/*
- 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.
*/
#include "platform.h"
-#include "gnunet_client_lib.h"
+#include <math.h>
+#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
-#include "gnunet_container_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_signatures.h"
-#include "gnunet_service_lib.h"
-#include "gnunet_server_lib.h"
+#include "gnunet_statistics_service.h"
#include "gnunet_core_service.h"
-#include "gnunet_time_lib.h"
#include "gnunet_nse_service.h"
#include "nse.h"
-#define DEFAULT_HISTORY_SIZE 10
+/**
+ * Should messages be delayed randomly? This option should be set to
+ * GNUNET_NO only for experiments, not in production. It should also
+ * be removed once the initial experiments have been completed.
+ */
+#define USE_RANDOM_DELAYS GNUNET_YES
-#define DEFAULT_CORE_QUEUE_SIZE 32
+/**
+ * Should we generate a histogram with the time stamps of when we received
+ * NSE messages to disk? (for performance evaluation only, not useful in
+ * production). The associated code should also probably be removed
+ * once we're done with experiments.
+ */
+#define ENABLE_HISTOGRAM GNUNET_NO
-#define DEFAULT_NSE_PRIORITY 0
+/**
+ * Over how many values do we calculate the weighted average?
+ */
+#define HISTORY_SIZE 64
/**
- * Entry in the list of clients which
- * should be notified upon a new network
- * size estimate calculation.
+ * Message priority to use.
*/
-struct ClientListEntry
+#define NSE_PRIORITY 5
+
+#if FREEBSD
+#define log2(a) (log(a)/log(2))
+#endif
+
+/**
+ * Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.
+ */
+static unsigned long long nse_work_required;
+
+/**
+ * Interval for sending network size estimation flood requests.
+ */
+static struct GNUNET_TIME_Relative gnunet_nse_interval;
+
+/**
+ * Interval between proof find runs.
+ */
+static struct GNUNET_TIME_Relative proof_find_delay;
+
+#if ENABLE_HISTOGRAM
+/**
+ * Handle for writing when we received messages to disk.
+ */
+static struct GNUNET_BIO_WriteHandle *wh;
+#endif
+
+
+/**
+ * Per-peer information.
+ */
+struct NSEPeerEntry
{
+
+ /**
+ * Core handle for sending messages to this peer.
+ */
+ struct GNUNET_CORE_TransmitHandle *th;
+
+ /**
+ * What is the identity of the peer?
+ */
+ 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? GNUNET_YES if the previous round has
+ * been taken care of.
+ */
+ int previous_round;
+
+#if ENABLE_HISTOGRAM
+
/**
- * Pointer to previous entry
+ * Amount of messages received from this peer on this round.
*/
- struct ClientListEntry *prev;
+ unsigned int received_messages;
/**
- * Pointer to next entry
+ * Amount of messages transmitted to this peer on this round.
*/
- struct ClientListEntry *next;
+ unsigned int transmitted_messages;
/**
- * Client to notify.
+ * Which size did we tell the peer the network is?
*/
- struct GNUNET_SERVER_Client *client;
+ unsigned int last_transmitted_size;
+
+#endif
+
};
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
/**
- * 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 GNUNET_PACKED;
/**
- * 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 GNUNET_PACKED;
+
+ /**
+ * 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 GNUNET_PACKED;
+
+ /**
+ * Signature (over range specified in purpose).
+ */
+ struct GNUNET_CRYPTO_RsaSignature signature;
};
+GNUNET_NETWORK_STRUCT_END
/**
* Handle to our current configuration.
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Handle to the core service.
+ * Handle to the statistics service.
*/
-static struct GNUNET_CORE_Handle *coreAPI;
+static struct GNUNET_STATISTICS_Handle *stats;
/**
- * Head of global list of peers.
+ * Handle to the core service.
*/
-static struct NSEPeerEntry *peers_head;
+static struct GNUNET_CORE_Handle *coreAPI;
/**
- * Head of global list of clients.
+ * Map of all connected peers.
*/
-static struct NSEPeerEntry *peers_tail;
+static struct GNUNET_CONTAINER_MultiHashMap *peers;
/**
- * Head of global list of clients.
+ * The current network size estimate. Number of bits matching on
+ * average thus far.
*/
-static struct ClientListEntry *cle_head;
+static double current_size_estimate;
/**
- * Tail of global list of clients.
+ * The standard deviation of the last HISTORY_SIZE network
+ * size estimates.
*/
-static struct ClientListEntry *cle_tail;
+static double current_std_dev = NAN;
/**
- * The current network size estimate.
- * Number of bits matching on average
- * thus far.
+ * Current hop counter estimate (estimate for network diameter).
*/
-static double current_size_estimate;
+static uint32_t hop_count_max;
/**
- * The standard deviation of the last
- * DEFAULT_HISTORY_SIZE network size estimates.
+ * Message for the next round, if we got any.
*/
-static double current_std_dev;
+static struct GNUNET_NSE_FloodMessage next_message;
/**
- * Array of the last DEFAULT_HISTORY_SIZE
- * network size estimates (matching bits, actually).
+ * Array of recent size estimate messages.
*/
-static unsigned int size_estimates[DEFAULT_HISTORY_SIZE];
+static struct GNUNET_NSE_FloodMessage size_estimate_messages[HISTORY_SIZE];
/**
- * Array of size estimate messages.
+ * Index of most recent estimate.
*/
-static struct GNUNET_NSE_FloodMessage size_estimate_messages[DEFAULT_HISTORY_SIZE];
+static unsigned int estimate_index;
/**
- * Index of most recent estimate.
+ * Number of valid entries in the history.
*/
-static unsigned int estimate_index;
+static unsigned int estimate_count;
/**
- * 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.
+ * Task scheduled to compute our proof.
*/
-static GNUNET_SCHEDULER_TaskIdentifier schedule_flood_task;
+static GNUNET_SCHEDULER_TaskIdentifier proof_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 uint64_t my_proof;
+
+
+/**
+ * Initialize a message to clients with the current network
+ * size estimate.
+ *
+ * @param em message to fill in
*/
-static struct GNUNET_NSE_FloodMessage flood_message;
+static void
+setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
+{
+ unsigned int i;
+ unsigned int j;
+ double mean;
+ double sum;
+ double std_dev;
+ double variance;
+ double val;
+ double nsize;
+
+#define WEST 1
+ /* Weighted incremental algorithm for stddev according to West (1979) */
+#if WEST
+ double sumweight;
+ double weight;
+ double q;
+ double r;
+ double temp;
+
+ mean = 0.0;
+ sum = 0.0;
+ sumweight = 0.0;
+ variance = 0.0;
+ for (i = 0; i < estimate_count; i++)
+ {
+ j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
+ val = htonl (size_estimate_messages[j].matching_bits);
+ weight = estimate_count + 1 - i;
+
+ temp = weight + sumweight;
+ q = val - mean;
+ r = q * weight / temp;
+ mean += r;
+ sum += sumweight * q * r;
+ sumweight = temp;
+ }
+ if (estimate_count > 0)
+ variance = (sum / sumweight) * estimate_count / (estimate_count - 1.0);
+#else
+ /* trivial version for debugging */
+ double vsq;
+
+ /* non-weighted trivial version */
+ sum = 0.0;
+ vsq = 0.0;
+ variance = 0.0;
+ mean = 0.0;
+
+ for (i = 0; i < estimate_count; i++)
+ {
+ j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
+ val = htonl (size_estimate_messages[j].matching_bits);
+ sum += val;
+ vsq += val * val;
+ }
+ if (0 != estimate_count)
+ {
+ mean = sum / estimate_count;
+ variance = (vsq - mean * sum) / (estimate_count - 1.0); // terrible for numerical stability...
+ }
+#endif
+ if (variance >= 0)
+ std_dev = sqrt (variance);
+ else
+ std_dev = variance; /* must be infinity due to estimate_count == 0 */
+ 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->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
+ double se = mean - 0.332747;
+ nsize = log2 (GNUNET_CONTAINER_multihashmap_size (peers) + 1);
+ em->size_estimate = GNUNET_hton_double (GNUNET_MAX (se, nsize));
+ em->std_deviation = GNUNET_hton_double (std_dev);
+ GNUNET_STATISTICS_set (stats, "# nodes in the network (estimate)",
+ (uint64_t) pow (2, mean - 1.0 / 3.0), GNUNET_NO);
+}
+
/**
* Handler for START message from client, triggers an
* @param message the message received
*/
static void
-handle_start_message (void *cls,
- struct GNUNET_SERVER_Client *client,
+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);
- GNUNET_SERVER_receive_done(client, GNUNET_OK);
+ 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 (ignored in return value)
+ // f is frequency (gnunet_nse_interval)
+ // x is matching_bits
+ // p' is current_size_estimate
+ return ((double) gnunet_nse_interval.rel_value / (double) 2.0) -
+ ((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)
+{
+#if USE_RANDOM_DELAYS
+ struct GNUNET_TIME_Relative ret;
+ uint32_t i;
+ double d;
+
+ d = get_matching_bits_delay (matching_bits);
+ i = (uint32_t) (d / (double) (hop_count_max + 1));
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Randomizing flood using latencies up to %u ms\n",
+ (unsigned int) i);
+#endif
+ ret.rel_value = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, i + 1);
+ return ret;
+#else
+ return GNUNET_TIME_UNIT_ZERO;
+#endif
+}
+
+
+/**
+ * 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 */
+#if USE_RANDOM_DELAYS
+ ret.rel_value = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, 50);
+#else
+ ret = GNUNET_TIME_UNIT_ZERO;
+#endif
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting previous round behind schedule in %llu ms\n",
+ (unsigned long long) ret.rel_value);
+#endif
+ 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;
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "For round %llu, delay for %u matching bits is %llu ms\n",
+ (unsigned long long) current_timestamp.abs_value,
+ (unsigned int) matching_bits,
+ (unsigned long long) ret.rel_value);
+#endif
+ /* 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_cb (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
/**
* Called when core is ready to send a message we asked for
* out to the destination.
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 (buf == NULL) /* client disconnected */
+ if (buf == NULL)
+ {
+ /* client disconnected */
return 0;
-
- if (peer_entry->pending_message == NULL)
+ }
+ GNUNET_assert (size >= sizeof (struct GNUNET_NSE_FloodMessage));
+ idx = estimate_index;
+ if (peer_entry->previous_round == GNUNET_NO)
+ {
+ idx = (idx + HISTORY_SIZE - 1) % HISTORY_SIZE;
+ peer_entry->previous_round = GNUNET_YES;
+ peer_entry->transmit_task =
+ GNUNET_SCHEDULER_add_delayed (get_transmit_delay (0), &transmit_task_cb,
+ peer_entry);
+ }
+ if ((ntohl (size_estimate_messages[idx].hop_count) == 0) &&
+ (GNUNET_SCHEDULER_NO_TASK != proof_task))
+ {
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages not generated (no proof yet)",
+ 1, GNUNET_NO);
+ return 0;
+ }
+ if (ntohs (size_estimate_messages[idx].header.size) == 0)
+ {
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages not generated (lack of history)",
+ 1, GNUNET_NO);
return 0;
+ }
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "In round %llu, sending to `%s' estimate with %u bits\n",
+ (unsigned long long)
+ GNUNET_TIME_absolute_ntoh (size_estimate_messages[idx].
+ timestamp).abs_value,
+ GNUNET_i2s (&peer_entry->id),
+ (unsigned int) ntohl (size_estimate_messages[idx].matching_bits));
+#endif
+ if (ntohl (size_estimate_messages[idx].hop_count) == 0)
+ GNUNET_STATISTICS_update (stats, "# flood messages started", 1, GNUNET_NO);
+ GNUNET_STATISTICS_update (stats, "# flood messages transmitted", 1,
+ GNUNET_NO);
+#if ENABLE_HISTOGRAM
+ peer_entry->transmitted_messages++;
+ peer_entry->last_transmitted_size =
+ ntohl(size_estimate_messages[idx].matching_bits);
+#endif
+ memcpy (buf, &size_estimate_messages[idx],
+ sizeof (struct GNUNET_NSE_FloodMessage));
+ return sizeof (struct GNUNET_NSE_FloodMessage);
+}
- msize = ntohs(peer_entry->pending_message->size);
- if (msize <= size)
- memcpy(cbuf, peer_entry->pending_message, msize);
- return msize;
+/**
+ * Task that triggers a NSE P2P transmission.
+ *
+ * @param cls the 'struct NSEPeerEntry'
+ * @param tc scheduler context
+ */
+static void
+transmit_task_cb (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct NSEPeerEntry *peer_entry = cls;
+
+ peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (NULL == peer_entry->th);
+ 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'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);
}
+
/**
- * 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.
+ * 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)
+static void
+setup_flood_message (unsigned int slot, struct GNUNET_TIME_Absolute ts)
{
- unsigned int i;
- unsigned int count;
- double average;
+ 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;
+ if (nse_work_required > 0)
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_rsa_sign (my_private_key, &fm->purpose,
+ &fm->signature));
+ else
+ memset (&fm->signature, 0, sizeof (fm->signature));
+}
- size_estimates[estimate_index] = htons(message->distance);
- memcpy(&size_estimate_messages[estimate_index], message, sizeof(struct GNUNET_NSE_FloodMessage));
- count = 0;
- for (i = 0; i < DEFAULT_HISTORY_SIZE; i++)
- {
- if (size_estimate_messages[i].distance != 0)
- {
- average += 1 << htons(size_estimate_messages[i].distance);
- count++;
- }
- }
- average /= (double)count;
- current_estimate_message.size_estimate = average;
- /* Finally, broadcast the current estimate to all clients */
- GNUNET_SERVER_notification_context_broadcast (nc,
- ¤t_estimate_message.header,
- GNUNET_NO);
+/**
+ * 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;
+
+ if (peer_entry->th != NULL)
+ {
+ peer_entry->previous_round = GNUNET_NO;
+ return GNUNET_OK;
+ }
+ if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->previous_round = GNUNET_NO;
+ }
+#if ENABLE_HISTOGRAM
+ if (peer_entry->received_messages > 1)
+ GNUNET_STATISTICS_update(stats, "# extra messages",
+ peer_entry->received_messages - 1, GNUNET_NO);
+ peer_entry->transmitted_messages = 0;
+ peer_entry->last_transmitted_size = 0;
+ peer_entry->received_messages = 0;
+#endif
+ delay =
+ get_transmit_delay ((peer_entry->previous_round == GNUNET_NO) ? -1 : 0);
+ peer_entry->transmit_task =
+ GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, 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;
- struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
- unsigned int matching_bits;
- double millisecond_offset;
+ unsigned int i;
- schedule_flood_task = GNUNET_SCHEDULER_NO_TASK;
- if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ flood_task = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ offset = GNUNET_TIME_absolute_get_remaining (next_timestamp);
+ if (0 != offset.rel_value)
+ {
+ /* 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;
+ if (estimate_count < HISTORY_SIZE)
+ estimate_count++;
+ if ((current_timestamp.abs_value ==
+ GNUNET_TIME_absolute_ntoh (next_message.timestamp).abs_value) &&
+ (get_matching_bits (current_timestamp, &my_identity) >
+ ntohl(next_message.matching_bits)))
+ {
+ /* we received a message for this round way early, use it! */
+ size_estimate_messages[estimate_index] = next_message;
+ size_estimate_messages[estimate_index].hop_count =
+ htonl (1 + ntohl (next_message.hop_count));
+ }
+ else
+ setup_flood_message (estimate_index, current_timestamp);
+ next_message.matching_bits = htonl (0); /* reset for 'next' round */
+ 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);
+}
- GNUNET_assert(flood_task == GNUNET_SCHEDULER_NO_TASK);
- if (0 != GNUNET_TIME_absolute_get_remaining(next_timestamp).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);
- }
+/**
+ * Count the leading zeroes in hash.
+ *
+ * @param hash
+ * @return the number of leading zero bits.
+ */
+static unsigned int
+count_leading_zeroes (const GNUNET_HashCode * hash)
+{
+ unsigned int hash_count;
- /* 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 = (curr_time.abs_value / GNUNET_NSE_INTERVAL) * (GNUNET_NSE_INTERVAL + 1);
+ hash_count = 0;
+ while ((0 == GNUNET_CRYPTO_hash_get_bit (hash, hash_count)))
+ hash_count++;
+ return hash_count;
+}
- GNUNET_CRYPTO_hash(&next_timestamp.abs_value, sizeof(uint64_t), ×tamp_hash);
- matching_bits = GNUNET_CRYPTO_hash_matching_bits(×tamp_hash, &my_identity.hashPubKey);
- flood_message.timestamp = GNUNET_TIME_absolute_hton(next_timestamp);
- flood_message.distance = htons(matching_bits);
- flood_message.enc_type = htons(0);
- flood_message.proof_of_work = htonl(0);
- purpose.purpose = GNUNET_SIGNATURE_PURPOSE_NSE_SEND;
- purpose.size = sizeof(struct GNUNET_NSE_FloodMessage) - sizeof(struct GNUNET_MessageHeader) - sizeof(flood_message.proof_of_work) - sizeof(flood_message.signature);
- GNUNET_CRYPTO_rsa_sign(my_private_key, &purpose, &flood_message.signature);
+/**
+ * Check whether the given public key
+ * and integer are a valid proof of work.
+ *
+ * @param pkey the public key
+ * @param val the integer
+ *
+ * @return GNUNET_YES if valid, GNUNET_NO if not
+ */
+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_leading_zeroes (&result) >=
+ nse_work_required) ? GNUNET_YES : GNUNET_NO;
+}
- /*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));
+/**
+ * Write our current proof to disk.
+ */
+static void
+write_proof ()
+{
+ char *proof;
- fprintf(stderr, "my id matches %d bits, offset is %lu\n", matching_bits, (uint64_t)millisecond_offset);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
+ return;
+ if (sizeof (my_proof) !=
+ GNUNET_DISK_fn_write (proof, &my_proof, sizeof (my_proof),
+ GNUNET_DISK_PERM_USER_READ |
+ GNUNET_DISK_PERM_USER_WRITE))
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", proof);
+ GNUNET_free (proof);
- estimate_index += 1;
+}
- if (estimate_index >= DEFAULT_HISTORY_SIZE)
- estimate_index = 0;
- offset.rel_value = (uint64_t)millisecond_offset + GNUNET_TIME_absolute_get_remaining (next_timestamp).rel_value;
- flood_task = GNUNET_SCHEDULER_add_delayed (offset,
- &send_flood_message, NULL);
+/**
+ * Find our proof of work.
+ *
+ * @param cls closure (unused)
+ * @param tc task context
+ */
+static void
+find_proof (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+#define ROUND_SIZE 10
+ uint64_t counter;
+ char buf[sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
+ sizeof (uint64_t)];
+ GNUNET_HashCode result;
+ unsigned int i;
+ proof_task = GNUNET_SCHEDULER_NO_TASK;
+ memcpy (&buf[sizeof (uint64_t)], &my_public_key,
+ sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
+ i = 0;
+ counter = my_proof;
+ while ((counter != UINT64_MAX) && (i < ROUND_SIZE))
+ {
+ memcpy (buf, &counter, sizeof (uint64_t));
+ GNUNET_CRYPTO_hash (buf, sizeof (buf), &result);
+ if (nse_work_required <= count_leading_zeroes (&result))
+ {
+ my_proof = counter;
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Proof of work found: %llu!\n",
+ (unsigned long long) GNUNET_ntohll (counter));
+#endif
+ write_proof ();
+ setup_flood_message (estimate_index, current_timestamp);
+ return;
+ }
+ counter++;
+ i++;
+ }
+ if (my_proof / (100 * ROUND_SIZE) < counter / (100 * ROUND_SIZE))
+ {
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Testing proofs currently at %llu\n",
+ (unsigned long long) counter);
+#endif
+ /* remember progress every 100 rounds */
+ my_proof = counter;
+ write_proof ();
+ }
+ else
+ {
+ my_proof = counter;
+ }
+ proof_task =
+ GNUNET_SCHEDULER_add_delayed_with_priority (proof_find_delay,
+ GNUNET_SCHEDULER_PRIORITY_IDLE,
+ &find_proof, NULL);
}
+
/**
- * Core handler for size estimate flooding messages.
+ * An incoming flood message has been received which claims
+ * to have more bits matching than any we know in this time
+ * period. Verify the signature and/or proof of work.
*
- * @param cls closure unused
- * @param message message
- * @param peer peer identity this message is from (ignored)
- * @param atsi performance data (ignored)
+ * @param incoming_flood the message to verify
*
+ * @return GNUNET_YES if the message is verified
+ * GNUNET_NO if the key/signature don't verify
*/
static int
-handle_p2p_size_estimate(void *cls, const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+verify_message_crypto (const struct GNUNET_NSE_FloodMessage *incoming_flood)
{
- struct GNUNET_NSE_FloodMessage *incoming_flood;
-
- if (ntohs(message->size) != sizeof(struct GNUNET_NSE_FloodMessage))
+ if (GNUNET_YES !=
+ check_proof_of_work (&incoming_flood->pkey,
+ incoming_flood->proof_of_work))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Proof of work invalid: %llu!\n"),
+ (unsigned long long)
+ GNUNET_ntohll (incoming_flood->proof_of_work));
+ GNUNET_break_op (0);
return GNUNET_NO;
+ }
+ if ((nse_work_required > 0) &&
+ (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;
+}
- incoming_flood = (struct GNUNET_NSE_FloodMessage *)message;
- if (ntohs(incoming_flood->distance) <= ntohs(size_estimate_messages[estimate_index].distance)) /* Not closer than our most recent message */
- return GNUNET_OK;
-
- /* Have a new, better size estimate! */
- update_network_size_estimate(incoming_flood);
-
- 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);
+/**
+ * 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_NO)
+ {
+ /* 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_cb, peer_entry);
return GNUNET_OK;
}
+
/**
- * Send a flood message.
+ * Core handler for size estimate flooding messages.
*
- * If we've gotten here, it means we haven't received
- * a network size estimate message closer than ours.
+ * @param cls closure unused
+ * @param message message
+ * @param peer peer identity this message is from (ignored)
+ * @param atsi performance data (ignored)
+ * @param atsi_count number of records in 'atsi'
*/
-static void
-send_flood_message (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext * tc)
+static int
+handle_p2p_size_estimate (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_ATS_Information *atsi,
+ unsigned int atsi_count)
{
+ const struct GNUNET_NSE_FloodMessage *incoming_flood;
+ struct GNUNET_TIME_Absolute ts;
struct NSEPeerEntry *peer_entry;
+ uint32_t matching_bits;
+ unsigned int idx;
- flood_task = GNUNET_SCHEDULER_NO_TASK;
- if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- return;
+#if ENABLE_HISTOGRAM
+ if (NULL != wh)
+ GNUNET_BIO_write_int64 (wh, GNUNET_TIME_absolute_get ().abs_value);
+#endif
+ 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);
+#if DEBUG_NSE
+ {
+ char origin[5];
+ char pred[5];
+ struct GNUNET_PeerIdentity os;
+
+ GNUNET_CRYPTO_hash (&incoming_flood->pkey,
+ sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
+ &os.hashPubKey);
+ GNUNET_snprintf (origin, sizeof (origin), "%s", GNUNET_i2s (&os));
+ GNUNET_snprintf (pred, sizeof (pred), "%s", GNUNET_i2s (peer));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Flood at %llu from `%s' via `%s' at `%s' with bits %u\n",
+ (unsigned long long)
+ GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp).abs_value,
+ origin, pred, GNUNET_i2s (&my_identity),
+ (unsigned int) matching_bits);
+ }
+#endif
- peer_entry = peers_head;
+ peer_entry = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (NULL == peer_entry)
+ {
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+#if ENABLE_HISTOGRAM
+ peer_entry->received_messages++;
+ if (peer_entry->transmitted_messages > 0 &&
+ peer_entry->last_transmitted_size >= matching_bits)
+ GNUNET_STATISTICS_update(stats, "# cross messages", 1, GNUNET_NO);
+#endif
- while (peer_entry != NULL)
+ 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 (matching_bits <= ntohl (next_message.matching_bits))
+ return GNUNET_OK; /* ignore, simply too early/late */
+ if (GNUNET_YES != verify_message_crypto (incoming_flood))
{
- peer_entry->th
- = GNUNET_CORE_notify_transmit_ready (coreAPI,
- GNUNET_YES,
- DEFAULT_NSE_PRIORITY,
- GNUNET_TIME_absolute_get_remaining (
- next_timestamp),
- &peer_entry->id,
- ntohs (flood_message.header.size),
- &transmit_ready, peer_entry);
- peer_entry = peer_entry->next;
+ GNUNET_break_op (0);
+ return GNUNET_OK;
}
-
- update_network_size_estimate(&flood_message);
- 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);
+ next_message = *incoming_flood;
+ return GNUNET_OK;
+ }
+ else
+ {
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages discarded (clock skew too large)",
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ 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 in the other direction, as this peer clearly has
+ up-to-date information already. Even if we didn't talk to this peer in
+ the previous round, we should no longer send it stale information as it
+ told us about the current round! */
+ peer_entry->previous_round = GNUNET_YES;
+ if (idx != estimate_index)
+ {
+ /* do not transmit information for the previous round to this peer
+ anymore (but allow current round) */
+ return GNUNET_OK;
+ }
+ /* got up-to-date information for current round, cancel transmission to
+ * this peer altogether */
+ if (GNUNET_SCHEDULER_NO_TASK != peer_entry->transmit_task)
+ {
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (peer_entry->th != NULL)
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (peer_entry->th);
+ peer_entry->th = NULL;
+ }
+ return GNUNET_OK;
+ }
+ if (matching_bits < ntohl (size_estimate_messages[idx].matching_bits))
+ {
+ if ((idx < estimate_index) && (peer_entry->previous_round == GNUNET_YES))
+ peer_entry->previous_round = GNUNET_NO;
+ /* push back our result now, that peer is spreading bad information... */
+ if (NULL == peer_entry->th)
+ {
+ if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->transmit_task =
+ GNUNET_SCHEDULER_add_now (&transmit_task_cb, peer_entry);
+ }
+ /* Not closer than our most recent message, no need to do work here */
+ GNUNET_STATISTICS_update (stats,
+ "# flood messages ignored (had closer already)",
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ if (GNUNET_YES != verify_message_crypto (incoming_flood))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ GNUNET_assert (matching_bits >
+ ntohl (size_estimate_messages[idx].matching_bits));
+ /* cancel transmission from us to this peer for this round */
+ if (idx == estimate_index)
+ {
+ /* cancel any activity for current round */
+ if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+ peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ 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_YES;
+ }
+ 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);
+ GNUNET_STATISTICS_set (stats,
+ "# estimated network diameter",
+ hop_count_max, GNUNET_NO);
+
+ /* 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;
}
+
+
/**
* Method called whenever a peer connects.
*
* @param cls closure
* @param peer peer identity this notification is about
* @param atsi performance data
+ * @param atsi_count number of records in 'atsi'
*/
static void
-handle_core_connect (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_ATS_Information *atsi,
+ unsigned int atsi_count)
{
struct NSEPeerEntry *peer_entry;
- 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);
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%s' connected to us\n",
+ GNUNET_i2s (peer));
+#endif
+ peer_entry = GNUNET_malloc (sizeof (struct NSEPeerEntry));
+ peer_entry->id = *peer;
+ GNUNET_assert (GNUNET_OK ==
+ 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_cb,
+ peer_entry);
+ GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
}
{
struct NSEPeerEntry *pos;
- pos = peers_head;
- while ((NULL != pos) && (0 != memcmp(&pos->id, peer, sizeof(struct GNUNET_PeerIdentity))))
- pos = pos->next;
- if (pos == NULL)
- {
- 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... */
- return;
- }
-
- if (pos->pending_message != NULL)
- GNUNET_free(pos->pending_message);
-
+#if DEBUG_NSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%s' disconnected from us\n",
+ GNUNET_i2s (peer));
+#endif
+ pos = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
+ if (NULL == pos)
+ {
+ 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);
+ {
+ GNUNET_CORE_notify_transmit_ready_cancel (pos->th);
+ pos->th = NULL;
+ }
+ GNUNET_free (pos);
+ GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
}
-/**
- * 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;
+ }
+ if (proof_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (proof_task);
+ proof_task = GNUNET_SCHEDULER_NO_TASK;
+ write_proof (); /* remember progress */
+ }
+ if (nc != NULL)
+ {
+ GNUNET_SERVER_notification_context_destroy (nc);
+ nc = NULL;
+ }
if (coreAPI != NULL)
- {
- GNUNET_CORE_disconnect(coreAPI);
- coreAPI = NULL;
- }
-
+ {
+ GNUNET_CORE_disconnect (coreAPI);
+ coreAPI = NULL;
+ }
+ if (stats != NULL)
+ {
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ stats = NULL;
+ }
+ if (peers != NULL)
+ {
+ GNUNET_CONTAINER_multihashmap_destroy (peers);
+ peers = NULL;
+ }
+ if (my_private_key != NULL)
+ {
+ GNUNET_CRYPTO_rsa_key_free (my_private_key);
+ my_private_key = NULL;
+ }
+#if ENABLE_HISTOGRAM
+ if (wh != NULL)
+ {
+ GNUNET_BIO_write_close (wh);
+ wh = NULL;
+ }
+#endif
}
* @param cls service closure
* @param server handle to the server for this service
* @param identity the public identity of this peer
- * @param publicKey the public key of this peer
*/
-void
-core_init (void *cls,
- struct GNUNET_CORE_Handle *server,
- const struct GNUNET_PeerIdentity *identity,
- const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
+static void
+core_init (void *cls, struct GNUNET_CORE_Handle *server,
+ const struct GNUNET_PeerIdentity *identity)
{
- if (server == NULL)
- {
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "%s: Connection to core FAILED!\n", "nse",
- GNUNET_i2s (identity));
-#endif
- GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
- return;
- }
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "%s: Core connection initialized, I am peer: %s\n", "nse",
- GNUNET_i2s (identity));
-#endif
-
- /* 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));
-
- flood_message.header.size = htons(sizeof(struct GNUNET_NSE_FloodMessage));
- flood_message.header.type = htons(GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD);
- memcpy(&flood_message.pkey, &my_public_key, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
-
- if (flood_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel(flood_task);
+ struct GNUNET_TIME_Absolute now;
+ struct GNUNET_TIME_Absolute prev_time;
- schedule_flood_task = GNUNET_SCHEDULER_add_now(&schedule_flood_message, NULL);
-
- GNUNET_SERVER_notification_context_broadcast (nc,
- ¤t_estimate_message.header,
- GNUNET_NO);
+ if (server == NULL)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection to core FAILED!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ GNUNET_assert (0 ==
+ memcmp (&my_identity, identity,
+ sizeof (struct GNUNET_PeerIdentity)));
+ now = GNUNET_TIME_absolute_get ();
+ current_timestamp.abs_value =
+ (now.abs_value / gnunet_nse_interval.rel_value) *
+ gnunet_nse_interval.rel_value;
+ next_timestamp =
+ GNUNET_TIME_absolute_add (current_timestamp, gnunet_nse_interval);
+ estimate_index = HISTORY_SIZE - 1;
+ estimate_count = 0;
+ if (GNUNET_YES == check_proof_of_work (&my_public_key, my_proof))
+ {
+ prev_time.abs_value =
+ current_timestamp.abs_value - gnunet_nse_interval.rel_value;
+ setup_flood_message (estimate_index, prev_time);
+ estimate_count++;
+ }
+ flood_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
+ (next_timestamp), &update_flood_message,
+ NULL);
}
+
/**
* Handle network size estimate clients.
*
* @param c configuration to use
*/
static void
-run (void *cls,
- struct GNUNET_SERVER_Handle *server,
+run (void *cls, struct GNUNET_SERVER_Handle *server,
const struct GNUNET_CONFIGURATION_Handle *c)
{
char *keyfile;
+ char *proof;
+
static const struct GNUNET_SERVER_MessageHandler handlers[] = {
- {&handle_start_message, NULL, GNUNET_MESSAGE_TYPE_NSE_START, 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},
+ {&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))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("NSE service is lacking key configuration settings. Exiting.\n"));
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
+ if ((GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (cfg, "NSE", "INTERVAL",
+ &gnunet_nse_interval)) ||
+ (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (cfg, "NSE", "WORKDELAY",
+ &proof_find_delay)) ||
+ (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg, "NSE", "WORKBITS",
+ &nse_work_required)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("NSE service is lacking key configuration settings. Exiting.\n"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ if (nse_work_required >= sizeof (GNUNET_HashCode) * 8)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Invalid work requirement for NSE service. Exiting.\n"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ 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_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"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
+ GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
+ &my_identity.hashPubKey);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("NSE service is lacking key configuration settings. Exiting.\n"));
+ if (my_private_key != NULL)
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("NSE Service could not access hostkey. Exiting.\n"));
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_CRYPTO_rsa_key_free (my_private_key);
+ my_private_key = NULL;
}
-
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ if ((GNUNET_YES != GNUNET_DISK_file_test (proof)) ||
+ (sizeof (my_proof) !=
+ GNUNET_DISK_fn_read (proof, &my_proof, sizeof (my_proof))))
+ my_proof = 0;
+ GNUNET_free (proof);
+ proof_task =
+ GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_IDLE,
+ &find_proof, NULL);
+
+ peers = GNUNET_CONTAINER_multihashmap_create (128);
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 */
+ 1, 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;
- }
-
- 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,
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
NULL);
+#if ENABLE_HISTOGRAM
+ if (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "HISTOGRAM", &proof))
+ {
+ wh = GNUNET_BIO_write_open (proof);
+ GNUNET_free (proof);
+ }
+#endif
+ if (coreAPI == NULL)
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ stats = GNUNET_STATISTICS_create ("nse", cfg);
}
main (int argc, char *const *argv)
{
return (GNUNET_OK ==
- GNUNET_SERVICE_run (argc,
- argv,
- "nse",
- GNUNET_SERVICE_OPTION_NONE,
+ GNUNET_SERVICE_run (argc, argv, "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 / blobdiff