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[GNUnet-SVN] r28267 - gnunet/src/mesh
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From: |
gnunet |
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Subject: |
[GNUnet-SVN] r28267 - gnunet/src/mesh |
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Date: |
Tue, 23 Jul 2013 15:20:34 +0200 |
Author: bartpolot
Date: 2013-07-23 15:20:34 +0200 (Tue, 23 Jul 2013)
New Revision: 28267
Added:
gnunet/src/mesh/gnunet-service-mesh-enc.c
Modified:
gnunet/src/mesh/Makefile.am
Log:
- add separate encryption enabled mesh to avoid breakage during developement
Modified: gnunet/src/mesh/Makefile.am
===================================================================
--- gnunet/src/mesh/Makefile.am 2013-07-23 13:05:20 UTC (rev 28266)
+++ gnunet/src/mesh/Makefile.am 2013-07-23 13:20:34 UTC (rev 28267)
@@ -21,7 +21,7 @@
AM_CLFAGS = -g
libexec_PROGRAMS = \
- gnunet-service-mesh $(EXP_LIBEXEC)
+ gnunet-service-mesh gnunet-service-mesh-enc $(EXP_LIBEXEC)
bin_PROGRAMS = \
gnunet-mesh
@@ -83,6 +83,28 @@
gnunet_service_mesh_LDFLAGS = -lrt
endif
+gnunet_service_mesh_enc_SOURCES = \
+ gnunet-service-mesh-enc.c \
+ mesh_path.c \
+ mesh_common.c
+gnunet_service_mesh_enc_CFLAGS = $(AM_CFLAGS)
+gnunet_service_mesh_enc_LDADD = \
+ $(top_builddir)/src/util/libgnunetutil.la \
+ $(top_builddir)/src/core/libgnunetcore.la \
+ $(top_builddir)/src/dht/libgnunetdht.la \
+ $(top_builddir)/src/statistics/libgnunetstatistics.la \
+ $(top_builddir)/src/block/libgnunetblock.la
+gnunet_service_mesh_enc_DEPENDENCIES = \
+ $(top_builddir)/src/util/libgnunetutil.la \
+ $(top_builddir)/src/core/libgnunetcore.la \
+ $(top_builddir)/src/dht/libgnunetdht.la \
+ $(top_builddir)/src/statistics/libgnunetstatistics.la \
+ $(top_builddir)/src/block/libgnunetblock.la
+if LINUX
+ gnunet_service_mesh_enc_LDFLAGS = -lrt
+endif
+
+
if HAVE_TESTING
noinst_LIBRARIES = libgnunetmeshtest.a $(noinst_LIB_EXP)
endif
Added: gnunet/src/mesh/gnunet-service-mesh-enc.c
===================================================================
--- gnunet/src/mesh/gnunet-service-mesh-enc.c (rev 0)
+++ gnunet/src/mesh/gnunet-service-mesh-enc.c 2013-07-23 13:20:34 UTC (rev
28267)
@@ -0,0 +1,6002 @@
+/*
+ This file is part of GNUnet.
+ (C) 2001-2013 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file mesh/gnunet-service-mesh-enc.c
+ * @brief GNUnet MESH service with encryption
+ * @author Bartlomiej Polot
+ *
+ * FIXME in progress:
+ * - when sending in-order buffered data, wait for client ACKs
+ *
+ * TODO:
+ * - relay corking down to core
+ * - set ttl relative to path length
+ * - add signatures
+ * - add encryption
+ * TODO END
+ */
+
+#include "platform.h"
+#include "gnunet_crypto_lib.h"
+#include "mesh.h"
+#include "mesh_protocol.h"
+#include "mesh_path.h"
+#include "block_mesh.h"
+#include "gnunet_dht_service.h"
+#include "gnunet_statistics_service.h"
+
+#define MESH_BLOOM_SIZE 128
+
+#define MESH_DEBUG_DHT GNUNET_NO
+#define MESH_DEBUG_CONNECTION GNUNET_NO
+#define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
+
+#define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
+ GNUNET_TIME_UNIT_MINUTES,\
+ 10)
+#define MESH_RETRANSMIT_TIME GNUNET_TIME_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 <time.h>
+double __sum;
+uint64_t __count;
+struct timespec __mesh_start;
+struct timespec __mesh_end;
+#define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
+#define INTERVAL_END \
+do {\
+ clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
+ double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
+ if (__diff < 0) __diff += 1000000000;\
+ __sum += __diff;\
+ __count++;\
+} while (0)
+#define INTERVAL_SHOW \
+if (0 < __count)\
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n",
__sum/__count)
+#else
+#define INTERVAL_START
+#define INTERVAL_END
+#define INTERVAL_SHOW
+#endif
+
+/******************************************************************************/
+/************************ DATA STRUCTURES
****************************/
+/******************************************************************************/
+
+/** FWD declaration */
+struct MeshPeer;
+struct MeshClient;
+
+
+/**
+ * Struct containing info about a queued transmission to this peer
+ */
+struct MeshPeerQueue
+{
+ /**
+ * DLL next
+ */
+ struct MeshPeerQueue *next;
+
+ /**
+ * DLL previous
+ */
+ struct MeshPeerQueue *prev;
+
+ /**
+ * Peer this transmission is directed to.
+ */
+ struct MeshPeer *peer;
+
+ /**
+ * Tunnel this message belongs to.
+ */
+ struct MeshTunnel *tunnel;
+
+ /**
+ * Pointer to info stucture used as cls.
+ */
+ void *cls;
+
+ /**
+ * Type of message
+ */
+ uint16_t type;
+
+ /**
+ * Size of the message
+ */
+ size_t size;
+};
+
+
+/**
+ * Data describing a tunnel to a peer.
+ */
+struct MeshPeerTunnel
+{
+ /**
+ * 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_EccPublicKeyBinaryEncoded* my_eph;
+
+ /**
+ * Remote peer's public key.
+ */
+ struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded* peers_eph;
+
+ /**
+ * Encryption ("our") key.
+ */
+ struct GNUNET_CRYPTO_AesSessionKey e_key;
+
+ /**
+ * Decryption ("their") key.
+ */
+ struct GNUNET_CRYPTO_AesSessionKey d_key;
+};
+
+
+/**
+ * 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;
+
+ /**
+ * Number of attempts to reconnect so far
+ */
+ int n_reconnect_attempts;
+
+ /**
+ * Paths to reach the peer, ordered by ascending hop count
+ */
+ struct MeshPeerPath *path_head;
+
+ /**
+ * Paths to reach the peer, ordered by ascending hop count
+ */
+ struct MeshPeerPath *path_tail;
+
+ /**
+ * Handle to stop the DHT search for a path to this peer
+ */
+ struct GNUNET_DHT_GetHandle *dhtget;
+
+ /**
+ * Array of tunnels this peer is the target of.
+ * Most probably a small amount, therefore not a hashmap.
+ * When the path to the peer changes, notify these tunnels to let them
+ * re-adjust their path trees.
+ */
+ struct MeshTunnel **tunnels;
+
+ /**
+ * Number of tunnels this peers participates in
+ */
+ unsigned int ntunnels;
+
+ /**
+ * Transmission queue to core DLL head
+ */
+ struct MeshPeerQueue *queue_head;
+
+ /**
+ * Transmission queue to core DLL tail
+ */
+ struct MeshPeerQueue *queue_tail;
+
+ /**
+ * How many messages are in the queue to this peer.
+ */
+ unsigned int queue_n;
+
+ /**
+ * Handle for queued transmissions
+ */
+ struct GNUNET_CORE_TransmitHandle *core_transmit;
+};
+
+
+/**
+ * Struct to encapsulate all the Flow Control information to a peer in the
+ * context of a tunnel: Same peer in different tunnels will have independent
+ * flow control structures, allowing to choke/free tunnels according to its
+ * own criteria.
+ */
+struct MeshFlowControl
+{
+ /**
+ * ID of the last packet sent towards the peer.
+ */
+ uint32_t last_pid_sent;
+
+ /**
+ * ID of the last packet received from the peer.
+ */
+ uint32_t last_pid_recv;
+
+ /**
+ * Last ACK sent to the peer (peer can't send more than this PID).
+ */
+ uint32_t last_ack_sent;
+
+ /**
+ * Last ACK sent towards the origin (for traffic towards leaf node).
+ */
+ uint32_t last_ack_recv;
+
+ /**
+ * How many payload messages are in the queue towards this peer.
+ */
+ uint32_t queue_n;
+
+ /**
+ * Task to poll the peer in case of a lost ACK causes stall.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier poll_task;
+
+ /**
+ * How frequently to poll for ACKs.
+ */
+ struct GNUNET_TIME_Relative poll_time;
+
+ /**
+ * On which tunnel to poll.
+ * Using an explicit poll_ctx would not help memory wise,
+ * since the allocated context would have to be stored in the
+ * fc struct in order to free it upon cancelling poll_task.
+ */
+ struct MeshTunnel *t;
+};
+
+
+/**
+ * Globally unique tunnel identification (owner + number)
+ * DO NOT USE OVER THE NETWORK
+ */
+struct MESH_TunnelID
+{
+ /**
+ * Node that owns the tunnel
+ */
+ GNUNET_PEER_Id oid;
+
+ /**
+ * Tunnel number to differentiate all the tunnels owned by the node oid
+ * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
+ */
+ MESH_TunnelNumber tid;
+};
+
+
+/**
+ * Data needed for reliable tunnel endpoint retransmission management.
+ */
+struct MeshTunnelReliability;
+
+
+/**
+ * Info needed to retry a message in case it gets lost.
+ */
+struct MeshReliableMessage
+{
+ /**
+ * Double linked list, FIFO style
+ */
+ struct MeshReliableMessage *next;
+ struct MeshReliableMessage *prev;
+
+ /**
+ * Tunnel Reliability queue this message is in.
+ */
+ struct MeshTunnelReliability *rel;
+
+ /**
+ * ID of the message (ACK needed to free)
+ */
+ uint32_t mid;
+
+ /**
+ * When was this message issued (to calculate ACK delay)
+ */
+ struct GNUNET_TIME_Absolute timestamp;
+
+ /* struct GNUNET_MESH_Data with payload */
+};
+
+
+struct MeshTunnelReliability
+{
+ /**
+ * Tunnel this is about.
+ */
+ struct MeshTunnel *t;
+
+ /**
+ * DLL of messages sent and not yet ACK'd.
+ */
+ struct MeshReliableMessage *head_sent;
+ struct MeshReliableMessage *tail_sent;
+
+ /**
+ * Messages pending
+ */
+ unsigned int n_sent;
+
+ /**
+ * Next MID to use.
+ */
+ uint32_t mid_sent;
+
+ /**
+ * DLL of messages received out of order.
+ */
+ struct MeshReliableMessage *head_recv;
+ struct MeshReliableMessage *tail_recv;
+
+ /**
+ * Next MID expected.
+ */
+ uint32_t mid_recv;
+
+ /**
+ * Task to resend/poll in case no ACK is received.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier retry_task;
+
+ /**
+ * Counter for exponential backoff.
+ */
+ struct GNUNET_TIME_Relative retry_timer;
+
+ /**
+ * How long does it usually take to get an ACK.
+ */
+ struct GNUNET_TIME_Relative expected_delay;
+};
+
+
+/**
+ * Struct containing all information regarding a tunnel
+ * For an intermediate node the improtant info used will be:
+ * - id Tunnel unique identification
+ * - paths[0] To know where to send it next
+ * - metainfo: ready, speeds, accounting
+ */
+struct MeshTunnel
+{
+ /**
+ * Tunnel ID
+ */
+ struct MESH_TunnelID id;
+
+ /**
+ * Port of the tunnel.
+ */
+ uint32_t port;
+
+ /**
+ * State of the tunnel.
+ */
+ enum MeshTunnelState state;
+
+ /**
+ * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
+ */
+ MESH_TunnelNumber local_tid;
+
+ /**
+ * Local tunnel number for local destination clients (incoming number)
+ * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
+ * number.
+ */
+ MESH_TunnelNumber local_tid_dest;
+
+ /**
+ * Is the tunnel bufferless (minimum latency)?
+ */
+ int nobuffer;
+
+ /**
+ * Is the tunnel reliable?
+ */
+ int reliable;
+
+ /**
+ * Force sending ACK? Flag to allow duplicate ACK on POLL.
+ */
+ int force_ack;
+
+ /**
+ * How many messages do we accept in the forward queue.
+ */
+ unsigned int queue_max;
+
+ /**
+ * Last time the tunnel was used
+ */
+ struct GNUNET_TIME_Absolute timestamp;
+
+ /**
+ * Destination of the tunnel.
+ */
+ GNUNET_PEER_Id dest;
+
+ /**
+ * Next hop in the tunnel. If 0, @c client must be set.
+ */
+ GNUNET_PEER_Id next_hop;
+
+ /**
+ * Previous hop in the tunnel. If 0, @c owner must be set.
+ */
+ GNUNET_PEER_Id prev_hop;
+
+ /**
+ * Flow control information about @c next_hop or @c client.
+ */
+ struct MeshFlowControl next_fc;
+
+ /**
+ * Flow control information about @c prev_hop or @c owner.
+ */
+ struct MeshFlowControl prev_fc;
+
+ /**
+ * Client owner of the tunnel, if any
+ */
+ struct MeshClient *owner;
+
+ /**
+ * Client destination of the tunnel, if any.
+ */
+ struct MeshClient *client;
+
+ /**
+ * Task to keep the used paths alive at the owner,
+ * time tunnel out on all the other peers.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier 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;
+
+ /**
+ * Path being used for the tunnel.
+ */
+ struct MeshPeerPath *path;
+
+ /**
+ * Flag to signal the destruction of the tunnel.
+ * If this is set GNUNET_YES the tunnel will be destroyed
+ * when the queue is empty.
+ */
+ int destroy;
+
+ /**
+ * Total messages pending for this tunnels, payload or not.
+ */
+ unsigned int pending_messages;
+
+ /**
+ * Reliability data.
+ * Only present (non-NULL) at the owner of a tunnel.
+ */
+ struct MeshTunnelReliability *fwd_rel;
+
+ /**
+ * Reliability data.
+ * Only present (non-NULL) at the destination of a tunnel.
+ */
+ struct MeshTunnelReliability *bck_rel;
+};
+
+
+/**
+ * Struct containing information about a client of the service
+ *
+ * TODO: add a list of 'waiting' ports
+ */
+struct MeshClient
+{
+ /**
+ * Linked list next
+ */
+ struct MeshClient *next;
+
+ /**
+ * Linked list prev
+ */
+ struct MeshClient *prev;
+
+ /**
+ * Tunnels that belong to this client, indexed by local id
+ */
+ struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels;
+
+ /**
+ * Tunnels this client has accepted, indexed by incoming local id
+ */
+ struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
+
+ /**
+ * Handle to communicate with the client
+ */
+ struct GNUNET_SERVER_Client *handle;
+
+ /**
+ * Ports that this client has declared interest in.
+ * Indexed by port, contains *Client.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap32 *ports;
+
+ /**
+ * Whether the client is active or shutting down (don't send confirmations
+ * to a client that is shutting down.
+ */
+ int shutting_down;
+
+ /**
+ * ID of the client, mainly for debug messages
+ */
+ unsigned int id;
+
+};
+
+
+/******************************************************************************/
+/************************ DEBUG FUNCTIONS
****************************/
+/******************************************************************************/
+
+#if MESH_DEBUG
+/**
+ * GNUNET_SCHEDULER_Task for printing a message after some operation is done
+ * @param cls string to print
+ * @param success GNUNET_OK if the PUT was transmitted,
+ * GNUNET_NO on timeout,
+ * GNUNET_SYSERR on disconnect from service
+ * after the PUT message was transmitted
+ * (so we don't know if it was received or not)
+ */
+
+#if 0
+static void
+mesh_debug (void *cls, int success)
+{
+ char *s = cls;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
+}
+#endif
+
+#endif
+
+/******************************************************************************/
+/*********************** GLOBAL VARIABLES
****************************/
+/******************************************************************************/
+
+/************************** Configuration parameters
**************************/
+
+/**
+ * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
+ */
+static struct GNUNET_TIME_Relative refresh_path_time;
+
+/**
+ * How often to PUT own ID in the DHT.
+ */
+static struct GNUNET_TIME_Relative id_announce_time;
+
+/**
+ * Maximum time allowed to connect to a peer found by string.
+ */
+static struct GNUNET_TIME_Relative connect_timeout;
+
+/**
+ * Default TTL for payload packets.
+ */
+static unsigned long long default_ttl;
+
+/**
+ * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
+ */
+static unsigned long long dht_replication_level;
+
+/**
+ * How many tunnels are we willing to maintain.
+ * Local tunnels are always allowed, even if there are more tunnels than max.
+ */
+static unsigned long long max_tunnels;
+
+/**
+ * How many messages *in total* are we willing to queue, divided by number of
+ * tunnels to get tunnel queue size.
+ */
+static unsigned long long max_msgs_queue;
+
+/**
+ * How many peers do we want to remember?
+ */
+static unsigned long long max_peers;
+
+/**
+ * Percentage of messages that will be dropped (for test purposes only).
+ */
+static unsigned long long drop_percent;
+
+/*************************** Static global variables
**************************/
+
+/**
+ * DLL with all the clients, head.
+ */
+static struct MeshClient *clients_head;
+
+/**
+ * DLL with all the clients, tail.
+ */
+static struct MeshClient *clients_tail;
+
+/**
+ * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
+
+/**
+ * Number of tunnels known.
+ */
+static unsigned long long n_tunnels;
+
+/**
+ * Tunnels incoming, indexed by MESH_TunnelNumber
+ * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
+ */
+static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
+
+/**
+ * Peers known, indexed by PeerIdentity (MeshPeer).
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *peers;
+
+/*
+ * Handle to communicate with transport
+ */
+// static struct GNUNET_TRANSPORT_Handle *transport_handle;
+
+/**
+ * Handle to communicate with core.
+ */
+static struct GNUNET_CORE_Handle *core_handle;
+
+/**
+ * Handle to use DHT.
+ */
+static struct GNUNET_DHT_Handle *dht_handle;
+
+/**
+ * Handle to server.
+ */
+static struct GNUNET_SERVER_Handle *server_handle;
+
+/**
+ * Handle to the statistics service.
+ */
+static struct GNUNET_STATISTICS_Handle *stats;
+
+/**
+ * Notification context, to send messages to local clients.
+ */
+static struct GNUNET_SERVER_NotificationContext *nc;
+
+/**
+ * Local peer own ID (memory efficient handle).
+ */
+static GNUNET_PEER_Id myid;
+
+/**
+ * Local peer own ID (full value).
+ */
+static struct GNUNET_PeerIdentity my_full_id;
+
+/**
+ * Own private key.
+ */
+static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
+
+/**
+ * Own public key.
+ */
+static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
+
+/**
+ * Tunnel ID for the next created tunnel (global tunnel number).
+ */
+static MESH_TunnelNumber next_tid;
+
+/**
+ * Tunnel ID for the next incoming tunnel (local tunnel number).
+ */
+static MESH_TunnelNumber next_local_tid;
+
+/**
+ * All ports clients of this peer have opened.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
+
+/**
+ * Task to periodically announce itself in the network.
+ */
+GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
+
+/**
+ * Next ID to assign to a client.
+ */
+unsigned int next_client_id;
+
+
+/******************************************************************************/
+/*********************** DECLARATIONS
**************************/
+/******************************************************************************/
+
+/**
+ * Function to process paths received for a new peer addition. The recorded
+ * paths form the initial tunnel, which can be optimized later.
+ * Called on each result obtained for the DHT search.
+ *
+ * @param cls closure
+ * @param exp when will this value expire
+ * @param key key of the result
+ * @param type type of the result
+ * @param size number of bytes in data
+ * @param data pointer to the result data
+ */
+static void
+dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
+ const struct GNUNET_HashCode * key,
+ const struct GNUNET_PeerIdentity *get_path,
+ unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
+ size_t size, const void *data);
+
+
+/**
+ * Retrieve the 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 peer_infos of all the peers in the path
+ *
+ * @param p Path to process.
+ * @param confirmed Whether we know if the path works or not.
+ */
+static void
+path_add_to_peers (struct MeshPeerPath *p, int confirmed);
+
+
+
+/**
+ * Search for a tunnel by global ID using full PeerIdentities.
+ *
+ * @param oid owner of the tunnel.
+ * @param tid global tunnel number.
+ *
+ * @return tunnel handler, NULL if doesn't exist.
+ */
+static struct MeshTunnel *
+tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
+
+
+/**
+ * Change the tunnel state.
+ *
+ * @param t Tunnel whose ttate to change.
+ * @param state New state.
+ */
+static void
+tunnel_change_state (struct MeshTunnel *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 MeshTunnel *t, GNUNET_PEER_Id p1,
+ GNUNET_PEER_Id p2);
+
+
+/**
+ * Send FWD keepalive packets for a tunnel.
+ *
+ * @param cls Closure (tunnel for which to send the keepalive).
+ * @param tc Notification context.
+ */
+static void
+tunnel_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext
*tc);
+
+/**
+ * Send BCK keepalive packets for a tunnel.
+ *
+ * @param cls Closure (tunnel for which to send the keepalive).
+ * @param tc Notification context.
+ */
+static void
+tunnel_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext
*tc);
+
+/**
+ * @brief Use the given path for the tunnel.
+ * Update the next and prev hops (and RCs).
+ * (Re)start the path refresh in case the tunnel is locally owned.
+ *
+ * @param t Tunnel to update.
+ * @param p Path to use.
+ */
+static void
+tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
+
+/**
+ * Tunnel is empty: destroy it.
+ *
+ * Notifies all participants (peers, cleints) about the destruction.
+ *
+ * @param t Tunnel to destroy.
+ */
+static void
+tunnel_destroy_empty (struct MeshTunnel *t);
+
+/**
+ * Destroy the tunnel.
+ *
+ * This function does not generate any warning traffic to clients or peers.
+ *
+ * Tasks:
+ * Remove the tunnel from peer_info's and clients' hashmaps.
+ * Cancel messages belonging to this tunnel queued to neighbors.
+ * Free any allocated resources linked to the tunnel.
+ *
+ * @param t the tunnel to destroy
+ *
+ * @return GNUNET_OK on success
+ */
+static int
+tunnel_destroy (struct MeshTunnel *t);
+
+/**
+ * @brief Queue and pass message to core when possible.
+ *
+ * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
+ * and accounts for it. In case the queue is full, the message is dropped and
+ * a break issued.
+ *
+ * Otherwise, message is treated as internal and allowed to go regardless of
+ * queue status.
+ *
+ * @param cls Closure (@c type dependant). It will be used by queue_send to
+ * build the message to be sent if not already prebuilt.
+ * @param type Type of the message, 0 for a raw message.
+ * @param size Size of the message.
+ * @param dst Neighbor to send message to.
+ * @param t Tunnel this message belongs to.
+ */
+static void
+queue_add (void *cls, uint16_t type, size_t size,
+ struct MeshPeer *dst, struct MeshTunnel *t);
+
+
+/**
+ * Free a transmission that was already queued with all resources
+ * associated to the request.
+ *
+ * @param queue Queue handler to cancel.
+ * @param clear_cls Is it necessary to free associated cls?
+ */
+static void
+queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
+
+
+/**
+ * @brief Get the next transmittable message from the queue.
+ *
+ * This will be the head, except in the case of being a data packet
+ * not allowed by the destination peer.
+ *
+ * @param peer Destination peer.
+ *
+ * @return The next viable MeshPeerQueue element to send to that peer.
+ * NULL when there are no transmittable messages.
+ */
+struct MeshPeerQueue *
+queue_get_next (const struct MeshPeer *peer);
+
+
+/**
+ * Core callback to write a queued packet to core buffer
+ *
+ * @param cls Closure (peer info).
+ * @param size Number of bytes available in buf.
+ * @param buf Where the to write the message.
+ *
+ * @return number of bytes written to buf
+ */
+static size_t
+queue_send (void *cls, size_t size, void *buf);
+
+
+/**
+ * Dummy function to separate declarations from definitions in function list.
+ */
+void
+__mesh_divider______________________________________________________________();
+
+
+static const char *
+GNUNET_MESH_DEBUG_S2S (enum MeshTunnelState s)
+{
+ static char buf[128];
+
+ switch (s)
+ {
+ /**
+ * Uninitialized status, should never appear in operation.
+ */
+ case MESH_TUNNEL_NEW: return "MESH_TUNNEL_NEW";
+
+ /**
+ * Path to the peer not known yet
+ */
+ case MESH_TUNNEL_SEARCHING: return "MESH_TUNNEL_SEARCHING";
+
+ /**
+ * Request sent, not yet answered.
+ */
+ case MESH_TUNNEL_WAITING: return "MESH_TUNNEL_WAITING";
+
+ /**
+ * Peer connected and ready to accept data
+ */
+ case MESH_TUNNEL_READY: return "MESH_TUNNEL_READY";
+
+ /**
+ * Peer connected previosly but not responding
+ */
+ case MESH_TUNNEL_RECONNECTING: return "MESH_TUNNEL_RECONNECTING";
+
+ default:
+ sprintf (buf, "%u (UNKNOWN STATE)", s);
+ return buf;
+ }
+}
+
+
+/******************************************************************************/
+/************************ PERIODIC FUNCTIONS
****************************/
+/******************************************************************************/
+
+/**
+ * Periodically announce self id in the DHT
+ *
+ * @param cls closure
+ * @param tc task context
+ */
+static void
+announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct PBlock block;
+
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ {
+ announce_id_task = GNUNET_SCHEDULER_NO_TASK;
+ return;
+ }
+ /* TODO
+ * - Set data expiration in function of X
+ * - Adapt X to churn
+ */
+ DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
+
+ block.id = my_full_id;
+ GNUNET_DHT_put (dht_handle, /* DHT handle */
+ &my_full_id.hashPubKey, /* Key to use */
+ dht_replication_level, /* Replication level */
+ GNUNET_DHT_RO_RECORD_ROUTE |
GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
+ GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
+ sizeof (block), /* Size of the data */
+ (const char *) &block, /* Data itself */
+ GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
+ GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
+ NULL, /* Continuation */
+ NULL); /* Continuation closure */
+ announce_id_task =
+ GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
+}
+
+
+/******************************************************************************/
+/****************** GENERAL HELPER FUNCTIONS
************************/
+/******************************************************************************/
+
+
+/**
+ * Check if client has registered with the service and has not disconnected
+ *
+ * @param client the client to check
+ *
+ * @return non-NULL if client exists in the global DLL
+ */
+static struct MeshClient *
+client_get (struct GNUNET_SERVER_Client *client)
+{
+ return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
+}
+
+
+/**
+ * Deletes a tunnel from a client (either owner or destination). To be used on
+ * tunnel destroy.
+ *
+ * @param c Client whose tunnel to delete.
+ * @param t Tunnel which should be deleted.
+ */
+static void
+client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
+{
+ int res;
+
+ if (c == t->owner)
+ {
+ res = GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
+ t->local_tid, t);
+ if (GNUNET_YES != res)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel owner KO\n");
+ }
+ if (c == t->client)
+ {
+ res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
+ t->local_tid_dest, t);
+ if (GNUNET_YES != res)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n");
+ }
+}
+
+
+/**
+ * Notify the appropriate client that a new incoming tunnel was created.
+ *
+ * @param t Tunnel that was created.
+ */
+static void
+send_local_tunnel_create (struct MeshTunnel *t)
+{
+ struct GNUNET_MESH_TunnelMessage msg;
+
+ if (NULL == t->client)
+ return;
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
+ msg.tunnel_id = htonl (t->local_tid_dest);
+ msg.port = htonl (t->port);
+ msg.opt = 0;
+ msg.opt |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
+ msg.opt |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
+ msg.opt = htonl (msg.opt);
+ GNUNET_PEER_resolve (t->id.oid, &msg.peer);
+ GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
+ &msg.header, GNUNET_NO);
+}
+
+
+/**
+ * Notify a client that the incoming tunnel is no longer valid.
+ *
+ * @param t Tunnel that is destroyed.
+ * @param fwd Forward notification (owner->dest)?
+ */
+static void
+send_local_tunnel_destroy (struct MeshTunnel *t, int fwd)
+{
+ struct GNUNET_MESH_TunnelMessage msg;
+ struct MeshClient *c;
+
+ c = fwd ? t->client : t->owner;
+ 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.tunnel_id = htonl (fwd ? t->local_tid_dest : t->local_tid);
+ 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 t Tunnel on which to send the ACK.
+ * @param c Client to whom send the ACK.
+ * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
+ */
+static void
+send_local_ack (struct MeshTunnel *t,
+ struct MeshClient *c,
+ int is_fwd)
+{
+ struct GNUNET_MESH_LocalAck msg;
+
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
+ msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
+ GNUNET_SERVER_notification_context_unicast (nc,
+ c->handle,
+ &msg.header,
+ GNUNET_NO);
+}
+
+
+
+/**
+ * Sends an already built message to a peer, properly registrating
+ * all used resources.
+ *
+ * @param message Message to send. Function makes a copy of it.
+ * @param peer Short ID of the neighbor whom to send the message.
+ * @param t Tunnel on which this message is transmitted.
+ */
+static void
+send_prebuilt_message (const struct GNUNET_MessageHeader *message,
+ GNUNET_PEER_Id peer,
+ struct MeshTunnel *t)
+{
+ struct GNUNET_PeerIdentity id;
+ struct MeshPeer *neighbor;
+ struct MeshPeerPath *p;
+ void *data;
+ size_t size;
+ uint16_t type;
+
+// GNUNET_TRANSPORT_try_connect(); FIXME use?
+
+ if (0 == peer)
+ return;
+
+ size = ntohs (message->size);
+ data = GNUNET_malloc (size);
+ memcpy (data, message, size);
+ type = ntohs(message->type);
+ if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
+ GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
+ {
+ struct GNUNET_MESH_Data *u;
+
+ u = (struct GNUNET_MESH_Data *) data;
+ u->ttl = htonl (ntohl (u->ttl) - 1);
+ }
+ GNUNET_PEER_resolve (peer, &id);
+ neighbor = peer_get (&id);
+ for (p = neighbor->path_head; NULL != p; p = p->next)
+ {
+ if (2 >= p->length)
+ {
+ break;
+ }
+ }
+ if (NULL == p)
+ {
+#if MESH_DEBUG
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " %s IS NOT DIRECTLY CONNECTED\n",
+ GNUNET_i2s(&id));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " PATHS TO %s:\n",
+ GNUNET_i2s(&id));
+ for (p = neighbor->path_head; NULL != p; p = p->next)
+ {
+ struct GNUNET_PeerIdentity debug_id;
+ unsigned int i;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " path with %u hops through:\n",
+ p->length);
+ for (i = 0; i < p->length; i++)
+ {
+ GNUNET_PEER_resolve(p->peers[i], &debug_id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " hop %u: %s\n",
+ i, GNUNET_i2s(&debug_id));
+ }
+ }
+#endif
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ " no direct connection to %s\n",
+ GNUNET_i2s (&id));
+ GNUNET_free (data);
+ return;
+ }
+ if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
+ type = 0;
+ queue_add (data,
+ type,
+ size,
+ neighbor,
+ t);
+}
+
+
+/**
+ * Sends a CREATE PATH message for a path to a peer, properly registrating
+ * all used resources.
+ *
+ * @param t Tunnel for which the path is created.
+ */
+static void
+send_path_create (struct MeshTunnel *t)
+{
+ struct MeshPeer *neighbor;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
+ neighbor = peer_get_short (t->next_hop);
+ queue_add (t,
+ GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
+ sizeof (struct GNUNET_MESH_CreateTunnel) +
+ (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
+ neighbor,
+ t);
+ tunnel_change_state (t, MESH_TUNNEL_WAITING);
+}
+
+
+/**
+ * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to
us.
+ *
+ * @param t Tunnel which to confirm.
+ */
+static void
+send_path_ack (struct MeshTunnel *t)
+{
+ struct MeshPeer *neighbor;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send path ack\n");
+ neighbor = peer_get_short (t->prev_hop);
+ queue_add (t,
+ GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
+ sizeof (struct GNUNET_MESH_PathACK),
+ neighbor,
+ t);
+ tunnel_change_state (t, MESH_TUNNEL_WAITING);
+}
+
+
+/**
+ * Build an ACK message and queue it to send to the given peer.
+ *
+ * @param t Tunnel on which to send the ACK.
+ * @param peer Peer to whom send the ACK.
+ * @param ack Value of the ACK.
+ */
+static void
+send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
+{
+ struct GNUNET_MESH_ACK msg;
+
+ GNUNET_PEER_resolve (t->id.oid, &msg.oid);
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
+ msg.pid = htonl (ack);
+ msg.tid = htonl (t->id.tid);
+
+ send_prebuilt_message (&msg.header, peer, t);
+}
+
+
+/**
+ * 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 path packet to a peer.
+ *
+ * @param cls closure
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+send_core_path_create (void *cls, size_t size, void *buf)
+{
+ struct MeshTunnel *t = cls;
+ struct GNUNET_MESH_CreateTunnel *msg;
+ struct GNUNET_PeerIdentity *peer_ptr;
+ struct MeshPeerPath *p = t->path;
+ size_t size_needed;
+ uint32_t opt;
+ int i;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
+ size_needed =
+ sizeof (struct GNUNET_MESH_CreateTunnel) +
+ p->length * sizeof (struct GNUNET_PeerIdentity);
+
+ if (size < size_needed || NULL == buf)
+ {
+ GNUNET_break (0);
+ return 0;
+ }
+ msg = (struct GNUNET_MESH_CreateTunnel *) buf;
+ msg->header.size = htons (size_needed);
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
+ msg->tid = ntohl (t->id.tid);
+
+ opt = 0;
+ if (GNUNET_YES == t->nobuffer)
+ opt |= GNUNET_MESH_OPTION_NOBUFFER;
+ if (GNUNET_YES == t->reliable)
+ opt |= GNUNET_MESH_OPTION_RELIABLE;
+ msg->opt = htonl (opt);
+ msg->port = htonl (t->port);
+
+ peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
+ for (i = 0; i < p->length; i++)
+ {
+ GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "CREATE PATH (%u bytes long) sent!\n", size_needed);
+ return size_needed;
+}
+
+
+/**
+ * Creates a path ack message in buf and frees all unused resources.
+ *
+ * @param cls closure (MeshTransmissionDescriptor)
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+send_core_path_ack (void *cls, size_t size, void *buf)
+{
+ struct MeshTunnel *t = cls;
+ struct GNUNET_MESH_PathACK *msg = buf;
+
+ GNUNET_assert (NULL != t);
+ if (sizeof (struct GNUNET_MESH_PathACK) > size)
+ {
+ GNUNET_break (0);
+ return 0;
+ }
+ t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
+ msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
+ GNUNET_PEER_resolve (t->id.oid, &msg->oid);
+ msg->tid = htonl (t->id.tid);
+ msg->peer_id = my_full_id;
+ msg->ack = htonl (t->prev_fc.last_ack_sent);
+
+ /* TODO add signature */
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
+ return sizeof (struct GNUNET_MESH_PathACK);
+}
+
+
+/**
+ * Iterator over all the peers to remove the oldest not-used entry.
+ *
+ * @param cls Closure (unsued).
+ * @param key ID of the peer.
+ * @param value Peer_Info of the peer.
+ *
+ * FIXME implement
+ */
+static int
+peer_timeout (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
+{
+ return GNUNET_YES;
+}
+
+
+/**
+ * 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 = (struct MeshPeer *) GNUNET_malloc (sizeof (struct MeshPeer));
+ if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
+ {
+ GNUNET_CONTAINER_multihashmap_iterate (peers,
+ &peer_timeout,
+ NULL);
+ }
+ 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));
+}
+
+
+/**
+ * Select which PID to POLL for, to compensate for lost messages.
+ *
+ * @param pi Peer we want to poll.
+ * @param t Tunnel about which we want to poll.
+ *
+ * @return PID to use, either last sent or first_in_queue - 1
+ */
+static uint32_t
+peer_get_first_payload_pid (struct MeshPeer *p, struct MeshTunnel *t)
+{
+ struct MeshPeerQueue *q;
+ uint16_t type;
+
+ type = p->id == t->next_hop ? GNUNET_MESSAGE_TYPE_MESH_UNICAST :
+ GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN;
+
+ for (q = p->queue_head; NULL != q; q = q->next)
+ {
+ if (q->type == type && q->tunnel == t)
+ {
+ struct GNUNET_MESH_Data *msg = q->cls;
+
+ /* Pretend that the last one sent was the previous to this */
+ return ntohl (msg->pid) - 1;
+ }
+ }
+
+ /* No data in queue, use last sent */
+ {
+ struct MeshFlowControl *fc;
+
+ fc = p->id == t->next_hop ? &t->next_fc : &t->prev_fc;
+ return fc->last_pid_sent;
+ }
+}
+
+
+/**
+ * Choose the best path towards a peer considering the tunnel properties.
+ *
+ * @param peer The destination peer.
+ * @param t The tunnel the path is for.
+ *
+ * @return Best current known path towards the peer, if any.
+ */
+static struct MeshPeerPath *
+peer_get_best_path (const struct MeshPeer *peer, const struct MeshTunnel *t)
+{
+ struct MeshPeerPath *best_p;
+ struct MeshPeerPath *p;
+ unsigned int best_cost;
+ unsigned int cost;
+
+ best_p = p = peer->path_head;
+ best_cost = cost = p->length;
+ while (NULL != p)
+ {
+ if ((cost = p->length) < best_cost)
+ {
+ best_cost = cost;
+ best_p = p;
+ }
+ p = p->next;
+ }
+ return best_p;
+}
+
+
+/**
+ * Try to establish a new connection to this peer in the given tunnel.
+ * If the peer doesn't have any path to it yet, try to get one.
+ * If the peer already has some path, send a CREATE PATH towards it.
+ *
+ * @param peer PeerInfo of the peer.
+ * @param t Tunnel for which to create the path, if possible.
+ */
+static void
+peer_connect (struct MeshPeer *peer, struct MeshTunnel *t)
+{
+ struct MeshPeerPath *p;
+
+ if (NULL != peer->path_head)
+ {
+ p = peer_get_best_path (peer, t);
+ tunnel_use_path (t, p);
+ send_path_create (t);
+ }
+ else if (NULL == peer->dhtget)
+ {
+ struct GNUNET_PeerIdentity id;
+
+ GNUNET_PEER_resolve (peer->id, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
+ peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
+ GNUNET_BLOCK_TYPE_MESH_PEER, /* type
*/
+ &id.hashPubKey, /* key to search
*/
+ dht_replication_level, /* replication
level */
+ GNUNET_DHT_RO_RECORD_ROUTE |
+ GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
+ NULL, /* xquery */
+ 0, /* xquery bits */
+ &dht_get_id_handler, peer);
+ 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");
+ }
+}
+
+
+/**
+ * @brief Re-initiate traffic to this peer if necessary.
+ *
+ * Check if there is traffic queued towards this peer
+ * and the core transmit handle is NULL (traffic was stalled).
+ * If so, call core tmt rdy.
+ *
+ * @param peer_id Short ID of peer to which initiate traffic.
+ */
+static void
+peer_unlock_queue (GNUNET_PEER_Id peer_id)
+{
+ struct MeshPeer *peer;
+ struct MeshPeerQueue *q;
+ size_t size;
+
+ peer = peer_get_short (peer_id);
+ if (NULL != peer->core_transmit)
+ return;
+
+ q = queue_get_next (peer);
+ if (NULL == q)
+ return;
+
+ 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 towards a neighbor that belong to a certain tunnel.
+ *
+ * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
+ * @param t Tunnel which to cancel.
+ */
+static void
+peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
+{
+ struct MeshPeer *peer;
+ struct MeshPeerQueue *q;
+ struct MeshPeerQueue *next;
+ struct MeshFlowControl *fc;
+
+ if (0 == neighbor)
+ return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
+ peer = peer_get_short (neighbor);
+ for (q = peer->queue_head; NULL != q; q = next)
+ {
+ next = q->next;
+ if (q->tunnel == t)
+ {
+ if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == q->type ||
+ GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == q->type)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "peer_cancel_queues %s\n",
+ GNUNET_MESH_DEBUG_M2S (q->type));
+ }
+ queue_destroy (q, GNUNET_YES);
+ }
+ }
+ if (NULL == peer->queue_head && NULL != peer->core_transmit)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
+ peer->core_transmit = NULL;
+ }
+ fc = neighbor == t->next_hop ? &t->next_fc : &t->prev_fc;
+ if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
+ {
+ GNUNET_SCHEDULER_cancel (fc->poll_task);
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+}
+
+
+/**
+ * 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;
+ unsigned int i;
+
+ 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;
+ }
+ for (i = 0; i < peer->ntunnels; i++)
+ tunnel_destroy_empty (peer->tunnels[i]);
+ GNUNET_array_grow (peer->tunnels, peer->ntunnels, 0);
+ GNUNET_free (peer);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Remove all paths that rely on a direct connection between p1 and p2
+ * from the peer itself and notify all tunnels about it.
+ *
+ * @param peer PeerInfo of affected peer.
+ * @param p1 GNUNET_PEER_Id of one peer.
+ * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
+ * no longer is.
+ *
+ * TODO: optimize (see below)
+ */
+static void
+peer_remove_path (struct 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;
+
+ for (i = 0; i < peer->ntunnels; i++)
+ {
+ d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
+ if (0 == d)
+ continue;
+
+ peer_d = peer_get_short (d);
+ next = peer_get_best_path (peer_d, peer->tunnels[i]);
+ tunnel_use_path (peer->tunnels[i], next);
+ peer_connect (peer_d, peer->tunnels[i]);
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
+}
+
+
+/**
+ * Add the path to the peer and update the path used to reach it in case this
+ * is the shortest.
+ *
+ * @param peer_info Destination peer to add the path to.
+ * @param path New path to add. Last peer must be the peer in arg 1.
+ * Path will be either used of freed if already known.
+ * @param trusted Do we trust that this path is real?
+ */
+void
+peer_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));
+ }
+ }
+#if MESH_DEBUG
+ {
+ struct GNUNET_PeerIdentity id;
+
+ GNUNET_PEER_resolve (peer_info->id, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
+ path->length, GNUNET_i2s (&id));
+ }
+#endif
+ l = path_get_length (path);
+ if (0 == l)
+ {
+ path_destroy (path);
+ return;
+ }
+
+ GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
+ for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
+ {
+ l2 = path_get_length (aux);
+ if (l2 > l)
+ {
+ GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
+ peer_info->path_tail, aux, path);
+ return;
+ }
+ else
+ {
+ if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
+ {
+ path_destroy (path);
+ return;
+ }
+ }
+ }
+ GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
+ path);
+ return;
+}
+
+
+/**
+ * Add the path to the origin peer and update the path used to reach it in case
+ * this is the shortest.
+ * The path is given in peer_info -> destination, therefore we turn the path
+ * upside down first.
+ *
+ * @param peer_info Peer to add the path to, being the origin of the path.
+ * @param path New path to add after being inversed.
+ * Path will be either used or freed.
+ * @param trusted Do we trust that this path is real?
+ */
+static void
+peer_add_path_to_origin (struct MeshPeer *peer_info,
+ struct MeshPeerPath *path, int trusted)
+{
+ path_invert (path);
+ peer_add_path (peer_info, path, trusted);
+}
+
+
+/**
+ * Add a tunnel to the list of tunnels a peer participates in.
+ * Update the tunnel's destination.
+ *
+ * @param p Peer to add to.
+ * @param t Tunnel to add.
+ */
+static void
+peer_add_tunnel (struct MeshPeer *p, struct MeshTunnel *t)
+{
+ if (0 != t->dest)
+ {
+ GNUNET_break (t->dest == p->id);
+ return;
+ }
+ t->dest = p->id;
+ GNUNET_PEER_change_rc (t->dest, 1);
+ GNUNET_array_append (p->tunnels, p->ntunnels, t);
+}
+
+
+/**
+ * Remove a tunnel from the list of tunnels a peer participates in.
+ * Free the tunnel's destination.
+ *
+ * @param p Peer to clean.
+ * @param t Tunnel to remove.
+ */
+static void
+peer_remove_tunnel (struct MeshPeer *p, struct MeshTunnel *t)
+{
+ unsigned int i;
+
+ if (t->dest == p->id)
+ {
+ GNUNET_PEER_change_rc (t->dest, -1);
+ t->dest = 0;
+ }
+ for (i = 0; i < p->ntunnels; i++)
+ {
+ if (p->tunnels[i] == t)
+ {
+ p->tunnels[i] = p->tunnels[p->ntunnels - 1];
+ GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
+ return;
+ }
+ }
+}
+
+
+/**
+ * Function called if the connection to the peer has been stalled for a while,
+ * possibly due to a missed ACK. Poll the peer about its ACK status.
+ *
+ * @param cls Closure (poll ctx).
+ * @param tc TaskContext.
+ */
+static void
+tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshFlowControl *fc = cls;
+ struct GNUNET_MESH_Poll msg;
+ struct MeshTunnel *t = fc->t;
+ GNUNET_PEER_Id peer;
+
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ {
+ return;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
+
+ GNUNET_PEER_resolve (t->id.oid, &msg.oid);
+
+ if (fc == &t->prev_fc)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n");
+ peer = t->prev_hop;
+ }
+ else if (fc == &t->next_fc)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n");
+ peer = t->next_hop;
+ }
+ else
+ {
+ GNUNET_break (0);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** peer: %s!\n",
+ GNUNET_i2s(GNUNET_PEER_resolve2 (peer)));
+ if (0 == peer)
+ {
+ if (GNUNET_YES == t->destroy)
+ tunnel_destroy (t);
+ else
+ GNUNET_break (0);
+
+ return;
+ }
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
+ msg.header.size = htons (sizeof (msg));
+ msg.tid = htonl (t->id.tid);
+ msg.pid = htonl (peer_get_first_payload_pid (peer_get_short (peer), t));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", ntohl (msg.pid));
+ send_prebuilt_message (&msg.header, peer, t);
+ fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
+ fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
+ &tunnel_poll, fc);
+}
+
+
+/**
+ * Build a PeerPath from the paths returned from the DHT, reversing the paths
+ * to obtain a local peer -> destination path and interning the peer ids.
+ *
+ * @return Newly allocated and created path
+ */
+static struct MeshPeerPath *
+path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
+ unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *put_path,
+ unsigned int put_path_length)
+{
+ struct MeshPeerPath *p;
+ GNUNET_PEER_Id id;
+ int i;
+
+ p = path_new (1);
+ p->peers[0] = myid;
+ GNUNET_PEER_change_rc (myid, 1);
+ i = get_path_length;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
+ for (i--; i >= 0; i--)
+ {
+ id = GNUNET_PEER_intern (&get_path[i]);
+ if (p->length > 0 && id == p->peers[p->length - 1])
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
+ GNUNET_PEER_change_rc (id, -1);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
+ GNUNET_i2s (&get_path[i]));
+ p->length++;
+ p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) *
p->length);
+ p->peers[p->length - 1] = id;
+ }
+ }
+ i = put_path_length;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
+ for (i--; i >= 0; i--)
+ {
+ id = GNUNET_PEER_intern (&put_path[i]);
+ if (id == myid)
+ {
+ /* PUT path went through us, so discard the path up until now and start
+ * from here to get a much shorter (and loop-free) path.
+ */
+ path_destroy (p);
+ p = path_new (0);
+ }
+ if (p->length > 0 && id == p->peers[p->length - 1])
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
+ GNUNET_PEER_change_rc (id, -1);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
+ GNUNET_i2s (&put_path[i]));
+ p->length++;
+ p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) *
p->length);
+ p->peers[p->length - 1] = id;
+ }
+ }
+#if MESH_DEBUG
+ if (get_path_length > 0)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
+ GNUNET_i2s (&get_path[0]));
+ if (put_path_length > 0)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
+ GNUNET_i2s (&put_path[0]));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
+ p->length);
+ for (i = 0; i < p->length; i++)
+ {
+ struct GNUNET_PeerIdentity peer_id;
+
+ GNUNET_PEER_resolve (p->peers[i], &peer_id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
+ GNUNET_i2s (&peer_id));
+ }
+#endif
+ return p;
+}
+
+
+/**
+ * Adds a path to the peer_infos of all the peers in the path
+ *
+ * @param p Path to process.
+ * @param confirmed Whether we know if the path works or not.
+ */
+static void
+path_add_to_peers (struct MeshPeerPath *p, int confirmed)
+{
+ unsigned int i;
+
+ /* TODO: invert and add */
+ for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
+ for (i++; i < p->length; i++)
+ {
+ struct 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 tunnel among the incoming tunnels
+ *
+ * @param tid the local id of the tunnel
+ *
+ * @return tunnel handler, NULL if doesn't exist
+ */
+static struct MeshTunnel *
+tunnel_get_incoming (MESH_TunnelNumber tid)
+{
+ GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
+ return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid);
+}
+
+
+/**
+ * Search for a tunnel among the tunnels for a client
+ *
+ * @param c the client whose tunnels to search in
+ * @param tid the local id of the tunnel
+ *
+ * @return tunnel handler, NULL if doesn't exist
+ */
+static struct MeshTunnel *
+tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
+{
+ if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
+ {
+ GNUNET_break_op (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TID %X not a local tid\n", tid);
+ return NULL;
+ }
+ if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
+ {
+ return tunnel_get_incoming (tid);
+ }
+ else
+ {
+ return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid);
+ }
+}
+
+
+/**
+ * Search for a tunnel by global ID using PEER_ID
+ *
+ * @param pi owner of the tunnel
+ * @param tid global tunnel number
+ *
+ * @return tunnel handler, NULL if doesn't exist
+ */
+static struct MeshTunnel *
+tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
+{
+ struct MESH_TunnelID id;
+ struct GNUNET_HashCode hash;
+
+ id.oid = pi;
+ id.tid = tid;
+
+ GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
+ return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
+}
+
+
+/**
+ * Search for a tunnel by global ID using full PeerIdentities
+ *
+ * @param oid owner of the tunnel
+ * @param tid global tunnel number
+ *
+ * @return tunnel handler, NULL if doesn't exist
+ */
+static struct MeshTunnel *
+tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
+{
+ return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
+}
+
+
+/**
+ * Change the tunnel state.
+ *
+ * @param t Tunnel whose ttate to change.
+ * @param state New state.
+ */
+static void
+tunnel_change_state (struct MeshTunnel *t, enum MeshTunnelState state)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel %s[%X] state was %s\n",
+ GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid,
+ GNUNET_MESH_DEBUG_S2S (t->state));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel %s[%X] state is now %s\n",
+ GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid,
+ GNUNET_MESH_DEBUG_S2S (state));
+ t->state = state;
+}
+
+
+
+/**
+ * Add a client to a tunnel, initializing all needed data structures.
+ *
+ * @param t Tunnel to which add the client.
+ * @param c Client which to add to the tunnel.
+ */
+static void
+tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
+{
+ if (NULL != t->client)
+ {
+ GNUNET_break(0);
+ return;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels,
+ t->local_tid_dest, t,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels,
+ t->local_tid_dest, t,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ t->client = c;
+}
+
+
+static void
+tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
+{
+ unsigned int own_pos;
+
+ for (own_pos = 0; own_pos < p->length; own_pos++)
+ {
+ if (p->peers[own_pos] == myid)
+ break;
+ }
+ if (own_pos > p->length - 1)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ if (own_pos < p->length - 1)
+ t->next_hop = p->peers[own_pos + 1];
+ else
+ t->next_hop = p->peers[own_pos];
+ GNUNET_PEER_change_rc (t->next_hop, 1);
+ if (0 < own_pos)
+ t->prev_hop = p->peers[own_pos - 1];
+ else
+ t->prev_hop = p->peers[0];
+ GNUNET_PEER_change_rc (t->prev_hop, 1);
+
+ if (NULL != t->path)
+ path_destroy (t->path);
+ t->path = path_duplicate (p);
+ if (0 == own_pos)
+ {
+ if (GNUNET_SCHEDULER_NO_TASK != t->fwd_maintenance_task)
+ GNUNET_SCHEDULER_cancel (t->fwd_maintenance_task);
+ t->fwd_maintenance_task =
+ GNUNET_SCHEDULER_add_delayed (refresh_path_time,
+ &tunnel_fwd_keepalive, t);
+ }
+}
+
+
+/**
+ * Notifies a tunnel that a connection has broken that affects at least
+ * some of its peers. Sends a notification towards the root of the tree.
+ * In case the peer is the owner of the tree, notifies the client that owns
+ * the tunnel and tries to reconnect.
+ *
+ * @param t Tunnel affected.
+ * @param p1 Peer that got disconnected from p2.
+ * @param p2 Peer that got disconnected from p1.
+ *
+ * @return Short ID of the peer disconnected (either p1 or p2).
+ * 0 if the tunnel remained unaffected.
+ */
+static GNUNET_PEER_Id
+tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
+ GNUNET_PEER_Id p2)
+{
+// if (myid != p1 && myid != p2) FIXME
+// {
+// return;
+// }
+//
+// if (tree_get_predecessor (t->tree) != 0)
+// {
+// /* We are the peer still connected, notify owner of the disconnection.
*/
+// struct GNUNET_MESH_PathBroken msg;
+// struct GNUNET_PeerIdentity neighbor;
+//
+// msg.header.size = htons (sizeof (msg));
+// msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
+// GNUNET_PEER_resolve (t->id.oid, &msg.oid);
+// msg.tid = htonl (t->id.tid);
+// msg.peer1 = my_full_id;
+// GNUNET_PEER_resolve (pid, &msg.peer2);
+// GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
+// send_prebuilt_message (&msg.header, &neighbor, t);
+// }
+ return 0;
+}
+
+
+/**
+ * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
+ *
+ * @param t Tunnel this is about.
+ * @param fwd Is for FWD traffic? (ACK dest->owner)
+ */
+static void
+tunnel_send_data_ack (struct MeshTunnel *t, int fwd)
+{
+ struct GNUNET_MESH_DataACK msg;
+ struct MeshTunnelReliability *rel;
+ struct MeshReliableMessage *copy;
+ GNUNET_PEER_Id hop;
+ uint64_t mask;
+ unsigned int delta;
+
+ rel = fwd ? t->bck_rel : t->fwd_rel;
+ hop = fwd ? t->prev_hop : t->next_hop;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "send_data_ack for %u\n",
+ rel->mid_recv - 1);
+
+ if (GNUNET_NO == t->reliable)
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ msg.header.type = htons (fwd ? GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK :
+ GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
+ msg.header.size = htons (sizeof (msg));
+ msg.tid = htonl (t->id.tid);
+ GNUNET_PEER_resolve (t->id.oid, &msg.oid);
+ msg.mid = htonl (rel->mid_recv - 1);
+ msg.futures = 0;
+ for (copy = rel->head_recv; NULL != copy; copy = copy->next)
+ {
+ delta = copy->mid - rel->mid_recv;
+ 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 (&msg.header, hop, t);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
+}
+
+
+/**
+ * Send an ACK informing the predecessor about the available buffer space.
+ * In case there is no predecessor, inform the owning client.
+ * If buffering is off, send only on behalf of children or self if endpoint.
+ * If buffering is on, send when sent to children and buffer space is free.
+ * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
+ * the ACK itself goes "back" (towards root).
+ *
+ * @param t Tunnel on which to send the ACK.
+ * @param type Type of message that triggered the ACK transmission.
+ * @param fwd Is this FWD ACK? (Going dest->owner)
+ */
+static void
+tunnel_send_ack (struct MeshTunnel *t, uint16_t type, int fwd)
+{
+ struct MeshTunnelReliability *rel;
+ struct MeshFlowControl *next_fc;
+ struct MeshFlowControl *prev_fc;
+ struct MeshClient *c;
+ struct MeshClient *o;
+ GNUNET_PEER_Id hop;
+ uint32_t delta_mid;
+ uint32_t ack;
+ int delta;
+
+ rel = fwd ? t->fwd_rel : t->bck_rel;
+ c = fwd ? t->client : t->owner;
+ o = fwd ? t->owner : t->client;
+ next_fc = fwd ? &t->next_fc : &t->prev_fc;
+ prev_fc = fwd ? &t->prev_fc : &t->next_fc;
+ hop = fwd ? t->prev_hop : t->next_hop;
+
+ switch (type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "ACK due to %s\n",
+ GNUNET_MESH_DEBUG_M2S (type));
+ if (GNUNET_YES == t->nobuffer && (GNUNET_NO == t->reliable || NULL == c))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
+ return;
+ }
+ if (GNUNET_YES == t->reliable && NULL != c)
+ tunnel_send_data_ack (t, fwd);
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
+ t->force_ack = GNUNET_YES;
+ break;
+ default:
+ GNUNET_break (0);
+ }
+
+ /* Check if we need to transmit the ACK */
+ if (NULL == o &&
+ prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3 &&
+ GNUNET_NO == t->force_ack)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\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 = t->queue_max - next_fc->queue_n;
+ if (NULL != o && GNUNET_YES == t->reliable && NULL != rel->head_sent)
+ delta_mid = rel->mid_sent - rel->head_sent->mid;
+ else
+ delta_mid = 0;
+ if (0 > delta || (GNUNET_YES == t->reliable &&
+ NULL != o &&
+ (10 < rel->n_sent || 64 <= delta_mid)))
+ delta = 0;
+ if (NULL != o && delta > 1)
+ delta = 1;
+ 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,
+ t->queue_max, next_fc->queue_n);
+ if (ack == prev_fc->last_ack_sent && GNUNET_NO == t->force_ack)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
+ return;
+ }
+
+ prev_fc->last_ack_sent = ack;
+ if (NULL != o)
+ send_local_ack (t, o, fwd);
+ else if (0 != hop)
+ send_ack (t, hop, ack);
+ else
+ GNUNET_break (GNUNET_YES == t->destroy);
+ t->force_ack = GNUNET_NO;
+}
+
+
+/**
+ * Modify the mesh message TID from global to local and send to client.
+ *
+ * @param t Tunnel on which to send the message.
+ * @param msg Message to modify and send.
+ * @param c Client to send to.
+ * @param tid Tunnel ID to use (c can be both owner and client).
+ */
+static void
+tunnel_send_client_to_tid (struct MeshTunnel *t,
+ const struct GNUNET_MESH_Data *msg,
+ struct MeshClient *c, MESH_TunnelNumber tid)
+{
+ struct GNUNET_MESH_LocalData *copy;
+ uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
+ char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
+
+ if (size < sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (NULL == c)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ copy = (struct GNUNET_MESH_LocalData *) cbuf;
+ memcpy (©[1], &msg[1], size);
+ copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
+ copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
+ copy->tid = htonl (tid);
+ GNUNET_SERVER_notification_context_unicast (nc, c->handle,
+ ©->header, GNUNET_NO);
+}
+
+/**
+ * Modify the unicast message TID from global to local and send to client.
+ *
+ * @param t Tunnel on which to send the message.
+ * @param msg Message to modify and send.
+ * @param fwd Forward?
+ */
+static void
+tunnel_send_client_data (struct MeshTunnel *t,
+ const struct GNUNET_MESH_Data *msg,
+ int fwd)
+{
+ if (fwd)
+ tunnel_send_client_to_tid (t, msg, t->client, t->local_tid_dest);
+ else
+ tunnel_send_client_to_tid (t, msg, t->owner, t->local_tid);
+}
+
+
+/**
+ * Send up to 64 buffered messages to the client for in order delivery.
+ *
+ * @param t Tunnel on which to empty the message buffer.
+ * @param c Client to send to.
+ * @param rel Reliability structure to corresponding peer.
+ * If rel == t->bck_rel, this is FWD data.
+ */
+static void
+tunnel_send_client_buffered_data (struct MeshTunnel *t, struct MeshClient *c,
+ struct MeshTunnelReliability *rel)
+{
+ ;
+ struct MeshReliableMessage *copy;
+ struct MeshReliableMessage *next;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
+ for (copy = rel->head_recv; NULL != copy; copy = next)
+ {
+ next = copy->next;
+ if (copy->mid == rel->mid_recv)
+ {
+ struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " have %u! now expecting %u\n",
+ copy->mid, rel->mid_recv + 1);
+ tunnel_send_client_data (t, msg, (rel == t->bck_rel));
+ rel->mid_recv++;
+ GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
+ GNUNET_free (copy);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " don't have %u, next is %u\n",
+ rel->mid_recv,
+ copy->mid);
+ return;
+ }
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
+}
+
+
+/**
+ * We have received a message out of order, buffer it until we receive
+ * the missing one and we can feed the rest to the client.
+ *
+ * @param t Tunnel to add to.
+ * @param msg Message to buffer.
+ * @param rel Reliability data to the corresponding direction.
+ */
+static void
+tunnel_add_buffered_data (struct MeshTunnel *t,
+ const struct GNUNET_MESH_Data *msg,
+ struct MeshTunnelReliability *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);
+
+ // 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
+tunnel_free_reliable_message (struct MeshReliableMessage *copy)
+{
+ struct MeshTunnelReliability *rel;
+ struct GNUNET_TIME_Relative time;
+
+ rel = copy->rel;
+ time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
+ rel->expected_delay.rel_value *= 7;
+ rel->expected_delay.rel_value += time.rel_value;
+ rel->expected_delay.rel_value /= 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 tunnel,
+ * during a tunnel destruction.
+ * Frees the reliability structure itself.
+ *
+ * @param rel Reliability data for a tunnel.
+ */
+static void
+tunnel_free_reliable_all (struct MeshTunnelReliability *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 t Tunnel whose sent buffer to clean.
+ * @param msg DataACK message with a bitfield of future ACK'd messages.
+ * @param rel Reliability data.
+ */
+static void
+tunnel_free_sent_reliable (struct MeshTunnel *t,
+ const struct GNUNET_MESH_DataACK *msg,
+ struct MeshTunnelReliability *rel)
+{
+ 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;
+ tunnel_free_reliable_message (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
+tunnel_retransmit_message (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshTunnelReliability *rel = cls;
+ struct MeshReliableMessage *copy;
+ struct MeshFlowControl *fc;
+ struct MeshPeerQueue *q;
+ struct MeshPeer *pi;
+ struct MeshTunnel *t;
+ struct GNUNET_MESH_Data *payload;
+ GNUNET_PEER_Id hop;
+
+ rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ t = rel->t;
+ copy = rel->head_sent;
+ if (NULL == copy)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ /* Search the message to be retransmitted in the outgoing queue */
+ payload = (struct GNUNET_MESH_Data *) ©[1];
+ hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
+ fc = rel == t->fwd_rel ? &t->prev_fc : &t->next_fc;
+ pi = peer_get_short (hop);
+ for (q = pi->queue_head; NULL != q; q = q->next)
+ {
+ if (ntohs (payload->header.type) == q->type)
+ {
+ struct GNUNET_MESH_Data *queued_data = q->cls;
+
+ if (queued_data->mid == payload->mid)
+ break;
+ }
+ }
+
+ /* Message not found in the queue */
+ if (NULL == q)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
+
+ fc->last_ack_sent++;
+ fc->last_pid_recv++;
+ payload->pid = htonl (fc->last_pid_recv);
+ send_prebuilt_message (&payload->header, hop, t);
+ GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! STILL 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,
+ &tunnel_retransmit_message,
+ cls);
+}
+
+
+/**
+ * Send keepalive packets for a tunnel.
+ *
+ * @param t Tunnel to keep alive..
+ * @param fwd Is this a FWD keepalive? (owner -> dest).
+ */
+static void
+tunnel_keepalive (struct MeshTunnel *t, int fwd)
+{
+ struct GNUNET_MESH_TunnelKeepAlive *msg;
+ size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
+ char cbuf[size];
+ GNUNET_PEER_Id hop;
+ uint16_t type;
+
+ type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
+ GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
+ hop = fwd ? t->next_hop : t->prev_hop;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "sending %s keepalive for tunnel %d\n",
+ fwd ? "FWD" : "BCK", t->id.tid);
+
+ msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
+ msg->header.size = htons (size);
+ msg->header.type = htons (type);
+ msg->oid = *(GNUNET_PEER_resolve2 (t->id.oid));
+ msg->tid = htonl (t->id.tid);
+ send_prebuilt_message (&msg->header, hop, t);
+}
+
+
+/**
+ * Send create (PATH_CREATE/PATH_ACK) packets for a tunnel.
+ *
+ * @param t Tunnel for which to send the message.
+ * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
+ */
+static void
+tunnel_recreate (struct MeshTunnel *t, int fwd)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "sending path recreate for tunnel %s[%X]\n",
+ GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
+ if (fwd)
+ send_path_create (t);
+ else
+ send_path_ack (t);
+}
+
+
+/**
+ * Generic tunnel timer management.
+ * Depending on the role of the peer in the tunnel will send the
+ * appropriate message (build or keepalive)
+ *
+ * @param t Tunnel to maintain.
+ * @param fwd Is FWD?
+ */
+static void
+tunnel_maintain (struct MeshTunnel *t, int fwd)
+{
+ switch (t->state)
+ {
+ case MESH_TUNNEL_NEW:
+ GNUNET_break (0);
+ case MESH_TUNNEL_SEARCHING:
+ /* TODO DHT GET with RO_BART */
+ break;
+ case MESH_TUNNEL_WAITING:
+ tunnel_recreate (t, fwd);
+ break;
+ case MESH_TUNNEL_READY:
+ tunnel_keepalive (t, fwd);
+ break;
+ default:
+ break;
+ }
+}
+
+
+static void
+tunnel_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshTunnel *t = cls;
+
+ t->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
+ NULL == t->owner)
+ return;
+
+ tunnel_maintain (t, GNUNET_YES);
+ t->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
+
&tunnel_fwd_keepalive,
+ t);
+}
+
+
+static void
+tunnel_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshTunnel *t = cls;
+
+ t->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
+ NULL == t->client)
+ return;
+
+ tunnel_keepalive (t, GNUNET_NO);
+ t->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
+
&tunnel_bck_keepalive,
+ t);
+}
+
+
+/**
+ * Send a message to all peers and clients in this tunnel that the tunnel
+ * is no longer valid. If some peer or client should not receive the message,
+ * should be zero'ed out before calling this function.
+ *
+ * @param t The tunnel whose peers and clients to notify.
+ */
+static void
+tunnel_send_destroy (struct MeshTunnel *t)
+{
+ struct GNUNET_MESH_TunnelDestroy msg;
+ struct GNUNET_PeerIdentity id;
+
+ msg.header.size = htons (sizeof (msg));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
+ GNUNET_PEER_resolve (t->id.oid, &msg.oid);
+ msg.tid = htonl (t->id.tid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " sending tunnel destroy for tunnel: %s [%X]\n",
+ GNUNET_i2s (&msg.oid), t->id.tid);
+
+ if (NULL == t->client && 0 != t->next_hop)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
+ GNUNET_PEER_resolve (t->next_hop, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " sending forward to %s\n",
+ GNUNET_i2s (&id));
+ send_prebuilt_message (&msg.header, t->next_hop, t);
+ }
+ if (NULL == t->owner && 0 != t->prev_hop)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
+ GNUNET_PEER_resolve (t->prev_hop, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " sending back to %s\n",
+ GNUNET_i2s (&id));
+ send_prebuilt_message (&msg.header, t->prev_hop, t);
+ }
+ if (NULL != t->owner)
+ {
+ send_local_tunnel_destroy (t, GNUNET_NO);
+ }
+ if (NULL != t->client)
+ {
+ send_local_tunnel_destroy (t, GNUNET_YES);
+ }
+}
+
+static int
+tunnel_destroy (struct MeshTunnel *t)
+{
+ struct MeshClient *c;
+ struct GNUNET_HashCode hash;
+ int r;
+
+ if (NULL == t)
+ return GNUNET_OK;
+
+ r = GNUNET_OK;
+ c = t->owner;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
+ GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
+ if (NULL != c)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+
+ GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
+ if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
+ {
+ GNUNET_break (0);
+ r = GNUNET_SYSERR;
+ }
+
+ if (NULL != c)
+ {
+ if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
+ t->local_tid, t))
+ {
+ GNUNET_break (0);
+ r = GNUNET_SYSERR;
+ }
+ }
+
+ c = t->client;
+ if (NULL != c)
+ {
+ if (GNUNET_YES !=
+ GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
+ t->local_tid_dest, t))
+ {
+ GNUNET_break (0);
+ r = GNUNET_SYSERR;
+ }
+ if (GNUNET_YES !=
+ GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
+ t->local_tid_dest, t))
+ {
+ GNUNET_break (0);
+ r = GNUNET_SYSERR;
+ }
+ }
+
+ if(GNUNET_YES == t->reliable)
+ {
+ tunnel_free_reliable_all (t->fwd_rel);
+ tunnel_free_reliable_all (t->bck_rel);
+ }
+ if (0 != t->prev_hop)
+ {
+ peer_cancel_queues (t->prev_hop, t);
+ GNUNET_PEER_change_rc (t->prev_hop, -1);
+ }
+ if (0 != t->next_hop)
+ {
+ peer_cancel_queues (t->next_hop, t);
+ GNUNET_PEER_change_rc (t->next_hop, -1);
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != t->next_fc.poll_task)
+ {
+ GNUNET_SCHEDULER_cancel (t->next_fc.poll_task);
+ t->next_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != t->prev_fc.poll_task)
+ {
+ GNUNET_SCHEDULER_cancel (t->prev_fc.poll_task);
+ t->prev_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (0 != t->dest) {
+ peer_remove_tunnel (peer_get_short (t->dest), t);
+ }
+
+ if (GNUNET_SCHEDULER_NO_TASK != t->fwd_maintenance_task)
+ GNUNET_SCHEDULER_cancel (t->fwd_maintenance_task);
+ if (GNUNET_SCHEDULER_NO_TASK != t->bck_maintenance_task)
+ GNUNET_SCHEDULER_cancel (t->bck_maintenance_task);
+
+ n_tunnels--;
+ GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
+ path_destroy (t->path);
+ GNUNET_free (t);
+ return r;
+}
+
+/**
+ * Tunnel is empty: destroy it.
+ *
+ * Notifies all participants (peers, cleints) about the destruction.
+ *
+ * @param t Tunnel to destroy.
+ */
+static void
+tunnel_destroy_empty (struct MeshTunnel *t)
+{
+ #if MESH_DEBUG
+ {
+ struct GNUNET_PeerIdentity id;
+
+ GNUNET_PEER_resolve (t->id.oid, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "executing destruction of empty tunnel %s [%X]\n",
+ GNUNET_i2s (&id), t->id.tid);
+ }
+ #endif
+
+ if (GNUNET_NO == t->destroy)
+ tunnel_send_destroy (t);
+ if (0 == t->pending_messages)
+ tunnel_destroy (t);
+ else
+ t->destroy = GNUNET_YES;
+}
+
+/**
+ * Initialize a Flow Control structure to the initial state.
+ *
+ * @param fc Flow Control structure to initialize.
+ */
+static void
+fc_init (struct MeshFlowControl *fc)
+{
+ fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
+ fc->last_pid_recv = (uint32_t) -1;
+ fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
+ fc->last_ack_recv = (uint32_t) -1;
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
+ fc->queue_n = 0;
+}
+
+/**
+ * Create a new tunnel
+ *
+ * @param owner Who is the owner of the tunnel (short ID).
+ * @param tid Tunnel Number of the tunnel.
+ * @param client Clients that owns the tunnel, NULL for foreign tunnels.
+ * @param local Tunnel Number for the tunnel, for the client point of view.
+ *
+ * @return A new initialized tunnel. NULL on error.
+ */
+static struct MeshTunnel *
+tunnel_new (GNUNET_PEER_Id owner,
+ MESH_TunnelNumber tid,
+ struct MeshClient *client,
+ MESH_TunnelNumber local)
+{
+ struct MeshTunnel *t;
+ struct GNUNET_HashCode hash;
+
+ if (n_tunnels >= max_tunnels && NULL == client)
+ return NULL;
+
+ t = GNUNET_malloc (sizeof (struct MeshTunnel));
+ t->id.oid = owner;
+ t->id.tid = tid;
+ t->queue_max = (max_msgs_queue / max_tunnels) + 1;
+ t->owner = client;
+ fc_init (&t->next_fc);
+ fc_init (&t->prev_fc);
+ t->next_fc.t = t;
+ t->prev_fc.t = t;
+ t->local_tid = local;
+ n_tunnels++;
+ GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
+
+ GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
+ if (GNUNET_OK !=
+ GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
+ {
+ GNUNET_break (0);
+ tunnel_destroy (t);
+ if (NULL != client)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
+ }
+ return NULL;
+ }
+
+ if (NULL != client)
+ {
+ if (GNUNET_OK !=
+ GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
+ t->local_tid, t,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
+ {
+ tunnel_destroy (t);
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
+ return NULL;
+ }
+ }
+
+ return t;
+}
+
+
+/**
+ * Set options in a tunnel, extracted from a bit flag field
+ *
+ * @param t Tunnel to set options to.
+ * @param options Bit array in host byte order.
+ */
+static void
+tunnel_set_options (struct MeshTunnel *t, uint32_t options)
+{
+ t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
+ GNUNET_YES : GNUNET_NO;
+ t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
+ GNUNET_YES : GNUNET_NO;
+}
+
+
+/**
+ * Iterator for deleting each tunnel whose client endpoint disconnected.
+ *
+ * @param cls Closure (client that has disconnected).
+ * @param key The local tunnel id (used to access the hashmap).
+ * @param value The value stored at the key (tunnel to destroy).
+ *
+ * @return GNUNET_OK, keep iterating.
+ */
+static int
+tunnel_destroy_iterator (void *cls,
+ uint32_t key,
+ void *value)
+{
+ struct MeshTunnel *t = value;
+ struct MeshClient *c = cls;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " Tunnel %X / %X destroy, due to client %u shutdown.\n",
+ t->local_tid, t->local_tid_dest, c->id);
+ client_delete_tunnel (c, t);
+ if (c == t->client)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n",
c->id);
+ t->client = NULL;
+ if (0 != t->next_hop) { /* destroy could come before a path is used */
+ GNUNET_PEER_change_rc (t->next_hop, -1);
+ t->next_hop = 0;
+ }
+ }
+ if (c == t->owner)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
+ t->owner = NULL;
+ if (0 != t->prev_hop) { /* destroy could come before a path is used */
+ GNUNET_PEER_change_rc (t->prev_hop, -1);
+ t->prev_hop = 0;
+ }
+ }
+
+ tunnel_destroy_empty (t);
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * remove client's ports from the global hashmap on diconnect.
+ *
+ * @param cls Closure (unused).
+ * @param key Port.
+ * @param value ThClient 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 tunnel if called.
+ *
+ * @param cls Closure (tunnel to destroy).
+ * @param tc TaskContext
+ */
+static void
+tunnel_fwd_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshTunnel *t = cls;
+
+ t->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel %s [%X] FWD timed out. Destroying.\n",
+ GNUNET_i2s(GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
+ if (NULL != t->client)
+ send_local_tunnel_destroy (t, GNUNET_YES);
+ tunnel_destroy (t); /* Do not notify other */
+}
+
+
+/**
+ * Timeout function due to lack of keepalive/traffic from the destination.
+ * Destroys tunnel if called.
+ *
+ * @param cls Closure (tunnel to destroy).
+ * @param tc TaskContext
+ */
+static void
+tunnel_bck_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct MeshTunnel *t = cls;
+
+ t->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel %s [%X] BCK timed out. Destroying.\n",
+ GNUNET_i2s(GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
+ if (NULL != t->owner)
+ send_local_tunnel_destroy (t, GNUNET_NO);
+ tunnel_destroy (t); /* Do not notify other */
+}
+
+
+/**
+ * Resets the tunnel 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 tunnel,
+ * due to lack of activity.
+ * Starts the tiemout if no timeout was running (tunnel just created).
+ *
+ * @param t Tunnel whose timeout to reset.
+ * @param fwd Is this forward?
+ *
+ * TODO use heap to improve efficiency of scheduler.
+ */
+static void
+tunnel_reset_timeout (struct MeshTunnel *t, int fwd)
+{
+ GNUNET_SCHEDULER_TaskIdentifier *ti;
+ GNUNET_SCHEDULER_Task f;
+ struct MeshClient *c;
+
+ ti = fwd ? &t->fwd_maintenance_task : &t->bck_maintenance_task;
+ c = fwd ? t->owner : t->client;
+
+ if (GNUNET_SCHEDULER_NO_TASK != *ti)
+ GNUNET_SCHEDULER_cancel (*ti);
+
+ if (NULL != c)
+ {
+ f = fwd ? &tunnel_fwd_keepalive : &tunnel_bck_keepalive;
+ *ti = GNUNET_SCHEDULER_add_delayed (refresh_path_time, f, t);
+ }
+ else
+ {
+ f = fwd ? &tunnel_fwd_timeout : &tunnel_bck_timeout;
+ *ti = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
+ (refresh_path_time, 4),
+ f, t);
+ }
+}
+
+
+/******************************************************************************/
+/**************** 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 MeshFlowControl *fc;
+
+ if (GNUNET_YES == clear_cls)
+ {
+ switch (queue->type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
+ GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
+ /* fall through */
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ case GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE:
+ case GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " prebuilt message\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " type %s\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
+ break;
+ default:
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ " type %s unknown!\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ }
+ GNUNET_free_non_null (queue->cls);
+ }
+ GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
+ queue->peer->queue_tail,
+ queue);
+
+ /* Delete from appropriate fc in the tunnel */
+ if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
+ GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
+ {
+ if (queue->peer->id == queue->tunnel->prev_hop)
+ fc = &queue->tunnel->prev_fc;
+ else if (queue->peer->id == queue->tunnel->next_hop)
+ fc = &queue->tunnel->next_fc;
+ else
+ {
+ GNUNET_break (0);
+ GNUNET_free (queue);
+ return;
+ }
+ fc->queue_n--;
+ }
+ GNUNET_free (queue);
+}
+
+
+/**
+ * @brief Get the next transmittable message from the queue.
+ *
+ * This will be the head, except in the case of being a data packet
+ * not allowed by the destination peer.
+ *
+ * @param peer Destination peer.
+ *
+ * @return The next viable MeshPeerQueue element to send to that peer.
+ * NULL when there are no transmittable messages.
+ */
+struct MeshPeerQueue *
+queue_get_next (const struct MeshPeer *peer)
+{
+ struct MeshPeerQueue *q;
+
+ struct GNUNET_MESH_Data *dmsg;
+ struct MeshTunnel* t;
+ uint32_t pid;
+ uint32_t ack;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
+ for (q = peer->queue_head; NULL != q; q = q->next)
+ {
+ t = q->tunnel;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* %s\n",
+ GNUNET_MESH_DEBUG_M2S (q->type));
+ dmsg = (struct GNUNET_MESH_Data *) q->cls;
+ pid = ntohl (dmsg->pid);
+ switch (q->type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
+ ack = t->next_fc.last_ack_recv;
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
+ ack = t->prev_fc.last_ack_recv;
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* OK!\n");
+ return q;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* ACK: %u, PID: %u, MID: %u\n",
+ ack, pid, ntohl (dmsg->mid));
+ if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* OK!\n");
+ return q;
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* NEXT!\n");
+ }
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* nothing found\n");
+ return NULL;
+}
+
+
+static size_t
+queue_send (void *cls, size_t size, void *buf)
+{
+ struct MeshPeer *peer = cls;
+ struct GNUNET_MessageHeader *msg;
+ struct MeshPeerQueue *queue;
+ struct MeshTunnel *t;
+ struct GNUNET_PeerIdentity dst_id;
+ struct MeshFlowControl *fc;
+ size_t data_size;
+ uint32_t pid;
+ uint16_t type;
+
+ peer->core_transmit = NULL;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
+
+ if (NULL == buf || 0 == size)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
+ return 0;
+ }
+ queue = queue_get_next (peer);
+
+ /* Queue has no internal mesh traffic nor sendable payload */
+ if (NULL == queue)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
+ if (NULL == peer->queue_head)
+ GNUNET_break (0); /* Core tmt_rdy should've been canceled */
+ return 0;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
+
+ GNUNET_PEER_resolve (peer->id, &dst_id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* towards %s\n",
+ GNUNET_i2s (&dst_id));
+ /* Check if buffer size is enough for the message */
+ if (queue->size > size)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* not enough room, reissue\n");
+ peer->core_transmit =
+ GNUNET_CORE_notify_transmit_ready (core_handle,
+ GNUNET_NO,
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &dst_id,
+ queue->size,
+ &queue_send,
+ peer);
+ return 0;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
+
+ t = queue->tunnel;
+ GNUNET_assert (0 < t->pending_messages);
+ t->pending_messages--;
+ type = 0;
+
+ /* Fill buf */
+ switch (queue->type)
+ {
+ case 0:
+ case GNUNET_MESSAGE_TYPE_MESH_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
+ case GNUNET_MESSAGE_TYPE_MESH_POLL:
+ case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
+ case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
+ case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
+ case GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE:
+ case GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "* raw: %s\n",
+ GNUNET_MESH_DEBUG_M2S (queue->type));
+ /* Fall through */
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
+ data_size = send_core_data_raw (queue->cls, size, buf);
+ msg = (struct GNUNET_MessageHeader *) buf;
+ type = ntohs (msg->type);
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
+ data_size = send_core_path_create (queue->cls, size, buf);
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
+ data_size = send_core_path_ack (queue->cls, size, buf);
+ break;
+ default:
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "* type unknown: %u\n",
+ queue->type);
+ data_size = 0;
+ }
+
+ if (0 < drop_percent &&
+ GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Dropping message of type %s\n",
+ GNUNET_MESH_DEBUG_M2S(queue->type));
+ data_size = 0;
+ }
+ /* Free queue, but cls was freed by send_core_* */
+ queue_destroy (queue, GNUNET_NO);
+
+ /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
+ pid = ((struct GNUNET_MESH_Data *) buf)->pid;
+ pid = ntohl (pid);
+ switch (type)
+ {
+ case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
+ t->next_fc.last_pid_sent = pid;
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST, GNUNET_YES);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "!!! FWD %u\n",
+ ntohl ( ((struct GNUNET_MESH_Data *) buf)->mid ) );
+ break;
+ case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
+ t->prev_fc.last_pid_sent = pid;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "!!! BCK %u\n",
+ ntohl ( ((struct GNUNET_MESH_Data *) buf)->mid ) );
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, GNUNET_NO);
+ break;
+ default:
+ break;
+ }
+
+ /* If more data in queue, send next */
+ queue = queue_get_next (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 (peer->id == t->next_hop)
+ fc = &t->next_fc;
+ else if (peer->id == t->prev_hop)
+ fc = &t->prev_fc;
+ else
+ {
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "id: %u, next: %u, prev: %u\n",
+ peer->id, t->next_hop, t->prev_hop);
+ return data_size;
+ }
+ if (NULL != peer->queue_head)
+ {
+ if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task && fc->queue_n > 0)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "* %s starting poll timeout\n",
+ GNUNET_i2s (&my_full_id));
+ fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
+ &tunnel_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 (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;
+}
+
+
+/**
+ * @brief Queue and pass message to core when possible.
+ *
+ * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
+ * accounts for it. In case the queue is full, the message is dropped and
+ * a break issued.
+ *
+ * Otherwise, message is treated as internal and allowed to go regardless of
+ * queue status.
+ *
+ * @param cls Closure (@c type dependant). It will be used by queue_send to
+ * build the message to be sent if not already prebuilt.
+ * @param type Type of the message, 0 for a raw message.
+ * @param size Size of the message.
+ * @param dst Neighbor to send message to.
+ * @param t Tunnel this message belongs to.
+ */
+static void
+queue_add (void *cls, uint16_t type, size_t size,
+ struct MeshPeer *dst, struct MeshTunnel *t)
+{
+ struct MeshPeerQueue *queue;
+ struct MeshFlowControl *fc;
+ int priority;
+
+ fc = NULL;
+ priority = GNUNET_NO;
+ if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
+ {
+ fc = &t->next_fc;
+ }
+ else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
+ {
+ fc = &t->prev_fc;
+ }
+ if (NULL != fc)
+ {
+ if (fc->queue_n >= t->queue_max)
+ {
+ /* If this isn't a retransmission, drop the message */
+ if (GNUNET_NO == t->reliable ||
+ (NULL == t->owner && GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) ||
+ (NULL == t->client && GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type))
+ {
+ 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, t->queue_max);
+ return; /* Drop this message */
+ }
+ priority = GNUNET_YES;
+ }
+ fc->queue_n++;
+ if (GMC_is_pid_bigger(fc->last_pid_sent + 1, fc->last_ack_recv) &&
+ GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
+ fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
+ &tunnel_poll,
+ fc);
+ }
+ queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
+ queue->cls = cls;
+ queue->type = type;
+ queue->size = size;
+ queue->peer = dst;
+ queue->tunnel = t;
+ if (GNUNET_YES == priority)
+ {
+ struct GNUNET_MESH_Data *d;
+ uint32_t prev;
+ uint32_t next;
+
+ GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
+ d = (struct GNUNET_MESH_Data *) queue->cls;
+ prev = d->pid;
+ for (queue = dst->queue_tail; NULL != queue; queue = queue->prev)
+ {
+ if (queue->type != type)
+ continue;
+ d = (struct GNUNET_MESH_Data *) queue->cls;
+ next = d->pid;
+ d->pid = prev;
+ prev = next;
+ }
+ }
+ else
+ GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
+
+ if (NULL == dst->core_transmit)
+ {
+ dst->core_transmit =
+ GNUNET_CORE_notify_transmit_ready (core_handle,
+ 0,
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_PEER_resolve2 (dst->id),
+ size,
+ &queue_send,
+ dst);
+ }
+ t->pending_messages++;
+}
+
+
+/******************************************************************************/
+/******************** MESH NETWORK HANDLERS
**************************/
+/******************************************************************************/
+
+
+/**
+ * Core handler for path creation
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ unsigned int own_pos;
+ uint16_t size;
+ uint16_t i;
+ MESH_TunnelNumber tid;
+ struct GNUNET_MESH_CreateTunnel *msg;
+ struct GNUNET_PeerIdentity *pi;
+ struct MeshPeerPath *path;
+ struct MeshPeer *dest_peer_info;
+ struct MeshPeer *orig_peer_info;
+ struct MeshTunnel *t;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received a path create msg [%s]\n",
+ GNUNET_i2s (&my_full_id));
+ size = ntohs (message->size);
+ if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ size -= sizeof (struct GNUNET_MESH_CreateTunnel);
+ if (size % sizeof (struct GNUNET_PeerIdentity))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ size /= sizeof (struct GNUNET_PeerIdentity);
+ if (size < 1)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
+ msg = (struct GNUNET_MESH_CreateTunnel *) message;
+
+ tid = ntohl (msg->tid);
+ pi = (struct GNUNET_PeerIdentity *) &msg[1];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " path is for tunnel %s[%X]:%u.\n",
+ GNUNET_i2s (pi), tid, ntohl (msg->port));
+ t = tunnel_get (pi, tid);
+ if (NULL == t) /* might be a local tunnel */
+ {
+ uint32_t opt;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
+ t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
+ if (NULL == t)
+ {
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+ t->port = ntohl (msg->port);
+ opt = ntohl (msg->opt);
+ if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
+ {
+ t->nobuffer = GNUNET_YES;
+ t->queue_max = 1;
+ }
+ if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
+ {
+ t->reliable = GNUNET_YES;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
+ }
+ tunnel_reset_timeout (t, GNUNET_YES);
+ tunnel_change_state (t, MESH_TUNNEL_WAITING);
+ dest_peer_info =
+ GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
+ if (NULL == dest_peer_info)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " Creating PeerInfo for destination.\n");
+ dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeer));
+ dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
+ GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
+ dest_peer_info,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ }
+ orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
+ if (NULL == orig_peer_info)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " Creating PeerInfo for origin.\n");
+ orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeer));
+ orig_peer_info->id = GNUNET_PEER_intern (pi);
+ GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
+ path = path_new (size);
+ own_pos = 0;
+ for (i = 0; i < size; i++)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
+ GNUNET_i2s (&pi[i]));
+ path->peers[i] = GNUNET_PEER_intern (&pi[i]);
+ if (path->peers[i] == myid)
+ own_pos = i;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
+ if (own_pos == 0 && path->peers[own_pos] != myid)
+ {
+ /* create path: self not found in path through self */
+ GNUNET_break_op (0);
+ path_destroy (path);
+ tunnel_destroy (t);
+ return GNUNET_OK;
+ }
+ path_add_to_peers (path, GNUNET_NO);
+ tunnel_use_path (t, path);
+
+ peer_add_tunnel (dest_peer_info, t);
+
+ if (own_pos == size - 1)
+ {
+ struct MeshClient *c;
+
+ /* Find target client */
+ c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
+ if (NULL == c)
+ {
+ /* TODO send reject */
+ return GNUNET_OK;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
+ peer_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
+ /* This can be a retransmission due to a lost PATH ACK.
+ * Check if we already have a destination client for the tunnel. */
+ if (t->client != c)
+ {
+ /* Assign local tid */
+ while (NULL != tunnel_get_incoming (next_local_tid))
+ next_local_tid = (next_local_tid + 1) |
GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
+ t->local_tid_dest = next_local_tid++;
+ next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
+
+ if (GNUNET_YES == t->reliable)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
+ t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
+ t->bck_rel->t = t;
+ t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
+ }
+
+ tunnel_add_client (t, c);
+ send_local_tunnel_create (t);
+ }
+ send_path_ack (t);
+ /* Eliminate tunnel when origin dies */
+ tunnel_reset_timeout (t, GNUNET_YES);
+ /* Keep tunnel alive in direction dest->owner*/
+ tunnel_reset_timeout (t, GNUNET_NO);
+ }
+ else
+ {
+ struct MeshPeerPath *path2;
+
+ t->next_hop = path->peers[own_pos + 1];
+ GNUNET_PEER_change_rc(t->next_hop, 1);
+
+ /* It's for somebody else! Retransmit. */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
+ path2 = path_duplicate (path);
+ peer_add_path (dest_peer_info, path2, GNUNET_NO);
+ peer_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
+ send_path_create (t);
+ }
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Core handler for path ACKs
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_PathACK *msg;
+ struct MeshPeer *peer_info;
+ struct MeshPeerPath *p;
+ struct MeshTunnel *t;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
+ GNUNET_i2s (&my_full_id));
+ msg = (struct GNUNET_MESH_PathACK *) message;
+ t = tunnel_get (&msg->oid, ntohl(msg->tid));
+ if (NULL == t)
+ {
+ /* TODO notify that we don't know the tunnel */
+ GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1,
GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
+ GNUNET_i2s (&msg->oid), ntohl(msg->tid));
+ return GNUNET_OK;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
+ GNUNET_i2s (&msg->oid), ntohl(msg->tid));
+
+ peer_info = peer_get (&msg->peer_id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
+ GNUNET_i2s (&msg->peer_id));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
+ GNUNET_i2s (peer));
+
+ /* Add path to peers? */
+ p = t->path;
+ if (NULL != p)
+ {
+ path_add_to_peers (p, GNUNET_YES);
+ }
+ else
+ {
+ GNUNET_break (0);
+ }
+ tunnel_change_state (t, MESH_TUNNEL_READY);
+ tunnel_reset_timeout (t, GNUNET_NO);
+ t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
+ t->prev_fc.last_ack_sent = ntohl (msg->ack);
+
+ /* Message for us? */
+ if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct
GNUNET_PeerIdentity)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
+ if (NULL == t->owner)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ if (NULL != peer_info->dhtget)
+ {
+ GNUNET_DHT_get_stop (peer_info->dhtget);
+ peer_info->dhtget = NULL;
+ }
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, GNUNET_YES);
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, GNUNET_NO);
+ return GNUNET_OK;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " not for us, retransmitting...\n");
+ send_prebuilt_message (message, t->prev_hop, t);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Core handler for notifications of broken paths
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_PathBroken *msg;
+ struct MeshTunnel *t;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
+ msg = (struct GNUNET_MESH_PathBroken *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
+ GNUNET_i2s (&msg->peer1));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
+ GNUNET_i2s (&msg->peer2));
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+ if (NULL == t)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
+ GNUNET_PEER_search (&msg->peer2));
+ return GNUNET_OK;
+
+}
+
+
+/**
+ * Core handler for tunnel destruction
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_TunnelDestroy *msg;
+ struct MeshTunnel *t;
+
+ msg = (struct GNUNET_MESH_TunnelDestroy *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got a TUNNEL DESTROY packet from %s\n",
+ GNUNET_i2s (peer));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " for tunnel %s [%u]\n",
+ GNUNET_i2s (&msg->oid), ntohl (msg->tid));
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+ if (NULL == t)
+ {
+ /* Probably already got the message from another path,
+ * destroyed the tunnel and retransmitted to children.
+ * Safe to ignore.
+ */
+ GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
+ t->local_tid, t->local_tid_dest);
+ }
+ if (GNUNET_PEER_search (peer) == t->prev_hop)
+ {
+ // TODO check owner's signature
+ // TODO add owner's signatue to tunnel for retransmission
+ peer_cancel_queues (t->prev_hop, t);
+ GNUNET_PEER_change_rc (t->prev_hop, -1);
+ t->prev_hop = 0;
+ }
+ else if (GNUNET_PEER_search (peer) == t->next_hop)
+ {
+ // TODO check dest's signature
+ // TODO add dest's signatue to tunnel for retransmission
+ peer_cancel_queues (t->next_hop, t);
+ GNUNET_PEER_change_rc (t->next_hop, -1);
+ t->next_hop = 0;
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ // TODO check both owner AND destination's signature to see which matches
+ // TODO restransmit in appropriate direction
+ return GNUNET_OK;
+ }
+ tunnel_destroy_empty (t);
+
+ // TODO: add timeout to destroy the tunnel anyway
+ return GNUNET_OK;
+}
+
+
+/**
+ * Generic handler for mesh network payload traffic.
+ *
+ * @param peer Peer identity this notification is about.
+ * @param message 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_mesh_data (const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message,
+ int fwd)
+{
+ struct GNUNET_MESH_Data *msg;
+ struct MeshFlowControl *fc;
+ struct MeshTunnelReliability *rel;
+ struct MeshTunnel *t;
+ struct MeshClient *c;
+ GNUNET_PEER_Id hop;
+ uint32_t pid;
+ uint32_t ttl;
+ uint16_t type;
+ size_t size;
+
+ /* Check size */
+ size = ntohs (message->size);
+ if (size <
+ sizeof (struct GNUNET_MESH_Data) +
+ sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+ type =ntohs (message->type);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
+ GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
+ msg = (struct GNUNET_MESH_Data *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
+ GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
+ /* Check tunnel */
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+ if (NULL == t)
+ {
+ /* TODO notify back: we don't know this tunnel */
+ GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING tunnel unknown\n");
+ return GNUNET_OK;
+ }
+
+ /* Initialize FWD/BCK data */
+ pid = ntohl (msg->pid);
+ fc = fwd ? &t->prev_fc : &t->next_fc;
+ c = fwd ? t->client : t->owner;
+ rel = fwd ? t->bck_rel : t->fwd_rel;
+ hop = fwd ? t->next_hop : t->prev_hop;
+ if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
+ {
+ GNUNET_STATISTICS_update (stats, "# unsolicited data", 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 (NULL != c)
+ tunnel_change_state (t, MESH_TUNNEL_READY);
+ tunnel_reset_timeout (t, fwd);
+ if (NULL != c)
+ {
+ /* TODO signature verification */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us! sending to client\n");
+ GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
+ if (GMC_is_pid_bigger (pid, fc->last_pid_recv))
+ {
+ uint32_t mid;
+
+ mid = ntohl (msg->mid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " pid %u (mid %u) not seen yet\n", pid, mid);
+ fc->last_pid_recv = pid;
+
+ if (GNUNET_NO == t->reliable ||
+ ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
+ GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "!!! RECV %u\n", ntohl (msg->mid));
+ if (GNUNET_YES == t->reliable)
+ {
+ /* Is this the exact next expected messasge? */
+ if (mid == rel->mid_recv)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
+ rel->mid_recv++;
+ tunnel_send_client_data (t, msg, fwd);
+ tunnel_send_client_buffered_data (t, c, rel);
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
+ tunnel_add_buffered_data (t, msg, rel);
+ }
+ }
+ else /* Tunnel unreliable, send to clients directly */
+ {
+ tunnel_send_client_data (t, msg, fwd);
+ }
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " MID %u not expected (%u - %u), dropping!\n",
+ ntohl (msg->mid), rel->mid_recv, rel->mid_recv + 64);
+ }
+ }
+ else
+ {
+// 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);
+ }
+ tunnel_send_ack (t, type, fwd);
+ return GNUNET_OK;
+ }
+ fc->last_pid_recv = pid;
+ if (0 == hop)
+ {
+ GNUNET_STATISTICS_update (stats, "# data on dying tunnel", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "data on dying tunnel %s[%X]\n",
+ GNUNET_PEER_resolve2 (t->id.oid), ntohl (msg->tid));
+ return GNUNET_OK; /* Next hop has destoyed the tunnel, drop */
+ }
+ ttl = ntohl (msg->ttl);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
+ if (ttl == 0)
+ {
+ GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, fwd);
+ return GNUNET_OK;
+ }
+
+ if (myid != hop)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
+ send_prebuilt_message (message, hop, t);
+ GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Core handler for mesh network traffic going from the origin to a peer
+ *
+ * @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_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ return handle_mesh_data (peer, message, GNUNET_YES);
+}
+
+/**
+ * Core handler for mesh network traffic towards the owner of a tunnel.
+ *
+ * @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_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ return handle_mesh_data (peer, message, GNUNET_NO);
+}
+
+
+/**
+ * Core handler for mesh network traffic end-to-end ACKs.
+ *
+ * @param cls Closure.
+ * @param message Message.
+ * @param peer Peer identity this notification is about.
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_DataACK *msg;
+ struct MeshTunnelReliability *rel;
+ struct MeshReliableMessage *copy;
+ struct MeshReliableMessage *next;
+ struct MeshTunnel *t;
+ GNUNET_PEER_Id id;
+ uint32_t ack;
+ uint16_t type;
+ int work;
+
+ type = ntohs (message->type);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
+ GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
+ msg = (struct GNUNET_MESH_DataACK *) message;
+
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+ if (NULL == t)
+ {
+ /* TODO notify that we dont know this tunnel (whom)? */
+ GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ ack = ntohl (msg->mid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
+
+ /* Is this a forward or backward ACK? */
+ id = GNUNET_PEER_search (peer);
+ if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
+ if (NULL == t->owner)
+ {
+ send_prebuilt_message (message, t->prev_hop, t);
+ return GNUNET_OK;
+ }
+ rel = t->fwd_rel;
+ }
+ else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
+ if (NULL == t->client)
+ {
+ send_prebuilt_message (message, t->next_hop, t);
+ return GNUNET_OK;
+ }
+ rel = t->bck_rel;
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %u\n", ack);
+ for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
+ {
+ if (GMC_is_pid_bigger (copy->mid, ack))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
+ tunnel_free_sent_reliable (t, msg, rel);
+ break;
+ }
+ work = GNUNET_YES;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
+ next = copy->next;
+ tunnel_free_reliable_message (copy);
+ }
+ /* Once buffers have been free'd, send ACK */
+ tunnel_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,
+ &tunnel_retransmit_message,
+ rel);
+ }
+ }
+ else
+ GNUNET_break (0);
+ }
+ return GNUNET_OK;
+}
+
+/**
+ * Core handler for mesh network traffic point-to-point acks.
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_ACK *msg;
+ struct MeshTunnel *t;
+ struct MeshFlowControl *fc;
+ GNUNET_PEER_Id id;
+ uint32_t ack;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
+ GNUNET_i2s (peer));
+ msg = (struct GNUNET_MESH_ACK *) message;
+
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+
+ if (NULL == t)
+ {
+ /* TODO notify that we dont know this tunnel (whom)? */
+ GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ ack = ntohl (msg->pid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
+
+ /* Is this a forward or backward ACK? */
+ id = GNUNET_PEER_search (peer);
+ if (t->next_hop == id)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
+ fc = &t->next_fc;
+ }
+ else if (t->prev_hop == id)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
+ fc = &t->prev_fc;
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
+ GMC_is_pid_bigger (ack, fc->last_ack_recv))
+ {
+ GNUNET_SCHEDULER_cancel (fc->poll_task);
+ fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
+ fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
+ }
+
+ fc->last_ack_recv = ack;
+ peer_unlock_queue (id);
+ tunnel_change_state (t, MESH_TUNNEL_READY);
+
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, t->next_hop == id);
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * Core handler for mesh network traffic point-to-point ack polls.
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ *
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_Poll *msg;
+ struct MeshTunnel *t;
+ struct MeshFlowControl *fc;
+ GNUNET_PEER_Id id;
+ uint32_t pid;
+ uint32_t old;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
+ GNUNET_i2s (peer));
+
+ msg = (struct GNUNET_MESH_Poll *) message;
+
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+
+ if (NULL == t)
+ {
+ /* TODO notify that we dont know this tunnel (whom)? */
+ GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+
+ /* Is this a forward or backward ACK? */
+ id = GNUNET_PEER_search (peer);
+ pid = ntohl (msg->pid);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
+ if (t->next_hop == id)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
+ fc = &t->next_fc;
+ old = fc->last_pid_recv;
+ }
+ else if (t->prev_hop == id)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
+ fc = &t->prev_fc;
+ old = fc->last_pid_recv;
+ }
+ else
+ {
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", fc->last_pid_recv);
+ fc->last_pid_recv = pid;
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL, t->prev_hop == id);
+
+ if (GNUNET_YES == t->reliable)
+ fc->last_pid_recv = old;
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * Core handler for mesh keepalives.
+ *
+ * @param cls closure
+ * @param message message
+ * @param peer peer identity this notification is about
+ * @return GNUNET_OK to keep the connection open,
+ * GNUNET_SYSERR to close it (signal serious error)
+ *
+ * TODO: Check who we got this from, to validate route.
+ */
+static int
+handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_TunnelKeepAlive *msg;
+ struct MeshTunnel *t;
+ struct MeshClient *c;
+ GNUNET_PEER_Id hop;
+ int fwd;
+
+ msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
+ GNUNET_i2s (peer));
+
+ t = tunnel_get (&msg->oid, ntohl (msg->tid));
+ if (NULL == t)
+ {
+ /* TODO notify that we dont know that tunnel */
+ GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
+ GNUNET_NO);
+ return GNUNET_OK;
+ }
+
+ fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
+ GNUNET_YES : GNUNET_NO;
+ c = fwd ? t->client : t->owner;
+ hop = fwd ? t->next_hop : t->prev_hop;
+
+ if (NULL != c)
+ tunnel_change_state (t, MESH_TUNNEL_READY);
+ tunnel_reset_timeout (t, fwd);
+ if (NULL != c || 0 == hop || myid == hop)
+ return GNUNET_OK;
+
+ GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
+ send_prebuilt_message (message, hop, t);
+ return GNUNET_OK;
+ }
+
+
+
+/**
+ * Functions to handle messages from core
+ */
+static struct GNUNET_CORE_MessageHandler core_handlers[] = {
+ {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
+ {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
+ sizeof (struct GNUNET_MESH_PathBroken)},
+ {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
+ sizeof (struct GNUNET_MESH_TunnelDestroy)},
+ {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
+ {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
+ {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
+ sizeof (struct GNUNET_MESH_DataACK)},
+ {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
+ sizeof (struct GNUNET_MESH_DataACK)},
+ {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
+ sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
+ {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
+ sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
+ {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
+ sizeof (struct GNUNET_MESH_ACK)},
+ {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
+ sizeof (struct GNUNET_MESH_Poll)},
+ {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
+ sizeof (struct GNUNET_MESH_PathACK)},
+ {NULL, 0, 0}
+};
+
+
+/**
+ * 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
+ */
+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 GNUNET_PeerIdentity pi;
+ int i;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
+ GNUNET_PEER_resolve (peer->id, &pi);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
+
+ p = path_build_from_dht (get_path, get_path_length,
+ put_path, put_path_length);
+ path_add_to_peers (p, GNUNET_NO);
+ path_destroy (p);
+ for (i = 0; i < peer->ntunnels; i++)
+ {
+ struct GNUNET_PeerIdentity id;
+
+ GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
+ GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
+ peer->tunnels[i]->local_tid,
+ peer->tunnels[i]->local_tid_dest);
+ if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
+ peer_connect (peer, peer->tunnels[i]);
+ }
+ }
+
+ return;
+}
+
+
+/******************************************************************************/
+/********************* MESH LOCAL HANDLES
**************************/
+/******************************************************************************/
+
+
+/**
+ * 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;
+ 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;
+ struct MeshClient *next;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
+ if (client == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
+ return;
+ }
+
+ c = client_get (client);
+ if (NULL != c)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
+ c->id, c);
+ GNUNET_SERVER_client_drop (c->handle);
+ c->shutting_down = GNUNET_YES;
+ if (NULL != c->own_tunnels)
+ {
+ GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
+ &tunnel_destroy_iterator, c);
+ GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
+ }
+
+ if (NULL != c->incoming_tunnels)
+ {
+ GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
+ &tunnel_destroy_iterator, c);
+ GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
+ }
+
+ if (NULL != c->ports)
+ {
+ GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
+ &client_release_ports, c);
+ GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
+ }
+ next = c->next;
+ GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
+ GNUNET_free (c);
+ GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
+ c = next;
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
+ return;
+}
+
+
+/**
+ * Handler for new clients
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message, which includes messages the client wants
+ */
+static void
+handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_ClientConnect *cc_msg;
+ struct MeshClient *c;
+ unsigned int size;
+ uint32_t *p;
+ unsigned int i;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
+
+ /* Check data sanity */
+ size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
+ cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
+ if (0 != (size % sizeof (uint32_t)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ size /= sizeof (uint32_t);
+
+ /* Initialize new client structure */
+ c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
+ c->id = next_client_id++; /* overflow not important: just for debug */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
+ 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_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
+ c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
+ GNUNET_SERVER_notification_context_add (nc, client);
+ GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
+
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
+}
+
+
+/**
+ * Handler for requests of new tunnels
+ *
+ * @param cls Closure.
+ * @param client Identification of the client.
+ * @param message The actual message.
+ */
+static void
+handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_TunnelMessage *t_msg;
+ struct MeshPeer *peer_info;
+ struct MeshTunnel *t;
+ struct MeshClient *c;
+ MESH_TunnelNumber tid;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
+
+ /* Sanity check for client registration */
+ if (NULL == (c = client_get (client)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+
+ /* Message size sanity check */
+ if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
+ GNUNET_i2s (&t_msg->peer), ntohl (t_msg->port));
+ tid = ntohl (t_msg->tunnel_id);
+ /* Sanity check for duplicate tunnel IDs */
+ if (NULL != tunnel_get_by_local_id (c, tid))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ /* Create tunnel */
+ while (NULL != tunnel_get_by_pi (myid, next_tid))
+ next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
+ t = tunnel_new (myid, next_tid, c, tid);
+ next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
+ if (NULL == t)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ t->port = ntohl (t_msg->port);
+ tunnel_set_options (t, ntohl (t_msg->opt));
+ if (GNUNET_YES == t->reliable)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
+ t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
+ t->fwd_rel->t = t;
+ t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
+ GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
+
+ peer_info = peer_get (&t_msg->peer);
+ peer_add_tunnel (peer_info, t);
+ peer_connect (peer_info, t);
+ tunnel_reset_timeout (t, 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_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_TunnelMessage *tunnel_msg;
+ struct MeshClient *c;
+ struct MeshTunnel *t;
+ MESH_TunnelNumber tid;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got a DESTROY TUNNEL from client!\n");
+
+ /* Sanity check for client registration */
+ if (NULL == (c = client_get (client)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+
+ /* Message sanity check */
+ if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
+
+ /* Retrieve tunnel */
+ tid = ntohl (tunnel_msg->tunnel_id);
+ t = tunnel_get_by_local_id (c, tid);
+ if (NULL == t)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ /* Cleanup after the tunnel */
+ client_delete_tunnel (c, t);
+ if (c == t->client && GNUNET_MESH_LOCAL_TUNNEL_ID_SERV <= tid)
+ {
+ t->client = NULL;
+ }
+ else if (c == t->owner && GNUNET_MESH_LOCAL_TUNNEL_ID_SERV > tid)
+ {
+ peer_remove_tunnel (peer_get_short (t->dest), t);
+ t->owner = NULL;
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ " tunnel %X client %p (%p, %p)\n",
+ tid, c, t->owner, t->client);
+ GNUNET_break (0);
+ }
+
+ /* The tunnel will be destroyed when the last message is transmitted. */
+ tunnel_destroy_empty (t);
+
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+}
+
+
+/**
+ * Handler for client traffic
+ *
+ * @param cls closure
+ * @param client identification of the client
+ * @param message the actual message
+ */
+static void
+handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_LocalData *data_msg;
+ struct MeshClient *c;
+ struct MeshTunnel *t;
+ struct MeshFlowControl *fc;
+ MESH_TunnelNumber tid;
+ size_t size;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got data from a client!\n");
+
+ /* Sanity check for client registration */
+ if (NULL == (c = client_get (client)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+
+ data_msg = (struct GNUNET_MESH_LocalData *) message;
+
+ /* Sanity check for message size */
+ size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
+ if (size < sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ /* Tunnel exists? */
+ tid = ntohl (data_msg->tid);
+ t = tunnel_get_by_local_id (c, tid);
+ if (NULL == t)
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ /* Is the client in the tunnel? */
+ if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
+ t->owner &&
+ t->owner->handle == client)
+ ||
+ (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
+ t->client &&
+ t->client->handle == client) ) )
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ /* Ok, everything is correct, send the message
+ * (pretend we got it from a mesh peer)
+ */
+ {
+ struct GNUNET_MESH_Data *payload;
+ char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
+
+ fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
+ if (GNUNET_YES == t->reliable)
+ {
+ struct MeshTunnelReliability *rel;
+ struct MeshReliableMessage *copy;
+
+ rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
+ copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
+ + sizeof(struct GNUNET_MESH_Data)
+ + size);
+ copy->mid = rel->mid_sent++;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->mid);
+ copy->timestamp = GNUNET_TIME_absolute_get ();
+ copy->rel = rel;
+ 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,
+ &tunnel_retransmit_message,
+ rel);
+ }
+ payload = (struct GNUNET_MESH_Data *) ©[1];
+ payload->mid = htonl (copy->mid);
+ }
+ else
+ {
+ payload = (struct GNUNET_MESH_Data *) cbuf;
+ payload->mid = htonl (fc->last_pid_recv + 1);
+ }
+ memcpy (&payload[1], &data_msg[1], size);
+ payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
+ payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
+ GNUNET_MESSAGE_TYPE_MESH_UNICAST :
+ GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
+ GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
+ payload->tid = htonl (t->id.tid);
+ payload->ttl = htonl (default_ttl);
+ payload->pid = htonl (fc->last_pid_recv + 1);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ " calling generic handler...\n");
+ if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
+ handle_mesh_unicast (NULL, &my_full_id, &payload->header);
+ else
+ handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+
+ return;
+}
+
+
+/**
+ * Handler for client's ACKs for payload traffic.
+ *
+ * @param cls Closure (unused).
+ * @param client Identification of the client.
+ * @param message The actual message.
+ */
+static void
+handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct GNUNET_MESH_LocalAck *msg;
+ struct MeshTunnel *t;
+ struct MeshClient *c;
+ MESH_TunnelNumber tid;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
+ /* Sanity check for client registration */
+ if (NULL == (c = client_get (client)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
+
+ msg = (struct GNUNET_MESH_LocalAck *) message;
+
+ /* Tunnel exists? */
+ tid = ntohl (msg->tunnel_id);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
+ t = tunnel_get_by_local_id (c, tid);
+ if (NULL == t)
+ {
+ GNUNET_break (0);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
+ if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
+ {
+ /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
+ t->prev_fc.last_ack_recv++;
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_NO);
+ }
+ else
+ {
+ /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
+ t->next_fc.last_ack_recv++;
+ tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_YES);
+ }
+
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+
+ return;
+}
+
+
+
+/**
+ * Iterator over all tunnels to send a monitoring client info about each
tunnel.
+ *
+ * @param cls Closure (client handle).
+ * @param key Key (hashed tunnel ID, unused).
+ * @param value Tunnel info.
+ *
+ * @return GNUNET_YES, to keep iterating.
+ */
+static int
+monitor_all_tunnels_iterator (void *cls,
+ const struct GNUNET_HashCode * key,
+ void *value)
+{
+ struct GNUNET_SERVER_Client *client = cls;
+ struct MeshTunnel *t = value;
+ struct GNUNET_MESH_LocalMonitor *msg;
+
+ msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
+ GNUNET_PEER_resolve(t->id.oid, &msg->owner);
+ msg->tunnel_id = htonl (t->id.tid);
+ msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
+ GNUNET_PEER_resolve (t->dest, &msg->destination);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "* sending info about tunnel %s [%u]\n",
+ GNUNET_i2s (&msg->owner), t->id.tid);
+
+ GNUNET_SERVER_notification_context_unicast (nc, client,
+ &msg->header, GNUNET_NO);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Handler for client's MONITOR request.
+ *
+ * @param cls Closure (unused).
+ * @param client Identification of the client.
+ * @param message The actual message.
+ */
+static void
+handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ struct MeshClient *c;
+
+ /* Sanity check for client registration */
+ if (NULL == (c = client_get (client)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Received get tunnels request from client %u\n",
+ c->id);
+ GNUNET_CONTAINER_multihashmap_iterate (tunnels,
+ monitor_all_tunnels_iterator,
+ client);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Get tunnels request from client %u completed\n",
+ c->id);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Handler for client's MONITOR_TUNNEL request.
+ *
+ * @param cls Closure (unused).
+ * @param client Identification of the client.
+ * @param message The actual message.
+ */
+static void
+handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader *message)
+{
+ const struct GNUNET_MESH_LocalMonitor *msg;
+ struct GNUNET_MESH_LocalMonitor *resp;
+ struct MeshClient *c;
+ struct MeshTunnel *t;
+
+ /* Sanity check for client registration */
+ if (NULL == (c = client_get (client)))
+ {
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+
+ msg = (struct GNUNET_MESH_LocalMonitor *) message;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Received tunnel info request from client %u for tunnel
%s[%X]\n",
+ c->id,
+ &msg->owner,
+ ntohl (msg->tunnel_id));
+ t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
+ if (NULL == t)
+ {
+ /* We don't know the tunnel FIXME */
+ struct GNUNET_MESH_LocalMonitor warn;
+
+ warn = *msg;
+ GNUNET_SERVER_notification_context_unicast (nc, client,
+ &warn.header,
+ GNUNET_NO);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+ return;
+ }
+
+ /* Initialize context */
+ resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
+ *resp = *msg;
+ GNUNET_PEER_resolve (t->dest, &resp->destination);
+ resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
+ GNUNET_SERVER_notification_context_unicast (nc, c->handle,
+ &resp->header, GNUNET_NO);
+ GNUNET_free (resp);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Monitor tunnel request from client %u completed\n",
+ c->id);
+ GNUNET_SERVER_receive_done (client, GNUNET_OK);
+}
+
+
+/**
+ * Functions to handle messages from clients
+ */
+static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
+ {&handle_local_new_client, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
+ {&handle_local_tunnel_create, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
+ sizeof (struct GNUNET_MESH_TunnelMessage)},
+ {&handle_local_tunnel_destroy, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
+ sizeof (struct GNUNET_MESH_TunnelMessage)},
+ {&handle_local_data, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
+ {&handle_local_ack, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
+ sizeof (struct GNUNET_MESH_LocalAck)},
+ {&handle_local_get_tunnels, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
+ sizeof (struct GNUNET_MessageHeader)},
+ {&handle_local_show_tunnel, NULL,
+ GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
+ sizeof (struct GNUNET_MESH_LocalMonitor)},
+ {NULL, NULL, 0, 0}
+};
+
+
+/**
+ * Method called whenever a given peer connects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ */
+static void
+core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
+{
+ struct MeshPeer *peer_info;
+ struct MeshPeerPath *path;
+
+ DEBUG_CONN ("Peer connected\n");
+ DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
+ peer_info = peer_get (peer);
+ if (myid == peer_info->id)
+ {
+ DEBUG_CONN (" (self)\n");
+ path = path_new (1);
+ }
+ else
+ {
+ DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
+ path = path_new (2);
+ path->peers[1] = peer_info->id;
+ GNUNET_PEER_change_rc (peer_info->id, 1);
+ GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
+ }
+ path->peers[0] = myid;
+ GNUNET_PEER_change_rc (myid, 1);
+ peer_add_path (peer_info, path, GNUNET_YES);
+ return;
+}
+
+
+/**
+ * Method called whenever a peer disconnects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ */
+static void
+core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+{
+ struct MeshPeer *pi;
+ struct MeshPeerQueue *q;
+ struct MeshPeerQueue *n;
+
+ DEBUG_CONN ("Peer disconnected\n");
+ pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (NULL == pi)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ q = pi->queue_head;
+ while (NULL != q)
+ {
+ n = q->next;
+ /* TODO try to reroute this traffic instead */
+ queue_destroy(q, GNUNET_YES);
+ q = n;
+ }
+ if (NULL != pi->core_transmit)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
+ pi->core_transmit = NULL;
+ }
+ peer_remove_path (pi, pi->id, myid);
+ if (myid == pi->id)
+ {
+ DEBUG_CONN (" (self)\n");
+ }
+ GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
+ return;
+}
+
+
+/**
+ * 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);
+}
+
+
+/**
+ * To be called on core init/fail.
+ *
+ * @param cls Closure (config)
+ * @param server handle to the server for this service
+ * @param identity the public identity of this peer
+ */
+static void
+core_init (void *cls, struct GNUNET_CORE_Handle *server,
+ const struct GNUNET_PeerIdentity *identity)
+{
+ const struct GNUNET_CONFIGURATION_Handle *c = cls;
+ static int i = 0;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
+ GNUNET_break (core_handle == server);
+ if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
+ NULL == server)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ " core id %s\n",
+ GNUNET_i2s (identity));
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ " my id %s\n",
+ GNUNET_i2s (&my_full_id));
+ GNUNET_CORE_disconnect (core_handle);
+ core_handle = GNUNET_CORE_connect (c, /* Main configuration */
+ NULL, /* Closure passed to MESH
functions */
+ &core_init, /* Call core_init
once connected */
+ &core_connect, /* Handle connects */
+ &core_disconnect, /* remove peers on
disconnects */
+ NULL, /* Don't notify about all
incoming messages */
+ GNUNET_NO, /* For header only in
notification */
+ NULL, /* Don't notify about all
outbound messages */
+ GNUNET_NO, /* For header-only out
notification */
+ core_handlers); /* Register these
handlers */
+ if (10 < i++)
+ GNUNET_abort();
+ }
+ server_init ();
+ return;
+}
+
+
+/******************************************************************************/
+/************************ MAIN FUNCTIONS
****************************/
+/******************************************************************************/
+
+/**
+ * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
+ *
+ * @param cls closure
+ * @param key current key code
+ * @param value value in the hash map
+ * @return GNUNET_YES if we should continue to iterate,
+ * GNUNET_NO if not.
+ */
+static int
+shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
+{
+ struct MeshTunnel *t = value;
+
+ tunnel_destroy (t);
+ return GNUNET_YES;
+}
+
+/**
+ * Iterator over peer hash map entries to destroy the tunnel during shutdown.
+ *
+ * @param cls closure
+ * @param key current key code
+ * @param value value in the hash map
+ * @return GNUNET_YES if we should continue to iterate,
+ * GNUNET_NO if not.
+ */
+static int
+shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
+{
+ struct MeshPeer *p = value;
+ struct MeshPeerQueue *q;
+ struct MeshPeerQueue *n;
+
+ q = p->queue_head;
+ while (NULL != q)
+ {
+ n = q->next;
+ if (q->peer == p)
+ {
+ queue_destroy(q, GNUNET_YES);
+ }
+ q = n;
+ }
+ peer_destroy (p);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Task run during shutdown.
+ *
+ * @param cls unused
+ * @param tc unused
+ */
+static void
+shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
+
+ if (core_handle != NULL)
+ {
+ GNUNET_CORE_disconnect (core_handle);
+ core_handle = NULL;
+ }
+ GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
+ GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
+ if (dht_handle != NULL)
+ {
+ GNUNET_DHT_disconnect (dht_handle);
+ dht_handle = NULL;
+ }
+ if (nc != NULL)
+ {
+ GNUNET_SERVER_notification_context_destroy (nc);
+ nc = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
+ {
+ GNUNET_SCHEDULER_cancel (announce_id_task);
+ announce_id_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
+}
+
+
+/**
+ * Process mesh requests.
+ *
+ * @param cls closure
+ * @param server the initialized server
+ * @param c configuration to use
+ */
+static void
+run (void *cls, struct GNUNET_SERVER_Handle *server,
+ const struct GNUNET_CONFIGURATION_Handle *c)
+{
+ char *keyfile;
+ struct GNUNET_CRYPTO_EccPrivateKey *pk;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
+ server_handle = server;
+ GNUNET_SERVER_suspend (server_handle);
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
+ &keyfile))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("%s service is lacking key configuration settings (%s).
Exiting.\n"),
+ "mesh", "peer/privatekey");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
+ &refresh_path_time))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("%s service is lacking key configuration settings (%s).
Exiting.\n"),
+ "mesh", "refresh path time");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
+ &id_announce_time))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("%s service is lacking key configuration settings (%s).
Exiting.\n"),
+ "mesh", "id announce time");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
+ &connect_timeout))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("%s service is lacking key configuration settings (%s).
Exiting.\n"),
+ "mesh", "connect timeout");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
+ &max_msgs_queue))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("%s service is lacking key configuration settings (%s).
Exiting.\n"),
+ "mesh", "max msgs queue");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
+ &max_tunnels))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("%s service is lacking key configuration settings (%s).
Exiting.\n"),
+ "mesh", "max tunnels");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
+ &default_ttl))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("%s service is lacking key configuration settings (%s). Using
default (%u).\n"),
+ "mesh", "default ttl", 64);
+ default_ttl = 64;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
+ &max_peers))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("%s service is lacking key configuration settings (%s).
Using default (%u).\n"),
+ "mesh", "max peers", 1000);
+ max_peers = 1000;
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
+ &drop_percent))
+ {
+ drop_percent = 0;
+ }
+ else
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Mesh is running with drop mode enabled. "
+ "This is NOT a good idea! "
+ "Remove the DROP_PERCENT option from your configuration.\n");
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (c, "MESH",
"DHT_REPLICATION_LEVEL",
+ &dht_replication_level))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _
+ ("%s service is lacking key configuration settings (%s). Using
default (%u).\n"),
+ "mesh", "dht replication level", 3);
+ dht_replication_level = 3;
+ }
+
+ tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
+ incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
+ peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
+ ports = GNUNET_CONTAINER_multihashmap32_create (32);
+
+ dht_handle = GNUNET_DHT_connect (c, 64);
+ if (NULL == dht_handle)
+ {
+ GNUNET_break (0);
+ }
+ stats = GNUNET_STATISTICS_create ("mesh", c);
+
+ /* Scheduled the task to clean up when shutdown is called */
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
+ NULL);
+ pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
+ GNUNET_free (keyfile);
+ GNUNET_assert (NULL != pk);
+ my_private_key = pk;
+ GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
+ GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
+ &my_full_id.hashPubKey);
+ myid = GNUNET_PEER_intern (&my_full_id);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Mesh for peer [%s] starting\n",
+ GNUNET_i2s(&my_full_id));
+
+ core_handle = GNUNET_CORE_connect (c, /* Main configuration */
+ NULL, /* Closure passed to MESH
functions */
+ &core_init, /* Call core_init once
connected */
+ &core_connect, /* Handle connects */
+ &core_disconnect, /* remove peers on
disconnects */
+ NULL, /* Don't notify about all
incoming messages */
+ GNUNET_NO, /* For header only in
notification */
+ NULL, /* Don't notify about all
outbound messages */
+ GNUNET_NO, /* For header-only out
notification */
+ core_handlers); /* Register these
handlers */
+ if (NULL == core_handle)
+ {
+ GNUNET_break (0);
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ next_tid = 0;
+ next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
+ announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
+}
+
+
+/**
+ * The main function for the mesh service.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+ int ret;
+ int r;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
+ r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
+ NULL);
+ ret = (GNUNET_OK == r) ? 0 : 1;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
+
+ INTERVAL_SHOW;
+
+ return ret;
+}
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