/*
- This file is part of GNUnet.
- (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
-
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
-
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ This file is part of GNUnet.
+ (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
*/
/**
* @file nse/gnunet-service-nse.c
* @brief network size estimation service
* @author Nathan Evans
+ * @author Christian Grothoff
*
* The purpose of this service is to estimate the size of the network.
* Given a specified interval, each peer hashes the most recent
- * timestamp which is evenly divisible by that interval. This hash
- * is compared in distance to the peer identity to choose an offset.
- * The closer the peer identity to the hashed timestamp, the earlier
- * the peer sends out a "nearest peer" message. The closest peer's
+ * timestamp which is evenly divisible by that interval. This hash is
+ * compared in distance to the peer identity to choose an offset. The
+ * closer the peer identity to the hashed timestamp, the earlier the
+ * peer sends out a "nearest peer" message. The closest peer's
* message should thus be received before any others, which stops
* those peer from sending their messages at a later duration. So
- * every peer should receive the same nearest peer message, and
- * from this can calculate the expected number of peers in the
- * network.
+ * every peer should receive the same nearest peer message, and from
+ * this can calculate the expected number of peers in the network.
*
+ * TODO:
+ * - generate proof-of-work asynchronously, store it on disk & load it back
+ * - handle messages for future round (one into the future, see FIXME)
*/
#include "platform.h"
#include "gnunet_client_lib.h"
#include "gnunet_nse_service.h"
#include "nse.h"
-#define DEFAULT_HISTORY_SIZE 20
+/**
+ * Over how many values do we calculate the weighted average?
+ */
+#define HISTORY_SIZE 8
-#define DEFAULT_CORE_QUEUE_SIZE 32
+/**
+ * Size of the queue to core.
+ */
+#define CORE_QUEUE_SIZE 2
-#define DEFAULT_NSE_PRIORITY 5
+/**
+ * Message priority to use.
+ */
+#define NSE_PRIORITY 5
-#define DO_FORWARD GNUNET_YES
+/**
+ * Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.
+ */
+#define NSE_WORK_REQUIRED 0
/**
- * Entry in the list of clients which
- * should be notified upon a new network
- * size estimate calculation.
+ * Interval for sending network size estimation flood requests.
*/
-struct ClientListEntry
+#define GNUNET_NSE_INTERVAL GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
+
+
+/**
+ * Per-peer information.
+ */
+struct NSEPeerEntry
{
+
/**
- * Pointer to previous entry
+ * Pending message for this peer.
*/
- struct ClientListEntry *prev;
+ struct GNUNET_MessageHeader *pending_message;
/**
- * Pointer to next entry
+ * Core handle for sending messages to this peer.
*/
- struct ClientListEntry *next;
+ struct GNUNET_CORE_TransmitHandle *th;
/**
- * Client to notify.
+ * What is the identity of the peer?
*/
- struct GNUNET_SERVER_Client *client;
+ struct GNUNET_PeerIdentity id;
+
+ /**
+ * Task scheduled to send message to this peer.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier transmit_task;
+
+ /**
+ * Did we receive or send a message about the previous round
+ * to this peer yet?
+ */
+ int previous_round;
};
+
/**
- * Per-peer information.
+ * Network size estimate reply; sent when "this"
+ * peer's timer has run out before receiving a
+ * valid reply from another peer.
*/
-struct NSEPeerEntry
+struct GNUNET_NSE_FloodMessage
{
/**
- * Next peer entry (DLL)
+ * Type: GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD
*/
- struct NSEPeerEntry *next;
+ struct GNUNET_MessageHeader header;
/**
- * Prev peer entry (DLL)
+ * Number of hops this message has taken so far.
*/
- struct NSEPeerEntry *prev;
+ uint32_t hop_count;
/**
- * Pending message for this peer.
+ * Purpose.
*/
- struct GNUNET_MessageHeader *pending_message;
+ struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
/**
- * Core handle for sending messages to this peer.
+ * The current timestamp value (which all
+ * peers should agree on).
*/
- struct GNUNET_CORE_TransmitHandle *th;
+ struct GNUNET_TIME_AbsoluteNBO timestamp;
/**
- * What is the identity of the peer?
+ * Number of matching bits between the hash
+ * of timestamp and the initiator's public
+ * key.
*/
- struct GNUNET_PeerIdentity id;
+ uint32_t matching_bits;
+
+ /**
+ * Public key of the originator.
+ */
+ struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
+
+ /**
+ * Proof of work, causing leading zeros when hashed with pkey.
+ */
+ uint64_t proof_of_work;
+
+ /**
+ * Signature (over range specified in purpose).
+ */
+ struct GNUNET_CRYPTO_RsaSignature signature;
};
+
/**
* Handle to our current configuration.
*/
static struct GNUNET_CORE_Handle *coreAPI;
/**
- * Head of global list of peers.
- */
-static struct NSEPeerEntry *peers_head;
-
-/**
- * Head of global list of clients.
- */
-static struct NSEPeerEntry *peers_tail;
-
-/**
- * Head of global list of clients.
- */
-static struct ClientListEntry *cle_head;
-
-/**
- * Tail of global list of clients.
+ * Map of all connected peers.
*/
-static struct ClientListEntry *cle_tail;
+static struct GNUNET_CONTAINER_MultiHashMap *peers;
/**
- * The current network size estimate.
- * Number of bits matching on average
- * thus far.
+ * The current network size estimate. Number of bits matching on
+ * average thus far.
*/
static double current_size_estimate;
/**
- * The standard deviation of the last
- * DEFAULT_HISTORY_SIZE network size estimates.
+ * The standard deviation of the last HISTORY_SIZE network
+ * size estimates.
*/
-static double current_std_dev;
+static double current_std_dev = NAN;
/**
- * Array of the last DEFAULT_HISTORY_SIZE
- * network size estimates (matching bits, actually).
+ * Current hop counter estimate (estimate for network diameter).
*/
-static unsigned int size_estimates[DEFAULT_HISTORY_SIZE];
+static uint32_t hop_count_max;
/**
- * Array of size estimate messages.
+ * Array of recent size estimate messages.
*/
-static struct GNUNET_NSE_FloodMessage
- size_estimate_messages[DEFAULT_HISTORY_SIZE];
+static struct GNUNET_NSE_FloodMessage size_estimate_messages[HISTORY_SIZE];
/**
* Index of most recent estimate.
static unsigned int estimate_index;
/**
- * Task scheduled to send flood message.
+ * Task scheduled to update our flood message for the next round.
*/
static GNUNET_SCHEDULER_TaskIdentifier flood_task;
-/**
- * Task to schedule flood message and update state.
- */
-static GNUNET_SCHEDULER_TaskIdentifier schedule_flood_task;
-
/**
* Notification context, simplifies client broadcasts.
*/
static struct GNUNET_SERVER_NotificationContext *nc;
-/**
- * The previous major time.
- */
-static struct GNUNET_TIME_Absolute previous_timestamp;
-
/**
* The next major time.
*/
static struct GNUNET_TIME_Absolute next_timestamp;
/**
- * Base increment of time to add to send time.
+ * The current major time.
*/
-static struct GNUNET_TIME_Relative increment;
-
-/**
- * The current network size estimate message.
- */
-static struct GNUNET_NSE_ClientMessage current_estimate_message;
+static struct GNUNET_TIME_Absolute current_timestamp;
/**
* The public key of this peer.
static struct GNUNET_PeerIdentity my_identity;
/**
- * Our flood message, updated whenever a flood is sent.
+ * Proof of work for this peer.
*/
-static struct GNUNET_NSE_FloodMessage flood_message;
+static uint64_t my_proof;
+
+
+/**
+ * Initialize a message to clients with the current network
+ * size estimate.
+ *
+ * @param em message to fill in
+ */
+static void
+setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
+{
+ unsigned int i;
+ double mean;
+ double sum;
+ double std_dev;
+ double variance;
+ double val;
+ double weight;
+ double sumweight;
+ double q;
+ double r;
+ double temp;
+
+ /* Weighted incremental algorithm for stddev according to West (1979) */
+ mean = 0.0;
+ sum = 0.0;
+ sumweight = 0.0;
+ for (i=0; i<HISTORY_SIZE; i++)
+ {
+ val = htonl (size_estimate_messages[i].matching_bits);
+ weight = HISTORY_SIZE - ((estimate_index + HISTORY_SIZE - i) % HISTORY_SIZE);
+
+ temp = weight + sumweight;
+ q = val - mean;
+ r = q * weight / temp;
+ sum += sumweight * q * r;
+ mean += r;
+ sumweight = temp;
+ }
+ variance = sum / (sumweight - 1.0);
+ GNUNET_assert (variance >= 0);
+ std_dev = sqrt (variance);
+ current_std_dev = std_dev;
+ current_size_estimate = mean;
+
+ em->header.size
+ = htons (sizeof(struct GNUNET_NSE_ClientMessage));
+ em->header.type
+ = htons (GNUNET_MESSAGE_TYPE_NSE_ESTIMATE);
+ em->reserved = htonl (0);
+ em->size_estimate = mean - 0.5;
+ em->std_deviation = std_dev;
+ GNUNET_STATISTICS_set (stats,
+ "Current network size estimate",
+ (uint64_t) pow (2, mean - 0.5), GNUNET_NO);
+}
+
/**
* Handler for START message from client, triggers an
handle_start_message(void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
- if ((ntohs (message->size) != sizeof(struct GNUNET_MessageHeader))
- || (ntohs (message->type) != GNUNET_MESSAGE_TYPE_NSE_START))
- return;
-
+ struct GNUNET_NSE_ClientMessage em;
#if DEBUG_NSE
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "NSE",
- "Received START message from client\n");
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+ "Received START message from client\n");
#endif
GNUNET_SERVER_notification_context_add (nc, client);
+ setup_estimate_message (&em);
+ GNUNET_SERVER_notification_context_unicast (nc, client, &em.header, GNUNET_YES);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
+
+/**
+ * How long should we delay a message to go the given number of
+ * matching bits?
+ *
+ * @param matching_bits number of matching bits to consider
+ */
+static double
+get_matching_bits_delay (uint32_t matching_bits)
+{
+ /* Calculated as: S + f/2 - (f / pi) * (atan(x - p'))*/
+ // S is next_timestamp
+ // f is frequency (GNUNET_NSE_INTERVAL)
+ // x is matching_bits
+ // p' is current_size_estimate
+ return ((double) GNUNET_NSE_INTERVAL.rel_value / (double) 2)
+ - ((GNUNET_NSE_INTERVAL.rel_value / M_PI) * atan (matching_bits - current_size_estimate));
+}
+
+
+/**
+ * What delay randomization should we apply for a given number of matching bits?
+ *
+ * @param matching_bits number of matching bits
+ * @return random delay to apply
+ */
+static struct GNUNET_TIME_Relative
+get_delay_randomization (uint32_t matching_bits)
+{
+ struct GNUNET_TIME_Relative ret;
+
+ if (matching_bits == 0)
+ return GNUNET_TIME_UNIT_ZERO;
+ ret.rel_value = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ (uint32_t) (get_matching_bits_delay (matching_bits - 1) / (double) (hop_count_max + 1)));
+ return ret;
+}
+
+
+/**
+ * Get the number of matching bits that the given timestamp has to the given peer ID.
+ *
+ * @param timestamp time to generate key
+ * @param id peer identity to compare with
+ * @return number of matching bits
+ */
+static uint32_t
+get_matching_bits (struct GNUNET_TIME_Absolute timestamp,
+ const struct GNUNET_PeerIdentity *id)
+{
+ GNUNET_HashCode timestamp_hash;
+
+ GNUNET_CRYPTO_hash (×tamp.abs_value,
+ sizeof(timestamp.abs_value),
+ ×tamp_hash);
+ return GNUNET_CRYPTO_hash_matching_bits (×tamp_hash,
+ &id->hashPubKey);
+}
+
+
+/**
+ * Get the transmission delay that should be applied for a
+ * particular round.
+ *
+ * @param round_offset -1 for the previous round (random delay between 0 and 50ms)
+ * 0 for the current round (based on our proximity to time key)
+ * @return delay that should be applied
+ */
+static struct GNUNET_TIME_Relative
+get_transmit_delay (int round_offset)
+{
+ struct GNUNET_TIME_Relative ret;
+ struct GNUNET_TIME_Absolute tgt;
+ double dist_delay;
+ uint32_t matching_bits;
+
+ switch (round_offset)
+ {
+ case -1:
+ /* previous round is randomized between 0 and 50 ms */
+ ret.rel_value = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
+ 50);
+ return ret;
+ case 0:
+ /* current round is based on best-known matching_bits */
+ matching_bits = ntohl (size_estimate_messages[estimate_index].matching_bits);
+ dist_delay = get_matching_bits_delay (matching_bits);
+ dist_delay += get_delay_randomization (matching_bits).rel_value;
+ ret.rel_value = (uint64_t) dist_delay;
+ /* now consider round start time and add delay to it */
+ tgt = GNUNET_TIME_absolute_add (current_timestamp, ret);
+ return GNUNET_TIME_absolute_get_remaining (tgt);
+ }
+ GNUNET_break (0);
+ return GNUNET_TIME_UNIT_FOREVER_REL;
+}
+
+
+/**
+ * Task that triggers a NSE P2P transmission.
+ *
+ * @param cls the 'struct NSEPeerEntry'
+ * @param tc scheduler context
+ */
+static void
+transmit_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
/**
* Called when core is ready to send a message we asked for
* out to the destination.
* @return number of bytes written to buf
*/
static size_t
-transmit_ready(void *cls, size_t size, void *buf)
+transmit_ready (void *cls, size_t size, void *buf)
{
struct NSEPeerEntry *peer_entry = cls;
- char *cbuf = buf;
+ unsigned int idx;
- size_t msize;
peer_entry->th = NULL;
-#if DEBUG_NSE > 1
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "%s: transmit_ready called\n",
- GNUNET_i2s (&my_identity));
-#endif
- if (buf == NULL) /* client disconnected */
+ if (buf == NULL)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: transmit_ready called (disconnect)\n",
- GNUNET_i2s (&my_identity));
+ /* client disconnected */
return 0;
}
-
- if (peer_entry->pending_message == NULL)
+ GNUNET_assert (size >= sizeof (struct GNUNET_NSE_FloodMessage));
+#if DEBUG_NSE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Sending size estimate to `%s'\n",
+ GNUNET_i2s (&peer_entry->id));
+#endif
+ idx = estimate_index;
+ if (peer_entry->previous_round == GNUNET_YES)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: transmit_ready called (no message)\n",
- GNUNET_i2s (&my_identity));
- return 0;
+ idx = (idx + HISTORY_SIZE -1) % HISTORY_SIZE;
+ peer_entry->previous_round = GNUNET_NO;
+ peer_entry->transmit_task = GNUNET_SCHEDULER_add_delayed (get_transmit_delay (0),
+ &transmit_task,
+ peer_entry);
}
+ memcpy (buf,
+ &size_estimate_messages[idx],
+ sizeof (struct GNUNET_NSE_FloodMessage));
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages sent",
+ 1,
+ GNUNET_NO);
+ return sizeof (struct GNUNET_NSE_FloodMessage);
+}
- msize = ntohs (peer_entry->pending_message->size);
- if (msize <= size)
- memcpy (cbuf, peer_entry->pending_message, msize);
-#if DEBUG_NSE > 1
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: transmit_ready called (transmit %d bytes)\n",
- GNUNET_i2s (&my_identity), msize);
-#endif
- return msize;
+
+/**
+ * Task that triggers a NSE P2P transmission.
+ *
+ * @param cls the 'struct NSEPeerEntry'
+ * @param tc scheduler context
+ */
+static void
+transmit_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct NSEPeerEntry *peer_entry = cls;
+
+ peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
+ peer_entry->th
+ = GNUNET_CORE_notify_transmit_ready (coreAPI,
+ GNUNET_NO,
+ NSE_PRIORITY,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &peer_entry->id,
+ sizeof (struct GNUNET_NSE_FloodMessage),
+ &transmit_ready, peer_entry);
}
+
/**
- * We sent on our flood message or one that we received
- * which was validated and closer than ours. Update the
- * global list of recent messages and the average. Also
- * re-broadcast the message to any clients.
+ * We've sent on our flood message or one that we received which was
+ * validated and closer than ours. Update the global list of recent
+ * messages and the average. Also re-broadcast the message to any
+ * clients.
+ */
+static void
+update_network_size_estimate ()
+{
+ struct GNUNET_NSE_ClientMessage em;
+
+ setup_estimate_message (&em);
+ GNUNET_SERVER_notification_context_broadcast (nc,
+ &em.header,
+ GNUNET_YES);
+}
+
+
+/**
+ * Setup a flood message in our history array at the given
+ * slot offset for the given timestamp.
*
- * @param message the network flood message
+ * @param slot index to use
+ * @param ts timestamp to use
*/
static void
-update_network_size_estimate(struct GNUNET_NSE_FloodMessage *message)
+setup_flood_message (unsigned int slot,
+ struct GNUNET_TIME_Absolute ts)
{
- unsigned int i;
- unsigned int count;
- double average;
- double std_dev;
- double diff;
+ struct GNUNET_NSE_FloodMessage *fm;
+ uint32_t matching_bits;
+
+ matching_bits = get_matching_bits (ts, &my_identity);
+ fm = &size_estimate_messages[slot];
+ fm->header.size = htons (sizeof(struct GNUNET_NSE_FloodMessage));
+ fm->header.type = htons (GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD);
+ fm->hop_count = htonl (0);
+ fm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_NSE_SEND);
+ fm->purpose.size = htonl (sizeof(struct GNUNET_NSE_FloodMessage)
+ - sizeof (struct GNUNET_MessageHeader)
+ - sizeof (uint32_t)
+ - sizeof (struct GNUNET_CRYPTO_RsaSignature));
+ fm->matching_bits = htonl (matching_bits);
+ fm->timestamp = GNUNET_TIME_absolute_hton (ts);
+ fm->pkey = my_public_key;
+ fm->proof_of_work = my_proof;
+ GNUNET_CRYPTO_rsa_sign (my_private_key,
+ &fm->purpose,
+ &fm->signature);
+}
+
- size_estimates[estimate_index] = htonl (message->distance);
- memcpy (&size_estimate_messages[estimate_index], message,
- sizeof(struct GNUNET_NSE_FloodMessage));
+/**
+ * Schedule transmission for the given peer for the current round based
+ * on what we know about the desired delay.
+ *
+ * @param cls unused
+ * @param key hash of peer identity
+ * @param value the 'struct NSEPeerEntry'
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+schedule_current_round (void *cls,
+ const GNUNET_HashCode *key,
+ void *value)
+{
+ struct NSEPeerEntry *peer_entry = value;
+ struct GNUNET_TIME_Relative delay;
- count = 0;
- std_dev = 0.0;
- average = 0.0;
- for (i = 0; i < DEFAULT_HISTORY_SIZE; i++)
+ if (peer_entry->th != NULL)
{
- if (size_estimate_messages[i].distance != 0)
- {
-#if AVERAGE_SQUARE
- average += (1 << htonl (size_estimate_messages[i].distance));
-#else
- average += htonl (size_estimate_messages[i].distance);
-#endif
- count++;
- }
+ peer_entry->previous_round = GNUNET_NO;
+ return GNUNET_OK;
}
-
- if (count > 0)
+ if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
{
- average /= (double) count;
- for (i = 0; i < DEFAULT_HISTORY_SIZE; i++)
- {
- if (size_estimate_messages[i].distance != 0)
- {
-#if DEBUG_NSE
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: estimate %d %d\n", GNUNET_i2s(&my_identity), i, (1 << htonl(size_estimate_messages[i].distance)));
-#endif
-#if AVERAGE_SQUARE
- diff = average
- - (1 << htonl (size_estimate_messages[i].distance));
-#else
- diff = average - htonl (size_estimate_messages[i].distance);
-#endif
- std_dev += diff * diff;
- }
- }
- std_dev /= count;
- std_dev = sqrt (std_dev);
- current_estimate_message.header.size
- = htons (sizeof(struct GNUNET_NSE_ClientMessage));
- current_estimate_message.header.type
- = htons (GNUNET_MESSAGE_TYPE_NSE_ESTIMATE);
-#if AVERAGE_SQUARE
- current_estimate_message.size_estimate = average;
- current_estimate_message.std_deviation = std_dev;
-#else
- current_estimate_message.size_estimate = pow(2, average);
- current_estimate_message.std_deviation = pow(2, std_dev);
-#endif
- /* Finally, broadcast the current estimate to all clients */
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: sending estimate %f -- %f to client\n",
- GNUNET_i2s (&my_identity),
- average,
- std_dev);
-#endif
- GNUNET_SERVER_notification_context_broadcast (
- nc,
- ¤t_estimate_message.header,
- GNUNET_NO);
-
- GNUNET_STATISTICS_set (stats, "Current network size estimate",
- (uint64_t) average, GNUNET_NO);
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->previous_round = GNUNET_NO;
}
+ delay = get_transmit_delay ((peer_entry->previous_round == GNUNET_NO) ? -1 : 0);
+ peer_entry->transmit_task = GNUNET_SCHEDULER_add_delayed (delay,
+ &transmit_task,
+ peer_entry);
+ return GNUNET_OK;
}
-static void
-send_flood_message(void *cls, const struct GNUNET_SCHEDULER_TaskContext * tc);
/**
- * Schedule a flood message to be sent.
+ * Update our flood message to be sent (and our timestamps).
*
* @param cls unused
* @param tc context for this message
- *
- * This should be called on startup,
- * when a valid flood message is received (and
- * the next send flood message hasn't been
- * scheduled yet) and when this peer sends
- * a valid flood message. As such, there should
- * always be a message scheduled to be sent.
*/
static void
-schedule_flood_message(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+update_flood_message(void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- GNUNET_HashCode timestamp_hash;
- struct GNUNET_TIME_Absolute curr_time;
struct GNUNET_TIME_Relative offset;
- unsigned int matching_bits;
- double millisecond_offset;
-
- schedule_flood_task = GNUNET_SCHEDULER_NO_TASK;
- if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- return;
-
- GNUNET_assert(flood_task == GNUNET_SCHEDULER_NO_TASK);
+ unsigned int i;
- if (0 != GNUNET_TIME_absolute_get_remaining (next_timestamp).rel_value)
+ flood_task = GNUNET_SCHEDULER_NO_TASK;
+ offset = GNUNET_TIME_absolute_get_remaining (next_timestamp);
+ if (0 != offset.rel_value)
{
- GNUNET_break(0); /* Shouldn't ever happen! */
- schedule_flood_task
- = GNUNET_SCHEDULER_add_delayed (
- GNUNET_TIME_absolute_get_remaining (
- next_timestamp),
- &schedule_flood_message, NULL);
+ /* somehow run early, delay more */
+ flood_task
+ = GNUNET_SCHEDULER_add_delayed (offset,
+ &update_flood_message,
+ NULL);
+ return;
}
+ current_timestamp = next_timestamp;
+ next_timestamp = GNUNET_TIME_absolute_add (current_timestamp,
+ GNUNET_NSE_INTERVAL);
+ estimate_index = (estimate_index + 1) % HISTORY_SIZE;
+ setup_flood_message (estimate_index, current_timestamp);
+ hop_count_max = 0;
+ for (i=0;i<HISTORY_SIZE;i++)
+ hop_count_max = GNUNET_MAX (ntohl (size_estimate_messages[i].hop_count),
+ hop_count_max);
+ GNUNET_CONTAINER_multihashmap_iterate (peers,
+ &schedule_current_round,
+ NULL);
+ flood_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (next_timestamp),
+ &update_flood_message, NULL);
+}
- /* Get the current UTC time */
- curr_time = GNUNET_TIME_absolute_get ();
- /* Find the previous interval start time */
- previous_timestamp.abs_value = (curr_time.abs_value / GNUNET_NSE_INTERVAL)
- * GNUNET_NSE_INTERVAL;
- /* Find the next interval start time */
- next_timestamp.abs_value = previous_timestamp.abs_value + GNUNET_NSE_INTERVAL;
-#if DEBUG_NSE > 1
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: curr_time %lu, prev timestamp %lu, next timestamp %lu\n",
- GNUNET_i2s (&my_identity), curr_time.abs_value,
- previous_timestamp.abs_value, next_timestamp.abs_value);
-#endif
- GNUNET_CRYPTO_hash (&next_timestamp.abs_value,
- sizeof(next_timestamp.abs_value), ×tamp_hash);
- matching_bits = GNUNET_CRYPTO_hash_matching_bits (×tamp_hash,
- &my_identity.hashPubKey);
-
- flood_message.header.size = htons (sizeof(struct GNUNET_NSE_FloodMessage));
- flood_message.header.type = htons (GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD);
- flood_message.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_NSE_SEND);
- flood_message.purpose.size = htonl (sizeof(struct GNUNET_NSE_FloodMessage)
- - sizeof(struct GNUNET_MessageHeader) - sizeof(flood_message.signature));
- flood_message.distance = htonl (matching_bits);
- flood_message.timestamp = GNUNET_TIME_absolute_hton (next_timestamp);
- memcpy (&flood_message.pkey, &my_public_key,
- sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
- flood_message.proof_of_work = htonl (0);
- GNUNET_CRYPTO_rsa_sign (my_private_key, &flood_message.purpose,
- &flood_message.signature);
-
- /*S + f/2 - (f / pi) * (atan(x - p'))*/
-
- // S is next_timestamp
- // f is frequency (GNUNET_NSE_INTERVAL)
- // x is matching_bits
- // p' is current_size_estimate
- millisecond_offset = ((double) GNUNET_NSE_INTERVAL / (double) 2)
- - ((GNUNET_NSE_INTERVAL / M_PI) * atan (matching_bits
- - current_size_estimate));
-#if DEBUG_NSE > 1
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: id matches %d bits, offset is %lu\n\n",
- GNUNET_i2s (&my_identity), matching_bits,
- (uint64_t) millisecond_offset);
-#endif
- /* Stop initial call from incrementing */
- if (size_estimate_messages[estimate_index].distance != 0)
- estimate_index += 1;
-
- if (estimate_index >= DEFAULT_HISTORY_SIZE)
- estimate_index = 0;
-
- if (millisecond_offset < curr_time.abs_value - previous_timestamp.abs_value)
- offset.rel_value = 0;
- else
- offset.rel_value = (uint64_t) millisecond_offset + curr_time.abs_value
- - previous_timestamp.abs_value;
-#if DEBUG_NSE
- GNUNET_log (
- GNUNET_ERROR_TYPE_WARNING,
- "%s: %u bits match, %lu milliseconds to timestamp , sending flood in %lu\n",
- GNUNET_i2s (&my_identity), matching_bits,
- GNUNET_TIME_absolute_get_remaining (next_timestamp).rel_value,
- offset.rel_value);
-#endif
- flood_task = GNUNET_SCHEDULER_add_delayed (offset, &send_flood_message, NULL);
+/**
+ * Count the trailing zeroes in hash.
+ *
+ * @param hash
+ * @return the number of trailing zero bits.
+ */
+static unsigned int
+count_trailing_zeroes(const GNUNET_HashCode *hash)
+{
+ unsigned int hash_count;
+
+ hash_count = sizeof(GNUNET_HashCode) * 8;
+ while ((0 == GNUNET_CRYPTO_hash_get_bit(hash, hash_count)))
+ hash_count--;
+ return (sizeof(GNUNET_HashCode) * 8) - hash_count;
}
-#if VERIFY_CRYPTO
+
/**
* Check whether the given public key
* and integer are a valid proof of work.
*
* @param pkey the public key
* @param val the integer
- * @param want the number of trailing zeroes
*
* @return GNUNET_YES if valid, GNUNET_NO if not
*/
-static int check_proof_of_work(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey, uint64_t val, unsigned int want)
- {
-
- return GNUNET_YES;
- }
-
-/**
- * Count the trailing zeroes in hash.
- *
- * @param hash
- *
- * @return the number of trailing zero bits.
- */
-static unsigned int count_trailing_zeroes(GNUNET_HashCode *hash)
- {
- unsigned int hash_count;
+static int
+check_proof_of_work(const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey,
+ uint64_t val)
+{
+ char buf[sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sizeof(val)];
+ GNUNET_HashCode result;
+
+ memcpy (buf,
+ &val,
+ sizeof (val));
+ memcpy (&buf[sizeof(val)],
+ pkey,
+ sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
+ GNUNET_CRYPTO_hash (buf, sizeof (buf), &result);
+ return (count_trailing_zeroes (&result) >= NSE_WORK_REQUIRED) ? GNUNET_YES : GNUNET_NO;
+}
- hash_count = sizeof(GNUNET_HashCode) * 8;
- while ((0 == GNUNET_CRYPTO_hash_get_bit(hash, hash_count)))
- hash_count--;
- return (sizeof(GNUNET_HashCode) * 8) - hash_count;
- }
/**
- * Given a public key, find an integer such that
- * the hash of the key concatenated with the integer
- * has <param>want</param> trailing 0 bits.
+ * Given a public key, find an integer such that the hash of the key
+ * concatenated with the integer has NSE_WORK_REQUIRED trailing 0
+ * bits. FIXME: this is a synchronous function... bad
*
* @param pkey the public key
- * @param want the number of trailing 0 bits
- *
- * @return 64 bit number that satisfies the
- * requirements
- *
- * FIXME: use pointer and return GNUNET_YES or
- * GNUNET_NO in case no such number works?
+ * @return 64 bit number that satisfies the requirements
*/
-static uint64_t find_proof_of_work(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey, unsigned int want)
- {
- uint64_t counter;
- static char buf[sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sizeof(uint64_t)];
- unsigned int data_size;
- static GNUNET_HashCode result;
-
- data_size = sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sizeof(uint64_t);
- memcpy(buf, pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
- counter = 0;
- while (counter != (uint64_t)-1)
- {
- memcpy(&buf[sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)], &counter, sizeof(uint64_t));
- GNUNET_CRYPTO_hash(buf, data_size, &result);
- if (want == count_trailing_zeroes(&result)) /* Found good proof of work! */
+static uint64_t
+find_proof_of_work(const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey)
+{
+ uint64_t counter;
+ char buf[sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sizeof(uint64_t)];
+ GNUNET_HashCode result;
+
+ memcpy (&buf[sizeof(uint64_t)],
+ pkey,
+ sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
+ counter = 0;
+ while (counter != UINT64_MAX)
+ {
+ memcpy (buf,
+ &counter,
+ sizeof(uint64_t));
+ GNUNET_CRYPTO_hash (buf, sizeof (buf), &result);
+ if (NSE_WORK_REQUIRED <= count_trailing_zeroes(&result))
break;
- counter++;
- }
- if (counter < (uint64_t)-1)
- return counter; /* Found valid proof of work */
- else
- return 0; /* Did not find valid proof of work */
- }
+ counter++;
+ }
+ return counter;
+}
+
/**
* An incoming flood message has been received which claims
* @return GNUNET_YES if the message is verified
* GNUNET_NO if the key/signature don't verify
*/
-static int verify_message_crypto(struct GNUNET_NSE_FloodMessage *incoming_flood)
- {
- int ret;
- if (GNUNET_OK == (ret
- = GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_NSE_SEND,
- &incoming_flood->purpose,
- &incoming_flood->signature,
- &incoming_flood->pkey)))
- return GNUNET_YES;
-
- return GNUNET_NO;
- }
-#endif
+static int
+verify_message_crypto(const struct GNUNET_NSE_FloodMessage *incoming_flood)
+{
+ if (GNUNET_YES !=
+ check_proof_of_work (&incoming_flood->pkey,
+ incoming_flood->proof_of_work))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_NO;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_NSE_SEND,
+ &incoming_flood->purpose,
+ &incoming_flood->signature,
+ &incoming_flood->pkey))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_NO;
+ }
+ return GNUNET_YES;
+}
+
+
+/**
+ * Update transmissions for the given peer for the current round based
+ * on updated proximity information.
+ *
+ * @param cls peer entry to exclude from updates
+ * @param key hash of peer identity
+ * @param value the 'struct NSEPeerEntry'
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+update_flood_times (void *cls,
+ const GNUNET_HashCode *key,
+ void *value)
+{
+ struct NSEPeerEntry *exclude = cls;
+ struct NSEPeerEntry *peer_entry = value;
+ struct GNUNET_TIME_Relative delay;
+
+ if (peer_entry->th != NULL)
+ return GNUNET_OK; /* already active */
+ if (peer_entry == exclude)
+ return GNUNET_OK; /* trigger of the update */
+ if (peer_entry->previous_round == GNUNET_YES)
+ {
+ /* still stuck in previous round, no point to update, check that
+ we are active here though... */
+ GNUNET_break (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK);
+ return GNUNET_OK;
+ }
+ if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ delay = get_transmit_delay (0);
+ peer_entry->transmit_task = GNUNET_SCHEDULER_add_delayed (delay,
+ &transmit_task,
+ peer_entry);
+ return GNUNET_OK;
+}
+
/**
* Core handler for size estimate flooding messages.
*
*/
static int
-handle_p2p_size_estimate(void *cls, const struct GNUNET_PeerIdentity *peer,
+handle_p2p_size_estimate(void *cls,
+ const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_MessageHeader *message,
const struct GNUNET_TRANSPORT_ATS_Information *atsi)
{
- struct GNUNET_NSE_FloodMessage *incoming_flood;
- struct GNUNET_TIME_Absolute curr_time;
- uint64_t drift;
-
-#if DEBUG_NSE > 1
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "%s: received flood message!\n",
- GNUNET_i2s (&my_identity));
-#endif
- if (ntohs (message->size) != sizeof(struct GNUNET_NSE_FloodMessage))
+ const struct GNUNET_NSE_FloodMessage *incoming_flood;
+ struct GNUNET_TIME_Absolute ts;
+ struct NSEPeerEntry *peer_entry;
+ uint32_t matching_bits;
+ unsigned int idx;
+
+ incoming_flood = (const struct GNUNET_NSE_FloodMessage *) message;
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages received",
+ 1,
+ GNUNET_NO);
+ matching_bits = ntohl (incoming_flood->matching_bits);
+ peer_entry = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (NULL == peer_entry)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "%s: bad message size!\n",
- GNUNET_i2s (&my_identity));
- return GNUNET_NO;
+ GNUNET_break (0);
+ return GNUNET_OK;
}
-
- GNUNET_STATISTICS_update (stats, "# flood messages received", 1, GNUNET_NO);
- incoming_flood = (struct GNUNET_NSE_FloodMessage *) message;
- if (ntohl (incoming_flood->distance)
- <= ntohl (size_estimate_messages[estimate_index].distance)) /* Not closer than our most recent message */
+ ts = GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp);
+ if (ts.abs_value == current_timestamp.abs_value)
+ idx = estimate_index;
+ else if (ts.abs_value == current_timestamp.abs_value - GNUNET_NSE_INTERVAL.rel_value)
+ idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
+ else if (ts.abs_value == next_timestamp.abs_value - GNUNET_NSE_INTERVAL.rel_value)
{
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: distance %d not greater than %d, discarding\n",
- GNUNET_i2s (&my_identity), ntohl (incoming_flood->distance),
- ntohl (size_estimate_messages[estimate_index].distance));
-#endif
- GNUNET_STATISTICS_update (stats,
- "# flood messages discarded (had closer)", 1,
- GNUNET_NO);
+ if (GNUNET_YES !=
+ verify_message_crypto (incoming_flood))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ /* FIXME: keep in special 'future' buffer until next round starts for us! */
+ GNUNET_break (0); /* not implemented */
return GNUNET_OK;
}
-
- curr_time = GNUNET_TIME_absolute_get ();
- if (curr_time.abs_value
- > GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp).abs_value)
- drift = curr_time.abs_value
- - GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp).abs_value;
else
- drift = GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp).abs_value
- - curr_time.abs_value;
-
- if (drift > GNUNET_NSE_DRIFT_TOLERANCE)
{
- GNUNET_STATISTICS_update (
- stats,
- "# flood messages discarded (clock skew too high)",
- 1, GNUNET_NO);
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages discarded (clock skew too large)",
+ 1,
+ GNUNET_NO);
+ GNUNET_break_op (0);
return GNUNET_OK;
}
-
-#if VERIFY_CRYPTO
- if (GNUNET_YES != verify_message_crypto(incoming_flood))
+ if (0 == (memcmp (peer, &my_identity, sizeof(struct GNUNET_PeerIdentity))))
+ {
+ /* send to self, update our own estimate IF this also comes from us! */
+ if (0 == memcmp (&incoming_flood->pkey,
+ &my_public_key,
+ sizeof (my_public_key)))
+ update_network_size_estimate ();
+ return GNUNET_OK;
+ }
+ if (matching_bits >= ntohl (size_estimate_messages[idx].matching_bits))
+ {
+ /* cancel transmission from us to this peer for this round */
+ if (idx == estimate_index)
+ {
+ if (peer_entry->previous_round == GNUNET_NO)
+ {
+ /* cancel any activity for current round */
+ if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->previous_round = GNUNET_NO;
+ }
+ if (peer_entry->th != NULL)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (peer_entry->th);
+ peer_entry->th = NULL;
+ }
+ }
+ }
+ else
+ {
+ /* cancel previous round only */
+ peer_entry->previous_round = GNUNET_NO;
+ }
+
+ }
+ if (matching_bits <= ntohl (size_estimate_messages[idx].matching_bits))
{
+ /* Not closer than our most recent message, no need to do work here */
GNUNET_STATISTICS_update (stats,
- "# flood messages discarded (bad crypto)",
- 1, GNUNET_NO);
+ "# flood messages ignored (had closer already)",
+ 1,
+ GNUNET_NO);
return GNUNET_OK;
}
-#endif
-
- /* Have a new, better size estimate! */
- update_network_size_estimate (incoming_flood);
-
- if (flood_task != GNUNET_SCHEDULER_NO_TASK)
+ if (GNUNET_YES !=
+ verify_message_crypto (incoming_flood))
{
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "%s: received closer message, canceling my flood task!\n", GNUNET_i2s(&my_identity));
-#endif
- GNUNET_SCHEDULER_cancel (flood_task);
- flood_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
-
- /** Commenting out prevents forwarding of messages */
-#if DO_FORWARD
- GNUNET_SCHEDULER_add_now(&send_flood_message, &size_estimate_messages[estimate_index]);
-#endif
- if (schedule_flood_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (schedule_flood_task);
-
- schedule_flood_task
- = GNUNET_SCHEDULER_add_delayed (
- GNUNET_TIME_absolute_get_remaining (
- next_timestamp),
- &schedule_flood_message, NULL);
-
+ size_estimate_messages[idx] = *incoming_flood;
+ size_estimate_messages[idx].hop_count = htonl (ntohl (incoming_flood->hop_count) + 1);
+ hop_count_max = GNUNET_MAX (ntohl (incoming_flood->hop_count) + 1,
+ hop_count_max);
+
+ /* have a new, better size estimate, inform clients */
+ update_network_size_estimate ();
+
+ /* flood to rest */
+ GNUNET_CONTAINER_multihashmap_iterate (peers,
+ &update_flood_times,
+ peer_entry);
return GNUNET_OK;
}
-/**
- * Send a flood message.
- *
- * If we've gotten here, it means either we haven't received
- * a network size estimate message closer than ours, or
- * we need to forward a message we received which was closer
- * than ours.
- */
-static void
-send_flood_message(void *cls, const struct GNUNET_SCHEDULER_TaskContext * tc)
-{
- struct NSEPeerEntry *peer_entry;
- struct GNUNET_NSE_FloodMessage *to_send;
-
- if (cls == NULL) /* Means we are sending our OWN flood message */
- to_send = &flood_message;
- else
- /* Received a message from another peer that should be forwarded */
- to_send = (struct GNUNET_NSE_FloodMessage *) cls;
- flood_task = GNUNET_SCHEDULER_NO_TASK;
- if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- return;
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: my time has come, sending flood message of size %d!\n",
- GNUNET_i2s (&my_identity), ntohs (to_send->header.size));
-#endif
- peer_entry = peers_head;
-
- while (peer_entry != NULL)
- {
- peer_entry->pending_message = &to_send->header;
- peer_entry->th
- = GNUNET_CORE_notify_transmit_ready (
- coreAPI,
- GNUNET_NO,
- DEFAULT_NSE_PRIORITY,
- GNUNET_TIME_absolute_get_remaining (
- next_timestamp),
- &peer_entry->id,
- ntohs (to_send->header.size),
- &transmit_ready, peer_entry);
- if (peer_entry->th == NULL)
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: transmit handle is null!\n", GNUNET_i2s (&my_identity));
-#if DEBUG_NSE > 1
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: Sending flood message (distance %d) to %s!\n",
- GNUNET_i2s (&my_identity), ntohl (to_send->distance),
- GNUNET_h2s (&peer_entry->id.hashPubKey));
-#endif
- peer_entry = peer_entry->next;
- }
-
- if (cls == NULL) /* Need to update our size estimate */
- {
- update_network_size_estimate (to_send);
- GNUNET_STATISTICS_update (stats, "# flood messages sent", 1, GNUNET_NO);
- }
- else
- GNUNET_STATISTICS_update (stats, "# flood messages forwarded", 1, GNUNET_NO);
-
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "%s: scheduling schedule_flood_message in %lu\n",
- GNUNET_i2s (&my_identity),
- GNUNET_TIME_absolute_get_remaining (next_timestamp).rel_value);
-#endif
- if (schedule_flood_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (schedule_flood_task);
-
- schedule_flood_task
- = GNUNET_SCHEDULER_add_delayed (
- GNUNET_TIME_absolute_get_remaining (
- next_timestamp),
- &schedule_flood_message, NULL);
-}
/**
* Method called whenever a peer connects.
{
struct NSEPeerEntry *peer_entry;
- if (0 == (memcmp (peer, &my_identity, sizeof(struct GNUNET_PeerIdentity))))
- return; /* Do not connect to self... */
-
peer_entry = GNUNET_malloc(sizeof(struct NSEPeerEntry));
- memcpy (&peer_entry->id, peer, sizeof(struct GNUNET_PeerIdentity));
- GNUNET_CONTAINER_DLL_insert(peers_head, peers_tail, peer_entry);
+ peer_entry->id = *peer;
+ GNUNET_CONTAINER_multihashmap_put (peers,
+ &peer->hashPubKey,
+ peer_entry,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
+ peer_entry->transmit_task = GNUNET_SCHEDULER_add_delayed (get_transmit_delay (-1),
+ &transmit_task,
+ peer_entry);
}
+
/**
* Method called whenever a peer disconnects.
*
{
struct NSEPeerEntry *pos;
- if (0 == (memcmp (peer, &my_identity, sizeof(struct GNUNET_PeerIdentity))))
- return; /* Ignore disconnect from self... */
-
- pos = peers_head;
- while ((NULL != pos) && (0 != memcmp (&pos->id, peer,
- sizeof(struct GNUNET_PeerIdentity))))
- pos = pos->next;
-
- if (pos == NULL)
+ pos = GNUNET_CONTAINER_multihashmap_get (peers,
+ &peer->hashPubKey);
+ if (NULL == pos)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Received disconnect before connect!\n");
- GNUNET_break(0); /* Should never receive a disconnect message for a peer we don't know about... */
+ GNUNET_break (0);
return;
}
-
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (peers,
+ &peer->hashPubKey,
+ pos));
+ if (pos->transmit_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (pos->transmit_task);
if (pos->th != NULL)
GNUNET_CORE_notify_transmit_ready_cancel (pos->th);
- GNUNET_CONTAINER_DLL_remove(peers_head, peers_tail, pos);
GNUNET_free(pos);
}
-/**
- * A client disconnected. Remove it from the
- * global DLL of clients.
- *
- * @param cls closure, NULL
- * @param client identification of the client
- */
-static void
-handle_client_disconnect(void *cls, struct GNUNET_SERVER_Client* client)
-{
- struct ClientListEntry *cle;
-
- while (NULL != (cle = cle_head))
- cle = cle->next;
-
- if (cle != NULL)
- {
- GNUNET_SERVER_client_drop (cle->client);
- GNUNET_CONTAINER_DLL_remove(cle_head,
- cle_tail,
- cle);
- GNUNET_free(cle);
- }
- if (coreAPI != NULL)
- {
- GNUNET_CORE_disconnect (coreAPI);
- coreAPI = NULL;
- }
-}
/**
* Task run during shutdown.
* @param tc unused
*/
static void
-shutdown_task(void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+shutdown_task(void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct ClientListEntry *cle;
-
if (flood_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (flood_task);
- GNUNET_SERVER_notification_context_destroy (nc);
- nc = NULL;
- while (NULL != (cle = cle_head))
{
- GNUNET_SERVER_client_drop (cle->client);
- GNUNET_CONTAINER_DLL_remove (cle_head,
- cle_tail,
- cle);
- GNUNET_free (cle);
+ GNUNET_SCHEDULER_cancel (flood_task);
+ flood_task = GNUNET_SCHEDULER_NO_TASK;
}
-
+ GNUNET_SERVER_notification_context_destroy (nc);
+ nc = NULL;
if (coreAPI != NULL)
{
GNUNET_CORE_disconnect (coreAPI);
coreAPI = NULL;
}
-
if (stats != NULL)
- GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
-
+ {
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ stats = NULL;
+ }
}
+
/**
* Called on core init/fail.
*
const struct GNUNET_PeerIdentity *identity,
const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
{
- struct GNUNET_TIME_Absolute curr_time;
+ struct GNUNET_TIME_Absolute now;
+ struct GNUNET_TIME_Absolute prev_time;
+ unsigned int i;
+
if (server == NULL)
{
#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s: Connection to core FAILED!\n",
- "nse", GNUNET_i2s (identity));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Connection to core FAILED!\n");
#endif
GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
return;
}
-
- /* Copy our identity so we can use it */
- memcpy (&my_identity, identity, sizeof(struct GNUNET_PeerIdentity));
- /* Copy our public key for inclusion in flood messages */
- memcpy (&my_public_key, publicKey,
- sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
-
- if (flood_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (flood_task);
-
- /* Get the current UTC time */
- curr_time = GNUNET_TIME_absolute_get ();
- /* Find the previous interval start time */
- previous_timestamp.abs_value = (curr_time.abs_value / GNUNET_NSE_INTERVAL)
- * GNUNET_NSE_INTERVAL;
- /* Find the next interval start time */
- next_timestamp.abs_value = previous_timestamp.abs_value + GNUNET_NSE_INTERVAL;
-
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "%s: Core connection initialized, I am peer: %s, scheduling flood task in %lu\n", "nse",
- GNUNET_i2s (identity), GNUNET_TIME_absolute_get_remaining(next_timestamp));
-#endif
- /* FIXME: In production, we'd likely want to do this immediately, but in test-beds it causes stupid behavior */
- if (schedule_flood_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (schedule_flood_task);
- schedule_flood_task
- = GNUNET_SCHEDULER_add_delayed (
- GNUNET_TIME_absolute_get_remaining (
- next_timestamp),
- &schedule_flood_message, NULL);
-
- GNUNET_SERVER_notification_context_broadcast (
- nc,
- ¤t_estimate_message.header,
- GNUNET_NO);
+ my_identity = *identity;
+ my_public_key = *publicKey;
+
+ now = GNUNET_TIME_absolute_get ();
+ current_timestamp.abs_value = (now.abs_value / GNUNET_NSE_INTERVAL.rel_value) * GNUNET_NSE_INTERVAL.rel_value;
+ next_timestamp.abs_value = current_timestamp.abs_value + GNUNET_NSE_INTERVAL.rel_value;
+
+ for (i=0;i<HISTORY_SIZE;i++)
+ {
+ prev_time.abs_value = next_timestamp.abs_value - (HISTORY_SIZE - i - 1) * GNUNET_NSE_INTERVAL.rel_value;
+ setup_flood_message (i, prev_time);
+ }
+ estimate_index = HISTORY_SIZE - 1;
+ flood_task
+ = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (next_timestamp),
+ &update_flood_message, NULL);
+ my_proof = find_proof_of_work (&my_public_key);
}
+
/**
* Handle network size estimate clients.
*
const struct GNUNET_CONFIGURATION_Handle *c)
{
char *keyfile;
+
static const struct GNUNET_SERVER_MessageHandler handlers[] =
{
- { &handle_start_message, NULL, GNUNET_MESSAGE_TYPE_NSE_START, 0 },
- { NULL, NULL, 0, 0 } };
-
+ { &handle_start_message, NULL, GNUNET_MESSAGE_TYPE_NSE_START, sizeof (struct GNUNET_MessageHeader) },
+ { NULL, NULL, 0, 0 }
+ };
static const struct GNUNET_CORE_MessageHandler core_handlers[] =
{
- { &handle_p2p_size_estimate, GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD, 0 },
- { NULL, 0, 0 } };
-
+ { &handle_p2p_size_estimate, GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD, sizeof (struct GNUNET_NSE_FloodMessage) },
+ { NULL, 0, 0 }
+ };
cfg = c;
-
- if (GNUNET_OK
- != GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
- &keyfile))
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (cfg,
+ "GNUNETD", "HOSTKEY",
+ &keyfile))
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _
- ("NSE service is lacking key configuration settings. Exiting.\n"));
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _ ("NSE service is lacking key configuration settings. Exiting.\n"));
GNUNET_SCHEDULER_shutdown ();
return;
}
-
my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
GNUNET_free (keyfile);
if (my_private_key == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("NSE Service could not access hostkey. Exiting.\n"));
+ _("NSE service could not access hostkey. Exiting.\n"));
GNUNET_SCHEDULER_shutdown ();
return;
}
-
GNUNET_SERVER_add_handlers (server, handlers);
- nc = GNUNET_SERVER_notification_context_create (server, 16);
- GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
-
- flood_task = GNUNET_SCHEDULER_NO_TASK;
- /** Connect to core service and register core handlers */
+ nc = GNUNET_SERVER_notification_context_create (server, 1);
+ /* Connect to core service and register core handlers */
coreAPI = GNUNET_CORE_connect (cfg, /* Main configuration */
- DEFAULT_CORE_QUEUE_SIZE, /* queue size */
- NULL, /* Closure passed to functions */
- &core_init, /* Call core_init once connected */
- &handle_core_connect, /* Handle connects */
- &handle_core_disconnect, /* Handle disconnects */
- NULL, /* Do we care about "status" updates? */
- NULL, /* Don't want notified about all incoming messages */
- GNUNET_NO, /* For header only inbound notification */
- NULL, /* Don't want notified about all outbound messages */
- GNUNET_NO, /* For header only outbound notification */
- core_handlers); /* Register these handlers */
-
+ CORE_QUEUE_SIZE, /* queue size */
+ NULL, /* Closure passed to functions */
+ &core_init, /* Call core_init once connected */
+ &handle_core_connect, /* Handle connects */
+ &handle_core_disconnect, /* Handle disconnects */
+ NULL, /* Do we care about "status" updates? */
+ NULL, /* Don't want notified about all incoming messages */
+ GNUNET_NO, /* For header only inbound notification */
+ NULL, /* Don't want notified about all outbound messages */
+ GNUNET_NO, /* For header only outbound notification */
+ core_handlers); /* Register these handlers */
if (coreAPI == NULL)
{
GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
return;
}
-
stats = GNUNET_STATISTICS_create ("NSE", cfg);
-
- increment
- = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
- GNUNET_NSE_INTERVAL
- / (sizeof(GNUNET_HashCode) * 8));
- /* Set we have no idea defaults for network size estimate */
- current_size_estimate = 0.0;
- current_std_dev = NAN;
- size_estimates[estimate_index] = 0;
- current_estimate_message.header.size
- = htons (sizeof(struct GNUNET_NSE_ClientMessage));
- current_estimate_message.header.type
- = htons (GNUNET_MESSAGE_TYPE_NSE_ESTIMATE);
- current_estimate_message.size_estimate = current_size_estimate;
- current_estimate_message.std_deviation = current_std_dev;
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
- NULL);
}
+
/**
* The main function for the statistics service.
*
int
main(int argc, char * const *argv)
{
- return (GNUNET_OK == GNUNET_SERVICE_run (argc, argv, "nse",
+ return (GNUNET_OK == GNUNET_SERVICE_run (argc, argv,
+ "gnunet-service-nse",
GNUNET_SERVICE_OPTION_NONE, &run,
NULL)) ? 0 : 1;
}
-/* End of gnunet-service-nse.c */
+/* end of gnunet-service-nse.c */
projects / oweals / gnunet.git / commitdiff