/*
This file is part of GNUnet.
Copyright (C) 2013-2015 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
/**
* @file rps/gnunet-service-rps.c
* @brief rps service implementation
* @author Julius Bünger
*/
#include "platform.h"
#include "gnunet_applications.h"
#include "gnunet_util_lib.h"
#include "gnunet_cadet_service.h"
#include "gnunet_peerinfo_service.h"
#include "gnunet_nse_service.h"
#include "gnunet_statistics_service.h"
#include "rps.h"
#include "rps-test_util.h"
#include "gnunet-service-rps_sampler.h"
#include "gnunet-service-rps_custommap.h"
#include "gnunet-service-rps_view.h"
#include
#include
#define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__)
// TODO modify @brief in every file
// TODO check for overflows
// TODO align message structs
// TODO connect to friends
// TODO store peers somewhere persistent
// TODO blacklist? (-> mal peer detection on top of brahms)
// hist_size_init, hist_size_max
/**
* Our configuration.
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle to the statistics service.
*/
struct GNUNET_STATISTICS_Handle *stats;
/**
* Our own identity.
*/
static struct GNUNET_PeerIdentity own_identity;
static int in_shutdown = GNUNET_NO;
/**
* @brief Port used for cadet.
*
* Don't compute multiple times through making it global
*/
static struct GNUNET_HashCode port;
/***********************************************************************
* Old gnunet-service-rps_peers.c
***********************************************************************/
/**
* Set a peer flag of given peer context.
*/
#define SET_PEER_FLAG(peer_ctx, mask) ((peer_ctx->peer_flags) |= (mask))
/**
* Get peer flag of given peer context.
*/
#define check_peer_flag_set(peer_ctx, mask)\
((peer_ctx->peer_flags) & (mask) ? GNUNET_YES : GNUNET_NO)
/**
* Unset flag of given peer context.
*/
#define UNSET_PEER_FLAG(peer_ctx, mask) ((peer_ctx->peer_flags) &= ~(mask))
/**
* Get channel flag of given channel context.
*/
#define check_channel_flag_set(channel_flags, mask)\
((*channel_flags) & (mask) ? GNUNET_YES : GNUNET_NO)
/**
* Unset flag of given channel context.
*/
#define unset_channel_flag(channel_flags, mask) ((*channel_flags) &= ~(mask))
/**
* Pending operation on peer consisting of callback and closure
*
* When an operation cannot be executed right now this struct is used to store
* the callback and closure for later execution.
*/
struct PeerPendingOp
{
/**
* Callback
*/
PeerOp op;
/**
* Closure
*/
void *op_cls;
};
/**
* List containing all messages that are yet to be send
*
* This is used to keep track of all messages that have not been sent yet. When
* a peer is to be removed the pending messages can be removed properly.
*/
struct PendingMessage
{
/**
* DLL next, prev
*/
struct PendingMessage *next;
struct PendingMessage *prev;
/**
* The envelope to the corresponding message
*/
struct GNUNET_MQ_Envelope *ev;
/**
* The corresponding context
*/
struct PeerContext *peer_ctx;
/**
* The message type
*/
const char *type;
};
/**
* @brief Context for a channel
*/
struct ChannelCtx;
/**
* Struct used to keep track of other peer's status
*
* This is stored in a multipeermap.
* It contains information such as cadet channels, a message queue for sending,
* status about the channels, the pending operations on this peer and some flags
* about the status of the peer itself. (live, valid, ...)
*/
struct PeerContext
{
/**
* Message queue open to client
*/
struct GNUNET_MQ_Handle *mq;
/**
* Channel open to client.
*/
struct ChannelCtx *send_channel_ctx;
/**
* Channel open from client.
*/
struct ChannelCtx *recv_channel_ctx;
/**
* Array of pending operations on this peer.
*/
struct PeerPendingOp *pending_ops;
/**
* Handle to the callback given to cadet_ntfy_tmt_rdy()
*
* To be canceled on shutdown.
*/
struct PendingMessage *liveliness_check_pending;
/**
* Number of pending operations.
*/
unsigned int num_pending_ops;
/**
* Identity of the peer
*/
struct GNUNET_PeerIdentity peer_id;
/**
* Flags indicating status of peer
*/
uint32_t peer_flags;
/**
* Last time we received something from that peer.
*/
struct GNUNET_TIME_Absolute last_message_recv;
/**
* Last time we received a keepalive message.
*/
struct GNUNET_TIME_Absolute last_keepalive;
/**
* DLL with all messages that are yet to be sent
*/
struct PendingMessage *pending_messages_head;
struct PendingMessage *pending_messages_tail;
/**
* This is pobably followed by 'statistical' data (when we first saw
* it, how did we get its ID, how many pushes (in a timeinterval),
* ...)
*/
};
/**
* @brief Closure to #valid_peer_iterator
*/
struct PeersIteratorCls
{
/**
* Iterator function
*/
PeersIterator iterator;
/**
* Closure to iterator
*/
void *cls;
};
/**
* @brief Context for a channel
*/
struct ChannelCtx
{
/**
* @brief The channel itself
*/
struct GNUNET_CADET_Channel *channel;
/**
* @brief The peer context associated with the channel
*/
struct PeerContext *peer_ctx;
/**
* @brief When channel destruction needs to be delayed (because it is called
* from within the cadet routine of another channel destruction) this task
* refers to the respective _SCHEDULER_Task.
*/
struct GNUNET_SCHEDULER_Task *destruction_task;
};
/**
* @brief Hashmap of valid peers.
*/
static struct GNUNET_CONTAINER_MultiPeerMap *valid_peers;
/**
* @brief Maximum number of valid peers to keep.
* TODO read from config
*/
static uint32_t num_valid_peers_max = UINT32_MAX;
/**
* @brief Filename of the file that stores the valid peers persistently.
*/
static char *filename_valid_peers;
/**
* Set of all peers to keep track of them.
*/
static struct GNUNET_CONTAINER_MultiPeerMap *peer_map;
/**
* Cadet handle.
*/
static struct GNUNET_CADET_Handle *cadet_handle;
/**
* @brief Get the #PeerContext associated with a peer
*
* @param peer the peer id
*
* @return the #PeerContext
*/
static struct PeerContext *
get_peer_ctx (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *ctx;
int ret;
ret = GNUNET_CONTAINER_multipeermap_contains (peer_map, peer);
GNUNET_assert (GNUNET_YES == ret);
ctx = GNUNET_CONTAINER_multipeermap_get (peer_map, peer);
GNUNET_assert (NULL != ctx);
return ctx;
}
/**
* @brief Check whether we have information about the given peer.
*
* FIXME probably deprecated. Make this the new _online.
*
* @param peer peer in question
*
* @return #GNUNET_YES if peer is known
* #GNUNET_NO if peer is not knwon
*/
static int
check_peer_known (const struct GNUNET_PeerIdentity *peer)
{
if (NULL != peer_map)
{
return GNUNET_CONTAINER_multipeermap_contains (peer_map, peer);
} else
{
return GNUNET_NO;
}
}
/**
* @brief Create a new #PeerContext and insert it into the peer map
*
* @param peer the peer to create the #PeerContext for
*
* @return the #PeerContext
*/
static struct PeerContext *
create_peer_ctx (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *ctx;
int ret;
GNUNET_assert (GNUNET_NO == check_peer_known (peer));
ctx = GNUNET_new (struct PeerContext);
ctx->peer_id = *peer;
ret = GNUNET_CONTAINER_multipeermap_put (peer_map, peer, ctx,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
GNUNET_assert (GNUNET_OK == ret);
return ctx;
}
/**
* @brief Create or get a #PeerContext
*
* @param peer the peer to get the associated context to
*
* @return the context
*/
static struct PeerContext *
create_or_get_peer_ctx (const struct GNUNET_PeerIdentity *peer)
{
if (GNUNET_NO == check_peer_known (peer))
{
return create_peer_ctx (peer);
}
return get_peer_ctx (peer);
}
/**
* @brief Check whether we have a connection to this @a peer
*
* Also sets the #Peers_ONLINE flag accordingly
*
* @param peer the peer in question
*
* @return #GNUNET_YES if we are connected
* #GNUNET_NO otherwise
*/
static int
check_connected (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
/* If we don't know about this peer we don't know whether it's online */
if (GNUNET_NO == check_peer_known (peer))
{
return GNUNET_NO;
}
/* Get the context */
peer_ctx = get_peer_ctx (peer);
/* If we have no channel to this peer we don't know whether it's online */
if ( (NULL == peer_ctx->send_channel_ctx) &&
(NULL == peer_ctx->recv_channel_ctx) )
{
UNSET_PEER_FLAG (peer_ctx, Peers_ONLINE);
return GNUNET_NO;
}
/* Otherwise (if we have a channel, we know that it's online */
SET_PEER_FLAG (peer_ctx, Peers_ONLINE);
return GNUNET_YES;
}
/**
* @brief The closure to #get_rand_peer_iterator.
*/
struct GetRandPeerIteratorCls
{
/**
* @brief The index of the peer to return.
* Will be decreased until 0.
* Then current peer is returned.
*/
uint32_t index;
/**
* @brief Pointer to peer to return.
*/
const struct GNUNET_PeerIdentity *peer;
};
/**
* @brief Iterator function for #get_random_peer_from_peermap.
*
* Implements #GNUNET_CONTAINER_PeerMapIterator.
* Decreases the index until the index is null.
* Then returns the current peer.
*
* @param cls the #GetRandPeerIteratorCls containing index and peer
* @param peer current peer
* @param value unused
*
* @return #GNUNET_YES if we should continue to
* iterate,
* #GNUNET_NO if not.
*/
static int
get_rand_peer_iterator (void *cls,
const struct GNUNET_PeerIdentity *peer,
void *value)
{
struct GetRandPeerIteratorCls *iterator_cls = cls;
(void) value;
if (0 >= iterator_cls->index)
{
iterator_cls->peer = peer;
return GNUNET_NO;
}
iterator_cls->index--;
return GNUNET_YES;
}
/**
* @brief Get a random peer from @a peer_map
*
* @param peer_map the peer_map to get the peer from
*
* @return a random peer
*/
static const struct GNUNET_PeerIdentity *
get_random_peer_from_peermap (const struct
GNUNET_CONTAINER_MultiPeerMap *peer_map)
{
struct GetRandPeerIteratorCls *iterator_cls;
const struct GNUNET_PeerIdentity *ret;
iterator_cls = GNUNET_new (struct GetRandPeerIteratorCls);
iterator_cls->index = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
GNUNET_CONTAINER_multipeermap_size (peer_map));
(void) GNUNET_CONTAINER_multipeermap_iterate (valid_peers,
get_rand_peer_iterator,
iterator_cls);
ret = iterator_cls->peer;
GNUNET_free (iterator_cls);
return ret;
}
/**
* @brief Add a given @a peer to valid peers.
*
* If valid peers are already #num_valid_peers_max, delete a peer previously.
*
* @param peer the peer that is added to the valid peers.
*
* @return #GNUNET_YES if no other peer had to be removed
* #GNUNET_NO otherwise
*/
static int
add_valid_peer (const struct GNUNET_PeerIdentity *peer)
{
const struct GNUNET_PeerIdentity *rand_peer;
int ret;
ret = GNUNET_YES;
while (GNUNET_CONTAINER_multipeermap_size (valid_peers) >= num_valid_peers_max)
{
rand_peer = get_random_peer_from_peermap (valid_peers);
GNUNET_CONTAINER_multipeermap_remove_all (valid_peers, rand_peer);
ret = GNUNET_NO;
}
(void) GNUNET_CONTAINER_multipeermap_put (valid_peers, peer, NULL,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
GNUNET_STATISTICS_set (stats,
"# valid peers",
GNUNET_CONTAINER_multipeermap_size (valid_peers),
GNUNET_NO);
return ret;
}
static void
remove_pending_message (struct PendingMessage *pending_msg, int cancel);
/**
* @brief Set the peer flag to living and
* call the pending operations on this peer.
*
* Also adds peer to #valid_peers.
*
* @param peer_ctx the #PeerContext of the peer to set live
*/
static void
set_peer_live (struct PeerContext *peer_ctx)
{
struct GNUNET_PeerIdentity *peer;
unsigned int i;
peer = &peer_ctx->peer_id;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Peer %s is live and valid, calling %i pending operations on it\n",
GNUNET_i2s (peer),
peer_ctx->num_pending_ops);
if (NULL != peer_ctx->liveliness_check_pending)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Removing pending liveliness check for peer %s\n",
GNUNET_i2s (&peer_ctx->peer_id));
// TODO wait until cadet sets mq->cancel_impl
//GNUNET_MQ_send_cancel (peer_ctx->liveliness_check_pending->ev);
remove_pending_message (peer_ctx->liveliness_check_pending, GNUNET_YES);
peer_ctx->liveliness_check_pending = NULL;
}
(void) add_valid_peer (peer);
SET_PEER_FLAG (peer_ctx, Peers_ONLINE);
/* Call pending operations */
for (i = 0; i < peer_ctx->num_pending_ops; i++)
{
peer_ctx->pending_ops[i].op (peer_ctx->pending_ops[i].op_cls, peer);
}
GNUNET_array_grow (peer_ctx->pending_ops, peer_ctx->num_pending_ops, 0);
}
static void
cleanup_destroyed_channel (void *cls,
const struct GNUNET_CADET_Channel *channel);
/* Declaration of handlers */
static void
handle_peer_check (void *cls,
const struct GNUNET_MessageHeader *msg);
static void
handle_peer_push (void *cls,
const struct GNUNET_MessageHeader *msg);
static void
handle_peer_pull_request (void *cls,
const struct GNUNET_MessageHeader *msg);
static int
check_peer_pull_reply (void *cls,
const struct GNUNET_RPS_P2P_PullReplyMessage *msg);
static void
handle_peer_pull_reply (void *cls,
const struct GNUNET_RPS_P2P_PullReplyMessage *msg);
/* End declaration of handlers */
/**
* @brief Allocate memory for a new channel context and insert it into DLL
*
* @param peer_ctx context of the according peer
*
* @return The channel context
*/
static struct ChannelCtx *
add_channel_ctx (struct PeerContext *peer_ctx)
{
struct ChannelCtx *channel_ctx;
channel_ctx = GNUNET_new (struct ChannelCtx);
channel_ctx->peer_ctx = peer_ctx;
return channel_ctx;
}
/**
* @brief Free memory and NULL pointers.
*
* @param channel_ctx The channel context.
*/
static void
remove_channel_ctx (struct ChannelCtx *channel_ctx)
{
struct PeerContext *peer_ctx = channel_ctx->peer_ctx;
if (NULL != channel_ctx->destruction_task)
{
GNUNET_SCHEDULER_cancel (channel_ctx->destruction_task);
channel_ctx->destruction_task = NULL;
}
GNUNET_free (channel_ctx);
if (NULL == peer_ctx) return;
if (channel_ctx == peer_ctx->send_channel_ctx)
{
peer_ctx->send_channel_ctx = NULL;
peer_ctx->mq = NULL;
}
else if (channel_ctx == peer_ctx->recv_channel_ctx)
{
peer_ctx->recv_channel_ctx = NULL;
}
}
/**
* @brief Get the channel of a peer. If not existing, create.
*
* @param peer the peer id
* @return the #GNUNET_CADET_Channel used to send data to @a peer
*/
struct GNUNET_CADET_Channel *
get_channel (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
struct GNUNET_PeerIdentity *ctx_peer;
/* There exists a copy-paste-clone in run() */
struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
GNUNET_MQ_hd_fixed_size (peer_check,
GNUNET_MESSAGE_TYPE_RPS_PP_CHECK_LIVE,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_hd_fixed_size (peer_push,
GNUNET_MESSAGE_TYPE_RPS_PP_PUSH,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_hd_fixed_size (peer_pull_request,
GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_hd_var_size (peer_pull_reply,
GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY,
struct GNUNET_RPS_P2P_PullReplyMessage,
NULL),
GNUNET_MQ_handler_end ()
};
peer_ctx = get_peer_ctx (peer);
if (NULL == peer_ctx->send_channel_ctx)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Trying to establish channel to peer %s\n",
GNUNET_i2s (peer));
ctx_peer = GNUNET_new (struct GNUNET_PeerIdentity);
*ctx_peer = *peer;
peer_ctx->send_channel_ctx = add_channel_ctx (peer_ctx);
peer_ctx->send_channel_ctx->channel =
GNUNET_CADET_channel_create (cadet_handle,
peer_ctx->send_channel_ctx, /* context */
peer,
&port,
GNUNET_CADET_OPTION_RELIABLE,
NULL, /* WindowSize handler */
&cleanup_destroyed_channel, /* Disconnect handler */
cadet_handlers);
}
GNUNET_assert (NULL != peer_ctx->send_channel_ctx);
GNUNET_assert (NULL != peer_ctx->send_channel_ctx->channel);
return peer_ctx->send_channel_ctx->channel;
}
/**
* Get the message queue (#GNUNET_MQ_Handle) of a specific peer.
*
* If we already have a message queue open to this client,
* simply return it, otherways create one.
*
* @param peer the peer to get the mq to
* @return the #GNUNET_MQ_Handle
*/
static struct GNUNET_MQ_Handle *
get_mq (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
peer_ctx = get_peer_ctx (peer);
if (NULL == peer_ctx->mq)
{
peer_ctx->mq = GNUNET_CADET_get_mq (get_channel (peer));
}
return peer_ctx->mq;
}
/**
* @brief Add an envelope to a message passed to mq to list of pending messages
*
* @param peer peer the message was sent to
* @param ev envelope to the message
* @param type type of the message to be sent
* @return pointer to pending message
*/
static struct PendingMessage *
insert_pending_message (const struct GNUNET_PeerIdentity *peer,
struct GNUNET_MQ_Envelope *ev,
const char *type)
{
struct PendingMessage *pending_msg;
struct PeerContext *peer_ctx;
peer_ctx = get_peer_ctx (peer);
pending_msg = GNUNET_new (struct PendingMessage);
pending_msg->ev = ev;
pending_msg->peer_ctx = peer_ctx;
pending_msg->type = type;
GNUNET_CONTAINER_DLL_insert (peer_ctx->pending_messages_head,
peer_ctx->pending_messages_tail,
pending_msg);
return pending_msg;
}
/**
* @brief Remove a pending message from the respective DLL
*
* @param pending_msg the pending message to remove
* @param cancel whether to cancel the pending message, too
*/
static void
remove_pending_message (struct PendingMessage *pending_msg, int cancel)
{
struct PeerContext *peer_ctx;
(void) cancel;
peer_ctx = pending_msg->peer_ctx;
GNUNET_assert (NULL != peer_ctx);
GNUNET_CONTAINER_DLL_remove (peer_ctx->pending_messages_head,
peer_ctx->pending_messages_tail,
pending_msg);
// TODO wait for the cadet implementation of message cancellation
//if (GNUNET_YES == cancel)
//{
// GNUNET_MQ_send_cancel (pending_msg->ev);
//}
GNUNET_free (pending_msg);
}
/**
* @brief This is called in response to the first message we sent as a
* liveliness check.
*
* @param cls #PeerContext of peer with pending liveliness check
*/
static void
mq_liveliness_check_successful (void *cls)
{
struct PeerContext *peer_ctx = cls;
if (NULL != peer_ctx->liveliness_check_pending)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Liveliness check for peer %s was successfull\n",
GNUNET_i2s (&peer_ctx->peer_id));
remove_pending_message (peer_ctx->liveliness_check_pending, GNUNET_YES);
peer_ctx->liveliness_check_pending = NULL;
set_peer_live (peer_ctx);
}
}
/**
* Issue a check whether peer is live
*
* @param peer_ctx the context of the peer
*/
static void
check_peer_live (struct PeerContext *peer_ctx)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Get informed about peer %s getting live\n",
GNUNET_i2s (&peer_ctx->peer_id));
struct GNUNET_MQ_Handle *mq;
struct GNUNET_MQ_Envelope *ev;
ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_CHECK_LIVE);
peer_ctx->liveliness_check_pending =
insert_pending_message (&peer_ctx->peer_id, ev, "Check liveliness");
mq = get_mq (&peer_ctx->peer_id);
GNUNET_MQ_notify_sent (ev,
mq_liveliness_check_successful,
peer_ctx);
GNUNET_MQ_send (mq, ev);
GNUNET_STATISTICS_update (stats,
"# pending liveliness checks",
1,
GNUNET_NO);
}
/**
* @brief Check whether function of type #PeerOp was already scheduled
*
* The array with pending operations will probably never grow really big, so
* iterating over it should be ok.
*
* @param peer the peer to check
* @param peer_op the operation (#PeerOp) on the peer
*
* @return #GNUNET_YES if this operation is scheduled on that peer
* #GNUNET_NO otherwise
*/
static int
check_operation_scheduled (const struct GNUNET_PeerIdentity *peer,
const PeerOp peer_op)
{
const struct PeerContext *peer_ctx;
unsigned int i;
peer_ctx = get_peer_ctx (peer);
for (i = 0; i < peer_ctx->num_pending_ops; i++)
if (peer_op == peer_ctx->pending_ops[i].op)
return GNUNET_YES;
return GNUNET_NO;
}
/**
* @brief Callback for scheduler to destroy a channel
*
* @param cls Context of the channel
*/
static void
destroy_channel (struct ChannelCtx *channel_ctx)
{
struct GNUNET_CADET_Channel *channel;
if (NULL != channel_ctx->destruction_task)
{
GNUNET_SCHEDULER_cancel (channel_ctx->destruction_task);
channel_ctx->destruction_task = NULL;
}
GNUNET_assert (channel_ctx->channel != NULL);
channel = channel_ctx->channel;
channel_ctx->channel = NULL;
GNUNET_CADET_channel_destroy (channel);
remove_channel_ctx (channel_ctx);
}
/**
* @brief Destroy a cadet channel.
*
* This satisfies the function signature of #GNUNET_SCHEDULER_TaskCallback.
*
* @param cls
*/
static void
destroy_channel_cb (void *cls)
{
struct ChannelCtx *channel_ctx = cls;
channel_ctx->destruction_task = NULL;
destroy_channel (channel_ctx);
}
/**
* @brief Schedule the destruction of a channel for immediately afterwards.
*
* In case a channel is to be destroyed from within the callback to the
* destruction of another channel (send channel), we cannot call
* GNUNET_CADET_channel_destroy directly, but need to use this scheduling
* construction.
*
* @param channel_ctx channel to be destroyed.
*/
static void
schedule_channel_destruction (struct ChannelCtx *channel_ctx)
{
GNUNET_assert (NULL ==
channel_ctx->destruction_task);
GNUNET_assert (NULL !=
channel_ctx->channel);
channel_ctx->destruction_task =
GNUNET_SCHEDULER_add_now (&destroy_channel_cb,
channel_ctx);
}
/**
* @brief Remove peer
*
* @param peer the peer to clean
* @return #GNUNET_YES if peer was removed
* #GNUNET_NO otherwise
*/
static int
destroy_peer (struct PeerContext *peer_ctx)
{
GNUNET_assert (NULL != peer_ctx);
GNUNET_assert (NULL != peer_map);
if (GNUNET_NO ==
GNUNET_CONTAINER_multipeermap_contains (peer_map,
&peer_ctx->peer_id))
{
return GNUNET_NO;
}
SET_PEER_FLAG (peer_ctx, Peers_TO_DESTROY);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to remove peer %s\n",
GNUNET_i2s (&peer_ctx->peer_id));
UNSET_PEER_FLAG (peer_ctx, Peers_ONLINE);
/* Clear list of pending operations */
// TODO this probably leaks memory
// ('only' the cls to the function. Not sure what to do with it)
GNUNET_array_grow (peer_ctx->pending_ops,
peer_ctx->num_pending_ops,
0);
/* Remove all pending messages */
while (NULL != peer_ctx->pending_messages_head)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Removing unsent %s\n",
peer_ctx->pending_messages_head->type);
/* Cancle pending message, too */
if ( (NULL != peer_ctx->liveliness_check_pending) &&
(0 == memcmp (peer_ctx->pending_messages_head,
peer_ctx->liveliness_check_pending,
sizeof (struct PendingMessage))) )
{
// TODO this may leak memory
peer_ctx->liveliness_check_pending = NULL;
GNUNET_STATISTICS_update (stats,
"# pending liveliness checks",
-1,
GNUNET_NO);
}
remove_pending_message (peer_ctx->pending_messages_head,
GNUNET_YES);
}
/* If we are still waiting for notification whether this peer is live
* cancel the according task */
if (NULL != peer_ctx->liveliness_check_pending)
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Removing pending liveliness check for peer %s\n",
GNUNET_i2s (&peer_ctx->peer_id));
// TODO wait until cadet sets mq->cancel_impl
//GNUNET_MQ_send_cancel (peer_ctx->liveliness_check_pending->ev);
remove_pending_message (peer_ctx->liveliness_check_pending,
GNUNET_YES);
peer_ctx->liveliness_check_pending = NULL;
}
if (NULL != peer_ctx->send_channel_ctx)
{
/* This is possibly called from within channel destruction */
peer_ctx->send_channel_ctx->peer_ctx = NULL;
schedule_channel_destruction (peer_ctx->send_channel_ctx);
peer_ctx->send_channel_ctx = NULL;
peer_ctx->mq = NULL;
}
if (NULL != peer_ctx->recv_channel_ctx)
{
/* This is possibly called from within channel destruction */
peer_ctx->recv_channel_ctx->peer_ctx = NULL;
schedule_channel_destruction (peer_ctx->recv_channel_ctx);
peer_ctx->recv_channel_ctx = NULL;
}
if (GNUNET_YES !=
GNUNET_CONTAINER_multipeermap_remove_all (peer_map,
&peer_ctx->peer_id))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"removing peer from peer_map failed\n");
}
GNUNET_free (peer_ctx);
return GNUNET_YES;
}
/**
* Iterator over hash map entries. Deletes all contexts of peers.
*
* @param cls closure
* @param key current public key
* @param value value in the hash map
* @return #GNUNET_YES if we should continue to iterate,
* #GNUNET_NO if not.
*/
static int
peermap_clear_iterator (void *cls,
const struct GNUNET_PeerIdentity *key,
void *value)
{
(void) cls;
(void) value;
destroy_peer (get_peer_ctx (key));
return GNUNET_YES;
}
/**
* @brief This is called once a message is sent.
*
* Removes the pending message
*
* @param cls type of the message that was sent
*/
static void
mq_notify_sent_cb (void *cls)
{
struct PendingMessage *pending_msg = (struct PendingMessage *) cls;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"%s was sent.\n",
pending_msg->type);
if (0 == strncmp ("PULL REPLY", pending_msg->type, 10))
GNUNET_STATISTICS_update(stats, "# pull replys sent", 1, GNUNET_NO);
if (0 == strncmp ("PULL REQUEST", pending_msg->type, 12))
GNUNET_STATISTICS_update(stats, "# pull requests sent", 1, GNUNET_NO);
if (0 == strncmp ("PUSH", pending_msg->type, 4))
GNUNET_STATISTICS_update(stats, "# pushes sent", 1, GNUNET_NO);
/* Do not cancle message */
remove_pending_message (pending_msg, GNUNET_NO);
}
/**
* @brief Iterator function for #store_valid_peers.
*
* Implements #GNUNET_CONTAINER_PeerMapIterator.
* Writes single peer to disk.
*
* @param cls the file handle to write to.
* @param peer current peer
* @param value unused
*
* @return #GNUNET_YES if we should continue to
* iterate,
* #GNUNET_NO if not.
*/
static int
store_peer_presistently_iterator (void *cls,
const struct GNUNET_PeerIdentity *peer,
void *value)
{
const struct GNUNET_DISK_FileHandle *fh = cls;
char peer_string[128];
int size;
ssize_t ret;
(void) value;
if (NULL == peer)
{
return GNUNET_YES;
}
size = GNUNET_snprintf (peer_string,
sizeof (peer_string),
"%s\n",
GNUNET_i2s_full (peer));
GNUNET_assert (53 == size);
ret = GNUNET_DISK_file_write (fh,
peer_string,
size);
GNUNET_assert (size == ret);
return GNUNET_YES;
}
/**
* @brief Store the peers currently in #valid_peers to disk.
*/
static void
store_valid_peers ()
{
struct GNUNET_DISK_FileHandle *fh;
uint32_t number_written_peers;
int ret;
if (0 == strncmp ("DISABLE", filename_valid_peers, 7))
{
return;
}
ret = GNUNET_DISK_directory_create_for_file (filename_valid_peers);
if (GNUNET_SYSERR == ret)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Not able to create directory for file `%s'\n",
filename_valid_peers);
GNUNET_break (0);
}
else if (GNUNET_NO == ret)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Directory for file `%s' exists but is not writable for us\n",
filename_valid_peers);
GNUNET_break (0);
}
fh = GNUNET_DISK_file_open (filename_valid_peers,
GNUNET_DISK_OPEN_WRITE |
GNUNET_DISK_OPEN_CREATE,
GNUNET_DISK_PERM_USER_READ |
GNUNET_DISK_PERM_USER_WRITE);
if (NULL == fh)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Not able to write valid peers to file `%s'\n",
filename_valid_peers);
return;
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Writing %u valid peers to disk\n",
GNUNET_CONTAINER_multipeermap_size (valid_peers));
number_written_peers =
GNUNET_CONTAINER_multipeermap_iterate (valid_peers,
store_peer_presistently_iterator,
fh);
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
GNUNET_assert (number_written_peers ==
GNUNET_CONTAINER_multipeermap_size (valid_peers));
}
/**
* @brief Convert string representation of peer id to peer id.
*
* Counterpart to #GNUNET_i2s_full.
*
* @param string_repr The string representation of the peer id
*
* @return The peer id
*/
static const struct GNUNET_PeerIdentity *
s2i_full (const char *string_repr)
{
struct GNUNET_PeerIdentity *peer;
size_t len;
int ret;
peer = GNUNET_new (struct GNUNET_PeerIdentity);
len = strlen (string_repr);
if (52 > len)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Not able to convert string representation of PeerID to PeerID\n"
"Sting representation: %s (len %lu) - too short\n",
string_repr,
len);
GNUNET_break (0);
}
else if (52 < len)
{
len = 52;
}
ret = GNUNET_CRYPTO_eddsa_public_key_from_string (string_repr,
len,
&peer->public_key);
if (GNUNET_OK != ret)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Not able to convert string representation of PeerID to PeerID\n"
"Sting representation: %s\n",
string_repr);
GNUNET_break (0);
}
return peer;
}
/**
* @brief Restore the peers on disk to #valid_peers.
*/
static void
restore_valid_peers ()
{
off_t file_size;
uint32_t num_peers;
struct GNUNET_DISK_FileHandle *fh;
char *buf;
ssize_t size_read;
char *iter_buf;
char *str_repr;
const struct GNUNET_PeerIdentity *peer;
if (0 == strncmp ("DISABLE", filename_valid_peers, 7))
{
return;
}
if (GNUNET_OK != GNUNET_DISK_file_test (filename_valid_peers))
{
return;
}
fh = GNUNET_DISK_file_open (filename_valid_peers,
GNUNET_DISK_OPEN_READ,
GNUNET_DISK_PERM_NONE);
GNUNET_assert (NULL != fh);
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_handle_size (fh, &file_size));
num_peers = file_size / 53;
buf = GNUNET_malloc (file_size);
size_read = GNUNET_DISK_file_read (fh, buf, file_size);
GNUNET_assert (size_read == file_size);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Restoring %" PRIu32 " peers from file `%s'\n",
num_peers,
filename_valid_peers);
for (iter_buf = buf; iter_buf < buf + file_size - 1; iter_buf += 53)
{
str_repr = GNUNET_strndup (iter_buf, 53);
peer = s2i_full (str_repr);
GNUNET_free (str_repr);
add_valid_peer (peer);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Restored valid peer %s from disk\n",
GNUNET_i2s_full (peer));
}
iter_buf = NULL;
GNUNET_free (buf);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"num_peers: %" PRIu32 ", _size (valid_peers): %u\n",
num_peers,
GNUNET_CONTAINER_multipeermap_size (valid_peers));
if (num_peers != GNUNET_CONTAINER_multipeermap_size (valid_peers))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Number of restored peers does not match file size. Have probably duplicates.\n");
}
GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Restored %u valid peers from disk\n",
GNUNET_CONTAINER_multipeermap_size (valid_peers));
}
/**
* @brief Initialise storage of peers
*
* @param fn_valid_peers filename of the file used to store valid peer ids
* @param cadet_h cadet handle
* @param own_id own peer identity
*/
static void
initialise_peers (char* fn_valid_peers,
struct GNUNET_CADET_Handle *cadet_h)
{
filename_valid_peers = GNUNET_strdup (fn_valid_peers);
cadet_handle = cadet_h;
peer_map = GNUNET_CONTAINER_multipeermap_create (4, GNUNET_NO);
valid_peers = GNUNET_CONTAINER_multipeermap_create (4, GNUNET_NO);
restore_valid_peers ();
}
/**
* @brief Delete storage of peers that was created with #initialise_peers ()
*/
static void
peers_terminate ()
{
if (GNUNET_SYSERR ==
GNUNET_CONTAINER_multipeermap_iterate (peer_map,
&peermap_clear_iterator,
NULL))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Iteration destroying peers was aborted.\n");
}
GNUNET_CONTAINER_multipeermap_destroy (peer_map);
peer_map = NULL;
store_valid_peers ();
GNUNET_free (filename_valid_peers);
filename_valid_peers = NULL;
GNUNET_CONTAINER_multipeermap_destroy (valid_peers);
valid_peers = NULL;
}
/**
* Iterator over #valid_peers hash map entries.
*
* @param cls closure - unused
* @param peer current peer id
* @param value value in the hash map - unused
* @return #GNUNET_YES if we should continue to
* iterate,
* #GNUNET_NO if not.
*/
static int
valid_peer_iterator (void *cls,
const struct GNUNET_PeerIdentity *peer,
void *value)
{
struct PeersIteratorCls *it_cls = cls;
(void) value;
return it_cls->iterator (it_cls->cls,
peer);
}
/**
* @brief Get all currently known, valid peer ids.
*
* @param it function to call on each peer id
* @param it_cls extra argument to @a it
* @return the number of key value pairs processed,
* #GNUNET_SYSERR if it aborted iteration
*/
static int
get_valid_peers (PeersIterator iterator,
void *it_cls)
{
struct PeersIteratorCls *cls;
int ret;
cls = GNUNET_new (struct PeersIteratorCls);
cls->iterator = iterator;
cls->cls = it_cls;
ret = GNUNET_CONTAINER_multipeermap_iterate (valid_peers,
valid_peer_iterator,
cls);
GNUNET_free (cls);
return ret;
}
/**
* @brief Add peer to known peers.
*
* This function is called on new peer_ids from 'external' sources
* (client seed, cadet get_peers(), ...)
*
* @param peer the new #GNUNET_PeerIdentity
*
* @return #GNUNET_YES if peer was inserted
* #GNUNET_NO otherwise
*/
static int
insert_peer (const struct GNUNET_PeerIdentity *peer)
{
if (GNUNET_YES == check_peer_known (peer))
{
return GNUNET_NO; /* We already know this peer - nothing to do */
}
(void) create_peer_ctx (peer);
return GNUNET_YES;
}
/**
* @brief Check whether flags on a peer are set.
*
* @param peer the peer to check the flag of
* @param flags the flags to check
*
* @return #GNUNET_SYSERR if peer is not known
* #GNUNET_YES if all given flags are set
* #GNUNET_NO otherwise
*/
static int
check_peer_flag (const struct GNUNET_PeerIdentity *peer,
enum Peers_PeerFlags flags)
{
struct PeerContext *peer_ctx;
if (GNUNET_NO == check_peer_known (peer))
{
return GNUNET_SYSERR;
}
peer_ctx = get_peer_ctx (peer);
return check_peer_flag_set (peer_ctx, flags);
}
/**
* @brief Try connecting to a peer to see whether it is online
*
* If not known yet, insert into known peers
*
* @param peer the peer whose liveliness is to be checked
* @return #GNUNET_YES if the check was issued
* #GNUNET_NO otherwise
*/
static int
issue_peer_liveliness_check (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
(void) insert_peer (peer);
peer_ctx = get_peer_ctx (peer);
if ( (GNUNET_NO == check_peer_flag (peer, Peers_ONLINE)) &&
(NULL == peer_ctx->liveliness_check_pending) )
{
check_peer_live (peer_ctx);
return GNUNET_YES;
}
return GNUNET_NO;
}
/**
* @brief Check if peer is removable.
*
* Check if
* - a recv channel exists
* - there are pending messages
* - there is no pending pull reply
*
* @param peer the peer in question
* @return #GNUNET_YES if peer is removable
* #GNUNET_NO if peer is NOT removable
* #GNUNET_SYSERR if peer is not known
*/
static int
check_removable (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (peer_map, peer))
{
return GNUNET_SYSERR;
}
peer_ctx = get_peer_ctx (peer);
if ( (NULL != peer_ctx->recv_channel_ctx) ||
(NULL != peer_ctx->pending_messages_head) ||
(GNUNET_NO == check_peer_flag_set (peer_ctx, Peers_PULL_REPLY_PENDING)) )
{
return GNUNET_NO;
}
return GNUNET_YES;
}
/**
* @brief Check whether @a peer is actually a peer.
*
* A valid peer is a peer that we know exists eg. we were connected to once.
*
* @param peer peer in question
*
* @return #GNUNET_YES if peer is valid
* #GNUNET_NO if peer is not valid
*/
static int
check_peer_valid (const struct GNUNET_PeerIdentity *peer)
{
return GNUNET_CONTAINER_multipeermap_contains (valid_peers, peer);
}
/**
* @brief Indicate that we want to send to the other peer
*
* This establishes a sending channel
*
* @param peer the peer to establish channel to
*/
static void
indicate_sending_intention (const struct GNUNET_PeerIdentity *peer)
{
GNUNET_assert (GNUNET_YES == check_peer_known (peer));
(void) get_channel (peer);
}
/**
* @brief Check whether other peer has the intention to send/opened channel
* towars us
*
* @param peer the peer in question
*
* @return #GNUNET_YES if peer has the intention to send
* #GNUNET_NO otherwise
*/
static int
check_peer_send_intention (const struct GNUNET_PeerIdentity *peer)
{
const struct PeerContext *peer_ctx;
peer_ctx = get_peer_ctx (peer);
if (NULL != peer_ctx->recv_channel_ctx)
{
return GNUNET_YES;
}
return GNUNET_NO;
}
/**
* Handle the channel a peer opens to us.
*
* @param cls The closure
* @param channel The channel the peer wants to establish
* @param initiator The peer's peer ID
*
* @return initial channel context for the channel
* (can be NULL -- that's not an error)
*/
static void *
handle_inbound_channel (void *cls,
struct GNUNET_CADET_Channel *channel,
const struct GNUNET_PeerIdentity *initiator)
{
struct PeerContext *peer_ctx;
struct GNUNET_PeerIdentity *ctx_peer;
struct ChannelCtx *channel_ctx;
(void) cls;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"New channel was established to us (Peer %s).\n",
GNUNET_i2s (initiator));
GNUNET_assert (NULL != channel); /* according to cadet API */
/* Make sure we 'know' about this peer */
peer_ctx = create_or_get_peer_ctx (initiator);
set_peer_live (peer_ctx);
ctx_peer = GNUNET_new (struct GNUNET_PeerIdentity);
*ctx_peer = *initiator;
channel_ctx = add_channel_ctx (peer_ctx);
channel_ctx->channel = channel;
/* We only accept one incoming channel per peer */
if (GNUNET_YES == check_peer_send_intention (initiator))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Already got one receive channel. Destroying old one.\n");
GNUNET_break_op (0);
destroy_channel (peer_ctx->recv_channel_ctx);
peer_ctx->recv_channel_ctx = channel_ctx;
/* return the channel context */
return channel_ctx;
}
peer_ctx->recv_channel_ctx = channel_ctx;
return channel_ctx;
}
/**
* @brief Check whether a sending channel towards the given peer exists
*
* @param peer the peer to check for
*
* @return #GNUNET_YES if a sending channel towards that peer exists
* #GNUNET_NO otherwise
*/
static int
check_sending_channel_exists (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
if (GNUNET_NO == check_peer_known (peer))
{ /* If no such peer exists, there is no channel */
return GNUNET_NO;
}
peer_ctx = get_peer_ctx (peer);
if (NULL == peer_ctx->send_channel_ctx)
{
return GNUNET_NO;
}
return GNUNET_YES;
}
/**
* @brief Destroy the send channel of a peer e.g. stop indicating a sending
* intention to another peer
*
* If there is also no channel to receive messages from that peer, remove it
* from the peermap.
* TODO really?
*
* @peer the peer identity of the peer whose sending channel to destroy
* @return #GNUNET_YES if channel was destroyed
* #GNUNET_NO otherwise
*/
static int
destroy_sending_channel (const struct GNUNET_PeerIdentity *peer)
{
struct PeerContext *peer_ctx;
if (GNUNET_NO == check_peer_known (peer))
{
return GNUNET_NO;
}
peer_ctx = get_peer_ctx (peer);
if (NULL != peer_ctx->send_channel_ctx)
{
destroy_channel (peer_ctx->send_channel_ctx);
(void) check_connected (peer);
return GNUNET_YES;
}
return GNUNET_NO;
}
/**
* @brief Send a message to another peer.
*
* Keeps track about pending messages so they can be properly removed when the
* peer is destroyed.
*
* @param peer receeiver of the message
* @param ev envelope of the message
* @param type type of the message
*/
static void
send_message (const struct GNUNET_PeerIdentity *peer,
struct GNUNET_MQ_Envelope *ev,
const char *type)
{
struct PendingMessage *pending_msg;
struct GNUNET_MQ_Handle *mq;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Sending message to %s of type %s\n",
GNUNET_i2s (peer),
type);
pending_msg = insert_pending_message (peer, ev, type);
mq = get_mq (peer);
GNUNET_MQ_notify_sent (ev,
mq_notify_sent_cb,
pending_msg);
GNUNET_MQ_send (mq, ev);
}
/**
* @brief Schedule a operation on given peer
*
* Avoids scheduling an operation twice.
*
* @param peer the peer we want to schedule the operation for once it gets live
*
* @return #GNUNET_YES if the operation was scheduled
* #GNUNET_NO otherwise
*/
static int
schedule_operation (const struct GNUNET_PeerIdentity *peer,
const PeerOp peer_op)
{
struct PeerPendingOp pending_op;
struct PeerContext *peer_ctx;
GNUNET_assert (GNUNET_YES == check_peer_known (peer));
//TODO if LIVE/ONLINE execute immediately
if (GNUNET_NO == check_operation_scheduled (peer, peer_op))
{
peer_ctx = get_peer_ctx (peer);
pending_op.op = peer_op;
pending_op.op_cls = NULL;
GNUNET_array_append (peer_ctx->pending_ops,
peer_ctx->num_pending_ops,
pending_op);
return GNUNET_YES;
}
return GNUNET_NO;
}
/***********************************************************************
* /Old gnunet-service-rps_peers.c
***********************************************************************/
/***********************************************************************
* Housekeeping with clients
***********************************************************************/
/**
* Closure used to pass the client and the id to the callback
* that replies to a client's request
*/
struct ReplyCls
{
/**
* DLL
*/
struct ReplyCls *next;
struct ReplyCls *prev;
/**
* The identifier of the request
*/
uint32_t id;
/**
* The handle to the request
*/
struct RPS_SamplerRequestHandle *req_handle;
/**
* The client handle to send the reply to
*/
struct ClientContext *cli_ctx;
};
/**
* Struct used to store the context of a connected client.
*/
struct ClientContext
{
/**
* DLL
*/
struct ClientContext *next;
struct ClientContext *prev;
/**
* The message queue to communicate with the client.
*/
struct GNUNET_MQ_Handle *mq;
/**
* DLL with handles to single requests from the client
*/
struct ReplyCls *rep_cls_head;
struct ReplyCls *rep_cls_tail;
/**
* @brief How many updates this client expects to receive.
*/
int64_t view_updates_left;
/**
* The client handle to send the reply to
*/
struct GNUNET_SERVICE_Client *client;
};
/**
* DLL with all clients currently connected to us
*/
struct ClientContext *cli_ctx_head;
struct ClientContext *cli_ctx_tail;
/***********************************************************************
* /Housekeeping with clients
***********************************************************************/
/***********************************************************************
* Globals
***********************************************************************/
/**
* Sampler used for the Brahms protocol itself.
*/
static struct RPS_Sampler *prot_sampler;
/**
* Sampler used for the clients.
*/
static struct RPS_Sampler *client_sampler;
/**
* Name to log view to
*/
static const char *file_name_view_log;
#ifdef TO_FILE
/**
* Name to log number of observed peers to
*/
static const char *file_name_observed_log;
/**
* @brief Count the observed peers
*/
static uint32_t num_observed_peers;
/**
* @brief Multipeermap (ab-) used to count unique peer_ids
*/
static struct GNUNET_CONTAINER_MultiPeerMap *observed_unique_peers;
#endif /* TO_FILE */
/**
* The size of sampler we need to be able to satisfy the client's need
* of random peers.
*/
static unsigned int sampler_size_client_need;
/**
* The size of sampler we need to be able to satisfy the Brahms protocol's
* need of random peers.
*
* This is one minimum size the sampler grows to.
*/
static unsigned int sampler_size_est_need;
/**
* @brief This is the minimum estimate used as sampler size.
*
* It is configured by the user.
*/
static unsigned int sampler_size_est_min;
/**
* @brief This is the estimate used as view size.
*
* It is initialised with the minimum
*/
static unsigned int view_size_est_need;
/**
* @brief This is the minimum estimate used as view size.
*
* It is configured by the user.
*/
static unsigned int view_size_est_min;
/**
* Percentage of total peer number in the view
* to send random PUSHes to
*/
static float alpha;
/**
* Percentage of total peer number in the view
* to send random PULLs to
*/
static float beta;
/**
* Identifier for the main task that runs periodically.
*/
static struct GNUNET_SCHEDULER_Task *do_round_task;
/**
* Time inverval the do_round task runs in.
*/
static struct GNUNET_TIME_Relative round_interval;
/**
* List to store peers received through pushes temporary.
*/
static struct CustomPeerMap *push_map;
/**
* List to store peers received through pulls temporary.
*/
static struct CustomPeerMap *pull_map;
/**
* Handler to NSE.
*/
static struct GNUNET_NSE_Handle *nse;
/**
* Handler to CADET.
*/
static struct GNUNET_CADET_Handle *cadet_handle;
/**
* @brief Port to communicate to other peers.
*/
static struct GNUNET_CADET_Port *cadet_port;
/**
* Handler to PEERINFO.
*/
static struct GNUNET_PEERINFO_Handle *peerinfo_handle;
/**
* Handle for cancellation of iteration over peers.
*/
static struct GNUNET_PEERINFO_NotifyContext *peerinfo_notify_handle;
/**
* Request counter.
*
* Counts how many requets clients already issued.
* Only needed in the beginning to check how many of the 64 deltas
* we already have
*/
static unsigned int req_counter;
/**
* Time of the last request we received.
*
* Used to compute the expected request rate.
*/
static struct GNUNET_TIME_Absolute last_request;
/**
* Size of #request_deltas.
*/
#define REQUEST_DELTAS_SIZE 64
static unsigned int request_deltas_size = REQUEST_DELTAS_SIZE;
/**
* Last 64 deltas between requests
*/
static struct GNUNET_TIME_Relative request_deltas[REQUEST_DELTAS_SIZE];
/**
* The prediction of the rate of requests
*/
static struct GNUNET_TIME_Relative request_rate;
#ifdef ENABLE_MALICIOUS
/**
* Type of malicious peer
*
* 0 Don't act malicious at all - Default
* 1 Try to maximise representation
* 2 Try to partition the network
* 3 Combined attack
*/
static uint32_t mal_type;
/**
* Other malicious peers
*/
static struct GNUNET_PeerIdentity *mal_peers;
/**
* Hashmap of malicious peers used as set.
* Used to more efficiently check whether we know that peer.
*/
static struct GNUNET_CONTAINER_MultiPeerMap *mal_peer_set;
/**
* Number of other malicious peers
*/
static uint32_t num_mal_peers;
/**
* If type is 2 This struct is used to store the attacked peers in a DLL
*/
struct AttackedPeer
{
/**
* DLL
*/
struct AttackedPeer *next;
struct AttackedPeer *prev;
/**
* PeerID
*/
struct GNUNET_PeerIdentity peer_id;
};
/**
* If type is 2 this is the DLL of attacked peers
*/
static struct AttackedPeer *att_peers_head;
static struct AttackedPeer *att_peers_tail;
/**
* This index is used to point to an attacked peer to
* implement the round-robin-ish way to select attacked peers.
*/
static struct AttackedPeer *att_peer_index;
/**
* Hashmap of attacked peers used as set.
* Used to more efficiently check whether we know that peer.
*/
static struct GNUNET_CONTAINER_MultiPeerMap *att_peer_set;
/**
* Number of attacked peers
*/
static uint32_t num_attacked_peers;
/**
* If type is 1 this is the attacked peer
*/
static struct GNUNET_PeerIdentity attacked_peer;
/**
* The limit of PUSHes we can send in one round.
* This is an assumption of the Brahms protocol and either implemented
* via proof of work
* or
* assumend to be the bandwidth limitation.
*/
static uint32_t push_limit = 10000;
#endif /* ENABLE_MALICIOUS */
/***********************************************************************
* /Globals
***********************************************************************/
/***********************************************************************
* Util functions
***********************************************************************/
/**
* Print peerlist to log.
*/
static void
print_peer_list (struct GNUNET_PeerIdentity *list,
unsigned int len)
{
unsigned int i;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Printing peer list of length %u at %p:\n",
len,
list);
for (i = 0 ; i < len ; i++)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"%u. peer: %s\n",
i, GNUNET_i2s (&list[i]));
}
}
/**
* Remove peer from list.
*/
static void
rem_from_list (struct GNUNET_PeerIdentity **peer_list,
unsigned int *list_size,
const struct GNUNET_PeerIdentity *peer)
{
unsigned int i;
struct GNUNET_PeerIdentity *tmp;
tmp = *peer_list;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Removing peer %s from list at %p\n",
GNUNET_i2s (peer),
tmp);
for ( i = 0 ; i < *list_size ; i++ )
{
if (0 == GNUNET_CRYPTO_cmp_peer_identity (&tmp[i], peer))
{
if (i < *list_size -1)
{ /* Not at the last entry -- shift peers left */
memmove (&tmp[i], &tmp[i +1],
((*list_size) - i -1) * sizeof (struct GNUNET_PeerIdentity));
}
/* Remove last entry (should be now useless PeerID) */
GNUNET_array_grow (tmp, *list_size, (*list_size) -1);
}
}
*peer_list = tmp;
}
/**
* Sum all time relatives of an array.
*/
static struct GNUNET_TIME_Relative
T_relative_sum (const struct GNUNET_TIME_Relative *rel_array,
uint32_t arr_size)
{
struct GNUNET_TIME_Relative sum;
uint32_t i;
sum = GNUNET_TIME_UNIT_ZERO;
for ( i = 0 ; i < arr_size ; i++ )
{
sum = GNUNET_TIME_relative_add (sum, rel_array[i]);
}
return sum;
}
/**
* Compute the average of given time relatives.
*/
static struct GNUNET_TIME_Relative
T_relative_avg (const struct GNUNET_TIME_Relative *rel_array,
uint32_t arr_size)
{
return GNUNET_TIME_relative_divide (T_relative_sum (rel_array,
arr_size),
arr_size);
}
/**
* Insert PeerID in #view
*
* Called once we know a peer is live.
* Implements #PeerOp
*
* @return GNUNET_OK if peer was actually inserted
* GNUNET_NO if peer was not inserted
*/
static void
insert_in_view_op (void *cls,
const struct GNUNET_PeerIdentity *peer);
/**
* Insert PeerID in #view
*
* Called once we know a peer is live.
*
* @return GNUNET_OK if peer was actually inserted
* GNUNET_NO if peer was not inserted
*/
static int
insert_in_view (const struct GNUNET_PeerIdentity *peer)
{
int online;
int ret;
online = check_peer_flag (peer, Peers_ONLINE);
if ( (GNUNET_NO == online) ||
(GNUNET_SYSERR == online) ) /* peer is not even known */
{
(void) issue_peer_liveliness_check (peer);
(void) schedule_operation (peer, insert_in_view_op);
return GNUNET_NO;
}
/* Open channel towards peer to keep connection open */
indicate_sending_intention (peer);
ret = View_put (peer);
GNUNET_STATISTICS_set (stats, "view size", View_size(), GNUNET_NO);
return ret;
}
/**
* @brief sends updates to clients that are interested
*/
static void
clients_notify_view_update (void);
/**
* Put random peer from sampler into the view as history update.
*/
static void
hist_update (void *cls,
struct GNUNET_PeerIdentity *ids,
uint32_t num_peers)
{
unsigned int i;
(void) cls;
for (i = 0; i < num_peers; i++)
{
(void) insert_in_view (&ids[i]);
to_file (file_name_view_log,
"+%s\t(hist)",
GNUNET_i2s_full (ids));
}
clients_notify_view_update();
}
/**
* Wrapper around #RPS_sampler_resize()
*
* If we do not have enough sampler elements, double current sampler size
* If we have more than enough sampler elements, halv current sampler size
*/
static void
resize_wrapper (struct RPS_Sampler *sampler, uint32_t new_size)
{
unsigned int sampler_size;
// TODO statistics
// TODO respect the min, max
sampler_size = RPS_sampler_get_size (sampler);
if (sampler_size > new_size * 4)
{ /* Shrinking */
RPS_sampler_resize (sampler, sampler_size / 2);
}
else if (sampler_size < new_size)
{ /* Growing */
RPS_sampler_resize (sampler, sampler_size * 2);
}
LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler_size is now %u\n", sampler_size);
}
/**
* Wrapper around #RPS_sampler_resize() resizing the client sampler
*/
static void
client_resize_wrapper ()
{
uint32_t bigger_size;
// TODO statistics
bigger_size = GNUNET_MAX (sampler_size_est_need, sampler_size_client_need);
// TODO respect the min, max
resize_wrapper (client_sampler, bigger_size);
LOG (GNUNET_ERROR_TYPE_DEBUG, "sampler_size_client is now %" PRIu32 "\n",
bigger_size);
}
/**
* Estimate request rate
*
* Called every time we receive a request from the client.
*/
static void
est_request_rate()
{
struct GNUNET_TIME_Relative max_round_duration;
if (request_deltas_size > req_counter)
req_counter++;
if ( 1 < req_counter)
{
/* Shift last request deltas to the right */
memmove (&request_deltas[1],
request_deltas,
(req_counter - 1) * sizeof (struct GNUNET_TIME_Relative));
/* Add current delta to beginning */
request_deltas[0] =
GNUNET_TIME_absolute_get_difference (last_request,
GNUNET_TIME_absolute_get ());
request_rate = T_relative_avg (request_deltas, req_counter);
request_rate = (request_rate.rel_value_us < 1) ?
GNUNET_TIME_relative_get_unit_ () : request_rate;
/* Compute the duration a round will maximally take */
max_round_duration =
GNUNET_TIME_relative_add (round_interval,
GNUNET_TIME_relative_divide (round_interval, 2));
/* Set the estimated size the sampler has to have to
* satisfy the current client request rate */
sampler_size_client_need =
max_round_duration.rel_value_us / request_rate.rel_value_us;
/* Resize the sampler */
client_resize_wrapper ();
}
last_request = GNUNET_TIME_absolute_get ();
}
/**
* Add all peers in @a peer_array to @a peer_map used as set.
*
* @param peer_array array containing the peers
* @param num_peers number of peers in @peer_array
* @param peer_map the peermap to use as set
*/
static void
add_peer_array_to_set (const struct GNUNET_PeerIdentity *peer_array,
unsigned int num_peers,
struct GNUNET_CONTAINER_MultiPeerMap *peer_map)
{
unsigned int i;
if (NULL == peer_map)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Trying to add peers to non-existing peermap.\n");
return;
}
for (i = 0; i < num_peers; i++)
{
GNUNET_CONTAINER_multipeermap_put (peer_map,
&peer_array[i],
NULL,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
}
}
/**
* Send a PULL REPLY to @a peer_id
*
* @param peer_id the peer to send the reply to.
* @param peer_ids the peers to send to @a peer_id
* @param num_peer_ids the number of peers to send to @a peer_id
*/
static void
send_pull_reply (const struct GNUNET_PeerIdentity *peer_id,
const struct GNUNET_PeerIdentity *peer_ids,
unsigned int num_peer_ids)
{
uint32_t send_size;
struct GNUNET_MQ_Envelope *ev;
struct GNUNET_RPS_P2P_PullReplyMessage *out_msg;
/* Compute actual size */
send_size = sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) +
num_peer_ids * sizeof (struct GNUNET_PeerIdentity);
if (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < send_size)
/* Compute number of peers to send
* If too long, simply truncate */
// TODO select random ones via permutation
// or even better: do good protocol design
send_size =
(GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE -
sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
sizeof (struct GNUNET_PeerIdentity);
else
send_size = num_peer_ids;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send PULL REPLY with %u peers to %s\n",
send_size, GNUNET_i2s (peer_id));
ev = GNUNET_MQ_msg_extra (out_msg,
send_size * sizeof (struct GNUNET_PeerIdentity),
GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY);
out_msg->num_peers = htonl (send_size);
GNUNET_memcpy (&out_msg[1], peer_ids,
send_size * sizeof (struct GNUNET_PeerIdentity));
send_message (peer_id, ev, "PULL REPLY");
GNUNET_STATISTICS_update(stats, "# pull reply send issued", 1, GNUNET_NO);
// TODO check with send intention: as send_channel is used/opened we indicate
// a sending intention without intending it.
// -> clean peer afterwards?
// -> use recv_channel?
}
/**
* Insert PeerID in #pull_map
*
* Called once we know a peer is live.
*/
static void
insert_in_pull_map (void *cls,
const struct GNUNET_PeerIdentity *peer)
{
(void) cls;
CustomPeerMap_put (pull_map, peer);
}
/**
* Insert PeerID in #view
*
* Called once we know a peer is live.
* Implements #PeerOp
*/
static void
insert_in_view_op (void *cls,
const struct GNUNET_PeerIdentity *peer)
{
(void) cls;
(void) insert_in_view (peer);
}
/**
* Update sampler with given PeerID.
* Implements #PeerOp
*/
static void
insert_in_sampler (void *cls,
const struct GNUNET_PeerIdentity *peer)
{
(void) cls;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Updating samplers with peer %s from insert_in_sampler()\n",
GNUNET_i2s (peer));
RPS_sampler_update (prot_sampler, peer);
RPS_sampler_update (client_sampler, peer);
if (0 < RPS_sampler_count_id (prot_sampler, peer))
{
/* Make sure we 'know' about this peer */
(void) issue_peer_liveliness_check (peer);
/* Establish a channel towards that peer to indicate we are going to send
* messages to it */
//indicate_sending_intention (peer);
}
#ifdef TO_FILE
num_observed_peers++;
GNUNET_CONTAINER_multipeermap_put
(observed_unique_peers,
peer,
NULL,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
uint32_t num_observed_unique_peers = GNUNET_CONTAINER_multipeermap_size (
observed_unique_peers);
to_file (file_name_observed_log,
"%" PRIu32 " %" PRIu32 " %f\n",
num_observed_peers,
num_observed_unique_peers,
1.0*num_observed_unique_peers/num_observed_peers)
#endif /* TO_FILE */
}
/**
* @brief This is called on peers from external sources (cadet, peerinfo, ...)
* If the peer is not known, liveliness check is issued and it is
* scheduled to be inserted in sampler and view.
*
* "External sources" refer to every source except the gossip.
*
* @param peer peer to insert
*/
static void
got_peer (const struct GNUNET_PeerIdentity *peer)
{
/* If we did not know this peer already, insert it into sampler and view */
if (GNUNET_YES == issue_peer_liveliness_check (peer))
{
schedule_operation (peer, insert_in_sampler);
schedule_operation (peer, insert_in_view_op);
}
GNUNET_STATISTICS_update (stats,
"# learnd peers",
1,
GNUNET_NO);
}
/**
* @brief Checks if there is a sending channel and if it is needed
*
* @param peer the peer whose sending channel is checked
* @return GNUNET_YES if sending channel exists and is still needed
* GNUNET_NO otherwise
*/
static int
check_sending_channel_needed (const struct GNUNET_PeerIdentity *peer)
{
/* struct GNUNET_CADET_Channel *channel; */
if (GNUNET_NO == check_peer_known (peer))
{
return GNUNET_NO;
}
if (GNUNET_YES == check_sending_channel_exists (peer))
{
if ( (0 < RPS_sampler_count_id (prot_sampler, peer)) ||
(GNUNET_YES == View_contains_peer (peer)) ||
(GNUNET_YES == CustomPeerMap_contains_peer (push_map, peer)) ||
(GNUNET_YES == CustomPeerMap_contains_peer (pull_map, peer)) ||
(GNUNET_YES == check_peer_flag (peer, Peers_PULL_REPLY_PENDING)))
{ /* If we want to keep the connection to peer open */
return GNUNET_YES;
}
return GNUNET_NO;
}
return GNUNET_NO;
}
/**
* @brief remove peer from our knowledge, the view, push and pull maps and
* samplers.
*
* @param peer the peer to remove
*/
static void
remove_peer (const struct GNUNET_PeerIdentity *peer)
{
(void) View_remove_peer (peer);
CustomPeerMap_remove_peer (pull_map, peer);
CustomPeerMap_remove_peer (push_map, peer);
RPS_sampler_reinitialise_by_value (prot_sampler, peer);
RPS_sampler_reinitialise_by_value (client_sampler, peer);
destroy_peer (get_peer_ctx (peer));
}
/**
* @brief Remove data that is not needed anymore.
*
* If the sending channel is no longer needed it is destroyed.
*
* @param peer the peer whose data is about to be cleaned
*/
static void
clean_peer (const struct GNUNET_PeerIdentity *peer)
{
if (GNUNET_NO == check_sending_channel_needed (peer))
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to remove send channel to peer %s\n",
GNUNET_i2s (peer));
#ifdef ENABLE_MALICIOUS
if (0 != GNUNET_CRYPTO_cmp_peer_identity (&attacked_peer, peer))
(void) destroy_sending_channel (peer);
#else /* ENABLE_MALICIOUS */
(void) destroy_sending_channel (peer);
#endif /* ENABLE_MALICIOUS */
}
if ( (GNUNET_NO == check_peer_send_intention (peer)) &&
(GNUNET_NO == View_contains_peer (peer)) &&
(GNUNET_NO == CustomPeerMap_contains_peer (push_map, peer)) &&
(GNUNET_NO == CustomPeerMap_contains_peer (push_map, peer)) &&
(0 == RPS_sampler_count_id (prot_sampler, peer)) &&
(0 == RPS_sampler_count_id (client_sampler, peer)) &&
(GNUNET_NO != check_removable (peer)) )
{ /* We can safely remove this peer */
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to remove peer %s\n",
GNUNET_i2s (peer));
remove_peer (peer);
return;
}
}
/**
* @brief This is called when a channel is destroyed.
*
* Removes peer completely from our knowledge if the send_channel was destroyed
* Otherwise simply delete the recv_channel
* Also check if the knowledge about this peer is still needed.
* If not, remove this peer from our knowledge.
*
* @param cls The closure
* @param channel The channel being closed
* @param channel_ctx The context associated with this channel
*/
static void
cleanup_destroyed_channel (void *cls,
const struct GNUNET_CADET_Channel *channel)
{
struct ChannelCtx *channel_ctx = cls;
struct PeerContext *peer_ctx = channel_ctx->peer_ctx;
(void) cls;
(void) channel;
channel_ctx->channel = NULL;
remove_channel_ctx (channel_ctx);
if (NULL != peer_ctx &&
peer_ctx->send_channel_ctx == channel_ctx)
{
remove_peer (&peer_ctx->peer_id);
}
}
/***********************************************************************
* /Util functions
***********************************************************************/
static void
destroy_reply_cls (struct ReplyCls *rep_cls)
{
struct ClientContext *cli_ctx;
cli_ctx = rep_cls->cli_ctx;
GNUNET_assert (NULL != cli_ctx);
if (NULL != rep_cls->req_handle)
{
RPS_sampler_request_cancel (rep_cls->req_handle);
}
GNUNET_CONTAINER_DLL_remove (cli_ctx->rep_cls_head,
cli_ctx->rep_cls_tail,
rep_cls);
GNUNET_free (rep_cls);
}
static void
destroy_cli_ctx (struct ClientContext *cli_ctx)
{
GNUNET_assert (NULL != cli_ctx);
if (NULL != cli_ctx->rep_cls_head)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Trying to destroy the context of a client that still has pending requests. Going to clean those\n");
while (NULL != cli_ctx->rep_cls_head)
destroy_reply_cls (cli_ctx->rep_cls_head);
}
GNUNET_CONTAINER_DLL_remove (cli_ctx_head,
cli_ctx_tail,
cli_ctx);
GNUNET_free (cli_ctx);
}
/**
* Function called by NSE.
*
* Updates sizes of sampler list and view and adapt those lists
* accordingly.
*/
static void
nse_callback (void *cls,
struct GNUNET_TIME_Absolute timestamp,
double logestimate, double std_dev)
{
double estimate;
//double scale; // TODO this might go gloabal/config
(void) cls;
(void) timestamp;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Received a ns estimate - logest: %f, std_dev: %f (old_size: %u)\n",
logestimate, std_dev, RPS_sampler_get_size (prot_sampler));
//scale = .01;
estimate = GNUNET_NSE_log_estimate_to_n (logestimate);
// GNUNET_NSE_log_estimate_to_n (logestimate);
estimate = pow (estimate, 1.0 / 3);
// TODO add if std_dev is a number
// estimate += (std_dev * scale);
if (view_size_est_min < ceil (estimate))
{
LOG (GNUNET_ERROR_TYPE_DEBUG, "Changing estimate to %f\n", estimate);
sampler_size_est_need = estimate;
view_size_est_need = estimate;
} else
{
LOG (GNUNET_ERROR_TYPE_DEBUG, "Not using estimate %f\n", estimate);
//sampler_size_est_need = view_size_est_min;
view_size_est_need = view_size_est_min;
}
GNUNET_STATISTICS_set (stats, "view size aim", view_size_est_need, GNUNET_NO);
/* If the NSE has changed adapt the lists accordingly */
resize_wrapper (prot_sampler, sampler_size_est_need);
client_resize_wrapper ();
View_change_len (view_size_est_need);
}
/**
* Callback called once the requested PeerIDs are ready.
*
* Sends those to the requesting client.
*/
static void
client_respond (void *cls,
struct GNUNET_PeerIdentity *peer_ids,
uint32_t num_peers)
{
struct ReplyCls *reply_cls = cls;
uint32_t i;
struct GNUNET_MQ_Envelope *ev;
struct GNUNET_RPS_CS_ReplyMessage *out_msg;
uint32_t size_needed;
struct ClientContext *cli_ctx;
GNUNET_assert (NULL != reply_cls);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"sampler returned %" PRIu32 " peers:\n",
num_peers);
for (i = 0; i < num_peers; i++)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
" %" PRIu32 ": %s\n",
i,
GNUNET_i2s (&peer_ids[i]));
}
size_needed = sizeof (struct GNUNET_RPS_CS_ReplyMessage) +
num_peers * sizeof (struct GNUNET_PeerIdentity);
GNUNET_assert (GNUNET_MAX_MESSAGE_SIZE >= size_needed);
ev = GNUNET_MQ_msg_extra (out_msg,
num_peers * sizeof (struct GNUNET_PeerIdentity),
GNUNET_MESSAGE_TYPE_RPS_CS_REPLY);
out_msg->num_peers = htonl (num_peers);
out_msg->id = htonl (reply_cls->id);
GNUNET_memcpy (&out_msg[1],
peer_ids,
num_peers * sizeof (struct GNUNET_PeerIdentity));
cli_ctx = reply_cls->cli_ctx;
GNUNET_assert (NULL != cli_ctx);
reply_cls->req_handle = NULL;
destroy_reply_cls (reply_cls);
GNUNET_MQ_send (cli_ctx->mq, ev);
}
/**
* Handle RPS request from the client.
*
* @param cls closure
* @param message the actual message
*/
static void
handle_client_request (void *cls,
const struct GNUNET_RPS_CS_RequestMessage *msg)
{
struct ClientContext *cli_ctx = cls;
uint32_t num_peers;
uint32_t size_needed;
struct ReplyCls *reply_cls;
uint32_t i;
num_peers = ntohl (msg->num_peers);
size_needed = sizeof (struct GNUNET_RPS_CS_RequestMessage) +
num_peers * sizeof (struct GNUNET_PeerIdentity);
if (GNUNET_MAX_MESSAGE_SIZE < size_needed)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Message received from client has size larger than expected\n");
GNUNET_SERVICE_client_drop (cli_ctx->client);
return;
}
for (i = 0 ; i < num_peers ; i++)
est_request_rate();
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Client requested %" PRIu32 " random peer(s).\n",
num_peers);
reply_cls = GNUNET_new (struct ReplyCls);
reply_cls->id = ntohl (msg->id);
reply_cls->cli_ctx = cli_ctx;
reply_cls->req_handle = RPS_sampler_get_n_rand_peers (client_sampler,
client_respond,
reply_cls,
num_peers);
GNUNET_assert (NULL != cli_ctx);
GNUNET_CONTAINER_DLL_insert (cli_ctx->rep_cls_head,
cli_ctx->rep_cls_tail,
reply_cls);
GNUNET_SERVICE_client_continue (cli_ctx->client);
}
/**
* @brief Handle a message that requests the cancellation of a request
*
* @param cls unused
* @param message the message containing the id of the request
*/
static void
handle_client_request_cancel (void *cls,
const struct GNUNET_RPS_CS_RequestCancelMessage *msg)
{
struct ClientContext *cli_ctx = cls;
struct ReplyCls *rep_cls;
GNUNET_assert (NULL != cli_ctx);
GNUNET_assert (NULL != cli_ctx->rep_cls_head);
rep_cls = cli_ctx->rep_cls_head;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Client cancels request with id %" PRIu32 "\n",
ntohl (msg->id));
while ( (NULL != rep_cls->next) &&
(rep_cls->id != ntohl (msg->id)) )
rep_cls = rep_cls->next;
GNUNET_assert (rep_cls->id == ntohl (msg->id));
destroy_reply_cls (rep_cls);
GNUNET_SERVICE_client_continue (cli_ctx->client);
}
/**
* @brief This function is called, when the client seeds peers.
* It verifies that @a msg is well-formed.
*
* @param cls the closure (#ClientContext)
* @param msg the message
* @return #GNUNET_OK if @a msg is well-formed
*/
static int
check_client_seed (void *cls, const struct GNUNET_RPS_CS_SeedMessage *msg)
{
struct ClientContext *cli_ctx = cls;
uint16_t msize = ntohs (msg->header.size);
uint32_t num_peers = ntohl (msg->num_peers);
msize -= sizeof (struct GNUNET_RPS_CS_SeedMessage);
if ( (msize / sizeof (struct GNUNET_PeerIdentity) != num_peers) ||
(msize % sizeof (struct GNUNET_PeerIdentity) != 0) )
{
GNUNET_break (0);
GNUNET_SERVICE_client_drop (cli_ctx->client);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Handle seed from the client.
*
* @param cls closure
* @param message the actual message
*/
static void
handle_client_seed (void *cls,
const struct GNUNET_RPS_CS_SeedMessage *msg)
{
struct ClientContext *cli_ctx = cls;
struct GNUNET_PeerIdentity *peers;
uint32_t num_peers;
uint32_t i;
num_peers = ntohl (msg->num_peers);
peers = (struct GNUNET_PeerIdentity *) &msg[1];
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Client seeded peers:\n");
print_peer_list (peers, num_peers);
for (i = 0; i < num_peers; i++)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Updating samplers with seed %" PRIu32 ": %s\n",
i,
GNUNET_i2s (&peers[i]));
got_peer (&peers[i]);
}
GNUNET_SERVICE_client_continue (cli_ctx->client);
}
/**
* @brief Send view to client
*
* @param cli_ctx the context of the client
* @param view_array the peerids of the view as array (can be empty)
* @param view_size the size of the view array (can be 0)
*/
void
send_view (const struct ClientContext *cli_ctx,
const struct GNUNET_PeerIdentity *view_array,
uint64_t view_size)
{
struct GNUNET_MQ_Envelope *ev;
struct GNUNET_RPS_CS_DEBUG_ViewReply *out_msg;
if (NULL == view_array)
{
view_size = View_size ();
view_array = View_get_as_array();
}
ev = GNUNET_MQ_msg_extra (out_msg,
view_size * sizeof (struct GNUNET_PeerIdentity),
GNUNET_MESSAGE_TYPE_RPS_CS_DEBUG_VIEW_REPLY);
out_msg->num_peers = htonl (view_size);
GNUNET_memcpy (&out_msg[1],
view_array,
view_size * sizeof (struct GNUNET_PeerIdentity));
GNUNET_MQ_send (cli_ctx->mq, ev);
}
/**
* @brief sends updates to clients that are interested
*/
static void
clients_notify_view_update (void)
{
struct ClientContext *cli_ctx_iter;
uint64_t num_peers;
const struct GNUNET_PeerIdentity *view_array;
num_peers = View_size ();
view_array = View_get_as_array();
/* check size of view is small enough */
if (GNUNET_MAX_MESSAGE_SIZE < num_peers)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"View is too big to send\n");
return;
}
for (cli_ctx_iter = cli_ctx_head;
NULL != cli_ctx_iter;
cli_ctx_iter = cli_ctx_head->next)
{
if (1 < cli_ctx_iter->view_updates_left)
{
/* Client wants to receive limited amount of updates */
cli_ctx_iter->view_updates_left -= 1;
} else if (1 == cli_ctx_iter->view_updates_left)
{
/* Last update of view for client */
cli_ctx_iter->view_updates_left = -1;
} else if (0 > cli_ctx_iter->view_updates_left) {
/* Client is not interested in updates */
continue;
}
/* else _updates_left == 0 - infinite amount of updates */
/* send view */
send_view (cli_ctx_iter, view_array, num_peers);
}
}
/**
* Handle RPS request from the client.
*
* @param cls closure
* @param message the actual message
*/
static void
handle_client_view_request (void *cls,
const struct GNUNET_RPS_CS_DEBUG_ViewRequest *msg)
{
struct ClientContext *cli_ctx = cls;
uint64_t num_updates;
num_updates = ntohl (msg->num_updates);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Client requested %" PRIu64 " updates of view.\n",
num_updates);
GNUNET_assert (NULL != cli_ctx);
cli_ctx->view_updates_left = num_updates;
send_view (cli_ctx, NULL, 0);
GNUNET_SERVICE_client_continue (cli_ctx->client);
}
/**
* Handle a CHECK_LIVE message from another peer.
*
* This does nothing. But without calling #GNUNET_CADET_receive_done()
* the channel is blocked for all other communication.
*
* @param cls Closure
* @param msg The message header
*/
static void
handle_peer_check (void *cls,
const struct GNUNET_MessageHeader *msg)
{
const struct ChannelCtx *channel_ctx = cls;
const struct GNUNET_PeerIdentity *peer = &channel_ctx->peer_ctx->peer_id;
(void) msg;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Received CHECK_LIVE (%s)\n", GNUNET_i2s (peer));
GNUNET_STATISTICS_update (stats,
"# pending liveliness checks",
-1,
GNUNET_NO);
GNUNET_CADET_receive_done (channel_ctx->channel);
}
/**
* Handle a PUSH message from another peer.
*
* Check the proof of work and store the PeerID
* in the temporary list for pushed PeerIDs.
*
* @param cls Closure
* @param msg The message header
*/
static void
handle_peer_push (void *cls,
const struct GNUNET_MessageHeader *msg)
{
const struct ChannelCtx *channel_ctx = cls;
const struct GNUNET_PeerIdentity *peer = &channel_ctx->peer_ctx->peer_id;
(void) msg;
// (check the proof of work (?))
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Received PUSH (%s)\n",
GNUNET_i2s (peer));
GNUNET_STATISTICS_update(stats, "# push message received", 1, GNUNET_NO);
#ifdef ENABLE_MALICIOUS
struct AttackedPeer *tmp_att_peer;
if ( (1 == mal_type) ||
(3 == mal_type) )
{ /* Try to maximise representation */
tmp_att_peer = GNUNET_new (struct AttackedPeer);
tmp_att_peer->peer_id = *peer;
if (NULL == att_peer_set)
att_peer_set = GNUNET_CONTAINER_multipeermap_create (1, GNUNET_NO);
if (GNUNET_NO ==
GNUNET_CONTAINER_multipeermap_contains (att_peer_set,
peer))
{
GNUNET_CONTAINER_DLL_insert (att_peers_head,
att_peers_tail,
tmp_att_peer);
add_peer_array_to_set (peer, 1, att_peer_set);
}
else
{
GNUNET_free (tmp_att_peer);
}
}
else if (2 == mal_type)
{
/* We attack one single well-known peer - simply ignore */
}
#endif /* ENABLE_MALICIOUS */
/* Add the sending peer to the push_map */
CustomPeerMap_put (push_map, peer);
GNUNET_break_op (check_peer_known (peer));
GNUNET_CADET_receive_done (channel_ctx->channel);
}
/**
* Handle PULL REQUEST request message from another peer.
*
* Reply with the view of PeerIDs.
*
* @param cls Closure
* @param msg The message header
*/
static void
handle_peer_pull_request (void *cls,
const struct GNUNET_MessageHeader *msg)
{
const struct ChannelCtx *channel_ctx = cls;
const struct GNUNET_PeerIdentity *peer = &channel_ctx->peer_ctx->peer_id;
const struct GNUNET_PeerIdentity *view_array;
(void) msg;
LOG (GNUNET_ERROR_TYPE_DEBUG, "Received PULL REQUEST (%s)\n", GNUNET_i2s (peer));
GNUNET_STATISTICS_update(stats, "# pull request message received", 1, GNUNET_NO);
#ifdef ENABLE_MALICIOUS
if (1 == mal_type
|| 3 == mal_type)
{ /* Try to maximise representation */
send_pull_reply (peer, mal_peers, num_mal_peers);
}
else if (2 == mal_type)
{ /* Try to partition network */
if (0 == GNUNET_CRYPTO_cmp_peer_identity (&attacked_peer, peer))
{
send_pull_reply (peer, mal_peers, num_mal_peers);
}
}
#endif /* ENABLE_MALICIOUS */
GNUNET_break_op (check_peer_known (peer));
GNUNET_CADET_receive_done (channel_ctx->channel);
view_array = View_get_as_array ();
send_pull_reply (peer, view_array, View_size ());
}
/**
* Check whether we sent a corresponding request and
* whether this reply is the first one.
*
* @param cls Closure
* @param msg The message header
*/
static int
check_peer_pull_reply (void *cls,
const struct GNUNET_RPS_P2P_PullReplyMessage *msg)
{
struct ChannelCtx *channel_ctx = cls;
struct PeerContext *sender_ctx = channel_ctx->peer_ctx;
if (sizeof (struct GNUNET_RPS_P2P_PullReplyMessage) > ntohs (msg->header.size))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if ((ntohs (msg->header.size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
sizeof (struct GNUNET_PeerIdentity) != ntohl (msg->num_peers))
{
LOG (GNUNET_ERROR_TYPE_ERROR,
"message says it sends %" PRIu32 " peers, have space for %lu peers\n",
ntohl (msg->num_peers),
(ntohs (msg->header.size) - sizeof (struct GNUNET_RPS_P2P_PullReplyMessage)) /
sizeof (struct GNUNET_PeerIdentity));
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (GNUNET_YES != check_peer_flag (&sender_ctx->peer_id,
Peers_PULL_REPLY_PENDING))
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Received a pull reply from a peer (%s) we didn't request one from!\n",
GNUNET_i2s (&sender_ctx->peer_id));
GNUNET_STATISTICS_update (stats,
"# unrequested pull replies",
1,
GNUNET_NO);
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Handle PULL REPLY message from another peer.
*
* @param cls Closure
* @param msg The message header
*/
static void
handle_peer_pull_reply (void *cls,
const struct GNUNET_RPS_P2P_PullReplyMessage *msg)
{
const struct ChannelCtx *channel_ctx = cls;
const struct GNUNET_PeerIdentity *sender = &channel_ctx->peer_ctx->peer_id;
const struct GNUNET_PeerIdentity *peers;
uint32_t i;
#ifdef ENABLE_MALICIOUS
struct AttackedPeer *tmp_att_peer;
#endif /* ENABLE_MALICIOUS */
LOG (GNUNET_ERROR_TYPE_DEBUG, "Received PULL REPLY (%s)\n", GNUNET_i2s (sender));
GNUNET_STATISTICS_update(stats, "# pull reply messages received", 1, GNUNET_NO);
#ifdef ENABLE_MALICIOUS
// We shouldn't even receive pull replies as we're not sending
if (2 == mal_type)
{
}
#endif /* ENABLE_MALICIOUS */
/* Do actual logic */
peers = (const struct GNUNET_PeerIdentity *) &msg[1];
LOG (GNUNET_ERROR_TYPE_DEBUG,
"PULL REPLY received, got following %u peers:\n",
ntohl (msg->num_peers));
for (i = 0; i < ntohl (msg->num_peers); i++)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"%u. %s\n",
i,
GNUNET_i2s (&peers[i]));
#ifdef ENABLE_MALICIOUS
if ((NULL != att_peer_set) &&
(1 == mal_type || 3 == mal_type))
{ /* Add attacked peer to local list */
// TODO check if we sent a request and this was the first reply
if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (att_peer_set,
&peers[i])
&& GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains (mal_peer_set,
&peers[i]))
{
tmp_att_peer = GNUNET_new (struct AttackedPeer);
tmp_att_peer->peer_id = peers[i];
GNUNET_CONTAINER_DLL_insert (att_peers_head,
att_peers_tail,
tmp_att_peer);
add_peer_array_to_set (&peers[i], 1, att_peer_set);
}
continue;
}
#endif /* ENABLE_MALICIOUS */
/* Make sure we 'know' about this peer */
(void) insert_peer (&peers[i]);
if (GNUNET_YES == check_peer_valid (&peers[i]))
{
CustomPeerMap_put (pull_map, &peers[i]);
}
else
{
schedule_operation (&peers[i], insert_in_pull_map);
(void) issue_peer_liveliness_check (&peers[i]);
}
}
UNSET_PEER_FLAG (get_peer_ctx (sender), Peers_PULL_REPLY_PENDING);
clean_peer (sender);
GNUNET_break_op (check_peer_known (sender));
GNUNET_CADET_receive_done (channel_ctx->channel);
}
/**
* Compute a random delay.
* A uniformly distributed value between mean + spread and mean - spread.
*
* For example for mean 4 min and spread 2 the minimum is (4 min - (1/2 * 4 min))
* It would return a random value between 2 and 6 min.
*
* @param mean the mean
* @param spread the inverse amount of deviation from the mean
*/
static struct GNUNET_TIME_Relative
compute_rand_delay (struct GNUNET_TIME_Relative mean,
unsigned int spread)
{
struct GNUNET_TIME_Relative half_interval;
struct GNUNET_TIME_Relative ret;
unsigned int rand_delay;
unsigned int max_rand_delay;
if (0 == spread)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Not accepting spread of 0\n");
GNUNET_break (0);
GNUNET_assert (0);
}
GNUNET_assert (0 != mean.rel_value_us);
/* Compute random time value between spread * mean and spread * mean */
half_interval = GNUNET_TIME_relative_divide (mean, spread);
max_rand_delay = GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us / mean.rel_value_us * (2/spread);
/**
* Compute random value between (0 and 1) * round_interval
* via multiplying round_interval with a 'fraction' (0 to value)/value
*/
rand_delay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, max_rand_delay);
ret = GNUNET_TIME_relative_saturating_multiply (mean, rand_delay);
ret = GNUNET_TIME_relative_divide (ret, max_rand_delay);
ret = GNUNET_TIME_relative_add (ret, half_interval);
if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us == ret.rel_value_us)
LOG (GNUNET_ERROR_TYPE_WARNING,
"Returning FOREVER_REL\n");
return ret;
}
/**
* Send single pull request
*
* @param peer_id the peer to send the pull request to.
*/
static void
send_pull_request (const struct GNUNET_PeerIdentity *peer)
{
struct GNUNET_MQ_Envelope *ev;
GNUNET_assert (GNUNET_NO == check_peer_flag (peer,
Peers_PULL_REPLY_PENDING));
SET_PEER_FLAG (get_peer_ctx (peer), Peers_PULL_REPLY_PENDING);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send PULL REQUEST to peer %s.\n",
GNUNET_i2s (peer));
ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST);
send_message (peer, ev, "PULL REQUEST");
GNUNET_STATISTICS_update(stats, "# pull request send issued", 1, GNUNET_NO);
}
/**
* Send single push
*
* @param peer_id the peer to send the push to.
*/
static void
send_push (const struct GNUNET_PeerIdentity *peer_id)
{
struct GNUNET_MQ_Envelope *ev;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send PUSH to peer %s.\n",
GNUNET_i2s (peer_id));
ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_RPS_PP_PUSH);
send_message (peer_id, ev, "PUSH");
GNUNET_STATISTICS_update(stats, "# push send issued", 1, GNUNET_NO);
}
static void
do_round (void *cls);
static void
do_mal_round (void *cls);
#ifdef ENABLE_MALICIOUS
/**
* @brief This function is called, when the client tells us to act malicious.
* It verifies that @a msg is well-formed.
*
* @param cls the closure (#ClientContext)
* @param msg the message
* @return #GNUNET_OK if @a msg is well-formed
*/
static int
check_client_act_malicious (void *cls,
const struct GNUNET_RPS_CS_ActMaliciousMessage *msg)
{
struct ClientContext *cli_ctx = cls;
uint16_t msize = ntohs (msg->header.size);
uint32_t num_peers = ntohl (msg->num_peers);
msize -= sizeof (struct GNUNET_RPS_CS_ActMaliciousMessage);
if ( (msize / sizeof (struct GNUNET_PeerIdentity) != num_peers) ||
(msize % sizeof (struct GNUNET_PeerIdentity) != 0) )
{
LOG (GNUNET_ERROR_TYPE_ERROR,
"message says it sends %" PRIu32 " peers, have space for %lu peers\n",
ntohl (msg->num_peers),
(msize / sizeof (struct GNUNET_PeerIdentity)));
GNUNET_break (0);
GNUNET_SERVICE_client_drop (cli_ctx->client);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Turn RPS service to act malicious.
*
* @param cls Closure
* @param client The client that sent the message
* @param msg The message header
*/
static void
handle_client_act_malicious (void *cls,
const struct GNUNET_RPS_CS_ActMaliciousMessage *msg)
{
struct ClientContext *cli_ctx = cls;
struct GNUNET_PeerIdentity *peers;
uint32_t num_mal_peers_sent;
uint32_t num_mal_peers_old;
/* Do actual logic */
peers = (struct GNUNET_PeerIdentity *) &msg[1];
mal_type = ntohl (msg->type);
if (NULL == mal_peer_set)
mal_peer_set = GNUNET_CONTAINER_multipeermap_create (1, GNUNET_NO);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Now acting malicious type %" PRIu32 ", got %" PRIu32 " peers.\n",
mal_type,
ntohl (msg->num_peers));
if (1 == mal_type)
{ /* Try to maximise representation */
/* Add other malicious peers to those we already know */
num_mal_peers_sent = ntohl (msg->num_peers);
num_mal_peers_old = num_mal_peers;
GNUNET_array_grow (mal_peers,
num_mal_peers,
num_mal_peers + num_mal_peers_sent);
GNUNET_memcpy (&mal_peers[num_mal_peers_old],
peers,
num_mal_peers_sent * sizeof (struct GNUNET_PeerIdentity));
/* Add all mal peers to mal_peer_set */
add_peer_array_to_set (&mal_peers[num_mal_peers_old],
num_mal_peers_sent,
mal_peer_set);
/* Substitute do_round () with do_mal_round () */
GNUNET_SCHEDULER_cancel (do_round_task);
do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, NULL);
}
else if ( (2 == mal_type) ||
(3 == mal_type) )
{ /* Try to partition the network */
/* Add other malicious peers to those we already know */
num_mal_peers_sent = ntohl (msg->num_peers) - 1;
num_mal_peers_old = num_mal_peers;
GNUNET_assert (GNUNET_MAX_MALLOC_CHECKED > num_mal_peers_sent);
GNUNET_array_grow (mal_peers,
num_mal_peers,
num_mal_peers + num_mal_peers_sent);
if (NULL != mal_peers &&
0 != num_mal_peers)
{
GNUNET_memcpy (&mal_peers[num_mal_peers_old],
peers,
num_mal_peers_sent * sizeof (struct GNUNET_PeerIdentity));
/* Add all mal peers to mal_peer_set */
add_peer_array_to_set (&mal_peers[num_mal_peers_old],
num_mal_peers_sent,
mal_peer_set);
}
/* Store the one attacked peer */
GNUNET_memcpy (&attacked_peer,
&msg->attacked_peer,
sizeof (struct GNUNET_PeerIdentity));
/* Set the flag of the attacked peer to valid to avoid problems */
if (GNUNET_NO == check_peer_known (&attacked_peer))
{
(void) issue_peer_liveliness_check (&attacked_peer);
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Attacked peer is %s\n",
GNUNET_i2s (&attacked_peer));
/* Substitute do_round () with do_mal_round () */
GNUNET_SCHEDULER_cancel (do_round_task);
do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, NULL);
}
else if (0 == mal_type)
{ /* Stop acting malicious */
GNUNET_array_grow (mal_peers, num_mal_peers, 0);
/* Substitute do_mal_round () with do_round () */
GNUNET_SCHEDULER_cancel (do_round_task);
do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL);
}
else
{
GNUNET_break (0);
GNUNET_SERVICE_client_continue (cli_ctx->client);
}
GNUNET_SERVICE_client_continue (cli_ctx->client);
}
/**
* Send out PUSHes and PULLs maliciously.
*
* This is executed regylary.
*/
static void
do_mal_round (void *cls)
{
uint32_t num_pushes;
uint32_t i;
struct GNUNET_TIME_Relative time_next_round;
struct AttackedPeer *tmp_att_peer;
(void) cls;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to execute next round maliciously type %" PRIu32 ".\n",
mal_type);
do_round_task = NULL;
GNUNET_assert (mal_type <= 3);
/* Do malicious actions */
if (1 == mal_type)
{ /* Try to maximise representation */
/* The maximum of pushes we're going to send this round */
num_pushes = GNUNET_MIN (GNUNET_MIN (push_limit,
num_attacked_peers),
GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send %" PRIu32 " pushes\n",
num_pushes);
/* Send PUSHes to attacked peers */
for (i = 0 ; i < num_pushes ; i++)
{
if (att_peers_tail == att_peer_index)
att_peer_index = att_peers_head;
else
att_peer_index = att_peer_index->next;
send_push (&att_peer_index->peer_id);
}
/* Send PULLs to some peers to learn about additional peers to attack */
tmp_att_peer = att_peer_index;
for (i = 0 ; i < num_pushes * alpha ; i++)
{
if (att_peers_tail == tmp_att_peer)
tmp_att_peer = att_peers_head;
else
att_peer_index = tmp_att_peer->next;
send_pull_request (&tmp_att_peer->peer_id);
}
}
else if (2 == mal_type)
{ /**
* Try to partition the network
* Send as many pushes to the attacked peer as possible
* That is one push per round as it will ignore more.
*/
(void) issue_peer_liveliness_check (&attacked_peer);
if (GNUNET_YES == check_peer_flag (&attacked_peer, Peers_ONLINE))
send_push (&attacked_peer);
}
if (3 == mal_type)
{ /* Combined attack */
/* Send PUSH to attacked peers */
if (GNUNET_YES == check_peer_known (&attacked_peer))
{
(void) issue_peer_liveliness_check (&attacked_peer);
if (GNUNET_YES == check_peer_flag (&attacked_peer, Peers_ONLINE))
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Goding to send push to attacked peer (%s)\n",
GNUNET_i2s (&attacked_peer));
send_push (&attacked_peer);
}
}
(void) issue_peer_liveliness_check (&attacked_peer);
/* The maximum of pushes we're going to send this round */
num_pushes = GNUNET_MIN (GNUNET_MIN (push_limit - 1,
num_attacked_peers),
GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send %" PRIu32 " pushes\n",
num_pushes);
for (i = 0; i < num_pushes; i++)
{
if (att_peers_tail == att_peer_index)
att_peer_index = att_peers_head;
else
att_peer_index = att_peer_index->next;
send_push (&att_peer_index->peer_id);
}
/* Send PULLs to some peers to learn about additional peers to attack */
tmp_att_peer = att_peer_index;
for (i = 0; i < num_pushes * alpha; i++)
{
if (att_peers_tail == tmp_att_peer)
tmp_att_peer = att_peers_head;
else
att_peer_index = tmp_att_peer->next;
send_pull_request (&tmp_att_peer->peer_id);
}
}
/* Schedule next round */
time_next_round = compute_rand_delay (round_interval, 2);
//do_round_task = GNUNET_SCHEDULER_add_delayed (round_interval, &do_mal_round,
//NULL);
GNUNET_assert (NULL == do_round_task);
do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
&do_mal_round, NULL);
LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
}
#endif /* ENABLE_MALICIOUS */
/**
* Send out PUSHes and PULLs, possibly update #view, samplers.
*
* This is executed regylary.
*/
static void
do_round (void *cls)
{
unsigned int i;
const struct GNUNET_PeerIdentity *view_array;
unsigned int *permut;
unsigned int a_peers; /* Number of peers we send pushes to */
unsigned int b_peers; /* Number of peers we send pull requests to */
uint32_t first_border;
uint32_t second_border;
struct GNUNET_PeerIdentity peer;
struct GNUNET_PeerIdentity *update_peer;
(void) cls;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to execute next round.\n");
GNUNET_STATISTICS_update(stats, "# rounds", 1, GNUNET_NO);
do_round_task = NULL;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Printing view:\n");
to_file (file_name_view_log,
"___ new round ___");
view_array = View_get_as_array ();
for (i = 0; i < View_size (); i++)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"\t%s\n", GNUNET_i2s (&view_array[i]));
to_file (file_name_view_log,
"=%s\t(do round)",
GNUNET_i2s_full (&view_array[i]));
}
/* Send pushes and pull requests */
if (0 < View_size ())
{
permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
View_size ());
/* Send PUSHes */
a_peers = ceil (alpha * View_size ());
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send pushes to %u (ceil (%f * %u)) peers.\n",
a_peers, alpha, View_size ());
for (i = 0; i < a_peers; i++)
{
peer = view_array[permut[i]];
// FIXME if this fails schedule/loop this for later
send_push (&peer);
}
/* Send PULL requests */
b_peers = ceil (beta * View_size ());
first_border = a_peers;
second_border = a_peers + b_peers;
if (second_border > View_size ())
{
first_border = View_size () - b_peers;
second_border = View_size ();
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Going to send pulls to %u (ceil (%f * %u)) peers.\n",
b_peers, beta, View_size ());
for (i = first_border; i < second_border; i++)
{
peer = view_array[permut[i]];
if ( GNUNET_NO == check_peer_flag (&peer, Peers_PULL_REPLY_PENDING))
{ // FIXME if this fails schedule/loop this for later
send_pull_request (&peer);
}
}
GNUNET_free (permut);
permut = NULL;
}
/* Update view */
/* TODO see how many peers are in push-/pull- list! */
if ((CustomPeerMap_size (push_map) <= alpha * view_size_est_need) &&
(0 < CustomPeerMap_size (push_map)) &&
(0 < CustomPeerMap_size (pull_map)))
//if (GNUNET_YES) // disable blocking temporarily
{ /* If conditions for update are fulfilled, update */
LOG (GNUNET_ERROR_TYPE_DEBUG, "Update of the view.\n");
uint32_t final_size;
uint32_t peers_to_clean_size;
struct GNUNET_PeerIdentity *peers_to_clean;
peers_to_clean = NULL;
peers_to_clean_size = 0;
GNUNET_array_grow (peers_to_clean, peers_to_clean_size, View_size ());
GNUNET_memcpy (peers_to_clean,
view_array,
View_size () * sizeof (struct GNUNET_PeerIdentity));
/* Seems like recreating is the easiest way of emptying the peermap */
View_clear ();
to_file (file_name_view_log,
"--- emptied ---");
first_border = GNUNET_MIN (ceil (alpha * view_size_est_need),
CustomPeerMap_size (push_map));
second_border = first_border +
GNUNET_MIN (floor (beta * view_size_est_need),
CustomPeerMap_size (pull_map));
final_size = second_border +
ceil ((1 - (alpha + beta)) * view_size_est_need);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"first border: %" PRIu32 ", second border: %" PRIu32 ", final size: %"PRIu32 "\n",
first_border,
second_border,
final_size);
/* Update view with peers received through PUSHes */
permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
CustomPeerMap_size (push_map));
for (i = 0; i < first_border; i++)
{
(void) insert_in_view (CustomPeerMap_get_peer_by_index (push_map,
permut[i]));
to_file (file_name_view_log,
"+%s\t(push list)",
GNUNET_i2s_full (&view_array[i]));
// TODO change the peer_flags accordingly
}
GNUNET_free (permut);
permut = NULL;
/* Update view with peers received through PULLs */
permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
CustomPeerMap_size (pull_map));
for (i = first_border; i < second_border; i++)
{
(void) insert_in_view (CustomPeerMap_get_peer_by_index (pull_map,
permut[i - first_border]));
to_file (file_name_view_log,
"+%s\t(pull list)",
GNUNET_i2s_full (&view_array[i]));
// TODO change the peer_flags accordingly
}
GNUNET_free (permut);
permut = NULL;
/* Update view with peers from history */
RPS_sampler_get_n_rand_peers (prot_sampler,
hist_update,
NULL,
final_size - second_border);
// TODO change the peer_flags accordingly
for (i = 0; i < View_size (); i++)
rem_from_list (&peers_to_clean, &peers_to_clean_size, &view_array[i]);
/* Clean peers that were removed from the view */
for (i = 0; i < peers_to_clean_size; i++)
{
to_file (file_name_view_log,
"-%s",
GNUNET_i2s_full (&peers_to_clean[i]));
clean_peer (&peers_to_clean[i]);
}
GNUNET_array_grow (peers_to_clean, peers_to_clean_size, 0);
clients_notify_view_update();
} else {
LOG (GNUNET_ERROR_TYPE_DEBUG, "No update of the view.\n");
GNUNET_STATISTICS_update(stats, "# rounds blocked", 1, GNUNET_NO);
if (CustomPeerMap_size (push_map) > alpha * View_size () &&
!(0 >= CustomPeerMap_size (pull_map)))
GNUNET_STATISTICS_update(stats, "# rounds blocked - too many pushes", 1, GNUNET_NO);
if (CustomPeerMap_size (push_map) > alpha * View_size () &&
(0 >= CustomPeerMap_size (pull_map)))
GNUNET_STATISTICS_update(stats, "# rounds blocked - too many pushes, no pull replies", 1, GNUNET_NO);
if (0 >= CustomPeerMap_size (push_map) &&
!(0 >= CustomPeerMap_size (pull_map)))
GNUNET_STATISTICS_update(stats, "# rounds blocked - no pushes", 1, GNUNET_NO);
if (0 >= CustomPeerMap_size (push_map) &&
(0 >= CustomPeerMap_size (pull_map)))
GNUNET_STATISTICS_update(stats, "# rounds blocked - no pushes, no pull replies", 1, GNUNET_NO);
if (0 >= CustomPeerMap_size (pull_map) &&
CustomPeerMap_size (push_map) > alpha * View_size () &&
0 >= CustomPeerMap_size (push_map))
GNUNET_STATISTICS_update(stats, "# rounds blocked - no pull replies", 1, GNUNET_NO);
}
// TODO independent of that also get some peers from CADET_get_peers()?
GNUNET_STATISTICS_set (stats,
"# peers in push map at end of round",
CustomPeerMap_size (push_map),
GNUNET_NO);
GNUNET_STATISTICS_set (stats,
"# peers in pull map at end of round",
CustomPeerMap_size (pull_map),
GNUNET_NO);
GNUNET_STATISTICS_set (stats,
"# peers in view at end of round",
View_size (),
GNUNET_NO);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Received %u pushes and %u pulls last round (alpha (%.2f) * view_size (%u) = %.2f)\n",
CustomPeerMap_size (push_map),
CustomPeerMap_size (pull_map),
alpha,
View_size (),
alpha * View_size ());
/* Update samplers */
for (i = 0; i < CustomPeerMap_size (push_map); i++)
{
update_peer = CustomPeerMap_get_peer_by_index (push_map, i);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Updating with peer %s from push list\n",
GNUNET_i2s (update_peer));
insert_in_sampler (NULL, update_peer);
clean_peer (update_peer); /* This cleans only if it is not in the view */
}
for (i = 0; i < CustomPeerMap_size (pull_map); i++)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Updating with peer %s from pull list\n",
GNUNET_i2s (CustomPeerMap_get_peer_by_index (pull_map, i)));
insert_in_sampler (NULL, CustomPeerMap_get_peer_by_index (pull_map, i));
/* This cleans only if it is not in the view */
clean_peer (CustomPeerMap_get_peer_by_index (pull_map, i));
}
/* Empty push/pull lists */
CustomPeerMap_clear (push_map);
CustomPeerMap_clear (pull_map);
GNUNET_STATISTICS_set (stats,
"view size",
View_size(),
GNUNET_NO);
struct GNUNET_TIME_Relative time_next_round;
time_next_round = compute_rand_delay (round_interval, 2);
/* Schedule next round */
do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
&do_round, NULL);
LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
}
/**
* This is called from GNUNET_CADET_get_peers().
*
* It is called on every peer(ID) that cadet somehow has contact with.
* We use those to initialise the sampler.
*/
void
init_peer_cb (void *cls,
const struct GNUNET_PeerIdentity *peer,
int tunnel, // "Do we have a tunnel towards this peer?"
unsigned int n_paths, // "Number of known paths towards this peer"
unsigned int best_path) // "How long is the best path?
// (0 = unknown, 1 = ourselves, 2 = neighbor)"
{
(void) cls;
(void) tunnel;
(void) n_paths;
(void) best_path;
if (NULL != peer)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Got peer_id %s from cadet\n",
GNUNET_i2s (peer));
got_peer (peer);
}
}
/**
* @brief Iterator function over stored, valid peers.
*
* We initialise the sampler with those.
*
* @param cls the closure
* @param peer the peer id
* @return #GNUNET_YES if we should continue to
* iterate,
* #GNUNET_NO if not.
*/
static int
valid_peers_iterator (void *cls,
const struct GNUNET_PeerIdentity *peer)
{
(void) cls;
if (NULL != peer)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Got stored, valid peer %s\n",
GNUNET_i2s (peer));
got_peer (peer);
}
return GNUNET_YES;
}
/**
* Iterator over peers from peerinfo.
*
* @param cls closure
* @param peer id of the peer, NULL for last call
* @param hello hello message for the peer (can be NULL)
* @param error message
*/
void
process_peerinfo_peers (void *cls,
const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_HELLO_Message *hello,
const char *err_msg)
{
(void) cls;
(void) hello;
(void) err_msg;
if (NULL != peer)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Got peer_id %s from peerinfo\n",
GNUNET_i2s (peer));
got_peer (peer);
}
}
/**
* Task run during shutdown.
*
* @param cls unused
*/
static void
shutdown_task (void *cls)
{
struct ClientContext *client_ctx;
struct ReplyCls *reply_cls;
(void) cls;
in_shutdown = GNUNET_YES;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"RPS is going down\n");
/* Clean all clients */
for (client_ctx = cli_ctx_head;
NULL != cli_ctx_head;
client_ctx = cli_ctx_head)
{
/* Clean pending requests to the sampler */
for (reply_cls = client_ctx->rep_cls_head;
NULL != client_ctx->rep_cls_head;
reply_cls = client_ctx->rep_cls_head)
{
RPS_sampler_request_cancel (reply_cls->req_handle);
GNUNET_CONTAINER_DLL_remove (client_ctx->rep_cls_head,
client_ctx->rep_cls_tail,
reply_cls);
GNUNET_free (reply_cls);
}
GNUNET_CONTAINER_DLL_remove (cli_ctx_head,
cli_ctx_tail,
client_ctx);
GNUNET_free (client_ctx);
}
GNUNET_PEERINFO_notify_cancel (peerinfo_notify_handle);
GNUNET_PEERINFO_disconnect (peerinfo_handle);
peerinfo_handle = NULL;
if (NULL != do_round_task)
{
GNUNET_SCHEDULER_cancel (do_round_task);
do_round_task = NULL;
}
peers_terminate ();
GNUNET_NSE_disconnect (nse);
RPS_sampler_destroy (prot_sampler);
RPS_sampler_destroy (client_sampler);
GNUNET_CADET_close_port (cadet_port);
GNUNET_CADET_disconnect (cadet_handle);
cadet_handle = NULL;
View_destroy ();
CustomPeerMap_destroy (push_map);
CustomPeerMap_destroy (pull_map);
if (NULL != stats)
{
GNUNET_STATISTICS_destroy (stats,
GNUNET_NO);
stats = NULL;
}
#ifdef ENABLE_MALICIOUS
struct AttackedPeer *tmp_att_peer;
/* it is ok to free this const during shutdown: */
GNUNET_free ((char *) file_name_view_log);
#ifdef TO_FILE
GNUNET_free ((char *) file_name_observed_log);
GNUNET_CONTAINER_multipeermap_destroy (observed_unique_peers);
#endif /* TO_FILE */
GNUNET_array_grow (mal_peers,
num_mal_peers,
0);
if (NULL != mal_peer_set)
GNUNET_CONTAINER_multipeermap_destroy (mal_peer_set);
if (NULL != att_peer_set)
GNUNET_CONTAINER_multipeermap_destroy (att_peer_set);
while (NULL != att_peers_head)
{
tmp_att_peer = att_peers_head;
GNUNET_CONTAINER_DLL_remove (att_peers_head,
att_peers_tail,
tmp_att_peer);
GNUNET_free (tmp_att_peer);
}
#endif /* ENABLE_MALICIOUS */
}
/**
* Handle client connecting to the service.
*
* @param cls NULL
* @param client the new client
* @param mq the message queue of @a client
* @return @a client
*/
static void *
client_connect_cb (void *cls,
struct GNUNET_SERVICE_Client *client,
struct GNUNET_MQ_Handle *mq)
{
struct ClientContext *cli_ctx;
(void) cls;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Client connected\n");
if (NULL == client)
return client; /* Server was destroyed before a client connected. Shutting down */
cli_ctx = GNUNET_new (struct ClientContext);
cli_ctx->mq = mq;
cli_ctx->view_updates_left = -1;
cli_ctx->client = client;
GNUNET_CONTAINER_DLL_insert (cli_ctx_head,
cli_ctx_tail,
cli_ctx);
return cli_ctx;
}
/**
* Callback called when a client disconnected from the service
*
* @param cls closure for the service
* @param c the client that disconnected
* @param internal_cls should be equal to @a c
*/
static void
client_disconnect_cb (void *cls,
struct GNUNET_SERVICE_Client *client,
void *internal_cls)
{
struct ClientContext *cli_ctx = internal_cls;
(void) cls;
GNUNET_assert (client == cli_ctx->client);
if (NULL == client)
{/* shutdown task - destroy all clients */
while (NULL != cli_ctx_head)
destroy_cli_ctx (cli_ctx_head);
}
else
{ /* destroy this client */
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Client disconnected. Destroy its context.\n");
destroy_cli_ctx (cli_ctx);
}
}
/**
* Handle random peer sampling clients.
*
* @param cls closure
* @param c configuration to use
* @param service the initialized service
*/
static void
run (void *cls,
const struct GNUNET_CONFIGURATION_Handle *c,
struct GNUNET_SERVICE_Handle *service)
{
char *fn_valid_peers;
(void) cls;
(void) service;
GNUNET_log_setup ("rps",
GNUNET_error_type_to_string (GNUNET_ERROR_TYPE_DEBUG),
NULL);
cfg = c;
/* Get own ID */
GNUNET_CRYPTO_get_peer_identity (cfg,
&own_identity); // TODO check return value
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"STARTING SERVICE (rps) for peer [%s]\n",
GNUNET_i2s (&own_identity));
#ifdef ENABLE_MALICIOUS
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Malicious execution compiled in.\n");
#endif /* ENABLE_MALICIOUS */
/* Get time interval from the configuration */
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (cfg,
"RPS",
"ROUNDINTERVAL",
&round_interval))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"RPS", "ROUNDINTERVAL");
GNUNET_SCHEDULER_shutdown ();
return;
}
/* Get initial size of sampler/view from the configuration */
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg, "RPS", "MINSIZE",
(long long unsigned int *) &sampler_size_est_min))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"RPS", "MINSIZE");
GNUNET_SCHEDULER_shutdown ();
return;
}
sampler_size_est_need = sampler_size_est_min;
view_size_est_min = sampler_size_est_min;
LOG (GNUNET_ERROR_TYPE_DEBUG, "MINSIZE is %u\n", sampler_size_est_min);
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"rps",
"FILENAME_VALID_PEERS",
&fn_valid_peers))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"rps", "FILENAME_VALID_PEERS");
}
View_create (view_size_est_min);
GNUNET_STATISTICS_set (stats, "view size aim", view_size_est_min, GNUNET_NO);
/* file_name_view_log */
file_name_view_log = store_prefix_file_name (&own_identity, "view");
#ifdef TO_FILE
file_name_observed_log = store_prefix_file_name (&own_identity, "observed");
observed_unique_peers = GNUNET_CONTAINER_multipeermap_create (1, GNUNET_NO);
#endif /* TO_FILE */
/* connect to NSE */
nse = GNUNET_NSE_connect (cfg, nse_callback, NULL);
alpha = 0.45;
beta = 0.45;
/* Initialise cadet */
/* There exists a copy-paste-clone in get_channel() */
struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
GNUNET_MQ_hd_fixed_size (peer_check,
GNUNET_MESSAGE_TYPE_RPS_PP_CHECK_LIVE,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_hd_fixed_size (peer_push,
GNUNET_MESSAGE_TYPE_RPS_PP_PUSH,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_hd_fixed_size (peer_pull_request,
GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REQUEST,
struct GNUNET_MessageHeader,
NULL),
GNUNET_MQ_hd_var_size (peer_pull_reply,
GNUNET_MESSAGE_TYPE_RPS_PP_PULL_REPLY,
struct GNUNET_RPS_P2P_PullReplyMessage,
NULL),
GNUNET_MQ_handler_end ()
};
cadet_handle = GNUNET_CADET_connect (cfg);
GNUNET_assert (NULL != cadet_handle);
GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_RPS,
strlen (GNUNET_APPLICATION_PORT_RPS),
&port);
cadet_port = GNUNET_CADET_open_port (cadet_handle,
&port,
&handle_inbound_channel, /* Connect handler */
NULL, /* cls */
NULL, /* WindowSize handler */
&cleanup_destroyed_channel, /* Disconnect handler */
cadet_handlers);
if (NULL == cadet_port)
{
LOG (GNUNET_ERROR_TYPE_ERROR,
"Cadet port `%s' is already in use.\n",
GNUNET_APPLICATION_PORT_RPS);
GNUNET_assert (0);
}
peerinfo_handle = GNUNET_PEERINFO_connect (cfg);
initialise_peers (fn_valid_peers, cadet_handle);
GNUNET_free (fn_valid_peers);
/* Initialise sampler */
struct GNUNET_TIME_Relative half_round_interval;
struct GNUNET_TIME_Relative max_round_interval;
half_round_interval = GNUNET_TIME_relative_divide (round_interval, 2);
max_round_interval = GNUNET_TIME_relative_add (round_interval, half_round_interval);
prot_sampler = RPS_sampler_init (sampler_size_est_need, max_round_interval);
client_sampler = RPS_sampler_mod_init (sampler_size_est_need, max_round_interval);
/* Initialise push and pull maps */
push_map = CustomPeerMap_create (4);
pull_map = CustomPeerMap_create (4);
//LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting peers from CADET\n");
//GNUNET_CADET_get_peers (cadet_handle, &init_peer_cb, NULL);
// TODO send push/pull to each of those peers?
// TODO read stored valid peers from last run
LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting stored valid peers\n");
get_valid_peers (valid_peers_iterator, NULL);
peerinfo_notify_handle = GNUNET_PEERINFO_notify (cfg,
GNUNET_NO,
process_peerinfo_peers,
NULL);
LOG (GNUNET_ERROR_TYPE_INFO, "Ready to receive requests from clients\n");
do_round_task = GNUNET_SCHEDULER_add_now (&do_round, NULL);
LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled first round\n");
GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
stats = GNUNET_STATISTICS_create ("rps", cfg);
}
/**
* Define "main" method using service macro.
*/
GNUNET_SERVICE_MAIN
("rps",
GNUNET_SERVICE_OPTION_NONE,
&run,
&client_connect_cb,
&client_disconnect_cb,
NULL,
GNUNET_MQ_hd_fixed_size (client_request,
GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST,
struct GNUNET_RPS_CS_RequestMessage,
NULL),
GNUNET_MQ_hd_fixed_size (client_request_cancel,
GNUNET_MESSAGE_TYPE_RPS_CS_REQUEST_CANCEL,
struct GNUNET_RPS_CS_RequestCancelMessage,
NULL),
GNUNET_MQ_hd_var_size (client_seed,
GNUNET_MESSAGE_TYPE_RPS_CS_SEED,
struct GNUNET_RPS_CS_SeedMessage,
NULL),
#ifdef ENABLE_MALICIOUS
GNUNET_MQ_hd_var_size (client_act_malicious,
GNUNET_MESSAGE_TYPE_RPS_ACT_MALICIOUS,
struct GNUNET_RPS_CS_ActMaliciousMessage,
NULL),
#endif /* ENABLE_MALICIOUS */
GNUNET_MQ_hd_fixed_size (client_view_request,
GNUNET_MESSAGE_TYPE_RPS_CS_DEBUG_VIEW_REQUEST,
struct GNUNET_RPS_CS_DEBUG_ViewRequest,
NULL),
GNUNET_MQ_handler_end());
/* end of gnunet-service-rps.c */