uncrustify as demanded.
[oweals/gnunet.git] / src / nse / gnunet-service-nse.c
index 3047860b82fa524fa600a7060311bf9996e166bb..d71c625416a00e309ab0609b9d8b40a1303cecc8 100644 (file)
@@ -1,21 +1,21 @@
 /*
-  This file is part of GNUnet.
-  (C) 2009, 2010, 2011, 2012, 2013 Christian Grothoff (and other contributing authors)
-
-  GNUnet is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3, or (at your
-  option) any later version.
-
-  GNUnet is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with GNUnet; see the file COPYING.  If not, write to the
-  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-  Boston, MA 02111-1307, USA.
+   This file is part of GNUnet.
+   Copyright (C) 2009, 2010, 2011, 2012, 2013, 2016 GNUnet e.V.
+
+   GNUnet is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   GNUnet is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
  */
 
 /**
 #include "gnunet_statistics_service.h"
 #include "gnunet_core_service.h"
 #include "gnunet_nse_service.h"
+#if ENABLE_NSE_HISTOGRAM
+#include "gnunet_testbed_logger_service.h"
+#endif
 #include "nse.h"
 #include <gcrypt.h>
 
 
 /**
  * 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.
+ * #GNUNET_NO only for experiments, not in production.
  */
 #define USE_RANDOM_DELAYS GNUNET_YES
 
 /**
- * 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.
+ * Generate extensive debug-level log messages?
  */
-#define ENABLE_HISTOGRAM GNUNET_NO
+#define DEBUG_NSE GNUNET_NO
 
 /**
  * Over how many values do we calculate the weighted average?
 #define HISTORY_SIZE 64
 
 /**
- * Message priority to use.
+ * Message priority to use.  No real rush, reliability not
+ * required. Corking OK.
  */
-#define NSE_PRIORITY 5
+#define NSE_PRIORITY                                       \
+  (GNUNET_MQ_PRIO_BACKGROUND | GNUNET_MQ_PREF_UNRELIABLE | \
+   GNUNET_MQ_PREF_CORK_ALLOWED)
 
 #if FREEBSD
-#define log2(a) (log(a)/log(2))
+#define log2(a) (log(a) / log(2))
 #endif
 
 /**
@@ -92,44 +94,53 @@ static struct GNUNET_TIME_Relative gnunet_nse_interval;
  */
 static struct GNUNET_TIME_Relative proof_find_delay;
 
-#if ENABLE_HISTOGRAM
+#if ENABLE_NSE_HISTOGRAM
+
+/**
+ * Handle to test if testbed logger service is running or not
+ */
+struct GNUNET_CLIENT_TestHandle *logger_test;
+
 /**
  * Handle for writing when we received messages to disk.
  */
-static struct GNUNET_BIO_WriteHandle *wh;
+static struct GNUNET_TESTBED_LOGGER_Handle *lh;
+
+/**
+ * Handle for writing message received timestamp information to disk.
+ */
+static struct GNUNET_BIO_WriteHandle *histogram;
+
 #endif
 
 
 /**
  * Per-peer information.
  */
-struct NSEPeerEntry
-{
-
+struct NSEPeerEntry {
   /**
    * Core handle for sending messages to this peer.
    */
-  struct GNUNET_CORE_TransmitHandle *th;
+  struct GNUNET_MQ_Handle *mq;
 
   /**
    * What is the identity of the peer?
    */
-  struct GNUNET_PeerIdentity id;
+  const struct GNUNET_PeerIdentity *id;
 
   /**
    * Task scheduled to send message to this peer.
    */
-  GNUNET_SCHEDULER_TaskIdentifier transmit_task;
+  struct GNUNET_SCHEDULER_Task *transmit_task;
 
   /**
    * Did we receive or send a message about the previous round
-   * to this peer yet?   GNUNET_YES if the previous round has
+   * to this peer yet?   #GNUNET_YES if the previous round has
    * been taken care of.
    */
   int previous_round;
 
-#if ENABLE_HISTOGRAM
-
+#if ENABLE_NSE_HISTOGRAM
   /**
    * Amount of messages received from this peer on this round.
    */
@@ -144,9 +155,7 @@ struct NSEPeerEntry
    * Which size did we tell the peer the network is?
    */
   unsigned int last_transmitted_size;
-
 #endif
-
 };
 
 
@@ -157,10 +166,9 @@ GNUNET_NETWORK_STRUCT_BEGIN
  * peer's timer has run out before receiving a
  * valid reply from another peer.
  */
-struct GNUNET_NSE_FloodMessage
-{
+struct GNUNET_NSE_FloodMessage {
   /**
-   * Type: GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD
+   * Type: #GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD
    */
   struct GNUNET_MessageHeader header;
 
@@ -190,7 +198,7 @@ struct GNUNET_NSE_FloodMessage
   /**
    * Public key of the originator.
    */
-  struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded pkey;
+  struct GNUNET_PeerIdentity origin;
 
   /**
    * Proof of work, causing leading zeros when hashed with pkey.
@@ -200,7 +208,7 @@ struct GNUNET_NSE_FloodMessage
   /**
    * Signature (over range specified in purpose).
    */
-  struct GNUNET_CRYPTO_EccSignature signature;
+  struct GNUNET_CRYPTO_EddsaSignature signature;
 };
 GNUNET_NETWORK_STRUCT_END
 
@@ -217,12 +225,12 @@ static struct GNUNET_STATISTICS_Handle *stats;
 /**
  * Handle to the core service.
  */
-static struct GNUNET_CORE_Handle *coreAPI;
+static struct GNUNET_CORE_Handle *core_api;
 
 /**
  * Map of all connected peers.
  */
-static struct GNUNET_CONTAINER_MultiHashMap *peers;
+static struct GNUNET_CONTAINER_MultiPeerMap *peers;
 
 /**
  * The current network size estimate.  Number of bits matching on
@@ -231,7 +239,7 @@ static struct GNUNET_CONTAINER_MultiHashMap *peers;
 static double current_size_estimate;
 
 /**
- * The standard deviation of the last HISTORY_SIZE network
+ * The standard deviation of the last #HISTORY_SIZE network
  * size estimates.
  */
 static double current_std_dev = NAN;
@@ -264,17 +272,17 @@ static unsigned int estimate_count;
 /**
  * Task scheduled to update our flood message for the next round.
  */
-static GNUNET_SCHEDULER_TaskIdentifier flood_task;
+static struct GNUNET_SCHEDULER_Task *flood_task;
 
 /**
  * Task scheduled to compute our proof.
  */
-static GNUNET_SCHEDULER_TaskIdentifier proof_task;
+static struct GNUNET_SCHEDULER_Task *proof_task;
 
 /**
  * Notification context, simplifies client broadcasts.
  */
-static struct GNUNET_SERVER_NotificationContext *nc;
+static struct GNUNET_NotificationContext *nc;
 
 /**
  * The next major time.
@@ -286,15 +294,10 @@ static struct GNUNET_TIME_Absolute next_timestamp;
  */
 static struct GNUNET_TIME_Absolute current_timestamp;
 
-/**
- * The public key of this peer.
- */
-static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
-
 /**
  * The private key of this peer.
  */
-static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
+static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
 
 /**
  * The peer identity of this peer.
@@ -306,16 +309,6 @@ static struct GNUNET_PeerIdentity my_identity;
  */
 static uint64_t my_proof;
 
-/**
- * Handle to this serivce's server.
- */
-static struct GNUNET_SERVER_Handle *srv;
-
-/**
- * Hostkey generation context
- */
-static struct GNUNET_CRYPTO_EccKeyGenerationContext *keygen;
-
 
 /**
  * Initialize a message to clients with the current network
@@ -324,10 +317,8 @@ static struct GNUNET_CRYPTO_EccKeyGenerationContext *keygen;
  * @param em message to fill in
  */
 static void
-setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
+setup_estimate_message(struct GNUNET_NSE_ClientMessage *em)
 {
-  unsigned int i;
-  unsigned int j;
   double mean;
   double sum;
   double std_dev;
@@ -348,19 +339,20 @@ setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
   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;
-  }
+  for (unsigned int i = 0; i < estimate_count; i++)
+    {
+      unsigned int 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
@@ -373,36 +365,46 @@ setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
   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;
-  }
+  for (unsigned int i = 0; i < estimate_count; i++)
+    {
+      unsigned int 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...
-  }
+    {
+      mean = sum / estimate_count;
+      variance = (vsq - mean * sum) /
+                 (estimate_count - 1.0); // terrible for numerical stability...
+    }
 #endif
   if (variance >= 0)
-    std_dev = sqrt (variance);
+    std_dev = sqrt(variance);
   else
-    std_dev = variance;         /* must be infinity due to estimate_count == 0 */
+    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);
+  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;
+    unsigned int j = GNUNET_CONTAINER_multipeermap_size(peers);
+    if (0 == j)
+      j = 1; /* Avoid log2(0); can only happen if CORE didn't report
+                connection to self yet */
+    nsize = log2(j);
+    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, GNUNET_MAX(se, nsize)),
+                          GNUNET_NO);
+  }
 }
 
 
@@ -412,22 +414,25 @@ setup_estimate_message (struct GNUNET_NSE_ClientMessage *em)
  * Also, we remember the client for updates upon future
  * estimate measurements.
  *
- * @param cls unused
- * @param client who sent the message
+ * @param cls client who sent the message
  * @param message the message received
  */
 static void
-handle_start_message (void *cls, struct GNUNET_SERVER_Client *client,
-                      const struct GNUNET_MessageHeader *message)
+handle_start(void *cls, const struct GNUNET_MessageHeader *message)
 {
+  struct GNUNET_SERVICE_Client *client = cls;
+  struct GNUNET_MQ_Handle *mq;
   struct GNUNET_NSE_ClientMessage em;
-
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received START message from client\n");
-  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);
+  struct GNUNET_MQ_Envelope *env;
+
+  (void)message;
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received START message from client\n");
+  mq = GNUNET_SERVICE_client_get_mq(client);
+  GNUNET_notification_context_add(nc, mq);
+  setup_estimate_message(&em);
+  env = GNUNET_MQ_msg_copy(&em.header);
+  GNUNET_MQ_send(mq, env);
+  GNUNET_SERVICE_client_continue(client);
 }
 
 
@@ -438,16 +443,16 @@ handle_start_message (void *cls, struct GNUNET_SERVER_Client *client,
  * @param matching_bits number of matching bits to consider
  */
 static double
-get_matching_bits_delay (uint32_t matching_bits)
+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));
+  return ((double)gnunet_nse_interval.rel_value_us / (double)2.0) -
+         ((gnunet_nse_interval.rel_value_us / M_PI) *
+          atan(matching_bits - current_size_estimate));
 }
 
 
@@ -458,19 +463,21 @@ get_matching_bits_delay (uint32_t matching_bits)
  * @return random delay to apply
  */
 static struct GNUNET_TIME_Relative
-get_delay_randomization (uint32_t matching_bits)
+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));
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-             "Randomizing flood using latencies up to %u ms\n",
-             (unsigned int) i);
-  ret.rel_value = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, i + 1);
+  d = get_matching_bits_delay(matching_bits);
+  i = (uint32_t)(d / (double)(hop_count_max + 1));
+  ret.rel_value_us = i;
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+             "Randomizing flood using latencies up to %s\n",
+             GNUNET_STRINGS_relative_time_to_string(ret, GNUNET_YES));
+  ret.rel_value_us =
+    GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, i + 1);
   return ret;
 #else
   return GNUNET_TIME_UNIT_ZERO;
@@ -482,21 +489,22 @@ get_delay_randomization (uint32_t matching_bits)
  * Calculate the 'proof-of-work' hash (an expensive hash).
  *
  * @param buf data to hash
- * @param buf_len number of bytes in 'buf'
+ * @param buf_len number of bytes in @a buf
  * @param result where to write the resulting hash
  */
 static void
-pow_hash (const void *buf,
-         size_t buf_len,
-         struct GNUNET_HashCode *result)
+pow_hash(const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
 {
-  GNUNET_break (0 == 
-               gcry_kdf_derive (buf, buf_len,
-                                GCRY_KDF_PBKDF2 /* FIX: use SCRYPT! */,
-                                1 /* subalgo */,
-                                "gnunet-proof-of-work", strlen ("gnunet-proof-of-work"),
-                                2 /* iterations; keep cost of individual op small */,
-                                sizeof (struct GNUNET_HashCode), result));
+  GNUNET_break(
+    0 == gcry_kdf_derive(buf,
+                         buf_len,
+                         GCRY_KDF_SCRYPT,
+                         1 /* subalgo */,
+                         "gnunet-proof-of-work",
+                         strlen("gnunet-proof-of-work"),
+                         2 /* iterations; keep cost of individual op small */,
+                         sizeof(struct GNUNET_HashCode),
+                         result));
 }
 
 
@@ -508,14 +516,17 @@ pow_hash (const void *buf,
  * @return number of matching bits
  */
 static uint32_t
-get_matching_bits (struct GNUNET_TIME_Absolute timestamp,
-                   const struct GNUNET_PeerIdentity *id)
+get_matching_bits(struct GNUNET_TIME_Absolute timestamp,
+                  const struct GNUNET_PeerIdentity *id)
 {
   struct GNUNET_HashCode timestamp_hash;
+  struct GNUNET_HashCode pid_hash;
 
-  GNUNET_CRYPTO_hash (&timestamp.abs_value, sizeof (timestamp.abs_value),
-                      &timestamp_hash);
-  return GNUNET_CRYPTO_hash_matching_bits (&timestamp_hash, &id->hashPubKey);
+  GNUNET_CRYPTO_hash(&timestamp.abs_value_us,
+                     sizeof(timestamp.abs_value_us),
+                     &timestamp_hash);
+  GNUNET_CRYPTO_hash(id, sizeof(struct GNUNET_PeerIdentity), &pid_hash);
+  return GNUNET_CRYPTO_hash_matching_bits(&timestamp_hash, &pid_hash);
 }
 
 
@@ -528,7 +539,7 @@ get_matching_bits (struct GNUNET_TIME_Absolute timestamp,
  * @return delay that should be applied
  */
 static struct GNUNET_TIME_Relative
-get_transmit_delay (int round_offset)
+get_transmit_delay(int round_offset)
 {
   struct GNUNET_TIME_Relative ret;
   struct GNUNET_TIME_Absolute tgt;
@@ -536,35 +547,37 @@ get_transmit_delay (int round_offset)
   uint32_t matching_bits;
 
   switch (round_offset)
-  {
-  case -1:
-    /* previous round is randomized between 0 and 50 ms */
+    {
+    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);
+      ret.rel_value_us =
+        GNUNET_CRYPTO_random_u64(GNUNET_CRYPTO_QUALITY_WEAK, 50);
 #else
-    ret = GNUNET_TIME_UNIT_ZERO;
+      ret = GNUNET_TIME_UNIT_ZERO;
 #endif
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Transmitting previous round behind schedule in %llu ms\n",
-                (unsigned long long) ret.rel_value);
-    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;
-    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);
-    /* 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);
+      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+                 "Transmitting previous round behind schedule in %s\n",
+                 GNUNET_STRINGS_relative_time_to_string(ret, GNUNET_YES));
+      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_us;
+      ret.rel_value_us = (uint64_t)dist_delay;
+      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+                 "For round %s, delay for %u matching bits is %s\n",
+                 GNUNET_STRINGS_absolute_time_to_string(current_timestamp),
+                 (unsigned int)matching_bits,
+                 GNUNET_STRINGS_relative_time_to_string(ret, GNUNET_YES));
+      /* 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;
 }
 
@@ -572,102 +585,63 @@ get_transmit_delay (int round_offset)
 /**
  * Task that triggers a NSE P2P transmission.
  *
- * @param cls the 'struct NSEPeerEntry'
- * @param tc scheduler context
+ * @param cls the `struct NSEPeerEntry *`
  */
 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.
- *
- * @param cls closure (NULL)
- * @param size number of bytes available in buf
- * @param buf where the callee should write the message
- * @return number of bytes written to buf
- */
-static size_t
-transmit_ready (void *cls, size_t size, void *buf)
+transmit_task_cb(void *cls)
 {
   struct NSEPeerEntry *peer_entry = cls;
   unsigned int idx;
+  struct GNUNET_MQ_Envelope *env;
 
-  peer_entry->th = NULL;
-  if (NULL == buf)
-  {
-    /* client disconnected */
-    return 0;
-  }
-  GNUNET_assert (size >= sizeof (struct GNUNET_NSE_FloodMessage));
+  peer_entry->transmit_task = NULL;
   idx = estimate_index;
   if (GNUNET_NO == peer_entry->previous_round)
-  {
-    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 ((0 == ntohl (size_estimate_messages[idx].hop_count)) &&
-      (GNUNET_SCHEDULER_NO_TASK != proof_task))
-  {
-    GNUNET_STATISTICS_update (stats,
-                              "# flood messages not generated (no proof yet)",
-                              1, GNUNET_NO);
-    return 0;
-  }
-  if (0 == ntohs (size_estimate_messages[idx].header.size))
-  {
-    GNUNET_STATISTICS_update (stats,
-                              "# flood messages not generated (lack of history)",
-                              1, GNUNET_NO);
-    return 0;
-  }
-  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));
-  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
+    {
+      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 ((0 == ntohl(size_estimate_messages[idx].hop_count)) &&
+      (NULL != proof_task))
+    {
+      GNUNET_STATISTICS_update(stats,
+                               "# flood messages not generated (no proof yet)",
+                               1,
+                               GNUNET_NO);
+      return;
+    }
+  if (0 == ntohs(size_estimate_messages[idx].header.size))
+    {
+      GNUNET_STATISTICS_update(stats,
+                               "# flood messages not generated (lack of history)",
+                               1,
+                               GNUNET_NO);
+      return;
+    }
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+             "In round %s, sending to `%s' estimate with %u bits\n",
+             GNUNET_STRINGS_absolute_time_to_string(
+               GNUNET_TIME_absolute_ntoh(
+                 size_estimate_messages[idx].timestamp)),
+             GNUNET_i2s(peer_entry->id),
+             (unsigned int)ntohl(size_estimate_messages[idx].matching_bits));
+  if (0 == ntohl(size_estimate_messages[idx].hop_count))
+    GNUNET_STATISTICS_update(stats, "# flood messages started", 1, GNUNET_NO);
+  GNUNET_STATISTICS_update(stats,
+                           "# flood messages transmitted",
+                           1,
+                           GNUNET_NO);
+#if ENABLE_NSE_HISTOGRAM
   peer_entry->transmitted_messages++;
-  peer_entry->last_transmitted_size = 
-      ntohl(size_estimate_messages[idx].matching_bits);
+  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);
-}
-
-
-/**
- * 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);
+  env = GNUNET_MQ_msg_copy(&size_estimate_messages[idx].header);
+  GNUNET_MQ_send(peer_entry->mq, env);
 }
 
 
@@ -678,12 +652,12 @@ transmit_task_cb (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  * clients.
  */
 static void
-update_network_size_estimate ()
+update_network_size_estimate()
 {
   struct GNUNET_NSE_ClientMessage em;
 
-  setup_estimate_message (&em);
-  GNUNET_SERVER_notification_context_broadcast (nc, &em.header, GNUNET_YES);
+  setup_estimate_message(&em);
+  GNUNET_notification_context_broadcast(nc, &em.header, GNUNET_YES);
 }
 
 
@@ -695,32 +669,31 @@ update_network_size_estimate ()
  * @param ts timestamp to use
  */
 static void
-setup_flood_message (unsigned int slot,
-                    struct GNUNET_TIME_Absolute ts)
+setup_flood_message(unsigned int slot, struct GNUNET_TIME_Absolute ts)
 {
   struct GNUNET_NSE_FloodMessage *fm;
   uint32_t matching_bits;
 
-  matching_bits = get_matching_bits (ts, &my_identity);
+  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->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_EccSignature));
-  fm->matching_bits = htonl (matching_bits);
-  fm->timestamp = GNUNET_TIME_absolute_hton (ts);
-  fm->pkey = my_public_key;
+    htonl(sizeof(struct GNUNET_NSE_FloodMessage) -
+          sizeof(struct GNUNET_MessageHeader) - sizeof(uint32_t) -
+          sizeof(struct GNUNET_CRYPTO_EddsaSignature));
+  fm->matching_bits = htonl(matching_bits);
+  fm->timestamp = GNUNET_TIME_absolute_hton(ts);
+  fm->origin = my_identity;
   fm->proof_of_work = my_proof;
   if (nse_work_required > 0)
-    GNUNET_assert (GNUNET_OK ==
-                   GNUNET_CRYPTO_ecc_sign (my_private_key, &fm->purpose,
-                                           &fm->signature));
+    GNUNET_assert(GNUNET_OK == GNUNET_CRYPTO_eddsa_sign(my_private_key,
+                                                        &fm->purpose,
+                                                        &fm->signature));
   else
-    memset (&fm->signature, 0, sizeof (fm->signature));
+    memset(&fm->signature, 0, sizeof(fm->signature));
 }
 
 
@@ -730,39 +703,38 @@ setup_flood_message (unsigned int slot,
  *
  * @param cls unused
  * @param key hash of peer identity
- * @param value the 'struct NSEPeerEntry'
- * @return GNUNET_OK (continue to iterate)
+ * @param value the `struct NSEPeerEntry`
+ * @return #GNUNET_OK (continue to iterate)
  */
 static int
-schedule_current_round (void *cls, 
-                       const struct GNUNET_HashCode * key, 
-                       void *value)
+schedule_current_round(void *cls,
+                       const struct GNUNET_PeerIdentity *key,
+                       void *value)
 {
   struct NSEPeerEntry *peer_entry = value;
   struct GNUNET_TIME_Relative delay;
 
-  if (NULL != peer_entry->th)
-  {
-    peer_entry->previous_round = GNUNET_NO;
-    return GNUNET_OK;
-  }
-  if (GNUNET_SCHEDULER_NO_TASK != peer_entry->transmit_task)
-  {
-    GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
-    peer_entry->previous_round = GNUNET_NO;
-  }
-#if ENABLE_HISTOGRAM
+  (void)cls;
+  (void)key;
+  if (NULL != peer_entry->transmit_task)
+    {
+      GNUNET_SCHEDULER_cancel(peer_entry->transmit_task);
+      peer_entry->previous_round = GNUNET_NO;
+    }
+#if ENABLE_NSE_HISTOGRAM
   if (peer_entry->received_messages > 1)
-    GNUNET_STATISTICS_update(stats, "# extra messages",
-                             peer_entry->received_messages - 1, GNUNET_NO);
+    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);
+    get_transmit_delay((GNUNET_NO == peer_entry->previous_round) ? -1 : 0);
   peer_entry->transmit_task =
-      GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, peer_entry);
+    GNUNET_SCHEDULER_add_delayed(delay, &transmit_task_cb, peer_entry);
   return GNUNET_OK;
 }
 
@@ -771,97 +743,92 @@ schedule_current_round (void *cls,
  * Update our flood message to be sent (and our timestamps).
  *
  * @param cls unused
- * @param tc context for this message
  */
 static void
-update_flood_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+update_flood_message(void *cls)
 {
   struct GNUNET_TIME_Relative offset;
-  unsigned int i;
 
-  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;
-  }
+  (void)cls;
+  flood_task = NULL;
+  offset = GNUNET_TIME_absolute_get_remaining(next_timestamp);
+  if (0 != offset.rel_value_us)
+    {
+      /* somehow run early, delay more */
+      flood_task =
+        GNUNET_SCHEDULER_add_delayed(offset, &update_flood_message, NULL);
+      return;
+    }
   estimate_index = (estimate_index + 1) % HISTORY_SIZE;
   if (estimate_count < HISTORY_SIZE)
     estimate_count++;
   current_timestamp = next_timestamp;
   next_timestamp =
-      GNUNET_TIME_absolute_add (current_timestamp, gnunet_nse_interval);
-  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));
-  }
+    GNUNET_TIME_absolute_add(current_timestamp, gnunet_nse_interval);
+  if ((current_timestamp.abs_value_us ==
+       GNUNET_TIME_absolute_ntoh(next_message.timestamp).abs_value_us) &&
+      (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 */
+    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++)
+  for (unsigned int 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);
+      GNUNET_MAX(ntohl(size_estimate_messages[i].hop_count), hop_count_max);
+  GNUNET_CONTAINER_multipeermap_iterate(peers, &schedule_current_round, NULL);
   flood_task =
-      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
-                                    (next_timestamp), &update_flood_message,
-                                    NULL);
+    GNUNET_SCHEDULER_add_at(next_timestamp, &update_flood_message, NULL);
 }
 
 
 /**
  * Count the leading zeroes in hash.
  *
- * @param hash
+ * @param hash to count leading zeros in
  * @return the number of leading zero bits.
  */
 static unsigned int
-count_leading_zeroes (const struct GNUNET_HashCode * hash)
+count_leading_zeroes(const struct GNUNET_HashCode *hash)
 {
   unsigned int hash_count;
 
   hash_count = 0;
-  while ((0 == GNUNET_CRYPTO_hash_get_bit (hash, hash_count)))
+  while (0 == GNUNET_CRYPTO_hash_get_bit(hash, hash_count))
     hash_count++;
   return hash_count;
 }
 
 
 /**
- * Check whether the given public key
- * and integer are a valid proof of work.
+ * 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
+ * @return #GNUNET_YES if valid, #GNUNET_NO if not
  */
 static int
-check_proof_of_work (const struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded *pkey,
-                     uint64_t val)
+check_proof_of_work(const struct GNUNET_CRYPTO_EddsaPublicKey *pkey,
+                    uint64_t val)
 {
-  char buf[sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded) +
-           sizeof (val)] GNUNET_ALIGN;
+  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey) +
+           sizeof(val)] GNUNET_ALIGN;
   struct GNUNET_HashCode result;
 
-  memcpy (buf, &val, sizeof (val));
-  memcpy (&buf[sizeof (val)], pkey,
-          sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded));
-  pow_hash (buf, sizeof (buf), &result);
-  return (count_leading_zeroes (&result) >=
-          nse_work_required) ? GNUNET_YES : GNUNET_NO;
+  GNUNET_memcpy(buf, &val, sizeof(val));
+  GNUNET_memcpy(&buf[sizeof(val)],
+                pkey,
+                sizeof(struct GNUNET_CRYPTO_EddsaPublicKey));
+  pow_hash(buf, sizeof(buf), &result);
+  return (count_leading_zeroes(&result) >= nse_work_required) ? GNUNET_YES
+         : GNUNET_NO;
 }
 
 
@@ -869,20 +836,20 @@ check_proof_of_work (const struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded *pkey,
  * Write our current proof to disk.
  */
 static void
-write_proof ()
+write_proof()
 {
   char *proof;
 
   if (GNUNET_OK !=
-      GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
+      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);
-
+  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);
 }
 
 
@@ -890,55 +857,59 @@ write_proof ()
  * 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)
+find_proof(void *cls)
 {
 #define ROUND_SIZE 10
   uint64_t counter;
-  char buf[sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded) +
-           sizeof (uint64_t)] GNUNET_ALIGN;
+  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey) +
+           sizeof(uint64_t)] GNUNET_ALIGN;
   struct GNUNET_HashCode result;
   unsigned int i;
 
-  proof_task = GNUNET_SCHEDULER_NO_TASK;
-  memcpy (&buf[sizeof (uint64_t)], &my_public_key,
-          sizeof (struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded));
+  (void)cls;
+  proof_task = NULL;
+  GNUNET_memcpy(&buf[sizeof(uint64_t)],
+                &my_identity,
+                sizeof(struct GNUNET_PeerIdentity));
   i = 0;
   counter = my_proof;
   while ((counter != UINT64_MAX) && (i < ROUND_SIZE))
-  {
-    memcpy (buf, &counter, sizeof (uint64_t));
-    pow_hash (buf, sizeof (buf), &result);
-    if (nse_work_required <= count_leading_zeroes (&result))
     {
-      my_proof = counter;
-      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Proof of work found: %llu!\n",
-                  (unsigned long long) GNUNET_ntohll (counter));
-      write_proof ();
-      setup_flood_message (estimate_index, current_timestamp);
-      return;
+      GNUNET_memcpy(buf, &counter, sizeof(uint64_t));
+      pow_hash(buf, sizeof(buf), &result);
+      if (nse_work_required <= count_leading_zeroes(&result))
+        {
+          my_proof = counter;
+          GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+                     "Proof of work found: %llu!\n",
+                     (unsigned long long)GNUNET_ntohll(counter));
+          write_proof();
+          setup_flood_message(estimate_index, current_timestamp);
+          return;
+        }
+      counter++;
+      i++;
     }
-    counter++;
-    i++;
-  }
   if (my_proof / (100 * ROUND_SIZE) < counter / (100 * ROUND_SIZE))
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Testing proofs currently at %llu\n",
-                (unsigned long long) counter);
-    /* remember progress every 100 rounds */
-    my_proof = counter;
-    write_proof ();
-  }
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+                 "Testing proofs currently at %llu\n",
+                 (unsigned long long)counter);
+      /* remember progress every 100 rounds */
+      my_proof = counter;
+      write_proof();
+    }
   else
-  {
-    my_proof = counter;
-  }
+    {
+      my_proof = counter;
+    }
   proof_task =
-      GNUNET_SCHEDULER_add_delayed_with_priority (proof_find_delay,
-                                                 GNUNET_SCHEDULER_PRIORITY_IDLE,
-                                                 &find_proof, NULL);
+    GNUNET_SCHEDULER_add_delayed_with_priority(proof_find_delay,
+                                               GNUNET_SCHEDULER_PRIORITY_IDLE,
+                                               &find_proof,
+                                               NULL);
 }
 
 
@@ -948,33 +919,32 @@ find_proof (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  * period.  Verify the signature and/or proof of work.
  *
  * @param incoming_flood the message to verify
- *
- * @return GNUNET_YES if the message is verified
- *         GNUNET_NO if the key/signature don't verify
+ * @return #GNUNET_YES if the message is verified
+ *         #GNUNET_NO if the key/signature don't verify
  */
 static int
-verify_message_crypto (const struct GNUNET_NSE_FloodMessage *incoming_flood)
+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_log (GNUNET_ERROR_TYPE_DEBUG, "Proof of work invalid: %llu!\n",
-                (unsigned long long)
-                GNUNET_ntohll (incoming_flood->proof_of_work));
-    GNUNET_break_op (0);
-    return GNUNET_NO;
-  }
+  if (GNUNET_YES != check_proof_of_work(&incoming_flood->origin.public_key,
+                                        incoming_flood->proof_of_work))
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+                 "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_ecc_verify (GNUNET_SIGNATURE_PURPOSE_NSE_SEND,
-                                 &incoming_flood->purpose,
-                                 &incoming_flood->signature,
-                                 &incoming_flood->pkey)))
-  {
-    GNUNET_break_op (0);
-    return GNUNET_NO;
-  }
+       GNUNET_CRYPTO_eddsa_verify(GNUNET_SIGNATURE_PURPOSE_NSE_SEND,
+                                  &incoming_flood->purpose,
+                                  &incoming_flood->signature,
+                                  &incoming_flood->origin.public_key)))
+    {
+      GNUNET_break_op(0);
+      return GNUNET_NO;
+    }
   return GNUNET_YES;
 }
 
@@ -985,39 +955,39 @@ verify_message_crypto (const struct GNUNET_NSE_FloodMessage *incoming_flood)
  *
  * @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)
+ * @param value the `struct NSEPeerEntry *` of a peer to transmit to
+ * @return #GNUNET_OK (continue to iterate)
  */
 static int
-update_flood_times (void *cls, const struct GNUNET_HashCode * key, void *value)
+update_flood_times(void *cls,
+                   const struct GNUNET_PeerIdentity *key,
+                   void *value)
 {
   struct NSEPeerEntry *exclude = cls;
   struct NSEPeerEntry *peer_entry = value;
   struct GNUNET_TIME_Relative delay;
 
-  if (NULL != peer_entry->th)
-    return GNUNET_OK;           /* already active */
+  (void)key;
   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... */
-    if ( (GNUNET_SCHEDULER_NO_TASK == peer_entry->transmit_task) &&
-        (NULL == peer_entry->th) )
+    return GNUNET_OK; /* trigger of the update */
+  if (GNUNET_NO == peer_entry->previous_round)
     {
-        GNUNET_break (0);
+      /* still stuck in previous round, no point to update, check that
+       * we are active here though... */
+      if (NULL == peer_entry->transmit_task)
+        {
+          GNUNET_break(0);
+        }
+      return GNUNET_OK;
     }
-    return GNUNET_OK;
-  }
-  if (GNUNET_SCHEDULER_NO_TASK != peer_entry->transmit_task)
-  {
-    GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
-    peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
-  }
-  delay = get_transmit_delay (0);
+  if (NULL != peer_entry->transmit_task)
+    {
+      GNUNET_SCHEDULER_cancel(peer_entry->transmit_task);
+      peer_entry->transmit_task = NULL;
+    }
+  delay = get_transmit_delay(0);
   peer_entry->transmit_task =
-      GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, peer_entry);
+    GNUNET_SCHEDULER_add_delayed(delay, &transmit_task_cb, peer_entry);
   return GNUNET_OK;
 }
 
@@ -1025,212 +995,212 @@ update_flood_times (void *cls, const struct GNUNET_HashCode * key, void *value)
 /**
  * Core handler for size estimate flooding messages.
  *
- * @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'
+ * @param cls peer this message is from
+ * @param incoming_flood received message
  */
-static int
-handle_p2p_size_estimate (void *cls, const struct GNUNET_PeerIdentity *peer,
-                          const struct GNUNET_MessageHeader *message)
+static void
+handle_p2p_estimate(void *cls,
+                    const struct GNUNET_NSE_FloodMessage *incoming_flood)
 {
-  const struct GNUNET_NSE_FloodMessage *incoming_flood;
+  struct NSEPeerEntry *peer_entry = cls;
   struct GNUNET_TIME_Absolute ts;
-  struct NSEPeerEntry *peer_entry;
   uint32_t matching_bits;
   unsigned int idx;
 
-#if ENABLE_HISTOGRAM
-  if (NULL != wh)
-    GNUNET_break (GNUNET_OK == GNUNET_BIO_write_int64 (wh, GNUNET_TIME_absolute_get ().abs_value));
+#if ENABLE_NSE_HISTOGRAM
+  {
+    uint64_t t;
+
+    t = GNUNET_TIME_absolute_get().abs_value_us;
+    if (NULL != lh)
+      GNUNET_TESTBED_LOGGER_write(lh, &t, sizeof(uint64_t));
+    if (NULL != histogram)
+      GNUNET_BIO_write_int64(histogram, t);
+  }
 #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);
+  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_EccPublicKeyBinaryEncoded),
-                        &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);
+    GNUNET_snprintf(origin,
+                    sizeof(origin),
+                    "%s",
+                    GNUNET_i2s(&incoming_flood->origin));
+    GNUNET_snprintf(pred, sizeof(pred), "%s", GNUNET_i2s(peer_entry->id));
+    GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+               "Flood at %s from `%s' via `%s' at `%s' with bits %u\n",
+               GNUNET_STRINGS_absolute_time_to_string(
+                 GNUNET_TIME_absolute_ntoh(incoming_flood->timestamp)),
+               origin,
+               pred,
+               GNUNET_i2s(&my_identity),
+               (unsigned int)matching_bits);
   }
 #endif
 
-  peer_entry = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
-  if (NULL == peer_entry)
-  {
-    GNUNET_break (0);
-    return GNUNET_OK;
-  }
-#if ENABLE_HISTOGRAM
+#if ENABLE_NSE_HISTOGRAM
   peer_entry->received_messages++;
-  if (peer_entry->transmitted_messages > 0 && 
+  if (peer_entry->transmitted_messages > 0 &&
       peer_entry->last_transmitted_size >= matching_bits)
     GNUNET_STATISTICS_update(stats, "# cross messages", 1, GNUNET_NO);
 #endif
 
-  ts = GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp);
-  if (ts.abs_value == current_timestamp.abs_value)
+  ts = GNUNET_TIME_absolute_ntoh(incoming_flood->timestamp);
+  if (ts.abs_value_us == current_timestamp.abs_value_us)
     idx = estimate_index;
-  else if (ts.abs_value ==
-           current_timestamp.abs_value - gnunet_nse_interval.rel_value)
+  else if (ts.abs_value_us ==
+           current_timestamp.abs_value_us - gnunet_nse_interval.rel_value_us)
     idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
-  else if (ts.abs_value == next_timestamp.abs_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))
+  else if (ts.abs_value_us == next_timestamp.abs_value_us)
     {
-      GNUNET_break_op (0);
-      return GNUNET_OK;
+      if (matching_bits <= ntohl(next_message.matching_bits))
+        return; /* ignore, simply too early/late */
+      if (GNUNET_YES != verify_message_crypto(incoming_flood))
+        {
+          GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
+                     "Peer %s is likely ill-configured!\n",
+                     GNUNET_i2s(peer_entry->id));
+          GNUNET_break_op(0);
+          return;
+        }
+      next_message = *incoming_flood;
+      return;
     }
-    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;
+      GNUNET_STATISTICS_update(stats,
+                               "# flood messages discarded (clock skew too large)",
+                               1,
+                               GNUNET_NO);
+      return;
     }
-    /* got up-to-date information for current round, cancel transmission to
-     * this peer altogether */
-    if (GNUNET_SCHEDULER_NO_TASK != peer_entry->transmit_task)
+  if (0 == (GNUNET_memcmp(peer_entry->id, &my_identity)))
     {
-      GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
-      peer_entry->transmit_task = GNUNET_SCHEDULER_NO_TASK;
+      /* send to self, update our own estimate IF this also comes from us! */
+      if (0 == GNUNET_memcmp(&incoming_flood->origin, &my_identity))
+        update_network_size_estimate();
+      return;
     }
-    if (NULL != peer_entry->th)
+  if (matching_bits == ntohl(size_estimate_messages[idx].matching_bits))
     {
-      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;
+      /* 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;
+        }
+      /* got up-to-date information for current round, cancel transmission to
+       * this peer altogether */
+      if (NULL != peer_entry->transmit_task)
+        {
+          GNUNET_SCHEDULER_cancel(peer_entry->transmit_task);
+          peer_entry->transmit_task = NULL;
+        }
+      return;
     }
-    /* push back our result now, that peer is spreading bad information... */
-    if (NULL == peer_entry->th)
+  if (matching_bits < ntohl(size_estimate_messages[idx].matching_bits))
     {
-      if (peer_entry->transmit_task != GNUNET_SCHEDULER_NO_TASK)
-        GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
+      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->transmit_task)
+        GNUNET_SCHEDULER_cancel(peer_entry->transmit_task);
       peer_entry->transmit_task =
-          GNUNET_SCHEDULER_add_now (&transmit_task_cb, peer_entry);
+        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;
     }
-    /* 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));
+  if (GNUNET_YES != verify_message_crypto(incoming_flood))
+    {
+      GNUNET_break_op(0);
+      return;
+    }
+  GNUNET_assert(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.
    */
   peer_entry->previous_round = GNUNET_YES;
   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;
-      }
-  }
+      if (NULL != peer_entry->transmit_task)
+        {
+          GNUNET_SCHEDULER_cancel(peer_entry->transmit_task);
+          peer_entry->transmit_task = NULL;
+        }
+    }
   size_estimate_messages[idx] = *incoming_flood;
   size_estimate_messages[idx].hop_count =
-      htonl (ntohl (incoming_flood->hop_count) + 1);
+    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);
+    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 ();
+  update_network_size_estimate();
 
   /* flood to rest */
-  GNUNET_CONTAINER_multihashmap_iterate (peers, &update_flood_times,
-                                         peer_entry);
-  return GNUNET_OK;
+  GNUNET_CONTAINER_multipeermap_iterate(peers,
+                                        &update_flood_times,
+                                        peer_entry);
 }
 
 
-
 /**
  * Method called whenever a peer connects. Sets up the PeerEntry and
  * schedules the initial size info transmission to this peer.
  *
  * @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)
+static void *
+handle_core_connect(void *cls,
+                    const struct GNUNET_PeerIdentity *peer,
+                    struct GNUNET_MQ_Handle *mq)
 {
   struct NSEPeerEntry *peer_entry;
 
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%s' connected to us\n",
-              GNUNET_i2s (peer));
-  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));
+  (void)cls;
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+             "Peer `%s' connected to us\n",
+             GNUNET_i2s(peer));
+  /* set our default transmission options */
+  GNUNET_MQ_set_options(mq, NSE_PRIORITY);
+  /* create our peer entry for this peer */
+  peer_entry = GNUNET_new(struct NSEPeerEntry);
+  peer_entry->id = peer;
+  peer_entry->mq = mq;
+  GNUNET_assert(GNUNET_OK ==
+                GNUNET_CONTAINER_multipeermap_put(
+                  peers,
+                  peer_entry->id,
+                  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 connected", 1, GNUNET_NO);
+    GNUNET_SCHEDULER_add_delayed(get_transmit_delay(-1),
+                                 &transmit_task_cb,
+                                 peer_entry);
+  GNUNET_STATISTICS_update(stats, "# peers connected", 1, GNUNET_NO);
+  return peer_entry;
 }
 
 
@@ -1240,93 +1210,110 @@ handle_core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
  *
  * @param cls closure
  * @param peer peer identity this notification is about
+ * @parma internal_cls the `struct NSEPeerEntry` for the @a peer
  */
 static void
-handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+handle_core_disconnect(void *cls,
+                       const struct GNUNET_PeerIdentity *peer,
+                       void *internal_cls)
 {
-  struct NSEPeerEntry *pos;
+  struct NSEPeerEntry *pos = internal_cls;
+
+  (void)cls;
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
+             "Peer `%s' disconnected from us\n",
+             GNUNET_i2s(peer));
+  GNUNET_assert(GNUNET_YES ==
+                GNUNET_CONTAINER_multipeermap_remove(peers, peer, pos));
+  if (NULL != pos->transmit_task)
+    {
+      GNUNET_SCHEDULER_cancel(pos->transmit_task);
+      pos->transmit_task = NULL;
+    }
+  GNUNET_free(pos);
+  GNUNET_STATISTICS_update(stats, "# peers connected", -1, GNUNET_NO);
+}
 
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%s' disconnected from us\n",
-              GNUNET_i2s (peer));
-  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);
-    pos->transmit_task = GNUNET_SCHEDULER_NO_TASK;
-  }
-  if (NULL != pos->th)
-  {
-    GNUNET_CORE_notify_transmit_ready_cancel (pos->th);
-    pos->th = NULL;
-  }
-  GNUNET_free (pos);
-  GNUNET_STATISTICS_update (stats, "# peers connected", -1, GNUNET_NO);
+
+#if ENABLE_NSE_HISTOGRAM
+/**
+ * Functions of this type are called to notify a successful transmission of the
+ * message to the logger service
+ *
+ * @param cls NULL
+ * @param size the amount of data sent (ignored)
+ */
+static void
+flush_comp_cb(void *cls, size_t size)
+{
+  (void)cls;
+  (void)size;
+  GNUNET_TESTBED_LOGGER_disconnect(lh);
+  lh = NULL;
 }
+#endif
 
 
 /**
  * Task run during shutdown.
  *
  * @param cls unused
- * @param tc unused
  */
 static void
-shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+shutdown_task(void *cls)
 {
-  if (GNUNET_SCHEDULER_NO_TASK != flood_task)
-  {
-    GNUNET_SCHEDULER_cancel (flood_task);
-    flood_task = GNUNET_SCHEDULER_NO_TASK;
-  }
-  if (GNUNET_SCHEDULER_NO_TASK != proof_task)
-  {
-    GNUNET_SCHEDULER_cancel (proof_task);
-    proof_task = GNUNET_SCHEDULER_NO_TASK;
-    write_proof ();             /* remember progress */
-  }
-  if (NULL != keygen)
-  {
-    GNUNET_CRYPTO_ecc_key_create_stop (keygen);
-    keygen = NULL;
-  }
+  (void)cls;
+  if (NULL != flood_task)
+    {
+      GNUNET_SCHEDULER_cancel(flood_task);
+      flood_task = NULL;
+    }
+  if (NULL != proof_task)
+    {
+      GNUNET_SCHEDULER_cancel(proof_task);
+      proof_task = NULL;
+      write_proof(); /* remember progress */
+    }
   if (NULL != nc)
-  {
-    GNUNET_SERVER_notification_context_destroy (nc);
-    nc = NULL;
-  }
-  if (NULL != coreAPI)
-  {
-    GNUNET_CORE_disconnect (coreAPI);
-    coreAPI = NULL;
-  }
+    {
+      GNUNET_notification_context_destroy(nc);
+      nc = NULL;
+    }
+  if (NULL != core_api)
+    {
+      GNUNET_CORE_disconnect(core_api);
+      core_api = NULL;
+    }
   if (NULL != stats)
-  {
-    GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
-    stats = NULL;
-  }
+    {
+      GNUNET_STATISTICS_destroy(stats, GNUNET_NO);
+      stats = NULL;
+    }
   if (NULL != peers)
-  {
-    GNUNET_CONTAINER_multihashmap_destroy (peers);
-    peers = NULL;
-  }
+    {
+      GNUNET_CONTAINER_multipeermap_destroy(peers);
+      peers = NULL;
+    }
   if (NULL != my_private_key)
-  {
-    GNUNET_CRYPTO_ecc_key_free (my_private_key);
-    my_private_key = NULL;
-  }
-#if ENABLE_HISTOGRAM
-  if (NULL != wh)
-  {
-    GNUNET_break (GNUNET_OK == GNUNET_BIO_write_close (wh));
-    wh = NULL;
-  }
+    {
+      GNUNET_free(my_private_key);
+      my_private_key = NULL;
+    }
+#if ENABLE_NSE_HISTOGRAM
+  if (NULL != logger_test)
+    {
+      GNUNET_CLIENT_service_test_cancel(logger_test);
+      logger_test = NULL;
+    }
+  if (NULL != lh)
+    {
+      GNUNET_TESTBED_LOGGER_flush(lh, &flush_comp_cb, NULL);
+    }
+  if (NULL != histogram)
+    {
+      GNUNET_BIO_write_close(histogram);
+      histogram = NULL;
+    }
 #endif
 }
 
@@ -1335,227 +1322,270 @@ shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  * Called on core init/fail.
  *
  * @param cls service closure
- * @param server handle to the server for this service
  * @param identity the public identity of this peer
  */
 static void
-core_init (void *cls, struct GNUNET_CORE_Handle *server,
-           const struct GNUNET_PeerIdentity *identity)
+core_init(void *cls, const struct GNUNET_PeerIdentity *identity)
 {
   struct GNUNET_TIME_Absolute now;
   struct GNUNET_TIME_Absolute prev_time;
 
-  if (NULL == server)
-  {
-    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;
+  (void)cls;
+  if (NULL == identity)
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Connection to core FAILED!\n");
+      GNUNET_SCHEDULER_shutdown();
+      return;
+    }
+  GNUNET_assert(0 == GNUNET_memcmp(&my_identity, identity));
+  now = GNUNET_TIME_absolute_get();
+  current_timestamp.abs_value_us =
+    (now.abs_value_us / gnunet_nse_interval.rel_value_us) *
+    gnunet_nse_interval.rel_value_us;
   next_timestamp =
-      GNUNET_TIME_absolute_add (current_timestamp, gnunet_nse_interval);
+    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))
-  {
-    int idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
-    prev_time.abs_value =
-        current_timestamp.abs_value - gnunet_nse_interval.rel_value;
-    setup_flood_message (idx, prev_time);
-    setup_flood_message (estimate_index, current_timestamp);
-    estimate_count++;
-  }
+  if (GNUNET_YES == check_proof_of_work(&my_identity.public_key, my_proof))
+    {
+      int idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
+      prev_time.abs_value_us =
+        current_timestamp.abs_value_us - gnunet_nse_interval.rel_value_us;
+      setup_flood_message(idx, prev_time);
+      setup_flood_message(estimate_index, current_timestamp);
+      estimate_count++;
+    }
   flood_task =
-      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
-                                    (next_timestamp), &update_flood_message,
-                                    NULL);
+    GNUNET_SCHEDULER_add_at(next_timestamp, &update_flood_message, NULL);
 }
 
 
+#if ENABLE_NSE_HISTOGRAM
 /**
- * Callback for hostkey read/generation
+ * Function called with the status of the testbed logger service
  *
  * @param cls NULL
- * @param pk the private key
- * @param emsg error message
+ * @param status #GNUNET_YES if the service is running,
+ *               #GNUNET_NO if the service is not running
+ *               #GNUNET_SYSERR if the configuration is invalid
+ */
+static void
+status_cb(void *cls, int status)
+{
+  (void)cls;
+  logger_test = NULL;
+  if (GNUNET_YES != status)
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Testbed logger not running\n");
+      return;
+    }
+  if (NULL == (lh = GNUNET_TESTBED_LOGGER_connect(cfg)))
+    {
+      GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+                 "Cannot connect to the testbed logger.  Exiting.\n");
+      GNUNET_SCHEDULER_shutdown();
+    }
+}
+#endif
+
+
+/**
+ * Handle network size estimate clients.
+ *
+ * @param cls closure
+ * @param c configuration to use
+ * @param service the initialized service
  */
 static void
-key_generation_cb (void *cls,
-                   struct GNUNET_CRYPTO_EccPrivateKey *pk,
-                   const char *emsg)
+run(void *cls,
+    const struct GNUNET_CONFIGURATION_Handle *c,
+    struct GNUNET_SERVICE_Handle *service)
 {
-  static const struct GNUNET_SERVER_MessageHandler handlers[] = {
-    {&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,
-     sizeof (struct GNUNET_NSE_FloodMessage)},
-    {NULL, 0, 0}
-  };
+  struct GNUNET_MQ_MessageHandler core_handlers[] =
+  { GNUNET_MQ_hd_fixed_size(p2p_estimate,
+                            GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD,
+                            struct GNUNET_NSE_FloodMessage,
+                            NULL),
+    GNUNET_MQ_handler_end() };
   char *proof;
+  struct GNUNET_CRYPTO_EddsaPrivateKey *pk;
+
+  (void)cls;
+  (void)service;
+  cfg = c;
+  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time(cfg,
+                                                       "NSE",
+                                                       "INTERVAL",
+                                                       &gnunet_nse_interval))
+    {
+      GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR, "NSE", "INTERVAL");
+      GNUNET_SCHEDULER_shutdown();
+      return;
+    }
+  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time(cfg,
+                                                       "NSE",
+                                                       "WORKDELAY",
+                                                       &proof_find_delay))
+    {
+      GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR, "NSE", "WORKDELAY");
+      GNUNET_SCHEDULER_shutdown();
+      return;
+    }
+  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number(cfg,
+                                                         "NSE",
+                                                         "WORKBITS",
+                                                         &nse_work_required))
+    {
+      GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR, "NSE", "WORKBITS");
+      GNUNET_SCHEDULER_shutdown();
+      return;
+    }
+  if (nse_work_required >= sizeof(struct GNUNET_HashCode) * 8)
+    {
+      GNUNET_log_config_invalid(GNUNET_ERROR_TYPE_ERROR,
+                                "NSE",
+                                "WORKBITS",
+                                _("Value is too large.\n"));
+      GNUNET_SCHEDULER_shutdown();
+      return;
+    }
 
-  keygen = NULL;
-  if (NULL == pk)
+#if ENABLE_NSE_HISTOGRAM
   {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                _("NSE service could not access hostkey: %s\n"),
-               emsg);
-    GNUNET_SCHEDULER_shutdown ();
-    return;
+    char *histogram_dir;
+    char *histogram_fn;
+
+    if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_filename(cfg,
+                                                             "NSE",
+                                                             "HISTOGRAM_DIR",
+                                                             &histogram_dir))
+      {
+        GNUNET_assert(
+          0 < GNUNET_asprintf(&histogram_fn, "%s/timestamps", histogram_dir));
+        GNUNET_free(histogram_dir);
+        histogram = GNUNET_BIO_write_open(histogram_fn);
+        if (NULL == histogram)
+          GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
+                     "Unable to open histogram file `%s'\n",
+                     histogram_fn);
+        GNUNET_free(histogram_fn);
+      }
+    logger_test = GNUNET_CLIENT_service_test("testbed-logger",
+                                             cfg,
+                                             GNUNET_TIME_UNIT_SECONDS,
+                                             &status_cb,
+                                             NULL);
   }
+#endif
+
+  GNUNET_SCHEDULER_add_shutdown(&shutdown_task, NULL);
+  pk = GNUNET_CRYPTO_eddsa_key_create_from_configuration(cfg);
+  GNUNET_assert(NULL != pk);
   my_private_key = pk;
-  GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
-  GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
-                      &my_identity.hashPubKey);
+  GNUNET_CRYPTO_eddsa_key_get_public(my_private_key, &my_identity.public_key);
   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"));
-    GNUNET_CRYPTO_ecc_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))))
+      GNUNET_CONFIGURATION_get_value_filename(cfg, "NSE", "PROOFFILE", &proof))
+    {
+      GNUNET_log_config_missing(GNUNET_ERROR_TYPE_ERROR, "NSE", "PROOFFILE");
+      GNUNET_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);
+  GNUNET_free(proof);
   proof_task =
-      GNUNET_SCHEDULER_add_with_priority (GNUNET_SCHEDULER_PRIORITY_IDLE,
-                                          &find_proof, NULL);
+    GNUNET_SCHEDULER_add_with_priority(GNUNET_SCHEDULER_PRIORITY_IDLE,
+                                       &find_proof,
+                                       NULL);
 
-  peers = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
-  GNUNET_SERVER_add_handlers (srv, handlers);
-  nc = GNUNET_SERVER_notification_context_create (srv, 1);
+  peers = GNUNET_CONTAINER_multipeermap_create(128, GNUNET_YES);
+  nc = GNUNET_notification_context_create(1);
   /* Connect to core service and register core handlers */
-  coreAPI = GNUNET_CORE_connect (cfg,   /* Main configuration */
-                                 NULL,       /* Closure passed to functions */
-                                 &core_init,    /* Call core_init once connected */
-                                 &handle_core_connect,  /* Handle connects */
-                                 &handle_core_disconnect,       /* Handle disconnects */
-                                 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 (NULL == coreAPI)
-  {
-    GNUNET_SCHEDULER_shutdown ();
-    return;
-  }
-#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
-  stats = GNUNET_STATISTICS_create ("nse", cfg);
-  GNUNET_SERVER_resume (srv);
+  core_api =
+    GNUNET_CORE_connect(cfg,  /* Main configuration */
+                        NULL,  /* Closure passed to functions */
+                        &core_init,  /* Call core_init once connected */
+                        &handle_core_connect,  /* Handle connects */
+                        &handle_core_disconnect,  /* Handle disconnects */
+                        core_handlers);  /* Register these handlers */
+  if (NULL == core_api)
+    {
+      GNUNET_SCHEDULER_shutdown();
+      return;
+    }
+  stats = GNUNET_STATISTICS_create("nse", cfg);
 }
 
 
 /**
- * Handle network size estimate clients.
+ * Callback called when a client connects to the service.
  *
- * @param cls closure
- * @param server the initialized server
- * @param c configuration to use
+ * @param cls closure for the service
+ * @param c the new client that connected to the service
+ * @param mq the message queue used to send messages to the client
+ * @return @a c
  */
-static void
-run (void *cls, 
-     struct GNUNET_SERVER_Handle *server,
-     const struct GNUNET_CONFIGURATION_Handle *c)
+static void *
+client_connect_cb(void *cls,
+                  struct GNUNET_SERVICE_Client *c,
+                  struct GNUNET_MQ_Handle *mq)
 {
-  char *keyfile;
-
-  cfg = c;
-  srv = server;  
-  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,
-                _
-                ("%s service is lacking key configuration settings (%s).  Exiting.\n"),
-                "NSE", "interval/workdelay/workbits");
-    GNUNET_SCHEDULER_shutdown ();
-    return;
-  }
-  if (nse_work_required >= sizeof (struct 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 (c, "PEER", "PRIVATE_KEY",
-                                               &keyfile))
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                _
-                ("%s service is lacking key configuration settings (%s).  Exiting.\n"),
-                "NSE", "peer/privatekey");
-    GNUNET_SCHEDULER_shutdown ();
-    return;
-  }
-  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
-                                NULL);
-  GNUNET_SERVER_suspend (srv);
-  keygen = GNUNET_CRYPTO_ecc_key_create_start (keyfile, &key_generation_cb, NULL);
-  GNUNET_free (keyfile);
+  (void)cls;
+  (void)mq;
+  return c;
 }
 
 
 /**
- * The main function for the network size estimation service.
+ * Callback called when a client disconnected from the service
  *
- * @param argc number of arguments from the command line
- * @param argv command line arguments
- * @return 0 ok, 1 on error
+ * @param cls closure for the service
+ * @param c the client that disconnected
+ * @param internal_cls should be equal to @a c
  */
-int
-main (int argc, char *const *argv)
+static void
+client_disconnect_cb(void *cls,
+                     struct GNUNET_SERVICE_Client *c,
+                     void *internal_cls)
 {
-  return (GNUNET_OK ==
-          GNUNET_SERVICE_run (argc, argv, "nse", GNUNET_SERVICE_OPTION_NONE,
-                              &run, NULL)) ? 0 : 1;
+  (void)cls;
+  GNUNET_assert(c == internal_cls);
 }
 
 
-#ifdef LINUX
+/**
+ * Define "main" method using service macro.
+ */
+GNUNET_SERVICE_MAIN("nse",
+                    GNUNET_SERVICE_OPTION_NONE,
+                    &run,
+                    &client_connect_cb,
+                    &client_disconnect_cb,
+                    NULL,
+                    GNUNET_MQ_hd_fixed_size(start,
+                                            GNUNET_MESSAGE_TYPE_NSE_START,
+                                            struct GNUNET_MessageHeader,
+                                            NULL),
+                    GNUNET_MQ_handler_end());
+
+
+#if defined(LINUX) && defined(__GLIBC__)
 #include <malloc.h>
 
 /**
  * MINIMIZE heap size (way below 128k) since this process doesn't need much.
  */
-void __attribute__ ((constructor)) GNUNET_ARM_memory_init ()
+void __attribute__ ((constructor)) GNUNET_ARM_memory_init()
 {
-  mallopt (M_TRIM_THRESHOLD, 4 * 1024);
-  mallopt (M_TOP_PAD, 1 * 1024);
-  malloc_trim (0);
+  mallopt(M_TRIM_THRESHOLD, 4 * 1024);
+  mallopt(M_TOP_PAD, 1 * 1024);
+  malloc_trim(0);
 }
 #endif
 
 
-
 /* end of gnunet-service-nse.c */