeerPath *aux;
- unsigned int l;
- unsigned int l2;
-
- if ((NULL == peer_info) || (NULL == path))
- {
- GNUNET_break (0);
- path_destroy (path);
- return;
- }
- if (path->peers[path->length - 1] != peer_info->id)
- {
- GNUNET_break (0);
- path_destroy (path);
- return;
- }
- if (2 >= path->length && GNUNET_NO == trusted)
- {
- /* Only allow CORE to tell us about direct paths */
- path_destroy (path);
- return;
- }
- for (l = 1; l < path->length; l++)
- {
- if (path->peers[l] == myid)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
- for (l2 = 0; l2 < path->length - l; l2++)
- {
- path->peers[l2] = path->peers[l + l2];
- }
- path->length -= l;
- l = 1;
- path->peers =
- GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
- }
- }
-#if MESH_DEBUG
- {
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (peer_info->id, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
- path->length, GNUNET_i2s (&id));
- }
-#endif
- l = path_get_length (path);
- if (0 == l)
- {
- path_destroy (path);
- return;
- }
-
- GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
- for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
- {
- l2 = path_get_length (aux);
- if (l2 > l)
- {
- GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
- peer_info->path_tail, aux, path);
- return;
- }
- else
- {
- if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
- {
- path_destroy (path);
- return;
- }
- }
- }
- GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
- path);
- return;
-}
-
-
-/**
- * Add the path to the origin peer and update the path used to reach it in case
- * this is the shortest.
- * The path is given in peer_info -> destination, therefore we turn the path
- * upside down first.
- *
- * @param peer_info Peer to add the path to, being the origin of the path.
- * @param path New path to add after being inversed.
- * Path will be either used or freed.
- * @param trusted Do we trust that this path is real?
- */
-static void
-peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
- struct MeshPeerPath *path, int trusted)
-{
- path_invert (path);
- peer_info_add_path (peer_info, path, trusted);
-}
-
-
-/**
- * Add a tunnel to the list of tunnels a peer participates in.
- * Update the tunnel's destination.
- *
- * @param p Peer to add to.
- * @param t Tunnel to add.
- */
-static void
-peer_info_add_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
-{
- if (0 != t->dest)
- {
- GNUNET_break (t->dest == p->id);
- return;
- }
- t->dest = p->id;
- GNUNET_PEER_change_rc (t->dest, 1);
- GNUNET_array_append (p->tunnels, p->ntunnels, t);
-}
-
-
-/**
- * Remove a tunnel from the list of tunnels a peer participates in.
- * Free the tunnel's destination.
- *
- * @param p Peer to clean.
- * @param t Tunnel to remove.
- */
-static void
-peer_info_remove_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
-{
- unsigned int i;
-
- if (t->dest == p->id)
- {
- GNUNET_PEER_change_rc (t->dest, -1);
- t->dest = 0;
- }
- for (i = 0; i < p->ntunnels; i++)
- {
- if (p->tunnels[i] == t)
- {
- p->tunnels[i] = p->tunnels[p->ntunnels - 1];
- GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
- return;
- }
- }
-}
-
-
-/**
- * Function called if the connection to the peer has been stalled for a while,
- * possibly due to a missed ACK. Poll the peer about its ACK status.
- *
- * @param cls Closure (poll ctx).
- * @param tc TaskContext.
- */
-static void
-tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshFlowControl *fc = cls;
- struct GNUNET_MESH_Poll msg;
- struct MeshTunnel *t = fc->t;
- GNUNET_PEER_Id peer;
-
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- {
- return;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
-
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
- msg.header.size = htons (sizeof (msg));
- msg.tid = htonl (t->id.tid);
- msg.pid = htonl (fc->last_pid_sent);
- GNUNET_PEER_resolve (t->id.oid, &msg.oid);
-
- if (fc == &t->prev_fc)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n");
- peer = t->prev_hop;
- }
- else if (fc == &t->next_fc)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n");
- peer = t->next_hop;
- }
- else
- {
- GNUNET_break (0);
- return;
- }
- send_prebuilt_message (&msg.header, peer, t);
- fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
- fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
- &tunnel_poll, fc);
-}
-
-
-/**
- * Build a PeerPath from the paths returned from the DHT, reversing the paths
- * to obtain a local peer -> destination path and interning the peer ids.
- *
- * @return Newly allocated and created path
- */
-static struct MeshPeerPath *
-path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int put_path_length)
-{
- struct MeshPeerPath *p;
- GNUNET_PEER_Id id;
- int i;
-
- p = path_new (1);
- p->peers[0] = myid;
- GNUNET_PEER_change_rc (myid, 1);
- i = get_path_length;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
- for (i--; i >= 0; i--)
- {
- id = GNUNET_PEER_intern (&get_path[i]);
- if (p->length > 0 && id == p->peers[p->length - 1])
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
- GNUNET_PEER_change_rc (id, -1);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
- GNUNET_i2s (&get_path[i]));
- p->length++;
- p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
- p->peers[p->length - 1] = id;
- }
- }
- i = put_path_length;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
- for (i--; i >= 0; i--)
- {
- id = GNUNET_PEER_intern (&put_path[i]);
- if (id == myid)
- {
- /* PUT path went through us, so discard the path up until now and start
- * from here to get a much shorter (and loop-free) path.
- */
- path_destroy (p);
- p = path_new (0);
- }
- if (p->length > 0 && id == p->peers[p->length - 1])
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
- GNUNET_PEER_change_rc (id, -1);
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
- GNUNET_i2s (&put_path[i]));
- p->length++;
- p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
- p->peers[p->length - 1] = id;
- }
- }
-#if MESH_DEBUG
- if (get_path_length > 0)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
- GNUNET_i2s (&get_path[0]));
- if (put_path_length > 0)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
- GNUNET_i2s (&put_path[0]));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
- p->length);
- for (i = 0; i < p->length; i++)
- {
- struct GNUNET_PeerIdentity peer_id;
-
- GNUNET_PEER_resolve (p->peers[i], &peer_id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
- GNUNET_i2s (&peer_id));
- }
-#endif
- return p;
-}
-
-
-/**
- * Adds a path to the peer_infos of all the peers in the path
- *
- * @param p Path to process.
- * @param confirmed Whether we know if the path works or not.
- */
-static void
-path_add_to_peers (struct MeshPeerPath *p, int confirmed)
-{
- unsigned int i;
-
- /* TODO: invert and add */
- for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
- for (i++; i < p->length; i++)
- {
- struct MeshPeerInfo *aux;
- struct MeshPeerPath *copy;
-
- aux = peer_get_short (p->peers[i]);
- copy = path_duplicate (p);
- copy->length = i + 1;
- peer_info_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
- }
-}
-
-
-/**
- * Send keepalive packets for a peer
- *
- * @param cls Closure (tunnel for which to send the keepalive).
- * @param tc Notification context.
- */
-static void
-path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
-
-
-/**
- * Search for a tunnel among the incoming tunnels
- *
- * @param tid the local id of the tunnel
- *
- * @return tunnel handler, NULL if doesn't exist
- */
-static struct MeshTunnel *
-tunnel_get_incoming (MESH_TunnelNumber tid)
-{
- GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
- return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid);
-}
-
-
-/**
- * Search for a tunnel among the tunnels for a client
- *
- * @param c the client whose tunnels to search in
- * @param tid the local id of the tunnel
- *
- * @return tunnel handler, NULL if doesn't exist
- */
-static struct MeshTunnel *
-tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
-{
- if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
- {
- return tunnel_get_incoming (tid);
- }
- else
- {
- GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI);
- return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid);
- }
-}
-
-
-/**
- * Search for a tunnel by global ID using PEER_ID
- *
- * @param pi owner of the tunnel
- * @param tid global tunnel number
- *
- * @return tunnel handler, NULL if doesn't exist
- */
-static struct MeshTunnel *
-tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
-{
- struct MESH_TunnelID id;
- struct GNUNET_HashCode hash;
-
- id.oid = pi;
- id.tid = tid;
-
- GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
- return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
-}
-
-
-/**
- * Search for a tunnel by global ID using full PeerIdentities
- *
- * @param oid owner of the tunnel
- * @param tid global tunnel number
- *
- * @return tunnel handler, NULL if doesn't exist
- */
-static struct MeshTunnel *
-tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
-{
- return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
-}
-
-
-/**
- * Add a client to a tunnel, initializing all needed data structures.
- *
- * @param t Tunnel to which add the client.
- * @param c Client which to add to the tunnel.
- */
-static void
-tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
-{
- if (NULL != t->client)
- {
- GNUNET_break(0);
- return;
- }
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels,
- t->local_tid_dest, t,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
- {
- GNUNET_break (0);
- return;
- }
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels,
- t->local_tid_dest, t,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
- {
- GNUNET_break (0);
- return;
- }
- t->client = c;
-}
-
-
-static void
-tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
-{
- unsigned int own_pos;
-
- for (own_pos = 0; own_pos < p->length; own_pos++)
- {
- if (p->peers[own_pos] == myid)
- break;
- }
- if (own_pos > p->length - 1)
- {
- GNUNET_break (0);
- return;
- }
-
- if (own_pos < p->length - 1)
- t->next_hop = p->peers[own_pos + 1];
- else
- t->next_hop = p->peers[own_pos];
- GNUNET_PEER_change_rc (t->next_hop, 1);
- if (0 < own_pos)
- t->prev_hop = p->peers[own_pos - 1];
- else
- t->prev_hop = p->peers[0];
- GNUNET_PEER_change_rc (t->prev_hop, 1);
-
- if (NULL != t->path)
- path_destroy (t->path);
- t->path = path_duplicate (p);
- if (0 == own_pos)
- {
- if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
- GNUNET_SCHEDULER_cancel (t->maintenance_task);
- t->maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
- &path_refresh, t);
- }
-}
-
-
-/**
- * Notifies a tunnel that a connection has broken that affects at least
- * some of its peers. Sends a notification towards the root of the tree.
- * In case the peer is the owner of the tree, notifies the client that owns
- * the tunnel and tries to reconnect.
- *
- * @param t Tunnel affected.
- * @param p1 Peer that got disconnected from p2.
- * @param p2 Peer that got disconnected from p1.
- *
- * @return Short ID of the peer disconnected (either p1 or p2).
- * 0 if the tunnel remained unaffected.
- */
-static GNUNET_PEER_Id
-tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
- GNUNET_PEER_Id p2)
-{
-// if (myid != p1 && myid != p2) FIXME
-// {
-// return;
-// }
-//
-// if (tree_get_predecessor (t->tree) != 0)
-// {
-// /* We are the peer still connected, notify owner of the disconnection. */
-// struct GNUNET_MESH_PathBroken msg;
-// struct GNUNET_PeerIdentity neighbor;
-//
-// msg.header.size = htons (sizeof (msg));
-// msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
-// GNUNET_PEER_resolve (t->id.oid, &msg.oid);
-// msg.tid = htonl (t->id.tid);
-// msg.peer1 = my_full_id;
-// GNUNET_PEER_resolve (pid, &msg.peer2);
-// GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
-// send_prebuilt_message (&msg.header, &neighbor, t);
-// }
- return 0;
-}
-
-
-/**
- * Build a local ACK message and send it to a local client.
- *
- * @param t Tunnel on which to send the ACK.
- * @param c Client to whom send the ACK.
- * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
- */
-static void
-send_local_ack (struct MeshTunnel *t,
- struct MeshClient *c,
- int is_fwd)
-{
- struct GNUNET_MESH_LocalAck msg;
-
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
- msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
- GNUNET_SERVER_notification_context_unicast (nc,
- c->handle,
- &msg.header,
- GNUNET_NO);
-}
-
-/**
- * Build an ACK message and queue it to send to the given peer.
- *
- * @param t Tunnel on which to send the ACK.
- * @param peer Peer to whom send the ACK.
- * @param ack Value of the ACK.
- */
-static void
-send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
-{
- struct GNUNET_MESH_ACK msg;
-
- GNUNET_PEER_resolve (t->id.oid, &msg.oid);
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
- msg.pid = htonl (ack);
- msg.tid = htonl (t->id.tid);
-
- send_prebuilt_message (&msg.header, peer, t);
-}
-
-
-/**
- * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
- *
- * @param t Tunnel this is about.
- */
-static void
-tunnel_send_fwd_data_ack (struct MeshTunnel *t)
-{
- struct GNUNET_MESH_DataACK msg;
-
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK);
- msg.header.size = htons (sizeof (msg));
- msg.tid = htonl (t->id.tid);
- GNUNET_PEER_resolve (t->id.oid, &msg.oid);
- msg.pid = htonl (t->prev_fc.last_pid_recv);
- msg.futures = 0; // FIXME set bits of other newer messages received
-
- send_prebuilt_message (&msg.header, t->prev_hop, t);
-}
-
-
-/**
- * Send an end-to-end BCK ACK message for the most recent in-sequence payload.
- *
- * @param t Tunnel this is about.
- */
-static void
-tunnel_send_bck_data_ack (struct MeshTunnel *t)
-{
- struct GNUNET_MESH_DataACK msg;
-
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
- msg.header.size = htons (sizeof (msg));
- msg.tid = htonl (t->id.tid);
- GNUNET_PEER_resolve (t->id.oid, &msg.oid);
- msg.pid = htonl (t->next_fc.last_pid_recv);
- msg.futures = 0; // FIXME set bits of other newer messages received
-
- send_prebuilt_message (&msg.header, t->next_hop, t);
-}
-
-
-/**
- * Send an ACK informing the predecessor about the available buffer space.
- * In case there is no predecessor, inform the owning client.
- * If buffering is off, send only on behalf of children or self if endpoint.
- * If buffering is on, send when sent to children and buffer space is free.
- * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
- * the ACK itself goes "back" (towards root).
- *
- * @param t Tunnel on which to send the ACK.
- * @param type Type of message that triggered the ACK transmission.
- */
-static void
-tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type)
-{
- uint32_t ack;
-
- /* Is it after unicast retransmission? */
- switch (type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "ACK due to FWD DATA retransmission\n");
- if (GNUNET_YES == t->nobuffer)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
- return;
- }
- if (GNUNET_YES == t->reliable && NULL != t->client)
- tunnel_send_fwd_data_ack (t);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- if (NULL != t->owner && GNUNET_YES == t->reliable)
- return;
- case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
- break;
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
- tunnel_send_fwd_data_ack (t);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
- t->force_ack = GNUNET_YES;
- break;
- default:
- GNUNET_break (0);
- }
-
- /* Check if we need to transmit the ACK */
- if (NULL == t->owner &&
- t->queue_max > t->next_fc.queue_n * 4 &&
- GMC_is_pid_bigger(t->prev_fc.last_ack_sent, t->prev_fc.last_pid_recv) &&
- GNUNET_NO == t->force_ack)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, buffer free\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " t->qmax: %u, t->qn: %u\n",
- t->queue_max, t->next_fc.queue_n);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " t->pid: %u, t->ack: %u\n",
- t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
- return;
- }
-
- /* Ok, ACK might be necessary, what PID to ACK? */
- ack = t->prev_fc.last_pid_recv + t->queue_max - t->next_fc.queue_n;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK %u\n", ack);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " last %u, qmax %u, q %u\n",
- t->prev_fc.last_pid_recv, t->queue_max, t->next_fc.queue_n);
- if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
- return;
- }
-
- t->prev_fc.last_ack_sent = ack;
- if (NULL != t->owner)
- send_local_ack (t, t->owner, GNUNET_YES);
- else if (0 != t->prev_hop)
- send_ack (t, t->prev_hop, ack);
- else
- GNUNET_break (0);
- debug_fwd_ack++;
- t->force_ack = GNUNET_NO;
-}
-
-
-/**
- * Send an ACK informing the children node/client about the available
- * buffer space.
- * If buffering is off, send only on behalf of root (can be self).
- * If buffering is on, send when sent to predecessor and buffer space is free.
- * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
- * the ACK itself goes "forward" (towards children/clients).
- *
- * @param t Tunnel on which to send the ACK.
- * @param type Type of message that triggered the ACK transmission.
- */
-static void
-tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
-{
- uint32_t ack;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending BCK ACK on tunnel %u [%u] due to %s\n",
- t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
- /* Is it after data to_origin retransmission? */
- switch (type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
- if (GNUNET_YES == t->nobuffer)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Not sending ACK, nobuffer + traffic\n");
- return;
- }
- break;
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- /* Why was this here?!
- * This prevents the destination from starting traffic to the origin
- */
-// if (NULL != t->client && GNUNET_YES == t->reliable)
-// return;
- case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
- break;
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
- tunnel_send_bck_data_ack (t);
- /* fall through */
- case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- t->force_ack = GNUNET_YES;
- break;
- default:
- GNUNET_break (0);
- }
-
- /* TODO: Check if we need to transmit the ACK (as in fwd) */
-
- ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
-
- if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Not sending ACK, not needed, last ack sent was %u\n",
- t->next_fc.last_ack_sent);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Sending BCK ACK %u (last sent: %u)\n",
- ack, t->next_fc.last_ack_sent);
- t->next_fc.last_ack_sent = ack;
-
- if (NULL != t->client)
- send_local_ack (t, t->client, GNUNET_NO);
- else if (0 != t->next_hop)
- send_ack (t, t->next_hop, ack);
- else
- GNUNET_break (0);
- t->force_ack = GNUNET_NO;
-}
-
-
-/**
- * Modify the mesh message TID from global to local and send to client.
- *
- * @param t Tunnel on which to send the message.
- * @param msg Message to modify and send.
- * @param c Client to send to.
- * @param tid Tunnel ID to use (c can be both owner and client).
- */
-static void
-tunnel_send_client_data (struct MeshTunnel *t,
- const struct GNUNET_MESH_Data *msg,
- struct MeshClient *c, MESH_TunnelNumber tid)
-{
- struct GNUNET_MESH_LocalData *copy;
- uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
- char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
-
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break_op (0);
- return;
- }
- if (NULL == c)
- {
- GNUNET_break (0);
- return;
- }
- copy = (struct GNUNET_MESH_LocalData *) cbuf;
- memcpy (©[1], &msg[1], size);
- copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
- copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
- copy->tid = htonl (tid);
- GNUNET_SERVER_notification_context_unicast (nc, c->handle,
- ©->header, GNUNET_NO);
-}
-
-/**
- * Modify the unicast message TID from global to local and send to client.
- *
- * @param t Tunnel on which to send the message.
- * @param msg Message to modify and send.
- */
-static void
-tunnel_send_client_ucast (struct MeshTunnel *t,
- const struct GNUNET_MESH_Data *msg)
-{
- tunnel_send_client_data (t, msg, t->client, t->local_tid_dest);
-}
-
-
-/**
- * Modify the to_origin message TID from global to local and send to client.
- *
- * @param t Tunnel on which to send the message.
- * @param msg Message to modify and send.
- */
-static void
-tunnel_send_client_to_orig (struct MeshTunnel *t,
- const struct GNUNET_MESH_Data *msg)
-{
- tunnel_send_client_data (t, msg, t->owner, t->local_tid);
-}
-
-
-/**
- * We haven't received an ACK after a certain time: restransmit the message.
- *
- * @param cls Closure (MeshReliableMessage with the message to restransmit)
- * @param tc TaskContext.
- */
-static void
-tunnel_retransmit_message (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshTunnelReliability *rel = cls;
- struct MeshReliableMessage *copy;
- struct MeshTunnel *t;
- struct GNUNET_MESH_Data *payload;
- GNUNET_PEER_Id hop;
-
- rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
-
- t = rel->t;
- copy = rel->head_sent;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->id);
-
- payload = (struct GNUNET_MESH_Data *) ©[1];
- hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
- send_prebuilt_message (&payload->header, hop, t);
- GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
- rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer); // FIXME adapt
- rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
- &tunnel_retransmit_message,
- cls);
-}
-
-
-/**
- * @brief Re-initiate traffic to this peer if necessary.
- *
- * Check if there is traffic queued towards this peer
- * and the core transmit handle is NULL (traffic was stalled).
- * If so, call core tmt rdy.
- *
- * @param peer_id Short ID of peer to which initiate traffic.
- */
-static void
-peer_unlock_queue(GNUNET_PEER_Id peer_id)
-{
- struct MeshPeerInfo *peer;
- struct GNUNET_PeerIdentity id;
- struct MeshPeerQueue *q;
- size_t size;
-
- peer = peer_get_short (peer_id);
- if (NULL != peer->core_transmit)
- return;
-
- q = queue_get_next (peer);
- if (NULL == q)
- {
- /* Might br multicast traffic already sent to this particular peer but
- * not to other children in this tunnel.
- * This way t->queue_n would be > 0 but the queue of this particular peer
- * would be empty.
- */
- return;
- }
- size = q->size;
- GNUNET_PEER_resolve (peer->id, &id);
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready(core_handle,
- 0,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &id,
- size,
- &queue_send,
- peer);
- return;
-}
-
-
-/**
- * Send a message to all peers and clients in this tunnel that the tunnel
- * is no longer valid. If some peer or client should not receive the message,
- * should be zero'ed out before calling this function.
- *
- * @param t The tunnel whose peers and clients to notify.
- */
-static void
-tunnel_send_destroy (struct MeshTunnel *t)
-{
- struct GNUNET_MESH_TunnelDestroy msg;
- struct GNUNET_PeerIdentity id;
-
- msg.header.size = htons (sizeof (msg));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
- GNUNET_PEER_resolve (t->id.oid, &msg.oid);
- msg.tid = htonl (t->id.tid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " sending tunnel destroy for tunnel: %s [%X]\n",
- GNUNET_i2s (&msg.oid), t->id.tid);
-
- if (NULL == t->client && 0 != t->next_hop)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
- GNUNET_PEER_resolve (t->next_hop, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " sending forward to %s\n",
- GNUNET_i2s (&id));
- send_prebuilt_message (&msg.header, t->next_hop, t);
- }
- if (NULL == t->owner && 0 != t->prev_hop)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
- GNUNET_PEER_resolve (t->prev_hop, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " sending back to %s\n",
- GNUNET_i2s (&id));
- send_prebuilt_message (&msg.header, t->prev_hop, t);
- }
- if (NULL != t->owner)
- {
- send_client_tunnel_destroy (t->owner, t);
- }
- if (NULL != t->client)
- {
- send_client_tunnel_destroy (t->client, t);
- }
-}
-
-
-/**
- * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
- *
- * @param t Tunnel which to cancel.
- * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
- */
-static void
-peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
-{
- struct MeshPeerInfo *peer_info;
- struct MeshPeerQueue *pq;
- struct MeshPeerQueue *next;
-
- if (0 == neighbor)
- return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
- peer_info = peer_get_short (neighbor);
- for (pq = peer_info->queue_head; NULL != pq; pq = next)
- {
- next = pq->next;
- if (pq->tunnel == t)
- {
- if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
- GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
- {
- /* Should have been removed on destroy children */
- GNUNET_break (0);
- }
- queue_destroy (pq, GNUNET_YES);
- }
- }
- if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
- {
- GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
- peer_info->core_transmit = NULL;
- }
-}
-
-
-/**
- * Destroy the tunnel.
- *
- * This function does not generate any warning traffic to clients or peers.
- *
- * Tasks:
- * Remove the tunnel from peer_info's and clients' hashmaps.
- * Cancel messages belonging to this tunnel queued to neighbors.
- * Free any allocated resources linked to the tunnel.
- *
- * @param t the tunnel to destroy
- *
- * @return GNUNET_OK on success
- */
-static int
-tunnel_destroy (struct MeshTunnel *t)
-{
- struct MeshClient *c;
- struct GNUNET_HashCode hash;
- int r;
-
- if (NULL == t)
- return GNUNET_OK;
-
- r = GNUNET_OK;
- c = t->owner;
-#if MESH_DEBUG
- {
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (t->id.oid, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
- GNUNET_i2s (&id), t->id.tid);
- if (NULL != c)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
- }
-#endif
-
- GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
- if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
- {
- GNUNET_break (0);
- r = GNUNET_SYSERR;
- }
-
- if (NULL != c)
- {
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t))
- {
- GNUNET_break (0);
- r = GNUNET_SYSERR;
- }
- }
-
- if (NULL != t->client)
- {
- c = t->client;
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
- t->local_tid_dest, t))
- {
- GNUNET_break (0);
- r = GNUNET_SYSERR;
- }
- if (GNUNET_YES !=
- GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
- t->local_tid_dest, t))
- {
- GNUNET_break (0);
- r = GNUNET_SYSERR;
- }
- }
-
- if (0 != t->prev_hop)
- {
- peer_cancel_queues (t->prev_hop, t);
- GNUNET_PEER_change_rc (t->prev_hop, -1);
- }
- if (0 != t->next_hop)
- {
- peer_cancel_queues (t->next_hop, t);
- GNUNET_PEER_change_rc (t->next_hop, -1);
- }
- if (0 != t->dest) {
- peer_info_remove_tunnel (peer_get_short (t->dest), t);
- }
-
- if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
- GNUNET_SCHEDULER_cancel (t->maintenance_task);
-
- n_tunnels--;
- GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
- path_destroy (t->path);
- GNUNET_free (t);
- return r;
-}
-
-/**
- * Tunnel is empty: destroy it.
- *
- * Notifies all participants (peers, cleints) about the destruction.
- *
- * @param t Tunnel to destroy.
- */
-static void
-tunnel_destroy_empty (struct MeshTunnel *t)
-{
- #if MESH_DEBUG
- {
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (t->id.oid, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "executing destruction of empty tunnel %s [%X]\n",
- GNUNET_i2s (&id), t->id.tid);
- }
- #endif
-
- if (GNUNET_NO == t->destroy)
- tunnel_send_destroy (t);
- if (0 == t->pending_messages)
- tunnel_destroy (t);
- else
- t->destroy = GNUNET_YES;
-}
-
-/**
- * Initialize a Flow Control structure to the initial state.
- *
- * @param fc Flow Control structure to initialize.
- */
-static void
-fc_init (struct MeshFlowControl *fc)
-{
- fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
- fc->last_pid_recv = (uint32_t) -1;
- fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
- fc->last_ack_recv = (uint32_t) -1;
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
- fc->queue_n = 0;
-}
-
-/**
- * Create a new tunnel
- *
- * @param owner Who is the owner of the tunnel (short ID).
- * @param tid Tunnel Number of the tunnel.
- * @param client Clients that owns the tunnel, NULL for foreign tunnels.
- * @param local Tunnel Number for the tunnel, for the client point of view.
- *
- * @return A new initialized tunnel. NULL on error.
- */
-static struct MeshTunnel *
-tunnel_new (GNUNET_PEER_Id owner,
- MESH_TunnelNumber tid,
- struct MeshClient *client,
- MESH_TunnelNumber local)
-{
- struct MeshTunnel *t;
- struct GNUNET_HashCode hash;
-
- if (n_tunnels >= max_tunnels && NULL == client)
- return NULL;
-
- t = GNUNET_malloc (sizeof (struct MeshTunnel));
- t->id.oid = owner;
- t->id.tid = tid;
- t->queue_max = (max_msgs_queue / max_tunnels) + 1;
- t->owner = client;
- fc_init (&t->next_fc);
- fc_init (&t->prev_fc);
- t->local_tid = local;
- n_tunnels++;
- GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
-
- GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- GNUNET_break (0);
- tunnel_destroy (t);
- if (NULL != client)
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
- }
- return NULL;
- }
-
- if (NULL != client)
- {
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
- t->local_tid, t,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
- {
- tunnel_destroy (t);
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
- return NULL;
- }
- }
-
- return t;
-}
-
-
-/**
- * Set options in a tunnel, extracted from a bit flag field
- *
- * @param t Tunnel to set options to.
- * @param options Bit array in host byte order.
- */
-static void
-tunnel_set_options (struct MeshTunnel *t, uint32_t options)
-{
- t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
- GNUNET_YES : GNUNET_NO;
- t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
- GNUNET_YES : GNUNET_NO;
-}
-
-
-/**
- * Iterator for deleting each tunnel whose client endpoint disconnected.
- *
- * @param cls Closure (client that has disconnected).
- * @param key The local tunnel id (used to access the hashmap).
- * @param value The value stored at the key (tunnel to destroy).
- *
- * @return GNUNET_OK, keep iterating.
- */
-static int
-tunnel_destroy_iterator (void *cls,
- uint32_t key,
- void *value)
-{
- struct MeshTunnel *t = value;
- struct MeshClient *c = cls;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Tunnel %X / %X destroy, due to client %u shutdown.\n",
- t->local_tid, t->local_tid_dest, c->id);
- client_delete_tunnel (c, t);
- if (c == t->client)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
- t->client = NULL;
- if (0 != t->next_hop) { /* destroy could come before a path is used */
- GNUNET_PEER_change_rc (t->next_hop, -1);
- t->next_hop = 0;
- }
- }
- if (c == t->owner)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
- t->owner = NULL;
- if (0 != t->prev_hop) { /* destroy could come before a path is used */
- GNUNET_PEER_change_rc (t->prev_hop, -1);
- t->prev_hop = 0;
- }
- }
-
- tunnel_destroy_empty (t);
-
- return GNUNET_OK;
-}
-
-
-/**
- * Timeout function, destroys tunnel if called
- *
- * @param cls Closure (tunnel to destroy).
- * @param tc TaskContext
- */
-static void
-tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshTunnel *t = cls;
- struct GNUNET_PeerIdentity id;
-
- t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
- GNUNET_PEER_resolve(t->id.oid, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Tunnel %s [%X] timed out. Destroying.\n",
- GNUNET_i2s(&id), t->id.tid);
- if (NULL != t->client)
- send_client_tunnel_destroy (t->client, t);
- tunnel_destroy (t); /* Do not notify other */
-}
-
-
-/**
- * Resets the tunnel timeout. Starts it if no timeout was running.
- *
- * @param t Tunnel whose timeout to reset.
- *
- * TODO use heap to improve efficiency of scheduler.
- */
-static void
-tunnel_reset_timeout (struct MeshTunnel *t)
-{
- if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
- return;
- if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
- GNUNET_SCHEDULER_cancel (t->maintenance_task);
- t->maintenance_task =
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
- (refresh_path_time, 4), &tunnel_timeout, t);
-}
-
-
-/******************************************************************************/
-/**************** MESH NETWORK HANDLER HELPERS ***********************/
-/******************************************************************************/
-
-/**
- * Function to send a create path packet to a peer.
- *
- * @param cls closure
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
-static size_t
-send_core_path_create (void *cls, size_t size, void *buf)
-{
- struct MeshTunnel *t = cls;
- struct GNUNET_MESH_CreateTunnel *msg;
- struct GNUNET_PeerIdentity *peer_ptr;
- struct MeshPeerPath *p = t->path;
- size_t size_needed;
- uint32_t opt;
- int i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
- size_needed =
- sizeof (struct GNUNET_MESH_CreateTunnel) +
- p->length * sizeof (struct GNUNET_PeerIdentity);
-
- if (size < size_needed || NULL == buf)
- {
- GNUNET_break (0);
- return 0;
- }
- msg = (struct GNUNET_MESH_CreateTunnel *) buf;
- msg->header.size = htons (size_needed);
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
- msg->tid = ntohl (t->id.tid);
-
- opt = 0;
- if (GNUNET_YES == t->nobuffer)
- opt |= GNUNET_MESH_OPTION_NOBUFFER;
- if (GNUNET_YES == t->reliable)
- opt |= GNUNET_MESH_OPTION_RELIABLE;
- msg->opt = htonl (opt);
- msg->port = htonl (t->port);
-
- peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
- for (i = 0; i < p->length; i++)
- {
- GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "CREATE PATH (%u bytes long) sent!\n", size_needed);
- return size_needed;
-}
-
-
-/**
- * Creates a path ack message in buf and frees all unused resources.
- *
- * @param cls closure (MeshTransmissionDescriptor)
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
-static size_t
-send_core_path_ack (void *cls, size_t size, void *buf)
-{
- struct MeshTunnel *t = cls;
- struct GNUNET_MESH_PathACK *msg = buf;
-
- GNUNET_assert (NULL != t);
- if (sizeof (struct GNUNET_MESH_PathACK) > size)
- {
- GNUNET_break (0);
- return 0;
- }
- t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
- msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
- GNUNET_PEER_resolve (t->id.oid, &msg->oid);
- msg->tid = htonl (t->id.tid);
- msg->peer_id = my_full_id;
- msg->ack = htonl (t->prev_fc.last_ack_sent);
-
- /* TODO add signature */
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
- return sizeof (struct GNUNET_MESH_PathACK);
-}
-
-
-/**
- * Free a transmission that was already queued with all resources
- * associated to the request.
- *
- * @param queue Queue handler to cancel.
- * @param clear_cls Is it necessary to free associated cls?
- */
-static void
-queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
-{
- struct MeshFlowControl *fc;
-
- if (GNUNET_YES == clear_cls)
- {
- switch (queue->type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
- GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
- /* fall through */
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " prebuilt message\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " type %s\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- break;
- case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
- break;
- default:
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- " type %s unknown!\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- }
- GNUNET_free_non_null (queue->cls);
- }
- GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
- queue->peer->queue_tail,
- queue);
-
- /* Delete from appropriate fc in the tunnel */
- if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
- GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
- {
- if (queue->peer->id == queue->tunnel->prev_hop)
- fc = &queue->tunnel->prev_fc;
- else if (queue->peer->id == queue->tunnel->next_hop)
- fc = &queue->tunnel->next_fc;
- else
- {
- GNUNET_break (0);
- GNUNET_free (queue);
- return;
- }
- fc->queue_n--;
- }
- GNUNET_free (queue);
-}
-
-
-/**
- * @brief Get the next transmittable message from the queue.
- *
- * This will be the head, except in the case of being a data packet
- * not allowed by the destination peer.
- *
- * @param peer Destination peer.
- *
- * @return The next viable MeshPeerQueue element to send to that peer.
- * NULL when there are no transmittable messages.
- */
-struct MeshPeerQueue *
-queue_get_next (const struct MeshPeerInfo *peer)
-{
- struct MeshPeerQueue *q;
-
- struct GNUNET_MESH_Data *dmsg;
- struct MeshTunnel* t;
- uint32_t pid;
- uint32_t ack;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
- for (q = peer->queue_head; NULL != q; q = q->next)
- {
- t = q->tunnel;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* %s\n",
- GNUNET_MESH_DEBUG_M2S (q->type));
- dmsg = (struct GNUNET_MESH_Data *) q->cls;
- pid = ntohl (dmsg->pid);
- switch (q->type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
- ack = t->next_fc.last_ack_recv;
- break;
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
- ack = t->prev_fc.last_ack_recv;
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* OK!\n");
- return q;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* ACK: %u, PID: %u\n",
- ack, pid);
- if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* OK!\n");
- return q;
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* NEXT!\n");
- }
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* nothing found\n");
- return NULL;
-}
-
-
-static size_t
-queue_send (void *cls, size_t size, void *buf)
-{
- struct MeshPeerInfo *peer = cls;
- struct GNUNET_MessageHeader *msg;
- struct MeshPeerQueue *queue;
- struct MeshTunnel *t;
- struct GNUNET_PeerIdentity dst_id;
- struct MeshFlowControl *fc;
- size_t data_size;
- uint32_t pid;
- uint16_t type;
-
- peer->core_transmit = NULL;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
- queue = queue_get_next (peer);
-
- /* Queue has no internal mesh traffic nor sendable payload */
- if (NULL == queue)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
- if (NULL == peer->queue_head)
- GNUNET_break (0); /* Core tmt_rdy should've been canceled */
- return 0;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
-
- GNUNET_PEER_resolve (peer->id, &dst_id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* towards %s\n",
- GNUNET_i2s (&dst_id));
- /* Check if buffer size is enough for the message */
- if (queue->size > size)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* not enough room, reissue\n");
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready (core_handle,
- GNUNET_NO,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &dst_id,
- queue->size,
- &queue_send,
- peer);
- return 0;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
-
- t = queue->tunnel;
- GNUNET_assert (0 < t->pending_messages);
- t->pending_messages--;
- type = 0;
-
- /* Fill buf */
- switch (queue->type)
- {
- case 0:
- case GNUNET_MESSAGE_TYPE_MESH_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
- case GNUNET_MESSAGE_TYPE_MESH_POLL:
- case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
- case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
- case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
- case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "* raw: %s\n",
- GNUNET_MESH_DEBUG_M2S (queue->type));
- /* Fall through */
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
- data_size = send_core_data_raw (queue->cls, size, buf);
- msg = (struct GNUNET_MessageHeader *) buf;
- type = ntohs (msg->type);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
- data_size = send_core_path_create (queue->cls, size, buf);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
- data_size = send_core_path_ack (queue->cls, size, buf);
- break;
- default:
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "* type unknown: %u\n",
- queue->type);
- data_size = 0;
- }
-
- if (0 < drop_percent &&
- GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Dropping message of type %s\n",
- GNUNET_MESH_DEBUG_M2S(queue->type));
- data_size = 0;
- }
- /* Free queue, but cls was freed by send_core_* */
- queue_destroy (queue, GNUNET_NO);
-
- /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
- pid = ((struct GNUNET_MESH_Data *) buf)->pid;
- pid = ntohl (pid);
- switch (type)
- {
- case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
- if (GMC_is_pid_bigger(pid, t->next_fc.last_pid_sent))
- t->next_fc.last_pid_sent = pid;
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
- break;
- case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
- if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_sent))
- t->prev_fc.last_pid_sent = pid;
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
- break;
- default:
- break;
- }
-
- if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
- tunnel_destroy (t);
- }
-
- /* If more data in queue, send next */
- queue = queue_get_next (peer);
- if (NULL != queue)
- {
- struct GNUNET_PeerIdentity id;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
- GNUNET_PEER_resolve (peer->id, &id);
- peer->core_transmit =
- GNUNET_CORE_notify_transmit_ready(core_handle,
- 0,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &id,
- queue->size,
- &queue_send,
- peer);
- }
- else if (NULL != peer->queue_head)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "* %s stalled\n",
- GNUNET_i2s (&my_full_id));
- if (peer->id == t->next_hop)
- fc = &t->next_fc;
- else if (peer->id == t->prev_hop)
- fc = &t->prev_fc;
- else
- {
- GNUNET_break (0);
- return data_size;
- }
- if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
- {
- fc->t = t;
- fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
- &tunnel_poll, fc);
- }
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
- return data_size;
-}
-
-
-/**
- * @brief Queue and pass message to core when possible.
- *
- * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
- * accounts for it. In case the queue is full, the message is dropped and
- * a break issued.
- *
- * Otherwise, message is treated as internal and allowed to go regardless of
- * queue status.
- *
- * @param cls Closure (@c type dependant). It will be used by queue_send to
- * build the message to be sent if not already prebuilt.
- * @param type Type of the message, 0 for a raw message.
- * @param size Size of the message.
- * @param dst Neighbor to send message to.
- * @param t Tunnel this message belongs to.
- */
-static void
-queue_add (void *cls, uint16_t type, size_t size,
- struct MeshPeerInfo *dst, struct MeshTunnel *t)
-{
- struct MeshPeerQueue *queue;
- struct GNUNET_PeerIdentity id;
- struct MeshFlowControl *fc;
- uint32_t pid;
- uint32_t pid_q;
- int priority;
-
- fc = NULL;
- priority = GNUNET_NO;
- if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
- {
- fc = &t->next_fc;
- pid = ntohl (((struct GNUNET_MESH_Data *)cls)->pid);
- }
- else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
- {
- fc = &t->prev_fc;
- pid = ntohl (((struct GNUNET_MESH_Data *)cls)->pid);
- }
- if (NULL != fc)
- {
- if (fc->queue_n >= t->queue_max)
- {
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "queue full: %u/%u\n",
- fc->queue_n, t->queue_max);
- GNUNET_STATISTICS_update (stats,
- "# messages dropped (buffer full)",
- 1, GNUNET_NO);
- /* Get the PID of the oldest message in the queue */
- for (queue = dst->queue_head; queue != NULL; queue = queue->next)
- if (queue->type == type && queue->tunnel == t)
- {
- pid_q = ntohl (((struct GNUNET_MESH_Data *)(queue->cls))->pid);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "pid: %u, pid_q: %u\n", pid, pid_q);
- break;
- }
- GNUNET_assert (NULL != queue);
-
- /* If this is an earlier message that that, give it priority:
- * - drop the newest message in the queue
- * - instert current one at the end of the queue (first to get out)
- */
- if (GNUNET_YES == t->reliable && GMC_is_pid_bigger(pid_q, pid))
- {
- for (queue = dst->queue_tail; queue != NULL; queue = queue->prev)
- if (queue->type == type && queue->tunnel == t)
- {
- /* Drop message from queue */
- pid_q = ntohl (((struct GNUNET_MESH_Data *)(queue->cls))->pid);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "dropping pid: %u\n", pid_q);
- queue_destroy (queue, GNUNET_YES);
- t->pending_messages--;
- priority = GNUNET_YES;
- break;
- }
- }
- else
- return; /* Drop this message */
- }
- fc->queue_n++;
- }
- queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
- queue->cls = cls;
- queue->type = type;
- queue->size = size;
- queue->peer = dst;
- queue->tunnel = t;
- if (GNUNET_YES == priority)
- GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
- else
- GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
- if (NULL == dst->core_transmit)
- {
- GNUNET_PEER_resolve (dst->id, &id);
- dst->core_transmit =
- GNUNET_CORE_notify_transmit_ready (core_handle,
- 0,
- 0,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &id,
- size,
- &queue_send,
- dst);
- }
- t->pending_messages++;
-}
-
-
-/******************************************************************************/
-/******************** MESH NETWORK HANDLERS **************************/
-/******************************************************************************/
-
-
-/**
- * Core handler for path creation
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- unsigned int own_pos;
- uint16_t size;
- uint16_t i;
- MESH_TunnelNumber tid;
- struct GNUNET_MESH_CreateTunnel *msg;
- struct GNUNET_PeerIdentity *pi;
- struct MeshPeerPath *path;
- struct MeshPeerInfo *dest_peer_info;
- struct MeshPeerInfo *orig_peer_info;
- struct MeshTunnel *t;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received a path create msg [%s]\n",
- GNUNET_i2s (&my_full_id));
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
-
- size -= sizeof (struct GNUNET_MESH_CreateTunnel);
- if (size % sizeof (struct GNUNET_PeerIdentity))
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- size /= sizeof (struct GNUNET_PeerIdentity);
- if (size < 1)
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
- msg = (struct GNUNET_MESH_CreateTunnel *) message;
-
- tid = ntohl (msg->tid);
- pi = (struct GNUNET_PeerIdentity *) &msg[1];
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
- t = tunnel_get (pi, tid);
- if (NULL == t) /* might be a local tunnel */
- {
- uint32_t opt;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
- t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
- if (NULL == t)
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- t->port = ntohl (msg->port);
- opt = ntohl (msg->opt);
- if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
- {
- t->nobuffer = GNUNET_YES;
- t->queue_max = 1;
- }
- if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
- {
- t->reliable = GNUNET_YES;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
-
- tunnel_reset_timeout (t);
- }
- t->state = MESH_TUNNEL_WAITING;
- dest_peer_info =
- GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
- if (NULL == dest_peer_info)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Creating PeerInfo for destination.\n");
- dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
- dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
- GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
- dest_peer_info,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
- }
- orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
- if (NULL == orig_peer_info)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " Creating PeerInfo for origin.\n");
- orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
- orig_peer_info->id = GNUNET_PEER_intern (pi);
- GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
- path = path_new (size);
- own_pos = 0;
- for (i = 0; i < size; i++)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
- GNUNET_i2s (&pi[i]));
- path->peers[i] = GNUNET_PEER_intern (&pi[i]);
- if (path->peers[i] == myid)
- own_pos = i;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
- if (own_pos == 0 && path->peers[own_pos] != myid)
- {
- /* create path: self not found in path through self */
- GNUNET_break_op (0);
- path_destroy (path);
- tunnel_destroy (t);
- return GNUNET_OK;
- }
- path_add_to_peers (path, GNUNET_NO);
- tunnel_use_path (t, path);
-
- peer_info_add_tunnel (dest_peer_info, t);
-
- if (own_pos == size - 1)
- {
- struct MeshClient *c;
-
- /* Find target client */
- c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
- if (NULL == c)
- {
- /* TODO send reject */
- return GNUNET_OK;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
- peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
-
- /* Assign local tid */
- while (NULL != tunnel_get_incoming (next_local_tid))
- next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
- t->local_tid_dest = next_local_tid++;
- next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
-
- if (GNUNET_YES == t->reliable)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
- t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
- t->bck_rel->t = t;
- t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
- }
-
- tunnel_add_client (t, c);
- send_client_tunnel_create (t);
- send_path_ack (t);
- }
- else
- {
- struct MeshPeerPath *path2;
-
- t->next_hop = path->peers[own_pos + 1];
- GNUNET_PEER_change_rc(t->next_hop, 1);
-
- /* It's for somebody else! Retransmit. */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
- path2 = path_duplicate (path);
- peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
- peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
- send_create_path (t);
- }
- return GNUNET_OK;
-}
-
-
-
-/**
- * Core handler for path ACKs
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_PathACK *msg;
- struct MeshPeerInfo *peer_info;
- struct MeshPeerPath *p;
- struct MeshTunnel *t;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
- GNUNET_i2s (&my_full_id));
- msg = (struct GNUNET_MESH_PathACK *) message;
- t = tunnel_get (&msg->oid, ntohl(msg->tid));
- if (NULL == t)
- {
- /* TODO notify that we don't know the tunnel */
- GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
- GNUNET_i2s (&msg->oid), ntohl(msg->tid));
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
- GNUNET_i2s (&msg->oid), ntohl(msg->tid));
-
- peer_info = peer_get (&msg->peer_id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
- GNUNET_i2s (&msg->peer_id));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
- GNUNET_i2s (peer));
-
- /* Add path to peers? */
- p = t->path;
- if (NULL != p)
- {
- path_add_to_peers (p, GNUNET_YES);
- }
- else
- {
- GNUNET_break (0);
- }
- t->state = MESH_TUNNEL_READY;
- t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
- t->prev_fc.last_ack_sent = ntohl (msg->ack);
-
- /* Message for us? */
- if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
- if (NULL == t->owner)
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- if (NULL != peer_info->dhtget)
- {
- GNUNET_DHT_get_stop (peer_info->dhtget);
- peer_info->dhtget = NULL;
- }
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
- return GNUNET_OK;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " not for us, retransmitting...\n");
- peer_info = peer_get (&msg->oid);
- send_prebuilt_message (message, t->prev_hop, t);
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for notifications of broken paths
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_PathBroken *msg;
- struct MeshTunnel *t;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
- msg = (struct GNUNET_MESH_PathBroken *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
- GNUNET_i2s (&msg->peer1));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
- GNUNET_i2s (&msg->peer2));
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
- if (NULL == t)
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
- GNUNET_PEER_search (&msg->peer2));
- return GNUNET_OK;
-
-}
-
-
-/**
- * Core handler for tunnel destruction
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_TunnelDestroy *msg;
- struct MeshTunnel *t;
-
- msg = (struct GNUNET_MESH_TunnelDestroy *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got a TUNNEL DESTROY packet from %s\n",
- GNUNET_i2s (peer));
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " for tunnel %s [%u]\n",
- GNUNET_i2s (&msg->oid), ntohl (msg->tid));
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
- if (NULL == t)
- {
- /* Probably already got the message from another path,
- * destroyed the tunnel and retransmitted to children.
- * Safe to ignore.
- */
- GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
- 1, GNUNET_NO);
- return GNUNET_OK;
- }
- if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
- t->local_tid, t->local_tid_dest);
- }
- if (GNUNET_PEER_search (peer) == t->prev_hop)
- {
- // TODO check owner's signature
- // TODO add owner's signatue to tunnel for retransmission
- peer_cancel_queues (t->prev_hop, t);
- GNUNET_PEER_change_rc (t->prev_hop, -1);
- t->prev_hop = 0;
- }
- else if (GNUNET_PEER_search (peer) == t->next_hop)
- {
- // TODO check dest's signature
- // TODO add dest's signatue to tunnel for retransmission
- peer_cancel_queues (t->next_hop, t);
- GNUNET_PEER_change_rc (t->next_hop, -1);
- t->next_hop = 0;
- }
- else
- {
- GNUNET_break_op (0);
- // TODO check both owner AND destination's signature to see which matches
- // TODO restransmit in appropriate direction
- return GNUNET_OK;
- }
- tunnel_destroy_empty (t);
-
- // TODO: add timeout to destroy the tunnel anyway
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for mesh network traffic going from the origin to a peer
- *
- * @param cls closure
- * @param peer peer identity this notification is about
- * @param message message
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
- */
-static int
-handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_Data *msg;
- struct MeshTunnel *t;
- uint32_t pid;
- uint32_t ttl;
- size_t size;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
- GNUNET_i2s (peer));
- /* Check size */
- size = ntohs (message->size);
- if (size <
- sizeof (struct GNUNET_MESH_Data) +
- sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- msg = (struct GNUNET_MESH_Data *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
- GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
- /* Check tunnel */
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
- if (NULL == t)
- {
- /* TODO notify back: we don't know this tunnel */
- GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- pid = ntohl (msg->pid);
- if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
- {
- GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
- GNUNET_break_op (0);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received PID %u, ACK %u\n",
- pid, t->prev_fc.last_ack_sent);
- tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
- return GNUNET_OK;
- }
-
- tunnel_reset_timeout (t);
- if (t->dest == myid)
- {
- /* TODO signature verification */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " it's for us! sending to clients...\n");
- GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
-// if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv)) FIXME use
- if ( (GNUNET_NO == t->reliable &&
- GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv))
- ||
- (GNUNET_YES == t->reliable &&
- pid == t->prev_fc.last_pid_recv + 1) )
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " pid %u not seen yet, forwarding\n", pid);
- t->prev_fc.last_pid_recv = pid;
- tunnel_send_client_ucast (t, msg);
- }
- else
- {
-// GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- " Pid %u not expected (%u), sending FWD ACK!\n",
- pid, t->prev_fc.last_pid_recv + 1);
- }
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK);
- return GNUNET_OK;
- }
- if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv))
- t->prev_fc.last_pid_recv = pid;
- if (0 == t->next_hop)
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- ttl = ntohl (msg->ttl);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
- if (ttl == 0)
- {
- GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " not for us, retransmitting...\n");
-
- send_prebuilt_message (message, t->next_hop, t);
- GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for mesh network traffic toward the owner of a tunnel
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_Data *msg;
- struct MeshTunnel *t;
- size_t size;
- uint32_t pid;
- uint32_t ttl;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
- GNUNET_i2s (peer));
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
- sizeof (struct GNUNET_MessageHeader)) /* at least a header */
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
- msg = (struct GNUNET_MESH_Data *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
- GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
- pid = ntohl (msg->pid);
- if (NULL == t)
- {
- /* TODO notify that we dont know this tunnel (whom)? */
- GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
- pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
- return GNUNET_OK;
- }
-
- if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
- {
- GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
- GNUNET_break_op (0);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received PID %u, ACK %u\n",
- pid, t->next_fc.last_ack_sent);
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
- return GNUNET_OK;
- }
-
- if (myid == t->id.oid)
- {
- /* TODO signature verification */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " it's for us! sending to clients...\n");
- GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
- if ( (GNUNET_NO == t->reliable &&
- GMC_is_pid_bigger(pid, t->next_fc.last_pid_recv))
- ||
- (GNUNET_YES == t->reliable &&
- pid == t->next_fc.last_pid_recv + 1) ) // FIXME use "futures" as accepting
- {
- t->next_fc.last_pid_recv = pid;
- tunnel_send_client_to_orig (t, msg);
- }
- else
- {
-// GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- " Pid %u not expected, sending FWD ACK!\n", pid);
- }
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " not for us, retransmitting...\n");
- if (GMC_is_pid_bigger (pid, t->next_fc.last_pid_recv))
- t->next_fc.last_pid_recv = pid;
- if (0 == t->prev_hop) /* No owner AND no prev hop */
- {
- if (GNUNET_YES == t->destroy)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "to orig received on a dying tunnel %s [%X]\n",
- GNUNET_i2s (&msg->oid), ntohl(msg->tid));
- return GNUNET_OK;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "unknown to origin at %s\n",
- GNUNET_i2s (&my_full_id));
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "from peer %s\n",
- GNUNET_i2s (peer));
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "on tunnel %s [%X]\n",
- GNUNET_i2s (&msg->oid), ntohl(msg->tid));
- return GNUNET_OK;
- }
- ttl = ntohl (msg->ttl);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
- if (ttl == 0)
- {
- GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
- return GNUNET_OK;
- }
- send_prebuilt_message (message, t->prev_hop, t);
- GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
-
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for mesh network traffic end-to-end ACKs.
- *
- * @param cls Closure.
- * @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)
- */
-static int
-handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_DataACK *msg;
- struct MeshTunnelReliability *rel;
- struct MeshReliableMessage *copy;
- struct MeshReliableMessage *next;
- struct MeshTunnel *t;
- GNUNET_PEER_Id id;
- uint32_t ack;
- uint16_t type;
- int work;
-
- type = ntohs (message->type);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
- GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
- msg = (struct GNUNET_MESH_DataACK *) message;
-
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
- if (NULL == t)
- {
- /* TODO notify that we dont know this tunnel (whom)? */
- GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
- return GNUNET_OK;
- }
- ack = ntohl (msg->pid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
-
- /* Is this a forward or backward ACK? */
- id = GNUNET_PEER_search (peer);
- if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
- if (NULL == t->owner)
- {
- send_prebuilt_message (message, t->prev_hop, t);
- return GNUNET_OK;
- }
- rel = t->fwd_rel;
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
- }
- else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
- if (NULL == t->client)
- {
- send_prebuilt_message (message, t->next_hop, t);
- return GNUNET_OK;
- }
- rel = t->bck_rel;
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
- }
- else
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %u\n", ack);
- for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
- {
- struct GNUNET_TIME_Relative time;
-
- if (copy->id > ack)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->id);
- break;
- }
- work = GNUNET_YES;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->id);
- next = copy->next;
- time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
- rel->expected_delay.rel_value += time.rel_value;
- rel->expected_delay.rel_value /= 2;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
- GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
- GNUNET_NO));
- rel->retry_timer = rel->expected_delay;
- GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
- GNUNET_free (copy);
- }
-
- if (GNUNET_YES == work)
- {
- if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
- {
- GNUNET_SCHEDULER_cancel (rel->retry_task);
- if (NULL == rel->head_sent)
- {
- rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
- }
- else
- {
- struct GNUNET_TIME_Absolute new_target;
- struct GNUNET_TIME_Relative delay;
-
- new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
- rel->retry_timer);
- delay = GNUNET_TIME_absolute_get_remaining (new_target);
- rel->retry_task =
- GNUNET_SCHEDULER_add_delayed (delay,
- &tunnel_retransmit_message,
- rel);
- }
- }
- else
- GNUNET_break (0);
- }
- return GNUNET_OK;
-}
-
-/**
- * Core handler for mesh network traffic point-to-point acks.
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_ACK *msg;
- struct MeshTunnel *t;
- struct MeshFlowControl *fc;
- GNUNET_PEER_Id id;
- uint32_t ack;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
- GNUNET_i2s (peer));
- msg = (struct GNUNET_MESH_ACK *) message;
-
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
-
- if (NULL == t)
- {
- /* TODO notify that we dont know this tunnel (whom)? */
- GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
- return GNUNET_OK;
- }
- ack = ntohl (msg->pid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
-
- /* Is this a forward or backward ACK? */
- id = GNUNET_PEER_search (peer);
- if (t->next_hop == id)
- {
- debug_fwd_ack++;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
- fc = &t->next_fc;
- }
- else if (t->prev_hop == id)
- {
- debug_bck_ack++;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
- fc = &t->prev_fc;
- }
- else
- {
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
-
- if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
- GMC_is_pid_bigger (ack, fc->last_ack_recv))
- {
- GNUNET_SCHEDULER_cancel (fc->poll_task);
- fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
- fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
- }
- fc->last_ack_recv = ack;
- peer_unlock_queue (id);
-
- if (t->next_hop == id)
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
- else
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
-
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for mesh network traffic point-to-point ack polls.
- *
- * @param cls closure
- * @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)
- */
-static int
-handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_Poll *msg;
- struct MeshTunnel *t;
- struct MeshFlowControl *fc;
- GNUNET_PEER_Id id;
- uint32_t pid;
- uint32_t old;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
- GNUNET_i2s (peer));
-
- msg = (struct GNUNET_MESH_Poll *) message;
-
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
-
- if (NULL == t)
- {
- /* TODO notify that we dont know this tunnel (whom)? */
- GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
- GNUNET_break_op (0);
- return GNUNET_OK;
- }
-
- /* Is this a forward or backward ACK? */
- id = GNUNET_PEER_search(peer);
- pid = ntohl (msg->pid);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
- if (t->next_hop == id)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->next_fc.last_pid_recv);
- fc = &t->next_fc;
- old = fc->last_pid_recv;
- fc->last_pid_recv = pid;
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
- }
- else if (t->prev_hop == id)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->prev_fc.last_pid_recv);
- fc = &t->prev_fc;
- old = fc->last_pid_recv;
- fc->last_pid_recv = pid;
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
- }
- else
- GNUNET_break (0);
-
- if (GNUNET_YES == t->reliable)
- fc->last_pid_recv = old;
-
- return GNUNET_OK;
-}
-
-
-/**
- * Core handler for mesh keepalives.
- *
- * @param cls closure
- * @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)
- *
- * TODO: Check who we got this from, to validate route.
- */
-static int
-handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_TunnelKeepAlive *msg;
- struct MeshTunnel *t;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
- GNUNET_i2s (peer));
-
- msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
- t = tunnel_get (&msg->oid, ntohl (msg->tid));
-
- if (NULL == t)
- {
- /* TODO notify that we dont know that tunnel */
- GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
- GNUNET_NO);
- return GNUNET_OK;
- }
-
- tunnel_reset_timeout (t);
- if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
- return GNUNET_OK;
-
- GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
- send_prebuilt_message (message, t->next_hop, t);
- return GNUNET_OK;
- }
-
-
-
-/**
- * Functions to handle messages from core
- */
-static struct GNUNET_CORE_MessageHandler core_handlers[] = {
- {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
- {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
- sizeof (struct GNUNET_MESH_PathBroken)},
- {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
- sizeof (struct GNUNET_MESH_TunnelDestroy)},
- {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
- {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
- {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
- sizeof (struct GNUNET_MESH_DataACK)},
- {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
- sizeof (struct GNUNET_MESH_DataACK)},
- {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
- sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
- {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
- sizeof (struct GNUNET_MESH_ACK)},
- {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
- sizeof (struct GNUNET_MESH_Poll)},
- {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
- sizeof (struct GNUNET_MESH_PathACK)},
- {NULL, 0, 0}
-};
-
-
-
-/******************************************************************************/
-/**************** MESH LOCAL HANDLER HELPERS ***********************/
-/******************************************************************************/
-
-
-#if LATER
-/**
- * notify_client_connection_failure: notify a client that the connection to the
- * requested remote peer is not possible (for instance, no route found)
- * Function called when the socket is ready to queue more data. "buf" will be
- * NULL and "size" zero if the socket was closed for writing in the meantime.
- *
- * @param cls closure
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
-static size_t
-notify_client_connection_failure (void *cls, size_t size, void *buf)
-{
- int size_needed;
- struct MeshPeerInfo *peer_info;
- struct GNUNET_MESH_PeerControl *msg;
- struct GNUNET_PeerIdentity id;
-
- if (0 == size && NULL == buf)
- {
- // TODO retry? cancel?
- return 0;
- }
-
- size_needed = sizeof (struct GNUNET_MESH_PeerControl);
- peer_info = (struct MeshPeerInfo *) cls;
- msg = (struct GNUNET_MESH_PeerControl *) buf;
- msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
-// msg->tunnel_id = htonl(peer_info->t->tid);
- GNUNET_PEER_resolve (peer_info->id, &id);
- memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
-
- return size_needed;
-}
-#endif
-
-
-/**
- * Send keepalive packets for a tunnel.
- *
- * @param cls Closure (tunnel for which to send the keepalive).
- * @param tc Notification context.
- *
- * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
- */
-static void
-path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct MeshTunnel *t = cls;
- struct GNUNET_MESH_TunnelKeepAlive *msg;
- size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
- char cbuf[size];
-
- t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
- NULL == t->owner || 0 == t->local_tid)
- {
- return;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "sending keepalive for tunnel %d\n", t->id.tid);
-
- msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
- msg->header.size = htons (size);
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
- msg->oid = my_full_id;
- msg->tid = htonl (t->id.tid);
- send_prebuilt_message (&msg->header, t->next_hop, t);
-
- t->maintenance_task =
- GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
-}
-
-
-/**
- * Function to process paths received for a new peer addition. The recorded
- * paths form the initial tunnel, which can be optimized later.
- * Called on each result obtained for the DHT search.
*
- * @param cls closure
- * @param exp when will this value expire
- * @param key key of the result
- * @param get_path path of the get request
- * @param get_path_length lenght of get_path
- * @param put_path path of the put request
- * @param put_path_length length of the put_path
- * @param type type of the result
- * @param size number of bytes in data
- * @param data pointer to the result data
+ * Dictionary:
+ * - peer: other mesh instance. If there is direct connection it's a neighbor.
+ * - tunnel: encrypted connection to a peer, neighbor or not.
+ * - channel: connection between two clients, on the same or different peers.
+ * have properties like reliability.
+ * - path: series of directly connected peer from one peer to another.
+ * - connection: path which is being used in a tunnel.
*/
-static void
-dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
- const struct GNUNET_HashCode * key,
- const struct GNUNET_PeerIdentity *get_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
- size_t size, const void *data)
-{
- struct MeshPeerInfo *peer = cls;
- struct MeshPeerPath *p;
- struct GNUNET_PeerIdentity pi;
- int i;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
- GNUNET_PEER_resolve (peer->id, &pi);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
-
- p = path_build_from_dht (get_path, get_path_length,
- put_path, put_path_length);
- path_add_to_peers (p, GNUNET_NO);
- path_destroy (p);
- for (i = 0; i < peer->ntunnels; i++)
- {
- struct GNUNET_PeerIdentity id;
-
- GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
- GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
- peer->tunnels[i]->local_tid,
- peer->tunnels[i]->local_tid_dest);
- if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
- peer_connect (peer, peer->tunnels[i]);
- }
- }
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "mesh.h"
+#include "gnunet_statistics_service.h"
- return;
-}
+#include "gnunet-service-mesh_local.h"
+#include "gnunet-service-mesh_channel.h"
+#include "gnunet-service-mesh_connection.h"
+#include "gnunet-service-mesh_tunnel.h"
+#include "gnunet-service-mesh_dht.h"
+#include "gnunet-service-mesh_peer.h"
/******************************************************************************/
-/********************* MESH LOCAL HANDLES **************************/
+/*********************** GLOBAL VARIABLES ****************************/
/******************************************************************************/
+/****************************** Global variables ******************************/
/**
- * Handler for client disconnection
- *
- * @param cls closure
- * @param client identification of the client; NULL
- * for the last call when the server is destroyed
- */
-static void
-handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
-{
- struct MeshClient *c;
- struct MeshClient *next;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
- if (client == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
- return;
- }
-
- c = client_get (client);
- if (NULL != c)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
- c->id);
- GNUNET_SERVER_client_drop (c->handle);
- c->shutting_down = GNUNET_YES;
- GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
- &tunnel_destroy_iterator, c);
- GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
- &tunnel_destroy_iterator, c);
- GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
- GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
-
- if (NULL != c->ports)
- GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
- next = c->next;
- GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
- GNUNET_free (c);
- GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
- c = next;
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
- return;
-}
-
-
-/**
- * Handler for new clients
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message, which includes messages the client wants
- */
-static void
-handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_ClientConnect *cc_msg;
- struct MeshClient *c;
- unsigned int size;
- uint32_t *p;
- unsigned int i;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
-
- /* Check data sanity */
- size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
- cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
- if (0 != (size % sizeof (uint32_t)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- size /= sizeof (uint32_t);
-
- /* Create new client structure */
- c = GNUNET_malloc (sizeof (struct MeshClient));
- c->id = next_client_id++; /* overflow not important: just for debug */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
- c->handle = client;
- GNUNET_SERVER_client_keep (client);
- GNUNET_SERVER_client_set_user_context (client, c);
- if (size > 0)
- {
- uint32_t u32;
-
- p = (uint32_t *) &cc_msg[1];
- c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
- for (i = 0; i < size; i++)
- {
- u32 = ntohl (p[i]);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
-
- /* store in client's hashmap */
- GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
- /* store in global hashmap */
- /* FIXME only allow one client to have the port open,
- * have a backup hashmap with waiting clients */
- GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- }
- }
-
- GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
- c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
- c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
- GNUNET_SERVER_notification_context_add (nc, client);
- GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
-}
-
-
-/**
- * Handler for requests of new tunnels
- *
- * @param cls Closure.
- * @param client Identification of the client.
- * @param message The actual message.
- */
-static void
-handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_TunnelMessage *t_msg;
- struct MeshPeerInfo *peer_info;
- struct MeshTunnel *t;
- struct MeshClient *c;
- MESH_TunnelNumber tid;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
-
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
-
- /* Message size sanity check */
- if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
- GNUNET_i2s (&t_msg->peer));
- /* Sanity check for tunnel numbering */
- tid = ntohl (t_msg->tunnel_id);
- if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- /* Sanity check for duplicate tunnel IDs */
- if (NULL != tunnel_get_by_local_id (c, tid))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- /* Create tunnel */
- while (NULL != tunnel_get_by_pi (myid, next_tid))
- next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
- t = tunnel_new (myid, next_tid, c, tid);
- next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
- if (NULL == t)
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- t->port = ntohl (t_msg->port);
- tunnel_set_options (t, ntohl (t_msg->options));
- if (GNUNET_YES == t->reliable)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
- t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
- t->fwd_rel->t = t;
- t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
- GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
-
- peer_info = peer_get (&t_msg->peer);
- peer_info_add_tunnel (peer_info, t);
- peer_connect (peer_info, t);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
-}
-
-
-/**
- * Handler for requests of deleting tunnels
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
-static void
-handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_TunnelMessage *tunnel_msg;
- struct MeshClient *c;
- struct MeshTunnel *t;
- MESH_TunnelNumber tid;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got a DESTROY TUNNEL from client!\n");
-
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
-
- /* Message sanity check */
- if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
-
- /* Retrieve tunnel */
- tid = ntohl (tunnel_msg->tunnel_id);
- t = tunnel_get_by_local_id(c, tid);
- if (NULL == t)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- /* Cleanup after the tunnel */
- client_delete_tunnel (c, t);
- if (c == t->client)
- {
- t->client = NULL;
- }
- if (c == t->owner)
- {
- peer_info_remove_tunnel (peer_get_short (t->dest), t);
- t->owner = NULL;
- }
-
- /* The tunnel will be destroyed when the last message is transmitted. */
- tunnel_destroy_empty (t);
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
-}
-
-
-/**
- * Handler for client traffic
- *
- * @param cls closure
- * @param client identification of the client
- * @param message the actual message
- */
-static void
-handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_LocalData *data_msg;
- struct MeshClient *c;
- struct MeshTunnel *t;
- struct MeshFlowControl *fc;
- MESH_TunnelNumber tid;
- size_t size;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got data from a client!\n");
-
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
-
- data_msg = (struct GNUNET_MESH_LocalData *) message;
-
- /* Sanity check for message size */
- size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- /* Tunnel exists? */
- tid = ntohl (data_msg->tid);
- if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- t = tunnel_get_by_local_id (c, tid);
- if (NULL == t)
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- /* Is the client in the tunnel? */
- if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
- t->owner &&
- t->owner->handle == client)
- ||
- (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
- t->client &&
- t->client->handle == client) ) )
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- /* Ok, everything is correct, send the message
- * (pretend we got it from a mesh peer)
- */
- {
- struct GNUNET_MESH_Data *payload;
- char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
-
- fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
- if (GNUNET_YES == t->reliable)
- {
- struct MeshTunnelReliability *rel;
- struct MeshReliableMessage *copy;
-
- copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
- + sizeof(struct GNUNET_MESH_Data)
- + size);
- copy->id = fc->last_pid_recv + 1;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->id);
- copy->timestamp = GNUNET_TIME_absolute_get ();
- rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
- copy->rel = rel;
- GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
- if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
- {
- rel->retry_timer = rel->expected_delay;
- rel->retry_task =
- GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
- &tunnel_retransmit_message,
- rel);
- }
- payload = (struct GNUNET_MESH_Data *) ©[1];
- }
- else
- {
- payload = (struct GNUNET_MESH_Data *) cbuf;
- }
- memcpy (&payload[1], &data_msg[1], size);
- payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
- payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
- GNUNET_MESSAGE_TYPE_MESH_UNICAST :
- GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
- GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
- payload->tid = htonl (t->id.tid);
- payload->ttl = htonl (default_ttl);
- payload->pid = htonl (fc->last_pid_recv + 1);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- " calling generic handler...\n");
- if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
- handle_mesh_unicast (NULL, &my_full_id, &payload->header);
- else
- handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
-
- return;
-}
-
-
-/**
- * Handler for client's ACKs for payload traffic.
- *
- * @param cls Closure (unused).
- * @param client Identification of the client.
- * @param message The actual message.
- */
-static void
-handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct GNUNET_MESH_LocalAck *msg;
- struct MeshTunnel *t;
- struct MeshClient *c;
- MESH_TunnelNumber tid;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
-
- msg = (struct GNUNET_MESH_LocalAck *) message;
-
- /* Tunnel exists? */
- tid = ntohl (msg->tunnel_id);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
- t = tunnel_get_by_local_id (c, tid);
- if (NULL == t)
- {
- GNUNET_break (0);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
- if (t->owner == c)
- {
- /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
- t->prev_fc.last_ack_recv++;
- tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
- }
- else
- {
- /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
- t->next_fc.last_ack_recv++;
- tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
- }
-
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
-
- return;
-}
-
-
-
-/**
- * Iterator over all tunnels to send a monitoring client info about each tunnel.
- *
- * @param cls Closure (client handle).
- * @param key Key (hashed tunnel ID, unused).
- * @param value Tunnel info.
- *
- * @return GNUNET_YES, to keep iterating.
- */
-static int
-monitor_all_tunnels_iterator (void *cls,
- const struct GNUNET_HashCode * key,
- void *value)
-{
- struct GNUNET_SERVER_Client *client = cls;
- struct MeshTunnel *t = value;
- struct GNUNET_MESH_LocalMonitor *msg;
-
- msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
- GNUNET_PEER_resolve(t->id.oid, &msg->owner);
- msg->tunnel_id = htonl (t->id.tid);
- msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
- GNUNET_PEER_resolve (t->dest, &msg->destination);
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "* sending info about tunnel %s [%u]\n",
- GNUNET_i2s (&msg->owner), t->id.tid);
-
- GNUNET_SERVER_notification_context_unicast (nc, client,
- &msg->header, GNUNET_NO);
- return GNUNET_YES;
-}
-
-
-/**
- * Handler for client's MONITOR request.
- *
- * @param cls Closure (unused).
- * @param client Identification of the client.
- * @param message The actual message.
- */
-static void
-handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- struct MeshClient *c;
-
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Received get tunnels request from client %u\n",
- c->id);
- GNUNET_CONTAINER_multihashmap_iterate (tunnels,
- monitor_all_tunnels_iterator,
- client);
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Get tunnels request from client %u completed\n",
- c->id);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
-}
-
-
-/**
- * Handler for client's MONITOR_TUNNEL request.
- *
- * @param cls Closure (unused).
- * @param client Identification of the client.
- * @param message The actual message.
- */
-static void
-handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
-{
- const struct GNUNET_MESH_LocalMonitor *msg;
- struct GNUNET_MESH_LocalMonitor *resp;
- struct MeshClient *c;
- struct MeshTunnel *t;
-
- /* Sanity check for client registration */
- if (NULL == (c = client_get (client)))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-
- msg = (struct GNUNET_MESH_LocalMonitor *) message;
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Received tunnel info request from client %u for tunnel %s[%X]\n",
- c->id,
- &msg->owner,
- ntohl (msg->tunnel_id));
- t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
- if (NULL == t)
- {
- /* We don't know the tunnel FIXME */
- struct GNUNET_MESH_LocalMonitor warn;
-
- warn = *msg;
- GNUNET_SERVER_notification_context_unicast (nc, client,
- &warn.header,
- GNUNET_NO);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return;
- }
-
- /* Initialize context */
- resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
- *resp = *msg;
- GNUNET_PEER_resolve (t->dest, &resp->destination);
- resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
- GNUNET_SERVER_notification_context_unicast (nc, c->handle,
- &resp->header, GNUNET_NO);
- GNUNET_free (resp);
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Monitor tunnel request from client %u completed\n",
- c->id);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
-}
-
-
-/**
- * Functions to handle messages from clients
+ * Handle to the statistics service.
*/
-static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
- {&handle_local_new_client, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
- {&handle_local_tunnel_create, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
- sizeof (struct GNUNET_MESH_TunnelMessage)},
- {&handle_local_tunnel_destroy, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
- sizeof (struct GNUNET_MESH_TunnelMessage)},
- {&handle_local_data, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
- {&handle_local_ack, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
- sizeof (struct GNUNET_MESH_LocalAck)},
- {&handle_local_get_tunnels, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
- sizeof (struct GNUNET_MessageHeader)},
- {&handle_local_show_tunnel, NULL,
- GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
- sizeof (struct GNUNET_MESH_LocalMonitor)},
- {NULL, NULL, 0, 0}
-};
-
+struct GNUNET_STATISTICS_Handle *stats;
/**
- * Method called whenever a given peer connects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
+ * Local peer own ID (memory efficient handle).
*/
-static void
-core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
-{
- struct MeshPeerInfo *peer_info;
- struct MeshPeerPath *path;
-
- DEBUG_CONN ("Peer connected\n");
- DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
- peer_info = peer_get (peer);
- if (myid == peer_info->id)
- {
- DEBUG_CONN (" (self)\n");
- path = path_new (1);
- }
- else
- {
- DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
- path = path_new (2);
- path->peers[1] = peer_info->id;
- GNUNET_PEER_change_rc (peer_info->id, 1);
- GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
- }
- path->peers[0] = myid;
- GNUNET_PEER_change_rc (myid, 1);
- peer_info_add_path (peer_info, path, GNUNET_YES);
- return;
-}
-
+GNUNET_PEER_Id myid;
/**
- * Method called whenever a peer disconnects.
- *
- * @param cls closure
- * @param peer peer identity this notification is about
+ * Local peer own ID (full value).
*/
-static void
-core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
-{
- struct MeshPeerInfo *pi;
- struct MeshPeerQueue *q;
- struct MeshPeerQueue *n;
-
- DEBUG_CONN ("Peer disconnected\n");
- pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
- if (NULL == pi)
- {
- GNUNET_break (0);
- return;
- }
- q = pi->queue_head;
- while (NULL != q)
- {
- n = q->next;
- /* TODO try to reroute this traffic instead */
- queue_destroy(q, GNUNET_YES);
- q = n;
- }
- if (NULL != pi->core_transmit)
- {
- GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
- pi->core_transmit = NULL;
- }
- peer_remove_path (pi, pi->id, myid);
- if (myid == pi->id)
- {
- DEBUG_CONN (" (self)\n");
- }
- GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
- return;
-}
+struct GNUNET_PeerIdentity my_full_id;
/**
- * Install server (service) handlers and start listening to clients.
+ * Signal that shutdown is happening: prevent recover measures.
*/
-static void
-server_init (void)
-{
- GNUNET_SERVER_add_handlers (server_handle, client_handlers);
- GNUNET_SERVER_disconnect_notify (server_handle,
- &handle_local_client_disconnect, NULL);
- nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
-
- clients_head = NULL;
- clients_tail = NULL;
- next_client_id = 0;
- GNUNET_SERVER_resume (server_handle);
-}
+int shutting_down;
+/*************************** Static global variables **************************/
/**
- * To be called on core init/fail.
- *
- * @param cls Closure (config)
- * @param server handle to the server for this service
- * @param identity the public identity of this peer
+ * Own private key.
*/
-static void
-core_init (void *cls, struct GNUNET_CORE_Handle *server,
- const struct GNUNET_PeerIdentity *identity)
-{
- const struct GNUNET_CONFIGURATION_Handle *c = cls;
- static int i = 0;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
- GNUNET_break (core_handle == server);
- if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
- NULL == server)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- " core id %s\n",
- GNUNET_i2s (identity));
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- " my id %s\n",
- GNUNET_i2s (&my_full_id));
- GNUNET_CORE_disconnect (core_handle);
- core_handle = GNUNET_CORE_connect (c, /* Main configuration */
- NULL, /* Closure passed to MESH functions */
- &core_init, /* Call core_init once connected */
- &core_connect, /* Handle connects */
- &core_disconnect, /* remove peers on disconnects */
- NULL, /* Don't notify about all incoming messages */
- GNUNET_NO, /* For header only in notification */
- NULL, /* Don't notify about all outbound messages */
- GNUNET_NO, /* For header-only out notification */
- core_handlers); /* Register these handlers */
- if (10 < i++)
- GNUNET_abort();
- }
- server_init ();
- return;
-}
+static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
/******************************************************************************/
/************************ MAIN FUNCTIONS ****************************/
/******************************************************************************/
-/**
- * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
- *
- * @param cls closure
- * @param key current key code
- * @param value value in the hash map
- * @return GNUNET_YES if we should continue to iterate,
- * GNUNET_NO if not.
- */
-static int
-shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
-{
- struct MeshTunnel *t = value;
-
- tunnel_destroy (t);
- return GNUNET_YES;
-}
-
-/**
- * Iterator over peer hash map entries to destroy the tunnel during shutdown.
- *
- * @param cls closure
- * @param key current key code
- * @param value value in the hash map
- * @return GNUNET_YES if we should continue to iterate,
- * GNUNET_NO if not.
- */
-static int
-shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
-{
- struct MeshPeerInfo *p = value;
- struct MeshPeerQueue *q;
- struct MeshPeerQueue *n;
-
- q = p->queue_head;
- while (NULL != q)
- {
- n = q->next;
- if (q->peer == p)
- {
- queue_destroy(q, GNUNET_YES);
- }
- q = n;
- }
- peer_info_destroy (p);
- return GNUNET_YES;
-}
-
-
/**
* Task run during shutdown.
*
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
- if (core_handle != NULL)
- {
- GNUNET_CORE_disconnect (core_handle);
- core_handle = NULL;
- }
- GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
- GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
- if (dht_handle != NULL)
- {
- GNUNET_DHT_disconnect (dht_handle);
- dht_handle = NULL;
- }
- if (nc != NULL)
- {
- GNUNET_SERVER_notification_context_destroy (nc);
- nc = NULL;
- }
- if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
- {
- GNUNET_SCHEDULER_cancel (announce_id_task);
- announce_id_task = GNUNET_SCHEDULER_NO_TASK;
- }
+ shutting_down = GNUNET_YES;
+
+ GML_shutdown ();
+ GMD_shutdown ();
+ GMC_shutdown ();
+ GMT_shutdown ();
+ GMP_shutdown ();
+
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ stats = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
}
run (void *cls, struct GNUNET_SERVER_Handle *server,
const struct GNUNET_CONFIGURATION_Handle *c)
{
- char *keyfile;
- struct GNUNET_CRYPTO_EccPrivateKey *pk;
-
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
- server_handle = server;
- GNUNET_SERVER_suspend (server_handle);
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
- &keyfile))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("%s service is lacking key configuration settings (%s). Exiting.\n"),
- "mesh", "peer/privatekey");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
- &refresh_path_time))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("%s service is lacking key configuration settings (%s). Exiting.\n"),
- "mesh", "refresh path time");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
- &id_announce_time))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("%s service is lacking key configuration settings (%s). Exiting.\n"),
- "mesh", "id announce time");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
- &connect_timeout))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("%s service is lacking key configuration settings (%s). Exiting.\n"),
- "mesh", "connect timeout");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
- &max_msgs_queue))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("%s service is lacking key configuration settings (%s). Exiting.\n"),
- "mesh", "max msgs queue");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
- &max_tunnels))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("%s service is lacking key configuration settings (%s). Exiting.\n"),
- "mesh", "max tunnels");
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
- &default_ttl))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _
- ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
- "mesh", "default ttl", 64);
- default_ttl = 64;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
- &max_peers))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
- "mesh", "max peers", 1000);
- max_peers = 1000;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
- &drop_percent))
- {
- drop_percent = 0;
- }
- else
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Mesh is running with drop mode enabled. "
- "This is NOT a good idea! "
- "Remove the DROP_PERCENT option from your configuration.\n");
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
- &dht_replication_level))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _
- ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
- "mesh", "dht replication level", 3);
- dht_replication_level = 3;
- }
-
- tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
- incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
- peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
- ports = GNUNET_CONTAINER_multihashmap32_create (32);
-
- dht_handle = GNUNET_DHT_connect (c, 64);
- if (NULL == dht_handle)
- {
- GNUNET_break (0);
- }
stats = GNUNET_STATISTICS_create ("mesh", c);
/* Scheduled the task to clean up when shutdown is called */
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
NULL);
- pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
- GNUNET_free (keyfile);
- GNUNET_assert (NULL != pk);
- my_private_key = pk;
- GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
- GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
- &my_full_id.hashPubKey);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "reading key\n");
+ my_private_key = GNUNET_CRYPTO_eddsa_key_create_from_configuration (c);
+ GNUNET_assert (NULL != my_private_key);
+ GNUNET_CRYPTO_eddsa_key_get_public (my_private_key, &my_full_id.public_key);
myid = GNUNET_PEER_intern (&my_full_id);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Mesh for peer [%s] starting\n",
- GNUNET_i2s(&my_full_id));
+ GNUNET_i2s (&my_full_id));
+
+ GML_init (server); /* Local clients */
+ GMC_init (c); /* Connections */
+ GMP_init (c); /* Peers */
+ GMD_init (c); /* DHT */
+ GMT_init (c, my_private_key); /* Tunnels */
- core_handle = GNUNET_CORE_connect (c, /* Main configuration */
- NULL, /* Closure passed to MESH functions */
- &core_init, /* Call core_init once connected */
- &core_connect, /* Handle connects */
- &core_disconnect, /* remove peers on disconnects */
- NULL, /* Don't notify about all incoming messages */
- GNUNET_NO, /* For header only in notification */
- NULL, /* Don't notify about all outbound messages */
- GNUNET_NO, /* For header-only out notification */
- core_handlers); /* Register these handlers */
- if (NULL == core_handle)
- {
- GNUNET_break (0);
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- next_tid = 0;
- next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
- announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
}
int ret;
int r;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
+ shutting_down = GNUNET_NO;
r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
NULL);
+ GNUNET_free (my_private_key);
ret = (GNUNET_OK == r) ? 0 : 1;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
-
- INTERVAL_SHOW;
-
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
- GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);
return ret;
}
projects / oweals / gnunet.git / blobdiff