X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fmesh%2Fgnunet-service-mesh-enc.c;h=8a2b60da7d87898755c26c091e63c8ca9f422167;hb=5235a1f6c285d14b96fa2b3f16b617445b092d7b;hp=2de3822b6863f3c82e74d00160587196114d2557;hpb=60ecaf195aea1b6a62d12c60e05ade1f2308e76f;p=oweals%2Fgnunet.git diff --git a/src/mesh/gnunet-service-mesh-enc.c b/src/mesh/gnunet-service-mesh-enc.c index 2de3822b6..8a2b60da7 100644 --- a/src/mesh/gnunet-service-mesh-enc.c +++ b/src/mesh/gnunet-service-mesh-enc.c @@ -33,6685 +33,96 @@ * - relay corking down to core * - set ttl relative to path length * TODO END - * - * 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. - */ - -#include "platform.h" -#include "gnunet_crypto_lib.h" -#include "mesh_enc.h" -#include "mesh_protocol_enc.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_YES -#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_UNIT_SECONDS -#define MESH_RETRANSMIT_MARGIN 4 - -#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 -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 - -/** - * All the states a tunnel can be in. - */ -enum MeshTunnelState -{ - /** - * Uninitialized status, should never appear in operation. - */ - MESH_TUNNEL_NEW, - - /** - * Path to the peer not known yet - */ - MESH_TUNNEL_SEARCHING, - - /** - * Request sent, not yet answered. - */ - MESH_TUNNEL_WAITING, - - /** - * Peer connected and ready to accept data - */ - MESH_TUNNEL_READY, - - /** - * Peer connected previosly but not responding - */ - MESH_TUNNEL_RECONNECTING -}; - - -/** - * All the states a connection can be in. - */ -enum MeshConnectionState -{ - /** - * Uninitialized status, should never appear in operation. - */ - MESH_CONNECTION_NEW, - - /** - * Connection create message sent, waiting for ACK. - */ - MESH_CONNECTION_SENT, - - /** - * Connection ACK sent, waiting for ACK. - */ - MESH_CONNECTION_ACK, - - /** - * Connection confirmed, ready to carry traffic. - */ - MESH_CONNECTION_READY, -}; - - -/** - * All the states a connection can be in. - */ -enum MeshChannelState -{ - /** - * Uninitialized status, should never appear in operation. - */ - MESH_CHANNEL_NEW, - - /** - * Connection create message sent, waiting for ACK. - */ - MESH_CHANNEL_SENT, - - /** - * Connection confirmed, ready to carry traffic.. - */ - MESH_CHANNEL_READY, -}; - - -/******************************************************************************/ -/************************ DATA STRUCTURES ****************************/ -/******************************************************************************/ - -/** FWD declaration */ -struct MeshClient; -struct MeshPeer; -struct MeshTunnel2; -struct MeshConnection; -struct MeshChannel; -struct MeshChannelReliability; - - -/** - * 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 MeshPeer *peer; - - /** - * Connection this message belongs to. - */ - struct MeshConnection *c; - - /** - * Is FWD in c? - */ - int fwd; - - /** - * Channel this message belongs to, if known. - */ - struct MeshChannel *ch; - - /** - * Pointer to info stucture used as cls. - */ - void *cls; - - /** - * Type of message - */ - uint16_t type; - - /** - * Size of the message - */ - size_t size; -}; - - -/** - * Struct to encapsulate all the Flow Control information to a peer to which - * we are directly connected (on a core level). - */ -struct MeshFlowControl -{ - /** - * Connection this controls. - */ - struct MeshConnection *c; - - /** - * How many messages are in the queue on this connection. - */ - unsigned int queue_n; - - /** - * How many messages do we accept in the queue. - */ - unsigned int queue_max; - - /** - * Next ID to use. - */ - uint32_t next_pid; - - /** - * 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; - - /** - * 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; -}; - - -/** - * Struct containing all information regarding a given peer - */ -struct MeshPeer -{ - /** - * ID of the peer - */ - GNUNET_PEER_Id id; - - /** - * Last time we heard from this peer - */ - struct GNUNET_TIME_Absolute last_contact; - - /** - * 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 paths to this peer - */ - struct GNUNET_DHT_GetHandle *dhtget; - - /** - * Tunnel to this peer, if any. - */ - struct MeshTunnel2 *tunnel; - - /** - * Connections that go through this peer, indexed by tid; - */ - struct GNUNET_CONTAINER_MultiHashMap *connections; - - /** - * Handle for queued transmissions - */ - struct GNUNET_CORE_TransmitHandle *core_transmit; - - /** - * 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; -}; - - -/** - * Info needed to retry a message in case it gets lost. - */ -struct MeshReliableMessage -{ - /** - * Double linked list, FIFO style - */ - struct MeshReliableMessage *next; - struct MeshReliableMessage *prev; - - /** - * Type of message (payload, channel management). - */ - int16_t type; - - /** - * Tunnel Reliability queue this message is in. - */ - struct MeshChannelReliability *rel; - - /** - * ID of the message (ACK needed to free) - */ - uint32_t mid; - - /** - * When was this message issued (to calculate ACK delay) - */ - struct GNUNET_TIME_Absolute timestamp; - - /* struct GNUNET_MESH_Data with payload */ -}; - - -struct MeshChannelReliability -{ - /** - * Channel this is about. - */ - struct MeshChannel *ch; - - /** - * DLL of messages sent and not yet ACK'd. - */ - struct MeshReliableMessage *head_sent; - struct MeshReliableMessage *tail_sent; - - /** - * Messages pending to send. - */ - unsigned int n_sent; - - /** - * DLL of messages received out of order. - */ - struct MeshReliableMessage *head_recv; - struct MeshReliableMessage *tail_recv; - - /** - * Messages received. - */ - unsigned int n_recv; - - /** - * Can we send data to the client? - */ - int client_ready; - - /** - * 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. - */ - struct GNUNET_TIME_Relative expected_delay; -}; - - -/** - * Struct containing all information regarding a channel to a remote client. - */ -struct MeshChannel -{ - /** - * Tunnel this channel is in. - */ - struct MeshTunnel2 *t; - - /** - * Double linked list. - */ - struct MeshChannel *next; - struct MeshChannel *prev; - - /** - * Destination port of the channel. - */ - uint32_t port; - - /** - * Global channel number ( < GNUNET_MESH_LOCAL_CHANNEL_ID_CLI) - */ - MESH_ChannelNumber gid; - - /** - * Local tunnel number for root (owner) client. - * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 ) - */ - MESH_ChannelNumber lid_root; - - /** - * Local tunnel number for local destination clients (incoming number) - * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0). - */ - MESH_ChannelNumber lid_dest; - - /** - * Channel state. - */ - enum MeshChannelState state; - - /** - * Next MID to use for fwd traffic. - */ - uint32_t mid_send_fwd; - - /** - * Next MID expected for fwd traffic. - */ - uint32_t mid_recv_fwd; - - /** - * Next MID to use for bck traffic. - */ - uint32_t mid_send_bck; - - /** - * Next MID expected for bck traffic. - */ - uint32_t mid_recv_bck; - - /** - * Is the tunnel bufferless (minimum latency)? - */ - int nobuffer; - - /** - * Is the tunnel reliable? - */ - int reliable; - - /** - * Last time the channel was used - */ - struct GNUNET_TIME_Absolute timestamp; - - /** - * Client owner of the tunnel, if any - */ - struct MeshClient *root; - - /** - * Client destination of the tunnel, if any. - */ - struct MeshClient *dest; - - /** - * Flag to signal the destruction of the channel. - * If this is set GNUNET_YES the channel will be destroyed - * when the queue is empty. - */ - int destroy; - - /** - * Total messages pending for this channel, payload or not. - */ - unsigned int pending_messages; - - /** - * Reliability data. - * Only present (non-NULL) at the owner of a tunnel. - */ - struct MeshChannelReliability *fwd_rel; - - /** - * Reliability data. - * Only present (non-NULL) at the destination of a tunnel. - */ - struct MeshChannelReliability *bck_rel; - - /** - * Is the root prevented from sending more data? (We "owe" him an ACK). - */ - int blocked_fwd; - - /** - * Is the dest prevented from sending more data? (We "owe" him an ACK). - */ - int blocked_bck; -}; - - -/** - * Struct containing all information regarding a connection to a peer. - */ -struct MeshConnection -{ - /** - * DLL - */ - struct MeshConnection *next; - struct MeshConnection *prev; - - /** - * Tunnel this connection is part of. - */ - struct MeshTunnel2 *t; - - /** - * Flow control information for traffic fwd. - */ - struct MeshFlowControl fwd_fc; - - /** - * Flow control information for traffic bck. - */ - struct MeshFlowControl bck_fc; - - /** - * ID of the connection. - */ - struct GNUNET_HashCode id; - - /** - * State of the connection. - */ - enum MeshConnectionState state; - - /** - * Path being used for the tunnel. - */ - struct MeshPeerPath *path; - - /** - * Position of the local peer in the path. - */ - unsigned int own_pos; - - /** - * Task to keep the used paths alive at the owner, - * time tunnel out on all the other peers. - */ - GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task; - - /** - * Task to keep the used paths alive at the destination, - * time tunnel out on all the other peers. - */ - GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task; - - /** - * Pending message count. - */ - int pending_messages; - - /** - * Destroy flag: if true, destroy on last message. - */ - int destroy; -}; - - -/** - * Struct used to queue messages in a tunnel. - */ -struct MeshTunnelQueue -{ - /** - * DLL - */ - struct MeshTunnelQueue *next; - struct MeshTunnelQueue *prev; - - /** - * Channel. - */ - struct MeshChannel *ch; - - /** - * Message to send. - */ - /* struct GNUNET_MessageHeader *msg; */ -}; - - -/** - * Struct containing all information regarding a tunnel to a peer. - */ -struct MeshTunnel2 -{ - /** - * Endpoint of the tunnel. - */ - struct MeshPeer *peer; - - /** - * State of the tunnel. - */ - enum MeshTunnelState state; - - /** - * Local peer ephemeral private key - */ - struct GNUNET_CRYPTO_EccPrivateKey *my_eph_key; - - /** - * Local peer ephemeral public key - */ - struct GNUNET_CRYPTO_EccPublicKey *my_eph; - - /** - * Remote peer's public key. - */ - struct GNUNET_CRYPTO_EccPublicKey *peers_eph; - - /** - * Encryption ("our") key. - */ - struct GNUNET_CRYPTO_AesSessionKey e_key; - - /** - * Decryption ("their") key. - */ - struct GNUNET_CRYPTO_AesSessionKey d_key; - - /** - * Paths that are actively used to reach the destination peer. - */ - struct MeshConnection *connection_head; - struct MeshConnection *connection_tail; - - /** - * Next connection number. - */ - uint32_t next_cid; - - /** - * Channels inside this tunnel. - */ - struct MeshChannel *channel_head; - struct MeshChannel *channel_tail; - - /** - * Channel ID for the next created channel. - */ - MESH_ChannelNumber next_chid; - - /** - * Channel ID for the next incoming channel. - */ - MESH_ChannelNumber next_local_chid; - - /** - * Pending message count. - */ - int pending_messages; - - /** - * Destroy flag: if true, destroy on last message. - */ - int destroy; - - /** - * Queued messages, to transmit once tunnel gets connected. - */ - struct MeshTunnelQueue *tq_head; - struct MeshTunnelQueue *tq_tail; -}; - - - -/** - * 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_channels; - - /** - * Tunnels this client has accepted, indexed by incoming local id - */ - struct GNUNET_CONTAINER_MultiHashMap32 *incoming_channels; - - /** - * 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 - -#endif - -/******************************************************************************/ -/*********************** GLOBAL VARIABLES ****************************/ -/******************************************************************************/ - -/************************** Configuration parameters **************************/ - -/** - * How often to send path keepalives. Paths timeout after 4 missed. - */ -static struct GNUNET_TIME_Relative refresh_connection_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 connections are we willing to maintain. - * Local connections are always allowed, even if there are more connections than max. - */ -static unsigned long long max_connections; - -/** - * How many messages *in total* are we willing to queue, divide by number of - * connections to get connection 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; - -/** - * Connections known, indexed by cid (MeshConnection). - */ -static struct GNUNET_CONTAINER_MultiHashMap *connections; - -/** - * Peers known, indexed by PeerIdentity (MeshPeer). - */ -static struct GNUNET_CONTAINER_MultiHashMap *peers; - -/** - * 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 lib. - */ -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_EccPublicKey my_public_key; - -/** - * 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 MeshPeer 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 MeshPeer * -peer_get (const struct GNUNET_PeerIdentity *peer); - - -/** - * Retrieve the MeshPeer 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 MeshPeer * -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 data structs 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 t Tunnel containing the channel. - * @param chid Public channel number. - * - * @return channel handler, NULL if doesn't exist - */ -static struct MeshChannel * -channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid); - - -/** - * Change the tunnel state. - * - * @param t Tunnel whose state to change. - * @param state New state. - */ -static void -tunnel_change_state (struct MeshTunnel2 *t, enum MeshTunnelState state); - - -/** - * 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 MeshTunnel2 *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. - * - * @return Connection created. - */ -static struct MeshConnection * -tunnel_use_path (struct MeshTunnel2 *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 MeshTunnel2 *t); - -/** - * Destroy the tunnel. - * - * This function does not generate any warning traffic to clients or peers. - * - * Tasks: - * Cancel messages belonging to this tunnel queued to neighbors. - * Free any allocated resources linked to the tunnel. - * - * @param t The tunnel to destroy. - */ -static void -tunnel_destroy (struct MeshTunnel2 *t); - -/** - * Create a connection. - * - * @param cid Connection ID. - */ -static struct MeshConnection * -connection_new (const struct GNUNET_HashCode *cid); - -/** - * Connection is no longer needed: destroy it and remove from tunnel. - * - * @param c Connection to destroy. - */ -static void -connection_destroy (struct MeshConnection *c); - -/** - * Send FWD keepalive packets for a connection. - * - * @param cls Closure (connection for which to send the keepalive). - * @param tc Notification context. - */ -static void -connection_fwd_keepalive (void *cls, - const struct GNUNET_SCHEDULER_TaskContext *tc); - -/** - * Send BCK keepalive packets for a connection. - * - * @param cls Closure (connection for which to send the keepalive). - * @param tc Notification context. - */ -static void -connection_bck_keepalive (void *cls, - const struct GNUNET_SCHEDULER_TaskContext *tc); - - -/** - * Change the tunnel state. - * - * @param c Connection whose state to change. - * @param state New state. - */ -static void -connection_change_state (struct MeshConnection* c, - enum MeshConnectionState state); - - - -/** - * @brief Queue and pass message to core when possible. - * - * @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 c Connection this message belongs to (cannot be NULL). - * @param ch Channel this message belongs to, if applicable (otherwise NULL). - * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!) - */ -static void -queue_add (void* cls, - uint16_t type, - size_t size, - struct MeshConnection* c, - struct MeshChannel* ch, - int fwd); - - -/** - * 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); - - -/** - * 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); - - -/** - * Dummy function to separate declarations from definitions in function list. - */ -void -__mesh_divider______________________________________________________________(); - - -/** - * Get string description for tunnel state. - * - * @param s Tunnel state. - * - * @return String representation. - */ -static const char * -GNUNET_MESH_DEBUG_TS2S (enum MeshTunnelState s) -{ - static char buf[128]; - - switch (s) - { - case MESH_TUNNEL_NEW: - return "MESH_TUNNEL_NEW"; - case MESH_TUNNEL_SEARCHING: - return "MESH_TUNNEL_SEARCHING"; - case MESH_TUNNEL_WAITING: - return "MESH_TUNNEL_WAITING"; - case MESH_TUNNEL_READY: - return "MESH_TUNNEL_READY"; - case MESH_TUNNEL_RECONNECTING: - return "MESH_TUNNEL_RECONNECTING"; - - default: - sprintf (buf, "%u (UNKNOWN STATE)", s); - return buf; - } -} - - -/** - * Get string description for tunnel state. - * - * @param s Tunnel state. - * - * @return String representation. - */ -static const char * -GNUNET_MESH_DEBUG_CS2S (enum MeshTunnelState s) -{ - switch (s) - { - case MESH_CONNECTION_NEW: - return "MESH_CONNECTION_NEW"; - case MESH_CONNECTION_SENT: - return "MESH_CONNECTION_SENT"; - case MESH_CONNECTION_READY: - return "MESH_CONNECTION_READY"; - default: - return "MESH_CONNECTION_STATE_ERROR"; - } -} - - - -/******************************************************************************/ -/************************ 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 ************************/ -/******************************************************************************/ - - -/** - * Get the static string for a peer ID. - * - * @param peer Peer. - * - * @return Static string for it's ID. - */ -static const char * -peer2s (const struct MeshPeer *peer) -{ - if (NULL == peer) - return "(NULL)"; - return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id)); -} - - -/** - * Get the previous hop in a connection - * - * @param c Connection. - * - * @return Previous peer in the connection. - */ -static struct MeshPeer * -connection_get_prev_hop (struct MeshConnection *c) -{ - GNUNET_PEER_Id id; - - if (0 == c->own_pos || c->path->length < 2) - id = c->path->peers[0]; - else - id = c->path->peers[c->own_pos - 1]; - - return peer_get_short (id); -} - - -/** - * Get the next hop in a connection - * - * @param c Connection. - * - * @return Next peer in the connection. - */ -static struct MeshPeer * -connection_get_next_hop (struct MeshConnection *c) -{ - GNUNET_PEER_Id id; - - if ((c->path->length - 1) == c->own_pos || c->path->length < 2) - id = c->path->peers[c->path->length - 1]; - else - id = c->path->peers[c->own_pos + 1]; - - return peer_get_short (id); -} - - -/** - * Get the hop in a connection. - * - * @param c Connection. - * @param fwd Next hop? - * - * @return Next peer in the connection. - */ -static struct MeshPeer * -connection_get_hop (struct MeshConnection *c, int fwd) -{ - if (fwd) - return connection_get_next_hop (c); - return connection_get_prev_hop (c); -} - -/** - * 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). - * - * @param c Client whose tunnel to delete. - * @param ch Channel which should be deleted. - */ -static void -client_delete_channel (struct MeshClient *c, struct MeshChannel *ch) -{ - int res; - - if (c == ch->root) - { - res = GNUNET_CONTAINER_multihashmap32_remove (c->own_channels, - ch->lid_root, ch); - if (GNUNET_YES != res) - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_channel owner KO\n"); - } - if (c == ch->dest) - { - res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels, - ch->lid_dest, ch); - if (GNUNET_YES != res) - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n"); - } -} - - -/** - * Notify the appropriate client that a new incoming channel was created. - * - * @param ch Channel that was created. - */ -static void -send_local_channel_create (struct MeshChannel *ch) -{ - struct GNUNET_MESH_ChannelMessage msg; - struct MeshTunnel2 *t = ch->t; - - if (NULL == ch->dest) - return; - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE); - msg.channel_id = htonl (ch->lid_dest); - msg.port = htonl (ch->port); - msg.opt = 0; - msg.opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0; - msg.opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0; - msg.opt = htonl (msg.opt); - GNUNET_PEER_resolve (t->peer->id, &msg.peer); - GNUNET_SERVER_notification_context_unicast (nc, ch->dest->handle, - &msg.header, GNUNET_NO); -} - - -/** - * Notify a client that the incoming tunnel is no longer valid. - * - * @param ch Channel that is destroyed. - * @param fwd Forward notification (owner->dest)? - */ -static void -send_local_channel_destroy (struct MeshChannel *ch, int fwd) -{ - struct GNUNET_MESH_ChannelMessage msg; - struct MeshClient *c; - - c = fwd ? ch->dest : ch->root; - if (NULL == c) - { - GNUNET_break (0); - return; - } - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); - msg.channel_id = htonl (fwd ? ch->lid_dest : ch->lid_root); - msg.port = htonl (0); - memset (&msg.peer, 0, sizeof (msg.peer)); - msg.opt = htonl (0); - GNUNET_SERVER_notification_context_unicast (nc, c->handle, - &msg.header, GNUNET_NO); -} - - -/** - * Build a local ACK message and send it to a local client. - * - * @param ch Channel on which to send the ACK. - * @param c Client to whom send the ACK. - * @param fwd Set to GNUNET_YES for FWD ACK (dest->owner) - */ -static void -send_local_ack (struct MeshChannel *ch, - struct MeshClient *c, - int fwd) -{ - struct GNUNET_MESH_LocalAck msg; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "send local %s ack on %s:%X towards %p\n", - fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid, c); - - if (NULL == c - || ( fwd && (0 == ch->lid_root || c != ch->root)) - || (!fwd && (0 == ch->lid_dest || c != ch->dest)) ) - { - GNUNET_break (0); - return; - } - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK); - msg.channel_id = htonl (fwd ? ch->lid_root : ch->lid_dest); - GNUNET_SERVER_notification_context_unicast (nc, - c->handle, - &msg.header, - GNUNET_NO); - if (fwd) - ch->blocked_fwd = GNUNET_NO; - else - ch->blocked_bck = GNUNET_NO; -} - - -/** - * Count established (ready) connections of a tunnel. - * - * @param t Tunnel on which to send the message. - * - * @return Number of connections. - */ -static unsigned int -tunnel_count_connections (struct MeshTunnel2 *t) -{ - struct MeshConnection *c; - unsigned int i; - - for (c = t->connection_head, i = 0; NULL != c; c = c->next, i++); - - return i; -} - - -/** - * Pick a connection on which send the next data message. - * - * @param t Tunnel on which to send the message. - * @param fwd Is this a fwd message? - * - * @return The connection on which to send the next message. - */ -static struct MeshConnection * -tunnel_get_connection (struct MeshTunnel2 *t, int fwd) -{ - struct MeshConnection *c; - struct MeshConnection *best; - struct MeshFlowControl *fc; - unsigned int lowest_q; - - best = NULL; - lowest_q = UINT_MAX; - for (c = t->connection_head; NULL != c; c = c->next) - { - if (MESH_CONNECTION_READY == c->state) - { - fc = fwd ? &c->fwd_fc : &c->bck_fc; - if (NULL == fc) - { - GNUNET_break (0); - continue; - } - if (fc->queue_n < lowest_q) - { - best = c; - lowest_q = fc->queue_n; - } - } - } - return best; -} - - -/** - * Get the total buffer space for a tunnel. - */ -static unsigned int -tunnel_get_buffer (struct MeshTunnel2 *t, int fwd) -{ - struct MeshConnection *c; - struct MeshFlowControl *fc; - unsigned int buffer; - - for (buffer = 0, c = t->connection_head; NULL != c; c = c->next) - { - if (c->state != MESH_CONNECTION_READY) - continue; - - fc = fwd ? &c->fwd_fc : &c->bck_fc; - buffer += fc->last_ack_recv - fc->last_pid_sent; - } - - return buffer; -} - - -/** - * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME - * Encrypt data with the tunnel key. - * - * @param t Tunnel whose key to use. - * @param dst Destination for the encrypted data. - * @param src Source of the plaintext. - * @param size Size of the plaintext. - * @param iv Initialization Vector to use. - * @param fwd Is this a fwd message? - */ -static void -tunnel_encrypt (struct MeshTunnel2 *t, - void *dst, const void *src, - size_t size, uint64_t iv, int fwd) -{ - memcpy (dst, src, size); -} - - -/** - * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME - * Decrypt data with the tunnel key. - * - * @param t Tunnel whose key to use. - * @param dst Destination for the plaintext. - * @param src Source of the encrypted data. - * @param size Size of the encrypted data. - * @param iv Initialization Vector to use. - * @param fwd Is this a fwd message? - */ -static void -tunnel_decrypt (struct MeshTunnel2 *t, - void *dst, const void *src, - size_t size, uint64_t iv, int fwd) -{ - memcpy (dst, src, size); -} - - -/** - * Sends an already built message on a connection, properly registering - * all used resources. - * - * @param message Message to send. Function makes a copy of it. - * If message is not hop-by-hop, decrements TTL of copy. - * @param c Connection on which this message is transmitted. - * @param ch Channel on which this message is transmitted, or NULL. - * @param fwd Is this a fwd message? - */ -static void -send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message, - struct MeshConnection *c, - struct MeshChannel *ch, - int fwd) -{ - void *data; - size_t size; - uint16_t type; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Connection %s\n", - GNUNET_h2s (&c->id)); - - size = ntohs (message->size); - data = GNUNET_malloc (size); - memcpy (data, message, size); - type = ntohs (message->type); - - switch (type) - { - struct GNUNET_MESH_Encrypted *emsg; - struct GNUNET_MESH_ACK *amsg; - struct GNUNET_MESH_Poll *pmsg; - uint32_t ttl; - - case GNUNET_MESSAGE_TYPE_MESH_FWD: - case GNUNET_MESSAGE_TYPE_MESH_BCK: - emsg = (struct GNUNET_MESH_Encrypted *) data; - ttl = ntohl (emsg->ttl); - if (0 == ttl) - { - GNUNET_break_op (0); - return; - } - emsg->cid = c->id; - emsg->ttl = htonl (ttl - 1); - emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid)); - break; - - case GNUNET_MESSAGE_TYPE_MESH_ACK: - amsg = (struct GNUNET_MESH_ACK *) data; - amsg->cid = c->id; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack)); - break; - - case GNUNET_MESSAGE_TYPE_MESH_POLL: - pmsg = (struct GNUNET_MESH_Poll *) data; - pmsg->cid = c->id; - pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid)); - break; - - default: - GNUNET_break (0); - } - - queue_add (data, - type, - size, - c, - ch, - fwd); -} - - -/** - * Sends an already built message on a tunnel, choosing the best connection. - * - * @param message Message to send. Function modifies it. - * @param t Tunnel on which this message is transmitted. - * @param ch Channel on which this message is transmitted. - * @param fwd Is this a fwd message? - */ -static void -send_prebuilt_message_tunnel (struct GNUNET_MESH_Encrypted *msg, - struct MeshTunnel2 *t, - struct MeshChannel *ch, - int fwd) -{ - struct MeshConnection *c; - uint16_t type; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n", - peer2s (t->peer)); - c = tunnel_get_connection (t, fwd); - if (NULL == c) - { - GNUNET_break (GNUNET_YES == t->destroy); - return; - } - type = ntohs (msg->header.type); - switch (type) - { - case GNUNET_MESSAGE_TYPE_MESH_FWD: - case GNUNET_MESSAGE_TYPE_MESH_BCK: - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE: - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY: - msg->cid = c->id; - msg->ttl = htonl (default_ttl); - break; - default: - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n", - GNUNET_MESH_DEBUG_M2S (type)); - GNUNET_break (0); - } - - send_prebuilt_message_connection (&msg->header, c, ch, fwd); -} - - -/** - * Sends an already built message on a channel, properly registering - * all used resources and encrypting the message with the tunnel's key. - * - * @param message Message to send. Function makes a copy of it. - * @param ch Channel on which this message is transmitted. - * @param fwd Is this a fwd message? - */ -static void -send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message, - struct MeshChannel *ch, - int fwd) -{ - struct GNUNET_MESH_Encrypted *msg; - size_t size = ntohs (message->size); - char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size]; - uint16_t type; - uint64_t iv; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Channel %s:%X\n", - peer2s (ch->t->peer), ch->gid); - type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK; - iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX); - - msg = (struct GNUNET_MESH_Encrypted *) cbuf; - msg->header.type = htons (type); - msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size); - msg->iv = GNUNET_htonll (iv); - tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd); - - send_prebuilt_message_tunnel (msg, ch->t, ch, fwd); -} - - -/** - * Sends a CREATE CONNECTION message for a path to a peer. - * Changes the connection and tunnel states if necessary. - * - * @param connection Connection to create. - */ -static void -send_connection_create (struct MeshConnection *connection) -{ - struct MeshTunnel2 *t; - - t = connection->t; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n"); - queue_add (NULL, - GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE, - sizeof (struct GNUNET_MESH_ConnectionCreate) + - (connection->path->length * - sizeof (struct GNUNET_PeerIdentity)), - connection, - NULL, - GNUNET_YES); - if (NULL != t && - (MESH_TUNNEL_SEARCHING == t->state || MESH_TUNNEL_NEW == t->state)) - tunnel_change_state (t, MESH_TUNNEL_WAITING); - if (MESH_CONNECTION_NEW == connection->state) - connection_change_state (connection, MESH_CONNECTION_SENT); -} - - -/** - * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE - * directed to us. - * - * @param connection Connection to confirm. - * @param fwd Is this a fwd ACK? (First is bck (SYNACK), second is fwd (ACK)) - */ -static void -send_connection_ack (struct MeshConnection *connection, int fwd) -{ - struct MeshTunnel2 *t; - - t = connection->t; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n"); - queue_add (NULL, - GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK, - sizeof (struct GNUNET_MESH_ConnectionACK), - connection, - NULL, - fwd); - if (MESH_TUNNEL_NEW == t->state) - tunnel_change_state (t, MESH_TUNNEL_WAITING); -} - - -/** - * Build a hop-by-hop ACK message and queue it to send for the given connection. - * - * @param c Which connection to send the hop-by-hop ACK. - * @param ack Value of the ACK. - * @param fwd Is this fwd? - */ -static void -send_ack (struct MeshConnection *c, uint32_t ack, int fwd) -{ - struct GNUNET_MESH_ACK msg; - - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK); - msg.ack = htonl (ack); - msg.cid = c->id; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "connection send %s ack %u on %s\n", - fwd ? "FWD" : "BCK", ack, GNUNET_h2s (&c->id)); - - send_prebuilt_message_connection (&msg.header, c, NULL, fwd); -} - - -/** - * 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; -} - - -/** - * Function to send a create connection message to a peer. - * - * @param c Connection to create. - * @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_connection_create (struct MeshConnection *c, size_t size, void *buf) -{ - struct GNUNET_MESH_ConnectionCreate *msg; - struct GNUNET_PeerIdentity *peer_ptr; - struct MeshPeerPath *p = c->path; - size_t size_needed; - int i; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n"); - size_needed = - sizeof (struct GNUNET_MESH_ConnectionCreate) + - p->length * sizeof (struct GNUNET_PeerIdentity); - - if (size < size_needed || NULL == buf) - { - GNUNET_break (0); - return 0; - } - msg = (struct GNUNET_MESH_ConnectionCreate *) buf; - msg->header.size = htons (size_needed); - msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE); - msg->cid = c->id; - - 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, - "CONNECTION CREATE (%u bytes long) sent!\n", size_needed); - return size_needed; -} - - -/** - * Creates a path ack message in buf and frees all unused resources. - * - * @param c Connection to send an ACK on. - * @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_connection_ack (struct MeshConnection *c, size_t size, void *buf) -{ - struct GNUNET_MESH_ConnectionACK *msg = buf; - struct MeshTunnel2 *t = c->t; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n"); - GNUNET_assert (NULL != t); - if (sizeof (struct GNUNET_MESH_ConnectionACK) > size) - { - GNUNET_break (0); - return 0; - } - msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK)); - msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK); - msg->cid = c->id; - - /* TODO add signature */ - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n"); - return sizeof (struct GNUNET_MESH_ConnectionACK); -} - - -/** - * Destroy the peer_info and free any allocated resources linked to it - * - * @param peer The peer_info to destroy. - * - * @return GNUNET_OK on success - */ -static int -peer_destroy (struct MeshPeer *peer) -{ - struct GNUNET_PeerIdentity id; - struct MeshPeerPath *p; - struct MeshPeerPath *nextp; - - GNUNET_PEER_resolve (peer->id, &id); - GNUNET_PEER_change_rc (peer->id, -1); - - if (GNUNET_YES != - GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, peer)) - { - GNUNET_break (0); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "removing peer %s, not in hashmap\n", GNUNET_i2s (&id)); - } - if (NULL != peer->dhtget) - { - GNUNET_DHT_get_stop (peer->dhtget); - } - p = peer->path_head; - while (NULL != p) - { - nextp = p->next; - GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p); - path_destroy (p); - p = nextp; - } - tunnel_destroy_empty (peer->tunnel); - GNUNET_free (peer); - return GNUNET_OK; -} - - -/** - * Returns if peer is used (has a tunnel, is neighbor). - * - * @peer Peer to check. - * - * @return GNUNET_YES if peer is in use. - */ -static int -peer_is_used (struct MeshPeer *peer) -{ - struct MeshPeerPath *p; - - if (NULL != peer->tunnel) - return GNUNET_YES; - - for (p = peer->path_head; NULL != p; p = p->next) - { - if (p->length < 3) - return GNUNET_YES; - } - return GNUNET_NO; -} - -/** - * Iterator over all the peers to get the oldest timestamp. - * - * @param cls Closure (unsued). - * @param key ID of the peer. - * @param value Peer_Info of the peer. - */ -static int -peer_get_oldest (void *cls, - const struct GNUNET_HashCode *key, - void *value) -{ - struct MeshPeer *p = value; - struct GNUNET_TIME_Absolute *abs = cls; - - /* Don't count active peers */ - if (GNUNET_YES == peer_is_used (p)) - return GNUNET_YES; - - if (abs->abs_value_us < p->last_contact.abs_value_us) - abs->abs_value_us = p->last_contact.abs_value_us; - - return GNUNET_YES; -} - - -/** - * Iterator over all the peers to remove the oldest entry. - * - * @param cls Closure (unsued). - * @param key ID of the peer. - * @param value Peer_Info of the peer. - */ -static int -peer_timeout (void *cls, - const struct GNUNET_HashCode *key, - void *value) -{ - struct MeshPeer *p = value; - struct GNUNET_TIME_Absolute *abs = cls; - - if (p->last_contact.abs_value_us == abs->abs_value_us && - GNUNET_NO == peer_is_used (p)) - { - peer_destroy (p); - return GNUNET_NO; - } - return GNUNET_YES; -} - - -/** - * Delete oldest unused peer. - */ -static void -peer_delete_oldest (void) -{ - struct GNUNET_TIME_Absolute abs; - - abs = GNUNET_TIME_UNIT_FOREVER_ABS; - - GNUNET_CONTAINER_multihashmap_iterate (peers, - &peer_get_oldest, - &abs); - GNUNET_CONTAINER_multihashmap_iterate (peers, - &peer_timeout, - &abs); -} - - -/** - * Retrieve the MeshPeer 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 MeshPeer * -peer_get (const struct GNUNET_PeerIdentity *peer_id) -{ - struct MeshPeer *peer; - - peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer_id->hashPubKey); - if (NULL == peer) - { - peer = GNUNET_new (struct MeshPeer); - if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers) - { - peer_delete_oldest (); - } - GNUNET_CONTAINER_multihashmap_put (peers, &peer_id->hashPubKey, peer, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); - peer->id = GNUNET_PEER_intern (peer_id); - } - peer->last_contact = GNUNET_TIME_absolute_get(); - - return peer; -} - - -/** - * Retrieve the MeshPeer 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 MeshPeer * -peer_get_short (const GNUNET_PEER_Id peer) -{ - return peer_get (GNUNET_PEER_resolve2 (peer)); -} - - -/** - * Get a cost of a path for a peer considering existing tunnel connections. - * - * @param peer Peer towards which the path is considered. - * @param path Candidate path. - * - * @return Cost of the path (path length + number of overlapping nodes) - */ -static unsigned int -peer_get_path_cost (const struct MeshPeer *peer, - const struct MeshPeerPath *path) -{ - struct MeshConnection *c; - unsigned int overlap; - unsigned int i; - unsigned int j; - - if (NULL == path) - return 0; - - overlap = 0; - GNUNET_assert (NULL != peer->tunnel); - - for (i = 0; i < path->length; i++) - { - for (c = peer->tunnel->connection_head; NULL != c; c = c->next) - { - for (j = 0; j < c->path->length; j++) - { - if (path->peers[i] == c->path->peers[j]) - { - overlap++; - break; - } - } - } - } - return (path->length + overlap) * (path->score * -1); -} - - -/** - * Choose the best path towards a peer considering the tunnel properties. - * - * @param peer The destination peer. - * - * @return Best current known path towards the peer, if any. - */ -static struct MeshPeerPath * -peer_get_best_path (const struct MeshPeer *peer) -{ - struct MeshPeerPath *best_p; - struct MeshPeerPath *p; - struct MeshConnection *c; - unsigned int best_cost; - unsigned int cost; - - best_cost = UINT_MAX; - best_p = NULL; - for (p = peer->path_head; NULL != p; p = p->next) - { - for (c = peer->tunnel->connection_head; NULL != c; c = c->next) - if (c->path == p) - break; - if (NULL != c) - continue; /* If path is in use in a connection, skip it. */ - - if ((cost = peer_get_path_cost (peer, p)) < best_cost) - { - best_cost = cost; - best_p = p; - } - } - return best_p; -} - -static int -queue_is_sendable (struct MeshPeerQueue *q) -{ - struct MeshFlowControl *fc; - - /* Is PID-independent? */ - switch (q->type) - { - case GNUNET_MESSAGE_TYPE_MESH_ACK: - case GNUNET_MESSAGE_TYPE_MESH_POLL: - return GNUNET_YES; - } - - /* Is PID allowed? */ - fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc; - if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent)) - return GNUNET_YES; - - return GNUNET_NO; -} - - -/** - * Get first sendable message. - * - * @param peer The destination peer. - * - * @return Best current known path towards the peer, if any. - */ -static struct MeshPeerQueue * -peer_get_first_message (const struct MeshPeer *peer) -{ - struct MeshPeerQueue *q; - - for (q = peer->queue_head; NULL != q; q = q->next) - { - if (queue_is_sendable (q)) - return q; - } - - return NULL; -} - - -/** - * 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 CONNECTION towards it. - * - * @param peer PeerInfo of the peer. - */ -static void -peer_connect (struct MeshPeer *peer) -{ - struct MeshTunnel2 *t; - struct MeshPeerPath *p; - struct MeshConnection *c; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "peer_connect towards %s\n", - peer2s (peer)); - t = peer->tunnel; - if (NULL != peer->path_head) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "path exists\n"); - p = peer_get_best_path (peer); - if (NULL != p) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u hops\n", p->length); - c = tunnel_use_path (t, p); - send_connection_create (c); - } - } - else if (NULL == peer->dhtget) - { - const struct GNUNET_PeerIdentity *id; - - id = GNUNET_PEER_resolve2 (peer->id); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " Starting DHT GET for peer %s\n", peer2s (peer)); - 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); - if (MESH_TUNNEL_NEW == t->state) - tunnel_change_state (t, MESH_TUNNEL_SEARCHING); - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "There is no path but the DHT GET is already started.\n"); - } -} - - -/** - * Get the first transmittable message for a connection. - * - * @param c Connection. - * @param fwd Is this FWD? - * - * @return First transmittable message. - */ -static struct MeshPeerQueue * -connection_get_first_message (struct MeshConnection *c, int fwd) -{ - struct MeshPeerQueue *q; - struct MeshPeer *p; - - p = connection_get_hop (c, fwd); - - for (q = p->queue_head; NULL != q; q = q->next) - { - if (q->c != c) - continue; - if (queue_is_sendable (q)) - return q; - } - - return NULL; -} - - -/** - * Is this peer the first one on the connection? - * - * @param c Connection. - * @param fwd Is this about fwd traffic? - * - * @return GNUNET_YES if origin, GNUNET_NO if relay/terminal. - */ -static int -connection_is_origin (struct MeshConnection *c, int fwd) -{ - if (!fwd && c->own_pos == c->path->length - 1) - return GNUNET_YES; - if (fwd && c->own_pos == 0) - return GNUNET_YES; - return GNUNET_NO; -} - - -/** - * Is this peer the last one on the connection? - * - * @param c Connection. - * @param fwd Is this about fwd traffic? - * Note that the ROOT is the terminal for BCK traffic! - * - * @return GNUNET_YES if terminal, GNUNET_NO if relay/origin. - */ -static int -connection_is_terminal (struct MeshConnection *c, int fwd) -{ - if (fwd && c->own_pos == c->path->length - 1) - return GNUNET_YES; - if (!fwd && c->own_pos == 0) - return GNUNET_YES; - return GNUNET_NO; -} - - -/** - * @brief Re-initiate traffic on this connection 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 c Connection on which initiate traffic. - * @param fwd Is this about fwd traffic? - */ -static void -connection_unlock_queue (struct MeshConnection *c, int fwd) -{ - struct MeshPeer *peer; - struct MeshPeerQueue *q; - size_t size; - - peer = connection_get_hop (c, fwd); - - if (NULL != peer->core_transmit) - return; /* Already unlocked */ - - q = connection_get_first_message (c, fwd); - if (NULL == q) - return; /* Nothing to transmit */ - - size = q->size; - peer->core_transmit = - GNUNET_CORE_notify_transmit_ready (core_handle, - GNUNET_NO, - 0, - GNUNET_TIME_UNIT_FOREVER_REL, - GNUNET_PEER_resolve2 (peer->id), - size, - &queue_send, - peer); -} - - -/** - * Cancel all transmissions that belong to a certain connection. - * - * @param c Connection which to cancel. - * @param fwd Cancel fwd traffic? - */ -static void -connection_cancel_queues (struct MeshConnection *c, int fwd) -{ - struct MeshPeerQueue *q; - struct MeshPeerQueue *next; - struct MeshFlowControl *fc; - struct MeshPeer *peer; - - if (NULL == c) - { - GNUNET_break (0); - return; - } - fc = fwd ? &c->fwd_fc : &c->bck_fc; - peer = connection_get_hop (c, fwd); - - for (q = peer->queue_head; NULL != q; q = next) - { - next = q->next; - if (q->c == c) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "connection_cancel_queue %s\n", - GNUNET_MESH_DEBUG_M2S (q->type)); - queue_destroy (q, GNUNET_YES); - } - } - if (NULL == peer->queue_head) - { - if (NULL != peer->core_transmit) - { - GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit); - peer->core_transmit = NULL; - } - if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task) - { - GNUNET_SCHEDULER_cancel (fc->poll_task); - fc->poll_task = GNUNET_SCHEDULER_NO_TASK; - } - } -} - - -/** - * 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 MeshPeer *peer, GNUNET_PEER_Id p1, - GNUNET_PEER_Id p2) -{ - struct MeshPeerPath *p; - struct MeshPeerPath *next; - struct MeshPeer *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; - - - d = tunnel_notify_connection_broken (peer->tunnel, p1, p2); - - peer_d = peer_get_short (d); // FIXME - next = peer_get_best_path (peer_d); - tunnel_use_path (peer->tunnel, next); - peer_connect (peer_d); - - 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_add_path (struct MeshPeer *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)); - } - } - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n", - path->length, peer2s (peer_info)); - - 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_add_path_to_origin (struct MeshPeer *peer_info, - struct MeshPeerPath *path, int trusted) -{ - path_invert (path); - peer_add_path (peer_info, path, trusted); -} - - - -/** - * Function called if a connection has been stalled for a while, - * possibly due to a missed ACK. Poll the neighbor about its ACK status. - * - * @param cls Closure (poll ctx). - * @param tc TaskContext. - */ -static void -connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) -{ - struct MeshFlowControl *fc = cls; - struct GNUNET_MESH_Poll msg; - struct MeshConnection *c; - - fc->poll_task = GNUNET_SCHEDULER_NO_TASK; - if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) - { - return; - } - - c = fc->c; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n"); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection %s[%X]\n", - peer2s (c->t->peer), c->id); - - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL); - msg.header.size = htons (sizeof (msg)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent); - send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc); - fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time); - fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time, - &connection_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 MeshPeer *aux; - struct MeshPeerPath *copy; - - aux = peer_get_short (p->peers[i]); - copy = path_duplicate (p); - copy->length = i + 1; - peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed); - } -} - - -/** - * Search for a channel among the channels for a client - * - * @param c the client whose channels to search in - * @param chid the local id of the channel - * - * @return channel handler, NULL if doesn't exist - */ -static struct MeshChannel * -channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid) -{ - if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI)) - { - GNUNET_break_op (0); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid); - return NULL; - } - if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV) - return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid); - return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid); -} - -/** - * Search for a tunnel by global ID using full PeerIdentities. - * - * @param t Tunnel containing the channel. - * @param chid Public channel number. - * - * @return channel handler, NULL if doesn't exist - */ -static struct MeshChannel * -channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid) -{ - struct MeshChannel *ch; - - if (NULL == t) - return NULL; - - for (ch = t->channel_head; NULL != ch; ch = ch->next) - { - if (ch->gid == chid) - break; - } - - return ch; -} - - -/** - * Change the tunnel state. - * - * @param t Tunnel whose state to change. - * @param state New state. - */ -static void -tunnel_change_state (struct MeshTunnel2* t, enum MeshTunnelState state) -{ - if (NULL == t) - return; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Tunnel %s state was %s\n", - peer2s (t->peer), - GNUNET_MESH_DEBUG_TS2S (t->state)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Tunnel %s state is now %s\n", - peer2s (t->peer), - GNUNET_MESH_DEBUG_TS2S (state)); - t->state = state; -} - - -/** - * Cache a message to be sent once tunnel is online. - * - * @param t Tunnel to hold the message. - * @param ch Channel the message is about. - * @param msg Message itself (copy will be made). - * @param fwd Is this fwd? - */ -static void -tunnel_queue_data (struct MeshTunnel2 *t, - struct MeshChannel *ch, - struct GNUNET_MessageHeader *msg, - int fwd) -{ - struct MeshTunnelQueue *tq; - uint16_t size = ntohs (msg->size); - - tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size); - - tq->ch = ch; - memcpy (&tq[1], msg, size); - GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq); -} - - -/** - * Send all cached messages that we can, tunnel is online. - * - * @param t Tunnel that holds the messages. - * @param fwd Is this fwd? - */ -static void -tunnel_send_queued_data (struct MeshTunnel2 *t, int fwd) -{ - struct MeshTunnelQueue *tq; - struct MeshTunnelQueue *next; - unsigned int room; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "tunnel_send_queued_data on tunnel %s\n", - peer2s (t->peer)); - room = tunnel_get_buffer (t, fwd); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room); - for (tq = t->tq_head; NULL != tq && room > 0; tq = next) - { - next = tq->next; - room--; - GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq); - send_prebuilt_message_channel ((struct GNUNET_MessageHeader *) &tq[1], - tq->ch, fwd); - - GNUNET_free (tq); - } -} - - -static void -connection_change_state (struct MeshConnection* c, - enum MeshConnectionState state) -{ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Connection %s state was %s\n", - GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (c->state)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Connection %s state is now %s\n", - GNUNET_h2s (&c->id), GNUNET_MESH_DEBUG_CS2S (state)); - c->state = state; -} - - -/** - * Add a client to a channel, initializing all needed data structures. - * - * @param ch Channel to which add the client. - * @param c Client which to add to the channel. - */ -static void -channel_add_client (struct MeshChannel *ch, struct MeshClient *c) -{ - struct MeshTunnel2 *t = ch->t; - - if (NULL != ch->dest) - { - GNUNET_break(0); - return; - } - - /* Assign local id as destination */ - while (NULL != channel_get_by_local_id (c, t->next_local_chid)) - t->next_local_chid = (t->next_local_chid + 1) | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV; - ch->lid_dest = t->next_local_chid++; - t->next_local_chid = t->next_local_chid | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV; - - /* Store in client's hashmap */ - if (GNUNET_OK != - GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels, - ch->lid_dest, ch, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) - { - GNUNET_break (0); - return; - } - ch->dest = c; -} - - -static struct MeshConnection * -tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p) -{ - struct MeshConnection *c; - struct GNUNET_HashCode cid; - struct MeshPeer *peer; - unsigned int own_pos; - - GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &cid); - - c = connection_new (&cid); - c->t = t; - 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); - connection_destroy (c); - return NULL; - } - c->own_pos = own_pos; - c->path = p; - - if (0 == own_pos) - { - c->fwd_maintenance_task = - GNUNET_SCHEDULER_add_delayed (refresh_connection_time, - &connection_fwd_keepalive, c); - } - - peer = connection_get_next_hop (c); - GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); - peer = connection_get_prev_hop (c); - GNUNET_CONTAINER_multihashmap_put (peer->connections, &c->id, c, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); - return c; -} - - -/** - * 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. - * - * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME - * - * @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 MeshTunnel2* 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; -} - - -/** - * Send an end-to-end FWD ACK message for the most recent in-sequence payload. - * - * @param ch Channel this is about. - * @param fwd Is for FWD traffic? (ACK dest->owner) - */ -static void -channel_send_data_ack (struct MeshChannel *ch, int fwd) -{ - struct GNUNET_MESH_DataACK msg; - struct MeshChannelReliability *rel; - struct MeshReliableMessage *copy; - unsigned int delta; - uint64_t mask; - uint32_t *mid; - uint16_t type; - - if (GNUNET_NO == ch->reliable) - { - GNUNET_break (0); - return; - } - rel = fwd ? ch->bck_rel : ch->fwd_rel; - mid = fwd ? &ch->mid_recv_fwd : &ch->mid_recv_bck; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "send_data_ack for %u\n", - *mid - 1); - - type = GNUNET_MESSAGE_TYPE_MESH_DATA_ACK; - msg.header.type = htons (type); - msg.header.size = htons (sizeof (msg)); - msg.chid = htonl (ch->gid); - msg.mid = htonl (*mid - 1); - msg.futures = 0; - for (copy = rel->head_recv; NULL != copy; copy = copy->next) - { - if (copy->type != type) - continue; - delta = copy->mid - *mid; - if (63 < delta) - break; - mask = 0x1LL << delta; - msg.futures |= mask; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " setting bit for %u (delta %u) (%llX) -> %llX\n", - copy->mid, delta, mask, msg.futures); - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures); - - send_prebuilt_message_channel (&msg.header, ch, fwd); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n"); -} - - -/** - * Send an ACK informing the predecessor about the available buffer space. - * - * Note that for fwd ack, the FWD mean forward *traffic* (root->dest), - * the ACK itself goes "back" (dest->root). - * - * @param c Connection on which to send the ACK. - * @param fwd Is this FWD ACK? (Going dest->owner) - */ -static void -connection_send_ack (struct MeshConnection *c, int fwd) -{ - struct MeshFlowControl *next_fc; - struct MeshFlowControl *prev_fc; - uint32_t ack; - int delta; - - next_fc = fwd ? &c->fwd_fc : &c->bck_fc; - prev_fc = fwd ? &c->bck_fc : &c->fwd_fc; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "connection send %s ack on %s\n", - fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id)); - - /* Check if we need to transmit the ACK */ - if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n"); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " last pid recv: %u, last ack sent: %u\n", - prev_fc->last_pid_recv, prev_fc->last_ack_sent); - return; - } - - /* Ok, ACK might be necessary, what PID to ACK? */ - delta = next_fc->queue_max - next_fc->queue_n; - ack = prev_fc->last_pid_recv + delta; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " last pid %u, last ack %u, qmax %u, q %u\n", - prev_fc->last_pid_recv, prev_fc->last_ack_sent, - next_fc->queue_max, next_fc->queue_n); - if (ack == prev_fc->last_ack_sent) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n"); - return; - } - - prev_fc->last_ack_sent = ack; - send_ack (c, ack, fwd); -} - - -/** - * Modify the mesh message TID from global to local and send to client. - * - * @param ch Channel 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 -channel_send_client_to_tid (struct MeshChannel *ch, - const struct GNUNET_MESH_Data *msg, - struct MeshClient *c, MESH_ChannelNumber id) -{ - 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->id = htonl (id); - GNUNET_SERVER_notification_context_unicast (nc, c->handle, - ©->header, GNUNET_NO); -} - -/** - * Modify the data message ID from global to local and send to client. - * - * @param ch Channel on which to send the message. - * @param msg Message to modify and send. - * @param fwd Forward? - */ -static void -channel_send_client_data (struct MeshChannel *ch, - const struct GNUNET_MESH_Data *msg, - int fwd) -{ - if (fwd) - channel_send_client_to_tid (ch, msg, ch->dest, ch->lid_dest); - else - channel_send_client_to_tid (ch, msg, ch->root, ch->lid_root); -} - - -/** - * Send a buffered message to the client, for in order delivery or - * as result of client ACK. - * - * @param ch Channel on which to empty the message buffer. - * @param c Client to send to. - * @param rel Reliability structure to corresponding peer. - * If rel == bck_rel, this is FWD data. - */ -static void -channel_send_client_buffered_data (struct MeshChannel *ch, - struct MeshClient *c, - struct MeshChannelReliability *rel) -{ - struct MeshReliableMessage *copy; - uint32_t *mid; - - if (GNUNET_NO == rel->client_ready) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n"); - return; - } - - mid = rel == ch->bck_rel ? &ch->mid_recv_fwd : &ch->mid_recv_bck; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n"); - copy = rel->head_recv; - /* We never buffer channel management messages */ - if (NULL != copy) - { - if (copy->mid == *mid || GNUNET_NO == ch->reliable) - { - struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1]; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " have %u! now expecting %u\n", - copy->mid, *mid + 1); - channel_send_client_data (ch, msg, (rel == ch->bck_rel)); - rel->n_recv--; - *mid = *mid + 1; - GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy); - GNUNET_free (copy); - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " reliable && don't have %u, next is %u\n", - *mid, - copy->mid); - return; - } - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n"); -} - - -/** - * We have received a message out of order, or the client is not ready. - * Buffer it until we receive an ACK from the client or the missing - * message from the channel. - * - * @param msg Message to buffer (MUST be of type MESH_DATA). - * @param rel Reliability data to the corresponding direction. - */ -static void -channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg, - struct MeshChannelReliability *rel) -{ - struct MeshReliableMessage *copy; - struct MeshReliableMessage *prev; - uint32_t mid; - uint16_t size; - - size = ntohs (msg->header.size); - mid = ntohl (msg->mid); - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid); - - copy = GNUNET_malloc (sizeof (*copy) + size); - copy->mid = mid; - copy->rel = rel; - memcpy (©[1], msg, size); - - rel->n_recv++; - - // FIXME do something better than O(n), although n < 64... - // FIXME start from the end (most messages are the latest ones) - for (prev = rel->head_recv; NULL != prev; prev = prev->next) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid); - if (GMC_is_pid_bigger (prev->mid, mid)) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n"); - GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv, - prev, copy); - return; - } - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n"); - GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n"); -} - - -/** - * Destroy a reliable message after it has been acknowledged, either by - * direct mid ACK or bitfield. Updates the appropriate data structures and - * timers and frees all memory. - * - * @param copy Message that is no longer needed: remote peer got it. - */ -static void -rel_message_free (struct MeshReliableMessage *copy) -{ - struct MeshChannelReliability *rel; - struct GNUNET_TIME_Relative time; - - rel = copy->rel; - time = GNUNET_TIME_absolute_get_duration (copy->timestamp); - rel->expected_delay.rel_value_us *= 7; - rel->expected_delay.rel_value_us += time.rel_value_us; - rel->expected_delay.rel_value_us /= 8; - rel->n_sent--; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n", - GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO)); - 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); -} - - -/** - * Destroy all reliable messages queued for a channel, - * during a channel destruction. - * Frees the reliability structure itself. - * - * @param rel Reliability data for a channel. - */ -static void -channel_rel_free_all (struct MeshChannelReliability *rel) -{ - struct MeshReliableMessage *copy; - struct MeshReliableMessage *next; - - if (NULL == rel) - return; - - for (copy = rel->head_recv; NULL != copy; copy = next) - { - next = copy->next; - GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy); - GNUNET_free (copy); - } - for (copy = rel->head_sent; NULL != copy; copy = next) - { - next = copy->next; - GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy); - GNUNET_free (copy); - } - if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task) - GNUNET_SCHEDULER_cancel (rel->retry_task); - GNUNET_free (rel); -} - - -/** - * Mark future messages as ACK'd. - * - * @param rel Reliability data. - * @param msg DataACK message with a bitfield of future ACK'd messages. - */ -static void -channel_rel_free_sent (struct MeshChannelReliability *rel, - const struct GNUNET_MESH_DataACK *msg) -{ - struct MeshReliableMessage *copy; - struct MeshReliableMessage *next; - uint64_t bitfield; - uint64_t mask; - uint32_t mid; - uint32_t target; - unsigned int i; - - bitfield = msg->futures; - mid = ntohl (msg->mid); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "free_sent_reliable %u %llX\n", - mid, bitfield); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " rel %p, head %p\n", - rel, rel->head_sent); - for (i = 0, copy = rel->head_sent; - i < 64 && NULL != copy && 0 != bitfield; - i++) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " trying bit %u (mid %u)\n", - i, mid + i + 1); - mask = 0x1LL << i; - if (0 == (bitfield & mask)) - continue; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n"); - /* Bit was set, clear the bit from the bitfield */ - bitfield &= ~mask; - - /* The i-th bit was set. Do we have that copy? */ - /* Skip copies with mid < target */ - target = mid + i + 1; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target); - while (NULL != copy && GMC_is_pid_bigger (target, copy->mid)) - copy = copy->next; - - /* Did we run out of copies? (previously freed, it's ok) */ - if (NULL == copy) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n"); - return; - } - - /* Did we overshoot the target? (previously freed, it's ok) */ - if (GMC_is_pid_bigger (copy->mid, target)) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid); - continue; - } - - /* Now copy->mid == target, free it */ - next = copy->next; - rel_message_free (copy); - copy = next; - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n"); -} - - -/** - * 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 -channel_retransmit_message (void *cls, - const struct GNUNET_SCHEDULER_TaskContext *tc) -{ - struct MeshChannelReliability *rel = cls; - struct MeshReliableMessage *copy; - struct MeshPeerQueue *q; - struct MeshChannel *ch; - struct MeshConnection *c; - struct GNUNET_MESH_Data *payload; - struct MeshPeer *hop; - int fwd; - - rel->retry_task = GNUNET_SCHEDULER_NO_TASK; - if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) - return; - - ch = rel->ch; - copy = rel->head_sent; - if (NULL == copy) - { - GNUNET_break (0); - return; - } - - /* Search the message to be retransmitted in the outgoing queue. - * Check only the queue for the connection that is going to be used, - * if the message is stuck in some other connection's queue we shouldn't - * act upon it: - * - cancelling it and sending the new one doesn't guarantee it's delivery, - * the old connection could be temporary stalled or the queue happened to - * be long at time of insertion. - * - not sending the new one could cause terrible delays the old connection - * is stalled. - */ - payload = (struct GNUNET_MESH_Data *) ©[1]; - fwd = (rel == ch->fwd_rel); - c = tunnel_get_connection (ch->t, fwd); - hop = connection_get_hop (c, fwd); - for (q = hop->queue_head; NULL != q; q = q->next) - { - if (ntohs (payload->header.type) == q->type && ch == q->ch) - { - struct GNUNET_MESH_Data *queued_data = q->cls; - - if (queued_data->mid == payload->mid) - break; - } - } - - /* Message not found in the queue that we are going to use. */ - if (NULL == q) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid); - - send_prebuilt_message_channel (&payload->header, ch, ch->fwd_rel == rel); - GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO); - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid); - } - - rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer); - rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer, - &channel_retransmit_message, - cls); -} - - -/** - * Send an ACK to a client if needed. - * - * @param ch Channel this is regarding. - * @param fwd Is this about fwd traffic? (ACk goes the opposite direction). - */ -static void -channel_send_client_ack (struct MeshChannel *ch, int fwd) -{ - struct MeshClient *c; - int blocked; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Channel send client %s ack on %s:%X\n", - fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid); - - /* Check for buffer space */ - if (0 >= tunnel_get_buffer (ch->t, fwd)) - return; - - /* Client to receive the ACK (fwd indicates traffic to be ACK'd) */ - c = fwd ? ch->root : ch->dest; - - blocked = fwd ? ch->blocked_fwd : ch->blocked_bck; - if (GNUNET_YES == blocked) - send_local_ack (ch, c, fwd); - else - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client not blocked\n"); -} - - -/** - * Send ACK on one or more connections due to buffer space to the client. - * - * @param ch Channel which has some free buffer space. - * @param buffer Buffer space. - * @param fwd Is this in the FWD direction? - */ -static void -channel_send_connection_ack (struct MeshChannel *ch, uint32_t buffer, int fwd) -{ - struct MeshTunnel2 *t = ch->t; - struct MeshConnection *c; - struct MeshFlowControl *fc; - uint32_t allowed; - uint32_t to_allow; - unsigned int cs; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Channel send connection %s ack on %s:%X\n", - fwd ? "FWD" : "BCK", peer2s (ch->t->peer), ch->gid); - - /* Count connections, how many messages are already allowed */ - for (cs = 0, allowed = 0, c = t->connection_head; NULL != c; c = c->next) - { - fc = fwd ? &c->fwd_fc : &c->bck_fc; - if (GMC_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent)) - { - GNUNET_break (0); - continue; - } - allowed += fc->last_ack_sent - fc->last_pid_recv; - cs++; - } - - /* Make sure there is no overflow */ - if (allowed > buffer) - { - GNUNET_break (0); - return; - } - - /* Authorize connections to send more data */ - to_allow = buffer - allowed; - for (c = t->connection_head; NULL != c && to_allow > 0; c = c->next) - { - fc = fwd ? &c->fwd_fc : &c->bck_fc; - if (fc->last_ack_sent - fc->last_pid_recv > 64 / 3) - { - continue; - } - send_ack (c, fc->last_ack_sent + 1, fwd); - to_allow--; - } - - GNUNET_break (to_allow == 0); -} - - -/** - * Channel was ACK'd by remote peer, mark as ready and cancel retransmission. - * - * @param ch Channel to mark as ready. - * @param fwd Was the CREATE message sent fwd? - */ -static void -channel_confirm (struct MeshChannel *ch, int fwd) -{ - struct MeshChannelReliability *rel; - struct MeshReliableMessage *copy; - struct MeshReliableMessage *next; - - ch->state = MESH_CHANNEL_READY; - - rel = fwd ? ch->fwd_rel : ch->bck_rel; - for (copy = rel->head_sent; NULL != copy; copy = next) - { - struct GNUNET_MessageHeader *msg; - - next = copy->next; - msg = (struct GNUNET_MessageHeader *) ©[1]; - if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE) - { - rel_message_free (copy); - /* TODO return? */ - } - } -} - - -/** - * Save a copy to retransmit in case it gets lost. - * - * Initializes all needed callbacks and timers. - * - * @param ch Channel this message goes on. - * @param msg Message to copy. - * @param fwd Is this fwd traffic? - */ -static void -channel_save_copy (struct MeshChannel *ch, - const struct GNUNET_MessageHeader *msg, - int fwd) -{ - struct MeshChannelReliability *rel; - struct MeshReliableMessage *copy; - uint32_t mid; - uint16_t type; - uint16_t size; - - rel = fwd ? ch->fwd_rel : ch->bck_rel; - mid = fwd ? ch->mid_send_fwd : ch->mid_send_bck; - type = ntohs (msg->type); - size = ntohs (msg->size); - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! SAVE %u\n", mid); - copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + size); - copy->mid = mid; - copy->timestamp = GNUNET_TIME_absolute_get (); - copy->rel = rel; - copy->type = type; - memcpy (©[1], msg, size); - rel->n_sent++; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent); - GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy); - if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task) - { - rel->retry_timer = - GNUNET_TIME_relative_multiply (rel->expected_delay, - MESH_RETRANSMIT_MARGIN); - rel->retry_task = - GNUNET_SCHEDULER_add_delayed (rel->retry_timer, - &channel_retransmit_message, - rel); - } -} - - -/** - * Send keepalive packets for a connection. - * - * @param c Connection to keep alive.. - * @param fwd Is this a FWD keepalive? (owner -> dest). - */ -static void -connection_keepalive (struct MeshConnection *c, int fwd) -{ - struct GNUNET_MESH_ConnectionKeepAlive *msg; - size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive); - char cbuf[size]; - uint16_t type; - - type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE : - GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "sending %s keepalive for connection %s[%d]\n", - fwd ? "FWD" : "BCK", - peer2s (c->t->peer), - c->id); - - msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf; - msg->header.size = htons (size); - msg->header.type = htons (type); - msg->cid = c->id; - - send_prebuilt_message_connection (&msg->header, c, NULL, fwd); -} - - -/** - * Send CONNECTION_{CREATE/ACK} packets for a connection. - * - * @param c Connection for which to send the message. - * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK. - */ -static void -connection_recreate (struct MeshConnection *c, int fwd) -{ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n"); - if (fwd) - send_connection_create (c); - else - send_connection_ack (c, GNUNET_NO); -} - - -/** - * Generic connection timer management. - * Depending on the role of the peer in the connection will send the - * appropriate message (build or keepalive) - * - * @param c Conncetion to maintain. - * @param fwd Is FWD? - */ -static void -connection_maintain (struct MeshConnection *c, int fwd) -{ - if (MESH_TUNNEL_SEARCHING == c->t->state) - { - /* TODO DHT GET with RO_BART */ - return; - } - switch (c->state) - { - case MESH_CONNECTION_NEW: - GNUNET_break (0); - case MESH_CONNECTION_SENT: - connection_recreate (c, fwd); - break; - case MESH_CONNECTION_READY: - connection_keepalive (c, fwd); - break; - default: - break; - } -} - - -static void -connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) -{ - struct MeshConnection *c = cls; - - c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK; - if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) - return; - - connection_maintain (c, GNUNET_YES); - c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, - &connection_fwd_keepalive, - c); -} - - -static void -connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) -{ - struct MeshConnection *c = cls; - - c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK; - if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) - return; - - connection_maintain (c, GNUNET_NO); - c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, - &connection_bck_keepalive, - c); -} - - -/** - * Send a message to all peers in this connection that the connection - * is no longer valid. - * - * If some peer should not receive the message, it should be zero'ed out - * before calling this function. - * - * @param c The connection whose peers to notify. - */ -static void -connection_send_destroy (struct MeshConnection *c) -{ - struct GNUNET_MESH_ConnectionDestroy msg; - - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);; - msg.cid = c->id; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " sending connection destroy for connection %s[%X]\n", - peer2s (c->t->peer), - c->id); - - send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES); - send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO); - c->destroy = GNUNET_YES; -} - - -/** - * Confirm we got a channel create. - * - * @param ch The channel to confirm. - * @param fwd Should we send the ACK fwd? - */ -static void -channel_send_ack (struct MeshChannel *ch, int fwd) -{ - struct GNUNET_MESH_ChannelManage msg; - - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " sending channel ack for channel %s:%X\n", - peer2s (ch->t->peer), - ch->gid); - - msg.chid = htonl (ch->gid); - send_prebuilt_message_channel (&msg.header, ch, fwd); -} - - -/** - * Send a message to all clients (local and remote) of this channel - * notifying that the channel is no longer valid. - * - * If some peer or client should not receive the message, - * should be zero'ed out before calling this function. - * - * @param ch The channel whose clients to notify. - */ -static void -channel_send_destroy (struct MeshChannel *ch) -{ - struct GNUNET_MESH_ChannelManage msg; - - msg.header.size = htons (sizeof (msg)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " sending channel destroy for channel %s:%X\n", - peer2s (ch->t->peer), - ch->gid); - - if (NULL != ch->root) - { - msg.chid = htonl (ch->lid_root); - send_local_channel_destroy (ch, GNUNET_NO); - } - else - { - msg.chid = htonl (ch->gid); - send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO); - } - - if (NULL != ch->dest) - { - msg.chid = htonl (ch->lid_dest); - send_local_channel_destroy (ch, GNUNET_YES); - } - else - { - msg.chid = htonl (ch->gid); - send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES); - } -} - - -/** - * Create a tunnel. - */ -static struct MeshTunnel2 * -tunnel_new (void) -{ - struct MeshTunnel2 *t; - - t = GNUNET_new (struct MeshTunnel2); - t->next_chid = 0; - t->next_local_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV; -// if (GNUNET_OK != -// GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t, -// GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) -// { -// GNUNET_break (0); -// tunnel_destroy (t); -// return NULL; -// } - -// char salt[] = "salt"; -// GNUNET_CRYPTO_kdf (&t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey), -// salt, sizeof (salt), -// &t->e_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey), -// &my_full_id, sizeof (struct GNUNET_PeerIdentity), -// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity), -// NULL); -// GNUNET_CRYPTO_kdf (&t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey), -// salt, sizeof (salt), -// &t->d_key, sizeof (struct GNUNET_CRYPTO_AesSessionKey), -// GNUNET_PEER_resolve2 (t->peer->id), sizeof (struct GNUNET_PeerIdentity), -// &my_full_id, sizeof (struct GNUNET_PeerIdentity), -// NULL); - - return t; -} - - -/** - * Add a connection to a tunnel. - * - * @param t Tunnel. - * @param c Connection. - */ -static void -tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c) -{ - c->t = t; - GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c); -} - - -/** - * Initialize a Flow Control structure to the initial state. - * - * @param fc Flow Control structure to initialize. - */ -static void -fc_init (struct MeshFlowControl *fc) -{ - fc->next_pid = 0; - fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */ - fc->last_pid_recv = (uint32_t) -1; - fc->last_ack_sent = (uint32_t) 0; - fc->last_ack_recv = (uint32_t) 0; - fc->poll_task = GNUNET_SCHEDULER_NO_TASK; - fc->poll_time = GNUNET_TIME_UNIT_SECONDS; - fc->queue_n = 0; - fc->queue_max = (max_msgs_queue / max_connections) + 1; -} - - -static struct MeshConnection * -connection_new (const struct GNUNET_HashCode *cid) -{ - struct MeshConnection *c; - - c = GNUNET_new (struct MeshConnection); - c->id = *cid; - GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); - fc_init (&c->fwd_fc); - fc_init (&c->bck_fc); - c->fwd_fc.c = c; - c->bck_fc.c = c; - - return c; -} - - -/** - * Find a connection. - * - * @param cid Connection ID. - */ -static struct MeshConnection * -connection_get (const struct GNUNET_HashCode *cid) -{ - return GNUNET_CONTAINER_multihashmap_get (connections, cid); -} - - -static void -connection_destroy (struct MeshConnection *c) -{ - struct MeshPeer *peer; - - if (NULL == c) - return; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n", - peer2s (c->t->peer), - c->id); - - /* Cancel all traffic */ - connection_cancel_queues (c, GNUNET_YES); - connection_cancel_queues (c, GNUNET_NO); - - /* Cancel maintainance task (keepalive/timeout) */ - if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task) - GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task); - if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task) - GNUNET_SCHEDULER_cancel (c->bck_maintenance_task); - - /* Deregister from neighbors */ - peer = connection_get_next_hop (c); - if (NULL != peer) - GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c); - peer = connection_get_prev_hop (c); - if (NULL != peer) - GNUNET_CONTAINER_multihashmap_remove (peer->connections, &c->id, c); - - /* Delete */ - GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO); - GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c); - GNUNET_free (c); -} - - -static void -tunnel_destroy (struct MeshTunnel2 *t) -{ - struct MeshConnection *c; - struct MeshConnection *next; - - if (NULL == t) - return; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", - peer2s (t->peer)); - -// if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t)) -// GNUNET_break (0); - - for (c = t->connection_head; NULL != c; c = next) - { - next = c->next; - connection_destroy (c); - } - - GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO); - - GNUNET_free (t); -} - - -/** - * Tunnel is empty: destroy it. - * - * Notifies all connections about the destruction. - * - * @param t Tunnel to destroy. - */ -static void -tunnel_destroy_empty (struct MeshTunnel2 *t) -{ - struct MeshConnection *c; - - for (c = t->connection_head; NULL != c; c = c->next) - { - if (GNUNET_NO == c->destroy) - connection_send_destroy (c); - } - - if (0 == t->pending_messages) - tunnel_destroy (t); - else - t->destroy = GNUNET_YES; -} - - -/** - * Destroy tunnel if empty (no more channels). - * - * @param t Tunnel to destroy if empty. - */ -static void -tunnel_destroy_if_empty (struct MeshTunnel2 *t) -{ - if (NULL != t->channel_head) - return; - - tunnel_destroy_empty (t); -} - - -/** - * Destroy a channel and free all resources. - * - * @param ch Channel to destroy. - */ -static void -channel_destroy (struct MeshChannel *ch) -{ - struct MeshClient *c; - - if (NULL == ch) - return; - - c = ch->root; - if (NULL != c) - { - if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels, - ch->lid_root, ch)) - { - GNUNET_break (0); - } - } - - c = ch->dest; - if (NULL != c) - { - if (GNUNET_YES != - GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels, - ch->lid_dest, ch)) - { - GNUNET_break (0); - } - } - - channel_rel_free_all (ch->fwd_rel); - channel_rel_free_all (ch->bck_rel); - - GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch); - GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO); - - GNUNET_free (ch); -} - -/** - * Create a new channel. - * - * @param t Tunnel this channel is in. - * @param owner Client that owns the channel, NULL for foreign channels. - * @param lid_root Local ID for root client. - * - * @return A new initialized channel. NULL on error. - */ -static struct MeshChannel * -channel_new (struct MeshTunnel2 *t, - struct MeshClient *owner, MESH_ChannelNumber lid_root) -{ - struct MeshChannel *ch; - - ch = GNUNET_new (struct MeshChannel); - ch->root = owner; - ch->lid_root = lid_root; - ch->t = t; - ch->blocked_fwd = GNUNET_YES; - ch->blocked_bck = GNUNET_YES; - - GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, ch); - - GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO); - - if (NULL != owner) - { - while (NULL != channel_get (t, t->next_chid)) - t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI; - ch->gid = t->next_chid; - t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI; - - if(GNUNET_OK != - GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, lid_root, ch, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) - { - GNUNET_break (0); - channel_destroy (ch); - GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR); - return NULL; - } - } - - return ch; -} - - -/** - * Set options in a channel, extracted from a bit flag field - * - * @param ch Channel to set options to. - * @param options Bit array in host byte order. - */ -static void -channel_set_options (struct MeshChannel *ch, uint32_t options) -{ - ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ? - GNUNET_YES : GNUNET_NO; - ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ? - GNUNET_YES : GNUNET_NO; -} - - -/** - * Iterator for deleting each channel whose client endpoint disconnected. - * - * @param cls Closure (client that has disconnected). - * @param key The local channel id (used to access the hashmap). - * @param value The value stored at the key (channel to destroy). - * - * @return GNUNET_OK, keep iterating. - */ -static int -channel_destroy_iterator (void *cls, - uint32_t key, - void *value) -{ - struct MeshChannel *ch = value; - struct MeshClient *c = cls; - struct MeshTunnel2 *t; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " Channel %X (%X / %X) destroy, due to client %u shutdown.\n", - ch->gid, ch->lid_root, ch->lid_dest, c->id); - - if (c == ch->dest) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id); - ch->dest = NULL; - } - if (c == ch->root) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id); - ch->root = NULL; - } - - t = ch->t; - channel_send_destroy (ch); - channel_destroy (ch); - tunnel_destroy_if_empty (t); - - return GNUNET_OK; -} - - -/** - * Remove client's ports from the global hashmap on disconnect. - * - * @param cls Closure (unused). - * @param key Port. - * @param value Client structure. - * - * @return GNUNET_OK, keep iterating. - */ -static int -client_release_ports (void *cls, - uint32_t key, - void *value) -{ - int res; - - res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value); - if (GNUNET_YES != res) - { - GNUNET_break (0); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Port %u by client %p was not registered.\n", - key, value); - } - return GNUNET_OK; -} - - -/** - * Timeout function due to lack of keepalive/traffic from the owner. - * Destroys connection if called. - * - * @param cls Closure (connection to destroy). - * @param tc TaskContext. - */ -static void -connection_fwd_timeout (void *cls, - const struct GNUNET_SCHEDULER_TaskContext *tc) -{ - struct MeshConnection *c = cls; - - c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK; - if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) - return; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Connection %s[%X] FWD timed out. Destroying.\n", - peer2s (c->t->peer), - c->id); - - if (connection_is_origin (c, GNUNET_YES)) /* If local, leave. */ - return; - - connection_destroy (c); -} - - -/** - * Timeout function due to lack of keepalive/traffic from the destination. - * Destroys connection if called. - * - * @param cls Closure (connection to destroy). - * @param tc TaskContext - */ -static void -connection_bck_timeout (void *cls, - const struct GNUNET_SCHEDULER_TaskContext *tc) -{ - struct MeshConnection *c = cls; - - c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK; - if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) - return; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Connection %s[%X] FWD timed out. Destroying.\n", - peer2s (c->t->peer), - c->id); - - if (connection_is_origin (c, GNUNET_NO)) /* If local, leave. */ - return; - - connection_destroy (c); -} - - -/** - * Resets the connection timeout task, some other message has done the - * task's job. - * - For the first peer on the direction this means to send - * a keepalive or a path confirmation message (either create or ACK). - * - For all other peers, this means to destroy the connection, - * due to lack of activity. - * Starts the tiemout if no timeout was running (connection just created). - * - * @param c Connection whose timeout to reset. - * @param fwd Is this forward? - * - * TODO use heap to improve efficiency of scheduler. - */ -static void -connection_reset_timeout (struct MeshConnection *c, int fwd) -{ - GNUNET_SCHEDULER_TaskIdentifier *ti; - GNUNET_SCHEDULER_Task f; - - ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task; - - if (GNUNET_SCHEDULER_NO_TASK != *ti) - GNUNET_SCHEDULER_cancel (*ti); - - if (connection_is_origin (c, fwd)) /* Endpoint */ - { - f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive; - *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c); - } - else /* Relay */ - { - struct GNUNET_TIME_Relative delay; - - delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4); - f = fwd ? &connection_fwd_timeout : &connection_bck_timeout; - *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c); - } -} - - -/** - * Iterator to notify all connections of a broken link. Mark connections - * to destroy after all traffic has been sent. - * - * @param cls Closure (peer disconnected). - * @param key Current key code (tid). - * @param value Value in the hash map (connection). - * - * @return GNUNET_YES if we should continue to iterate, - * GNUNET_NO if not. - */ -static int -connection_broken (void *cls, - const struct GNUNET_HashCode *key, - void *value) -{ - struct MeshPeer *peer = cls; - struct MeshConnection *c = value; - struct GNUNET_MESH_ConnectionBroken msg; - int fwd; - - fwd = peer == connection_get_prev_hop (c); - connection_cancel_queues (c, !fwd); - - msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken)); - msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN); - msg.cid = c->id; - msg.peer1 = my_full_id; - msg.peer2 = *GNUNET_PEER_resolve2 (peer->id); - send_prebuilt_message_connection (&msg.header, c, NULL, fwd); - c->destroy = GNUNET_YES; - - return GNUNET_YES; -} - -/******************************************************************************/ -/**************** MESH NETWORK HANDLER HELPERS ***********************/ -/******************************************************************************/ - -/** - * 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 MeshPeer *peer; - struct MeshFlowControl *fc; - int fwd; - - fwd = queue->fwd; - peer = queue->peer; - GNUNET_assert (NULL != queue->c); - fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc; - - if (GNUNET_YES == clear_cls) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " queue destroy type %s\n", - GNUNET_MESH_DEBUG_M2S (queue->type)); - switch (queue->type) - { - case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY: - case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY: - GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n"); - GNUNET_break (GNUNET_YES == queue->c->destroy); - /* fall through */ - case GNUNET_MESSAGE_TYPE_MESH_FWD: - case GNUNET_MESSAGE_TYPE_MESH_BCK: - case GNUNET_MESSAGE_TYPE_MESH_ACK: - case GNUNET_MESSAGE_TYPE_MESH_POLL: - case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK: - case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE: - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");; - GNUNET_free_non_null (queue->cls); - break; - - default: - GNUNET_break (0); - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n", - GNUNET_MESH_DEBUG_M2S (queue->type)); - } - - } - GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue); - - fc->queue_n--; - peer->queue_n--; - if (NULL != queue->c) - { - queue->c->pending_messages--; - if (NULL != queue->c->t) - { - queue->c->t->pending_messages--; - } - } - - GNUNET_free (queue); -} - - -static size_t -queue_send (void *cls, size_t size, void *buf) -{ - struct MeshPeer *peer = cls; - struct MeshFlowControl *fc; - struct MeshConnection *c; - struct GNUNET_MessageHeader *msg; - struct MeshPeerQueue *queue; - struct MeshTunnel2 *t; - const struct GNUNET_PeerIdentity *dst_id; - size_t data_size; - uint32_t pid; - uint16_t type; - int fwd; - - peer->core_transmit = NULL; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n"); - - if (NULL == buf || 0 == size) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n"); - return 0; - } - - /* Initialize */ - queue = peer_get_first_message (peer); - if (NULL == queue) - { - GNUNET_break (0); /* Core tmt_rdy should've been canceled */ - return 0; - } - c = queue->c; - fwd = queue->fwd; - fc = fwd ? &c->fwd_fc : &c->bck_fc; - - - dst_id = GNUNET_PEER_resolve2 (peer->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 = (NULL != c) ? c->t : NULL; - type = 0; - - /* Fill buf */ - switch (queue->type) - { - case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY: - case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN: - case GNUNET_MESSAGE_TYPE_MESH_FWD: - case GNUNET_MESSAGE_TYPE_MESH_BCK: - case GNUNET_MESSAGE_TYPE_MESH_ACK: - case GNUNET_MESSAGE_TYPE_MESH_POLL: - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "* raw: %s\n", - GNUNET_MESH_DEBUG_M2S (queue->type)); - 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_CONNECTION_CREATE: - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n"); - if (connection_is_origin (c, GNUNET_YES)) - data_size = send_core_connection_create (queue->c, size, buf); - else - data_size = send_core_data_raw (queue->cls, size, buf); - break; - case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK: - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n"); - if (connection_is_origin (c, GNUNET_NO)) - data_size = send_core_connection_ack (queue->c, size, buf); - else - data_size = send_core_data_raw (queue->cls, size, buf); - break; - case GNUNET_MESSAGE_TYPE_MESH_DATA: - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE: - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY: - /* This should be encapsulted */ - GNUNET_break (0); - 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; - } - - /* Send ACK if needed, after accounting for sent ID in fc->queue_n */ - switch (type) - { - case GNUNET_MESSAGE_TYPE_MESH_FWD: - case GNUNET_MESSAGE_TYPE_MESH_BCK: - pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid ); - fc->last_pid_sent = pid; - if (NULL != queue->ch) - channel_send_client_ack (queue->ch, fwd); - else - connection_send_ack (c, fwd); - break; - default: - break; - } - - /* Free queue, but cls was freed by send_core_* */ - queue_destroy (queue, GNUNET_NO); - - /* If more data in queue, send next */ - queue = peer_get_first_message (peer); - if (NULL != queue) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n"); - if (NULL == peer->core_transmit) { - peer->core_transmit = - GNUNET_CORE_notify_transmit_ready(core_handle, - 0, - 0, - GNUNET_TIME_UNIT_FOREVER_REL, - dst_id, - queue->size, - &queue_send, - peer); - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "* tmt rdy called somewhere else\n"); - } - if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task) - { - GNUNET_log (GNUNET_ERROR_TYPE_INFO, "* %s starting poll timeout\n"); - fc->poll_task = - GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc); - } - } - else - { - if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task) - { - GNUNET_SCHEDULER_cancel (fc->poll_task); - fc->poll_task = GNUNET_SCHEDULER_NO_TASK; - } - } - if (NULL != c) - { - c->pending_messages--; - if (GNUNET_YES == c->destroy && 0 == c->pending_messages) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n"); - connection_destroy (c); - } - } - - if (NULL != t) - { - t->pending_messages--; - if (GNUNET_YES == t->destroy && 0 == t->pending_messages) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n"); - tunnel_destroy (t); - } - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size); - return data_size; -} - - -static void -queue_add (void *cls, uint16_t type, size_t size, - struct MeshConnection *c, - struct MeshChannel *ch, - int fwd) -{ - struct MeshPeerQueue *queue; - struct MeshFlowControl *fc; - struct MeshPeer *peer; - int priority; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "queue add %s %s (%u) on c %p, ch %p\n", - fwd ? "FWD" : "BCK", GNUNET_MESH_DEBUG_M2S (type), size, c, ch); - GNUNET_assert (NULL != c); - - fc = fwd ? &c->fwd_fc : &c->bck_fc; - peer = fwd ? connection_get_next_hop (c) : connection_get_prev_hop (c); - - if (NULL == fc) - { - GNUNET_break (0); - return; - } - - priority = 0; - - if (GNUNET_MESSAGE_TYPE_MESH_POLL == type || - GNUNET_MESSAGE_TYPE_MESH_ACK == type) - priority = 100; - - if (NULL != ch && - ( (NULL != ch->root && GNUNET_MESSAGE_TYPE_MESH_FWD == type) || - (NULL != ch->dest && GNUNET_MESSAGE_TYPE_MESH_BCK == type) )) - priority = 50; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "fc %p\n", fc); - if (fc->queue_n >= fc->queue_max && 0 == priority) - { - GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)", - 1, GNUNET_NO); - GNUNET_break (0); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "queue full: %u/%u\n", - fc->queue_n, fc->queue_max); - return; /* Drop this message */ - } - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "pid %u\n", fc->last_pid_sent); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ack %u\n", fc->last_ack_recv); - if (GMC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv) && - GNUNET_SCHEDULER_NO_TASK == fc->poll_task) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "no buffer space (%u > %u): starting poll\n", - fc->last_pid_sent + 1, fc->last_ack_recv); - fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time, - &connection_poll, - fc); - } - queue = GNUNET_malloc (sizeof (struct MeshPeerQueue)); - queue->cls = cls; - queue->type = type; - queue->size = size; - queue->peer = peer; - queue->c = c; - queue->ch = ch; - queue->fwd = fwd; - if (100 <= priority) - GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue); - else - GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue); - - if (NULL == peer->core_transmit) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "calling core tmt rdy towards %s\n", - peer2s (peer)); - peer->core_transmit = - GNUNET_CORE_notify_transmit_ready (core_handle, - 0, - 0, - GNUNET_TIME_UNIT_FOREVER_REL, - GNUNET_PEER_resolve2 (peer->id), - size, - &queue_send, - peer); - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "core tmt rdy towards %s already called\n", - peer2s (peer)); - - } - c->pending_messages++; - c->t->pending_messages++; - fc->queue_n++; - peer->queue_n++; -} - - -/******************************************************************************/ -/******************** MESH NETWORK HANDLERS **************************/ -/******************************************************************************/ - - -/** - * Generic handler for mesh network payload traffic. - * - * @param t Tunnel on which we got this message. - * @param message Unencryted data message. - * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO; - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd) -{ - struct MeshChannelReliability *rel; - struct MeshChannel *ch; - struct MeshClient *c; - uint32_t mid; - uint32_t *mid_recv; - uint16_t type; - size_t size; - - /* Check size */ - size = ntohs (msg->header.size); - if (size < - sizeof (struct GNUNET_MESH_Data) + - sizeof (struct GNUNET_MessageHeader)) - { - GNUNET_break (0); - return GNUNET_OK; - } - type = ntohs (msg->header.type); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n", - GNUNET_MESH_DEBUG_M2S (type)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n", - GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type))); - - /* Check channel */ - ch = channel_get (t, ntohl (msg->chid)); - if (NULL == ch) - { - GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel unknown\n"); - return GNUNET_OK; - } - - /* Initialize FWD/BCK data */ - c = fwd ? ch->dest : ch->root; - rel = fwd ? ch->bck_rel : ch->fwd_rel; - mid_recv = fwd ? &ch->mid_recv_fwd : &ch->mid_recv_bck; - - if (NULL == c) - { - GNUNET_break (0); - return GNUNET_OK; - } - - tunnel_change_state (t, MESH_TUNNEL_READY); - - GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO); - - mid = ntohl (msg->mid); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid); - - if (GNUNET_NO == ch->reliable || - ( !GMC_is_pid_bigger (*mid_recv, mid) && - GMC_is_pid_bigger (*mid_recv + 64, mid) ) ) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid); - if (GNUNET_YES == ch->reliable) - { - /* Is this the exact next expected messasge? */ - if (mid == *mid_recv) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n"); - *mid_recv = *mid_recv + 1; - channel_send_client_data (ch, msg, fwd); - channel_send_client_buffered_data (ch, c, rel); - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n"); - channel_rel_add_buffered_data (msg, rel); - } - } - else /* Tunnel unreliable, send to clients directly */ - { - channel_send_client_data (ch, msg, fwd); - } - } - else - { - GNUNET_break_op (0); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " MID %u not expected (%u - %u), dropping!\n", - mid, *mid_recv, *mid_recv + 64); - } - - channel_send_data_ack (ch, fwd); - return GNUNET_OK; -} - -/** - * Handler for mesh network traffic end-to-end ACKs. - * - * @param t Tunnel on which we got this message. - * @param message Data message. - * @param fwd Is this a fwd ACK? (dest->orig) - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_data_ack (struct MeshTunnel2 *t, - const struct GNUNET_MESH_DataACK *msg, int fwd) -{ - struct MeshChannelReliability *rel; - struct MeshReliableMessage *copy; - struct MeshReliableMessage *next; - struct MeshChannel *ch; - uint32_t ack; - uint16_t type; - int work; - - type = ntohs (msg->header.type); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n", - GNUNET_MESH_DEBUG_M2S (type)); - ch = channel_get (t, ntohl (msg->chid)); - if (NULL == ch) - { - GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO); - return GNUNET_OK; - } - ack = ntohl (msg->mid); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n", - (GNUNET_YES == fwd) ? "FWD" : "BCK", ack); - - if (GNUNET_YES == fwd) - { - rel = ch->fwd_rel; - } - else - { - rel = ch->bck_rel; - } - if (NULL == rel) - { - return GNUNET_OK; - } - - for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next) - { - if (GMC_is_pid_bigger (copy->mid, ack)) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid); - channel_rel_free_sent (rel, msg); - break; - } - work = GNUNET_YES; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid); - next = copy->next; - rel_message_free (copy); - } - /* ACK client if needed */ -// channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type); - - /* If some message was free'd, update the retransmission delay*/ - 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; - - delay = GNUNET_TIME_relative_multiply (rel->retry_timer, - MESH_RETRANSMIT_MARGIN); - new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp, - delay); - delay = GNUNET_TIME_absolute_get_remaining (new_target); - rel->retry_task = - GNUNET_SCHEDULER_add_delayed (delay, - &channel_retransmit_message, - rel); - } - } - else - GNUNET_break (0); - } - return GNUNET_OK; -} - - -/** - * Core handler for connection creation. - * - * @param cls Closure (unused). - * @param peer Sender (neighbor). - * @param message Message. - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_mesh_connection_create (void *cls, - const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MessageHeader *message) -{ - struct GNUNET_MESH_ConnectionCreate *msg; - struct GNUNET_PeerIdentity *id; - struct GNUNET_HashCode *cid; - struct MeshPeerPath *path; - struct MeshPeer *dest_peer; - struct MeshPeer *orig_peer; - struct MeshConnection *c; - unsigned int own_pos; - uint16_t size; - uint16_t i; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n"); - - /* Check size */ - size = ntohs (message->size); - if (size < sizeof (struct GNUNET_MESH_ConnectionCreate)) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Calculate hops */ - size -= sizeof (struct GNUNET_MESH_ConnectionCreate); - if (size % sizeof (struct GNUNET_PeerIdentity)) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - size /= sizeof (struct GNUNET_PeerIdentity); - if (1 > size) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size); - - /* Get parameters */ - msg = (struct GNUNET_MESH_ConnectionCreate *) message; - cid = &msg->cid; - id = (struct GNUNET_PeerIdentity *) &msg[1]; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " connection %s (%s).\n", - GNUNET_h2s (cid), GNUNET_i2s (id)); - - /* Create connection */ - c = connection_get (cid); - if (NULL == c) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n"); - c = connection_new (cid); - if (NULL == c) - return GNUNET_OK; - } - connection_reset_timeout (c, GNUNET_YES); - tunnel_change_state (c->t, MESH_TUNNEL_WAITING); - - /* Remember peers */ - dest_peer = peer_get (&id[size - 1]); - orig_peer = peer_get (&id[0]); - - /* Create path */ - 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 (&id[i])); - path->peers[i] = GNUNET_PEER_intern (&id[i]); - if (path->peers[i] == myid) - own_pos = i; - } - 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); - connection_destroy (c); - return GNUNET_OK; - } - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos); - path_add_to_peers (path, GNUNET_NO); - c->path = path_duplicate (path); - c->own_pos = own_pos; - - /* Is it a connection to us? */ - if (own_pos == size - 1) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); - peer_add_path_to_origin (orig_peer, path, GNUNET_YES); - - if (NULL == orig_peer->tunnel) - orig_peer->tunnel = tunnel_new (); - tunnel_add_connection (orig_peer->tunnel, c); - - send_connection_ack (c, GNUNET_NO); - - /* Keep tunnel alive in direction dest->owner*/ - connection_reset_timeout (c, GNUNET_NO); - } - else - { - /* It's for somebody else! Retransmit. */ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n"); - peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO); - peer_add_path_to_origin (orig_peer, path, GNUNET_NO); - send_prebuilt_message_connection (message, c, NULL, GNUNET_YES); - } - 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_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MessageHeader *message) -{ - struct GNUNET_MESH_ConnectionACK *msg; - struct MeshPeerPath *p; - struct MeshConnection *c; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n"); - msg = (struct GNUNET_MESH_ConnectionACK *) message; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n", - GNUNET_h2s (&msg->cid)); - c = connection_get (&msg->cid); - if (NULL == c) - { - GNUNET_STATISTICS_update (stats, "# control on unknown connection", - 1, GNUNET_NO); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n"); - return GNUNET_OK; - } - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", - GNUNET_i2s (peer)); - - /* Add path to peers? */ - p = c->path; - if (NULL != p) - { - path_add_to_peers (p, GNUNET_YES); - } - else - { - GNUNET_break (0); - } - connection_change_state (c, MESH_CONNECTION_READY); - connection_reset_timeout (c, GNUNET_NO); - if (MESH_TUNNEL_READY != c->t->state) - tunnel_change_state (c->t, MESH_TUNNEL_READY); - tunnel_send_queued_data (c->t, GNUNET_YES); - - /* Message for us? */ - if (connection_is_terminal (c, GNUNET_NO)) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); - if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget) - { - GNUNET_DHT_get_stop (c->t->peer->dhtget); - c->t->peer->dhtget = NULL; - } - //connection_send_ack (c, GNUNET_NO); /* FIXME */ - return GNUNET_OK; - } - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); - send_prebuilt_message_connection (message, c, NULL, GNUNET_NO); - return GNUNET_OK; -} - - -/** - * Core handler for notifications of broken paths - * - * @param cls Closure (unused). - * @param peer Peer identity of sending neighbor. - * @param message Message. - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MessageHeader *message) -{ - struct GNUNET_MESH_ConnectionBroken *msg; - struct MeshConnection *c; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer)); - msg = (struct GNUNET_MESH_ConnectionBroken *) 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)); - c = connection_get (&msg->cid); - if (NULL == c) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1), - GNUNET_PEER_search (&msg->peer2)); - return GNUNET_OK; - -} - - -/** - * Core handler for tunnel destruction - * - * @param cls Closure (unused). - * @param peer Peer identity of sending neighbor. - * @param message Message. - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_mesh_connection_destroy (void *cls, - const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MessageHeader *message) -{ - struct GNUNET_MESH_ConnectionDestroy *msg; - struct MeshConnection *c; - GNUNET_PEER_Id id; - int fwd; - - msg = (struct GNUNET_MESH_ConnectionDestroy *) message; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Got a CONNECTION DESTROY message from %s\n", - GNUNET_i2s (peer)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " for connection %s\n", - GNUNET_h2s (&msg->cid)); - c = connection_get (&msg->cid); - if (NULL == c) - { - /* 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; - } - id = GNUNET_PEER_search (peer); - if (id == connection_get_prev_hop (c)->id) - fwd = GNUNET_YES; - else if (id == connection_get_next_hop (c)->id) - fwd = GNUNET_NO; - else - { - GNUNET_break_op (0); - return GNUNET_OK; - } - send_prebuilt_message_connection (message, c, NULL, fwd); - c->destroy = GNUNET_YES; - - return GNUNET_OK; -} - - -/** - * Handler for channel create messages. - * - * @param t Tunnel this channel is to be created in. - * @param msg Message. - * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO; - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_channel_create (struct MeshTunnel2 *t, - struct GNUNET_MESH_ChannelCreate *msg, - int fwd) -{ - MESH_ChannelNumber chid; - struct MeshChannel *ch; - struct MeshClient *c; - uint32_t port; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel Create\n"); - /* Check message size */ - if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate)) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Check if channel exists */ - chid = ntohl (msg->chid); - ch = channel_get (t, chid); - if (NULL != ch) - { - /* Probably a retransmission, safe to ignore */ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n"); - } - else - { - /* Create channel */ - ch = channel_new (t, NULL, 0); - channel_set_options (ch, ntohl (msg->opt)); - } - - /* Find a destination client */ - port = ntohl (msg->port); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port %u\n", port); - c = GNUNET_CONTAINER_multihashmap32_get (ports, port); - if (NULL == c) - { - /* TODO send reject */ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n"); - return GNUNET_OK; - } - - channel_add_client (ch, c); - if (GNUNET_YES == ch->reliable) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n"); - ch->bck_rel = GNUNET_malloc (sizeof (struct MeshChannelReliability)); - ch->bck_rel->ch = ch; - ch->bck_rel->expected_delay = MESH_RETRANSMIT_TIME; - } - - send_local_channel_create (ch); - channel_send_ack (ch, !fwd); - - return GNUNET_OK; -} - - -/** - * Handler for channel ack messages. - * - * @param t Tunnel this channel is to be created in. - * @param msg Message. - * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO; - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_channel_ack (struct MeshTunnel2 *t, - struct GNUNET_MESH_ChannelManage *msg, - int fwd) -{ - MESH_ChannelNumber chid; - struct MeshChannel *ch; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received Channel ACK\n"); - /* Check message size */ - if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage)) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Check if channel exists */ - chid = ntohl (msg->chid); - ch = channel_get (t, chid); - if (NULL == ch) - { - GNUNET_break_op (0); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " channel %u unknown!!\n", chid); - return GNUNET_OK; - } - - channel_confirm (ch, !fwd); - return GNUNET_OK; -} - - -/** - * Handler for channel destroy messages. - * - * @param t Tunnel this channel is to be destroyed of. - * @param msg Message. - * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO; - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_channel_destroy (struct MeshTunnel2 *t, - struct GNUNET_MESH_ChannelManage *msg, - int fwd) -{ - MESH_ChannelNumber chid; - struct MeshChannel *ch; - - /* Check message size */ - if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelManage)) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Check if channel exists */ - chid = ntohl (msg->chid); - ch = channel_get (t, chid); - if (NULL == ch) - { - /* Probably a retransmission, safe to ignore */ - return GNUNET_OK; - } - - send_local_channel_destroy (ch, fwd); - channel_destroy (ch); - - return GNUNET_OK; -} - - -/** - * Generic handler for mesh network encrypted traffic. - * - * @param peer Peer identity this notification is about. - * @param message Encrypted message. - * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO; - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MESH_Encrypted *msg, - int fwd) -{ - struct MeshConnection *c; - struct MeshTunnel2 *t; - struct MeshPeer *neighbor; - struct MeshFlowControl *fc; - uint32_t pid; - uint32_t ttl; - uint16_t type; - size_t size; - - /* Check size */ - size = ntohs (msg->header.size); - if (size < - sizeof (struct GNUNET_MESH_Encrypted) + - sizeof (struct GNUNET_MessageHeader)) - { - GNUNET_break (0); - return GNUNET_OK; - } - type = ntohs (msg->header.type); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n", - GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer)); - - /* Check connection */ - c = connection_get (&msg->cid); - if (NULL == c) - { - GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n"); - return GNUNET_OK; - } - t = c->t; - fc = fwd ? &c->fwd_fc : &c->bck_fc; - - /* Check if origin is as expected */ - neighbor = connection_get_hop (c, fwd); - if (peer_get (peer)->id != neighbor->id) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Check PID */ - pid = ntohl (msg->pid); - if (GMC_is_pid_bigger (pid, fc->last_ack_sent)) - { - GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "WARNING Received PID %u, (prev %u), ACK %u\n", - pid, fc->last_pid_recv, fc->last_ack_sent); - return GNUNET_OK; - } - if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv)) - { - GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - " Pid %u not expected (%u+), dropping!\n", - pid, fc->last_pid_recv + 1); - return GNUNET_OK; - } - if (MESH_CONNECTION_SENT == c->state) - connection_change_state (c, MESH_CONNECTION_READY); - connection_reset_timeout (c, fwd); - fc->last_pid_recv = pid; - - /* Is this message for us? */ - if (connection_is_terminal (c, fwd)) - { - size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted); - char cbuf[dsize]; - struct GNUNET_MessageHeader *msgh; - int r; - - /* TODO signature verification */ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us!\n"); - GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO); - - fc->last_pid_recv = pid; - tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd); - msgh = (struct GNUNET_MessageHeader *) cbuf; - switch (ntohs (msgh->type)) - { - case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK: - r = handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh, fwd); - break; - - case GNUNET_MESSAGE_TYPE_MESH_DATA: - r = handle_data (t, (struct GNUNET_MESH_Data *) msgh, fwd); - break; - - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE: - r = handle_channel_create (t, - (struct GNUNET_MESH_ChannelCreate *) msgh, - fwd); - break; - - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_ACK: - r = handle_channel_ack (t, - (struct GNUNET_MESH_ChannelManage *) msgh, - fwd); - break; - - case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY: - r = handle_channel_destroy (t, - (struct GNUNET_MESH_ChannelManage *) msgh, - fwd); - break; - - default: - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "end-to-end message not known (%u)\n", - ntohs (msgh->type)); - r = GNUNET_OK; - } - - connection_send_ack (c, fwd); - return r; - } - - /* Message not for us: forward to next hop */ - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); - 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"); - connection_send_ack (c, fwd); - return GNUNET_OK; - } - GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO); - - send_prebuilt_message_connection (&msg->header, c, NULL, fwd); - - return GNUNET_OK; -} - - -/** - * Core handler for mesh network traffic going orig->dest. - * - * @param cls Closure (unused). - * @param message Message received. - * @param peer Peer who sent the message. - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MessageHeader *message) -{ - return handle_mesh_encrypted (peer, - (struct GNUNET_MESH_Encrypted *)message, - GNUNET_YES); -} - -/** - * Core handler for mesh network traffic going dest->orig. - * - * @param cls Closure (unused). - * @param message Message received. - * @param peer Peer who sent the message. - * - * @return GNUNET_OK to keep the connection open, - * GNUNET_SYSERR to close it (signal serious error) - */ -static int -handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer, - const struct GNUNET_MessageHeader *message) -{ - return handle_mesh_encrypted (peer, - (struct GNUNET_MESH_Encrypted *)message, - GNUNET_NO); -} - - -/** - * 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 MeshConnection *c; - 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; - - c = connection_get (&msg->cid); - - if (NULL == c) - { - GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1, - GNUNET_NO); - return GNUNET_OK; - } - - ack = ntohl (msg->ack); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack); - - /* Is this a forward or backward ACK? */ - id = GNUNET_PEER_search (peer); - if (connection_get_next_hop (c)->id == id) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n"); - fc = &c->fwd_fc; - } - else if (connection_get_prev_hop (c)->id == id) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n"); - fc = &c->bck_fc; - } - else - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Cancel polling if the ACK is bigger than before. */ - 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; - connection_unlock_queue (c, fc == &c->fwd_fc); - - 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 MeshConnection *c; - struct MeshFlowControl *fc; - GNUNET_PEER_Id id; - uint32_t pid; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n", - GNUNET_i2s (peer)); - - msg = (struct GNUNET_MESH_Poll *) message; - - c = connection_get (&msg->cid); - - if (NULL == c) - { - GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1, - GNUNET_NO); - GNUNET_break_op (0); - return GNUNET_OK; - } - - /* Is this a forward or backward ACK? */ - id = GNUNET_PEER_search (peer); - if (connection_get_next_hop (c)->id == id) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n"); - fc = &c->fwd_fc; - } - else if (connection_get_prev_hop (c)->id == id) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n"); - fc = &c->bck_fc; - } - else - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - pid = ntohl (msg->pid); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", - pid, fc->last_pid_recv); - fc->last_pid_recv = pid; - connection_send_ack (c, fc == &c->fwd_fc); - - 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_ConnectionKeepAlive *msg; - struct MeshConnection *c; - struct MeshPeer *neighbor; - int fwd; - - msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n", - GNUNET_i2s (peer)); - - c = connection_get (&msg->cid); - if (NULL == c) - { - GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1, - GNUNET_NO); - return GNUNET_OK; - } - - fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ? - GNUNET_YES : GNUNET_NO; - - /* Check if origin is as expected */ - neighbor = connection_get_hop (c, fwd); - if (peer_get (peer)->id != neighbor->id) - { - GNUNET_break_op (0); - return GNUNET_OK; - } - - connection_change_state (c, MESH_CONNECTION_READY); - connection_reset_timeout (c, fwd); - - if (connection_is_terminal (c, fwd)) - return GNUNET_OK; - - GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO); - send_prebuilt_message_connection (message, c, NULL, fwd); - - return GNUNET_OK; -} - - - -/** - * Functions to handle messages from core - */ -static struct GNUNET_CORE_MessageHandler core_handlers[] = { - {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE, - 0}, - {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK, - sizeof (struct GNUNET_MESH_ConnectionACK)}, - {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN, - sizeof (struct GNUNET_MESH_ConnectionBroken)}, - {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY, - sizeof (struct GNUNET_MESH_ConnectionDestroy)}, - {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE, - sizeof (struct GNUNET_MESH_ConnectionKeepAlive)}, - {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE, - sizeof (struct GNUNET_MESH_ConnectionKeepAlive)}, - {&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_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0}, - {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0}, - {NULL, 0, 0} -}; - - -/** - * 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 MeshPeer *peer = cls; - struct MeshPeerPath *p; - struct MeshConnection *c; - 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); - - /* Count connections */ - for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++); - /* If we already have 3 (or more (?!)) connections, it's enough */ - if (3 <= i) - return; +#include "platform.h" +#include "gnunet_util_lib.h" +#include "mesh_enc.h" +#include "block_mesh.h" +#include "gnunet_statistics_service.h" - if (peer->tunnel->state == MESH_TUNNEL_SEARCHING) - { - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n"); - peer_connect (peer); - } - 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 **************************/ +/************************ DATA STRUCTURES ****************************/ /******************************************************************************/ -/** - * Handler for client connection. - * - * @param cls Closure (unused). - * @param client Client handler. - */ -static void -handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client) -{ - struct MeshClient *c; - - if (NULL == client) - return; - c = GNUNET_malloc (sizeof (struct MeshClient)); - c->handle = client; - c->id = next_client_id++; /* overflow not important: just for debug */ - GNUNET_SERVER_client_keep (client); - GNUNET_SERVER_client_set_user_context (client, c); - GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c); -} - - -/** - * 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; - - 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, %p)\n", - c->id, c); - GNUNET_SERVER_client_drop (c->handle); - c->shutting_down = GNUNET_YES; - if (NULL != c->own_channels) - { - GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels, - &channel_destroy_iterator, c); - GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels); - } - - if (NULL != c->incoming_channels) - { - GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels, - &channel_destroy_iterator, c); - GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels); - } - - if (NULL != c->ports) - { - GNUNET_CONTAINER_multihashmap32_iterate (c->ports, - &client_release_ports, c); - GNUNET_CONTAINER_multihashmap32_destroy (c->ports); - } - GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c); - GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c); - GNUNET_free (c); - } - 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); - - /* Initialize new client structure */ - c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size); - 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); - } - } - - c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32); - c->incoming_channels = 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_channel_create (void *cls, struct GNUNET_SERVER_Client *client, - const struct GNUNET_MessageHeader *message) -{ - struct GNUNET_MESH_ChannelMessage *msg; - struct MeshPeer *peer; - struct MeshTunnel2 *t; - struct MeshChannel *ch; - struct MeshClient *c; - MESH_ChannelNumber chid; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel 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_ChannelMessage) != ntohs (message->size)) - { - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - msg = (struct GNUNET_MESH_ChannelMessage *) message; - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n", - GNUNET_i2s (&msg->peer), ntohl (msg->port)); - chid = ntohl (msg->channel_id); - - /* Sanity check for duplicate channel IDs */ - if (NULL != channel_get_by_local_id (c, chid)) - { - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - peer = peer_get (&msg->peer); - if (NULL == peer->tunnel) - { - peer->tunnel = tunnel_new (); - peer->tunnel->peer = peer; - } - t = peer->tunnel; - - /* Create channel */ - ch = channel_new (t, c, chid); - if (NULL == ch) - { - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - ch->port = ntohl (msg->port); - channel_set_options (ch, ntohl (msg->opt)); - - /* In unreliable channels, we'll use the DLL to buffer data for the root */ - ch->fwd_rel = GNUNET_malloc (sizeof (struct MeshChannelReliability)); - ch->fwd_rel->ch = ch; - ch->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s[%x]:%u (%x)\n", - peer2s (t->peer), ch->gid, ch->port, ch->lid_root); - peer_connect (peer); - - /* Send create channel */ - { - struct GNUNET_MESH_ChannelCreate msgcc; - - msgcc.header.size = htons (sizeof (msgcc)); - msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE); - msgcc.chid = htonl (ch->gid); - msgcc.port = msg->port; - msgcc.opt = msg->opt; - - tunnel_queue_data (t, ch, &msgcc.header, GNUNET_YES); - } - - 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_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client, - const struct GNUNET_MessageHeader *message) -{ - struct GNUNET_MESH_ChannelMessage *msg; - struct MeshClient *c; - struct MeshChannel *ch; - struct MeshTunnel2 *t; - MESH_ChannelNumber chid; - - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Got a DESTROY CHANNEL 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_ChannelMessage) != ntohs (message->size)) - { - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - msg = (struct GNUNET_MESH_ChannelMessage *) message; - - /* Retrieve tunnel */ - chid = ntohl (msg->channel_id); - ch = channel_get_by_local_id (c, chid); - if (NULL == ch) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " channel %X not found\n", chid); - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - /* Cleanup after the tunnel */ - client_delete_channel (c, ch); - if (c == ch->dest && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= chid) - { - ch->dest = NULL; - } - else if (c == ch->root && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > chid) - { - ch->root = NULL; - } - else - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - " channel %X client %p (%p, %p)\n", - chid, c, ch->root, ch->dest); - GNUNET_break (0); - } - - t = ch->t; - channel_destroy (ch); - tunnel_destroy_if_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 *msg; - struct MeshClient *c; - struct MeshChannel *ch; - MESH_ChannelNumber chid; - size_t size; - int fwd; - - 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); - - 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; - } - - /* Channel exists? */ - chid = ntohl (msg->id); - fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV; - ch = channel_get_by_local_id (c, chid); - if (NULL == ch) - { - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - /* Is the client in the channel? */ - if ( !( (fwd && - ch->root && - ch->root->handle == client) - || - (!fwd && - ch->dest && - ch->dest->handle == client) ) ) - { - GNUNET_break (0); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - if (fwd) - ch->blocked_fwd = GNUNET_YES; - else - ch->blocked_bck = GNUNET_YES; - - /* Ok, everything is correct, send the message. */ - { - struct GNUNET_MESH_Data *payload; - uint16_t p2p_size = sizeof(struct GNUNET_MESH_Data) + size; - unsigned char cbuf[p2p_size]; - uint32_t *mid; - - mid = fwd ? &ch->mid_send_fwd : &ch->mid_send_bck; - payload = (struct GNUNET_MESH_Data *) cbuf; - payload->mid = htonl (*mid); - *mid = *mid + 1; - memcpy (&payload[1], &msg[1], size); - payload->header.size = htons (p2p_size); - payload->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA); - payload->chid = htonl (ch->gid); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n"); - send_prebuilt_message_channel (&payload->header, ch, fwd); - - if (GNUNET_YES == ch->reliable) - channel_save_copy (ch, &payload->header, fwd); - } - if (tunnel_get_buffer (ch->t, fwd) > 0) - send_local_ack (ch, c, fwd); - 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 MeshChannelReliability *rel; - struct MeshChannel *ch; - struct MeshClient *c; - MESH_ChannelNumber chid; - int fwd; - - 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; - - /* Channel exists? */ - chid = ntohl (msg->channel_id); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", chid); - ch = channel_get_by_local_id (c, chid); - if (NULL == ch) - { - GNUNET_break (0); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Channel %X unknown.\n", chid); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id); - GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); - return; - } - - fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV; - rel = fwd ? ch->fwd_rel : ch->bck_rel; - - rel->client_ready = GNUNET_YES; - channel_send_client_buffered_data (ch, c, rel); - channel_send_connection_ack (ch, 64 - rel->n_recv, fwd); - - 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 MeshChannel *ch = value; -// struct GNUNET_MESH_LocalMonitor *msg; -// -// msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor)); -// msg->channel_id = htonl (ch->gid); -// msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor)); -// msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS); -// -// GNUNET_log (GNUNET_ERROR_TYPE_INFO, -// "* sending info about tunnel %s\n", -// GNUNET_i2s (&msg->owner)); -// -// 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; +/******************************************************************************/ +/************************ DEBUG FUNCTIONS ****************************/ +/******************************************************************************/ - /* 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); -} +/******************************************************************************/ +/*********************** GLOBAL VARIABLES ****************************/ +/******************************************************************************/ +/****************************** Global variables ******************************/ /** - * Handler for client's MONITOR_TUNNEL request. - * - * @param cls Closure (unused). - * @param client Identification of the client. - * @param message The actual message. + * Handle to the statistics service. */ -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 MeshChannel *ch; - - /* 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->channel_id)); -// ch = channel_get (&msg->owner, ntohl (msg->channel_id)); - ch = NULL; // FIXME - if (NULL == ch) - { - /* We don't know the tunnel */ - 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; - 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); -} - +struct GNUNET_STATISTICS_Handle *stats; /** - * Functions to handle messages from clients + * Local peer own ID (memory efficient handle). */ -static struct GNUNET_SERVER_MessageHandler client_handlers[] = { - {&handle_local_new_client, NULL, - GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0}, - {&handle_local_channel_create, NULL, - GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE, - sizeof (struct GNUNET_MESH_ChannelMessage)}, - {&handle_local_channel_destroy, NULL, - GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY, - sizeof (struct GNUNET_MESH_ChannelMessage)}, - {&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} -}; - +GNUNET_PEER_Id myid; /** - * Method called whenever a given peer connects. - * - * @param cls closure - * @param peer peer identity this notification is about + * Local peer own ID (full value). */ -static void -core_connect (void *cls, const struct GNUNET_PeerIdentity *peer) -{ - struct MeshPeer *pi; - struct MeshPeerPath *path; - - DEBUG_CONN ("Peer connected\n"); - DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id)); - pi = peer_get (peer); - if (myid == pi->id) - { - DEBUG_CONN (" (self)\n"); - path = path_new (1); - } - else - { - DEBUG_CONN (" %s\n", GNUNET_i2s (peer)); - path = path_new (2); - path->peers[1] = pi->id; - GNUNET_PEER_change_rc (pi->id, 1); - GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO); - } - path->peers[0] = myid; - GNUNET_PEER_change_rc (myid, 1); - peer_add_path (pi, path, GNUNET_YES); - - pi->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES); - return; -} +struct GNUNET_PeerIdentity my_full_id; +/*************************** Static global variables **************************/ /** - * Method called whenever a peer disconnects. - * - * @param cls closure - * @param peer peer identity this notification is about + * Own private key. */ -static void -core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer) -{ - struct MeshPeer *pi; +static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key; - DEBUG_CONN ("Peer disconnected\n"); - pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); - if (NULL == pi) - { - GNUNET_break (0); - return; - } - peer_remove_path (pi, myid, pi->id); +/******************************************************************************/ +/*********************** DECLARATIONS **************************/ +/******************************************************************************/ - GNUNET_CONTAINER_multihashmap_iterate (pi->connections, - connection_broken, - pi); - GNUNET_CONTAINER_multihashmap_destroy (pi->connections); - pi->connections = NULL; - if (myid == pi->id) - { - DEBUG_CONN (" (self)\n"); - } - GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO); - return; -} +/******************************************************************************/ +/****************** GENERAL HELPER FUNCTIONS ************************/ +/******************************************************************************/ -/** - * Install server (service) handlers and start listening to clients. - */ -static void -server_init (void) -{ - GNUNET_SERVER_add_handlers (server_handle, client_handlers); - GNUNET_SERVER_connect_notify (server_handle, - &handle_local_client_connect, NULL); - 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); -} +/******************************************************************************/ +/**************** MESH NETWORK HANDLER HELPERS ***********************/ +/******************************************************************************/ -/** - * To be called on core init/fail. - * - * @param cls Closure (config) - * @param identity the public identity of this peer - */ -static void -core_init (void *cls, - 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"); - if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id))) - { - 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; -} +/******************************************************************************/ +/******************** MESH NETWORK HANDLERS **************************/ +/******************************************************************************/ /******************************************************************************/ /************************ 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 MeshPeer *p = value; - struct MeshTunnel2 *t = p->tunnel; - - if (NULL != t) - tunnel_destroy (t); - return GNUNET_YES; -} - /** * Task run during shutdown. @@ -6724,27 +135,12 @@ shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { 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 (peers, &shutdown_tunnel, 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; - } + GML_shutdown (); + GMD_shutdown (); + GMP_shutdown (); + GMC_shutdown (); + GMT_shutdown (); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n"); } @@ -6760,174 +156,32 @@ static void run (void *cls, struct GNUNET_SERVER_Handle *server, const struct GNUNET_CONFIGURATION_Handle *c) { - char *keyfile; - struct GNUNET_CRYPTO_EccPrivateKey *pk; + struct GNUNET_CRYPTO_EddsaPrivateKey *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_CONNECTION_TIME", - &refresh_connection_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_CONNECTIONS", - &max_connections)) - { - 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; - } - - connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES); - 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_log (GNUNET_ERROR_TYPE_INFO, "reading key\n"); + pk = GNUNET_CRYPTO_eddsa_key_create_from_configuration (c); 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_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, &my_full_id); /* DHT */ + GMT_init (c, &my_full_id, my_private_key); - 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; - } - announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n"); } @@ -6951,7 +205,5 @@ main (int argc, char *const *argv) ret = (GNUNET_OK == r) ? 0 : 1; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n"); - INTERVAL_SHOW; - return ret; }