[GNUnet-SVN] r15952 - gnunet/src/nse

[gnunet]

Author: nevans
Date: 2011-07-14 12:51:11 +0200 (Thu, 14 Jul 2011)
New Revision: 15952

Modified:
   gnunet/src/nse/Makefile.am
   gnunet/src/nse/gnunet-service-nse.c
   gnunet/src/nse/nse.h
Log:
nse changes

Modified: gnunet/src/nse/Makefile.am
===================================================================
--- gnunet/src/nse/Makefile.am  2011-07-14 09:16:58 UTC (rev 15951)
+++ gnunet/src/nse/Makefile.am  2011-07-14 10:51:11 UTC (rev 15952)
@@ -40,6 +40,7 @@
   $(top_builddir)/src/nse/libgnunetnse.la \
   $(top_builddir)/src/util/libgnunetutil.la \
   $(top_builddir)/src/core/libgnunetcore.la \
+  -lm \
   $(GN_LIBINTL)
 gnunet_service_nse_DEPENDENCIES = \
   libgnunetnse.la                               

Modified: gnunet/src/nse/gnunet-service-nse.c
===================================================================
--- gnunet/src/nse/gnunet-service-nse.c 2011-07-14 09:16:58 UTC (rev 15951)
+++ gnunet/src/nse/gnunet-service-nse.c 2011-07-14 10:51:11 UTC (rev 15952)
@@ -41,6 +41,7 @@
 #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_core_service.h"
@@ -52,7 +53,7 @@
 
 #define DEFAULT_CORE_QUEUE_SIZE 32
 
-#define MILLISECONDS_PER_DAY 86400000
+#define DEFAULT_NSE_PRIORITY 0
 
 /**
  * Entry in the list of clients which
@@ -78,6 +79,37 @@
 };
 
 /**
+ * Per-peer information.
+ */
+struct NSEPeerEntry
+{
+  /**
+   * Next peer entry (DLL)
+   */
+  struct NSEPeerEntry *next;
+
+  /**
+   *  Prev peer entry (DLL)
+   */
+  struct NSEPeerEntry *prev;
+
+  /**
+   * Pending message for this peer.
+   */
+  struct GNUNET_MessageHeader *pending_message;
+
+  /**
+   * Core handle for sending messages to this peer.
+   */
+  struct GNUNET_CORE_TransmitHandle *th;
+
+  /**
+   * What is the identity of the peer?
+   */
+  struct GNUNET_PeerIdentity id;
+};
+
+/**
  * Handle to our current configuration.
  */
 static const struct GNUNET_CONFIGURATION_Handle *cfg;
@@ -85,16 +117,21 @@
 /**
  * Handle to the core service.
  */
-struct GNUNET_CORE_Handle *coreAPI;
+static struct GNUNET_CORE_Handle *coreAPI;
 
 /**
- * Copy of this peer's identity.
+ * Head of global list of peers.
  */
-static struct GNUNET_PeerIdentity my_identity;
+static struct NSEPeerEntry *peers_head;
 
 /**
  * Head of global list of clients.
  */
+static struct NSEPeerEntry *peers_tail;
+
+/**
+ * Head of global list of clients.
+ */
 static struct ClientListEntry *cle_head;
 
 /**
@@ -104,6 +141,8 @@
 
 /**
  * The current network size estimate.
+ * Number of bits matching on average
+ * thus far.
  */
 static double current_size_estimate;
 
@@ -115,16 +154,31 @@
 
 /**
  * Array of the last DEFAULT_HISTORY_SIZE
- * network size estimates.
+ * network size estimates (matching bits, actually).
  */
-//static double *size_estimates[DEFAULT_HISTORY_SIZE];
+static unsigned int size_estimates[DEFAULT_HISTORY_SIZE];
 
 /**
+ * Array of size estimate messages.
+ */
+static struct GNUNET_NSE_FloodMessage 
size_estimate_messages[DEFAULT_HISTORY_SIZE];
+
+/**
+ * Index of most recent estimate.
+ */
+static unsigned int estimate_index;
+
+/**
  * Task scheduled to send flood message.
  */
 static GNUNET_SCHEDULER_TaskIdentifier flood_task;
 
 /**
+ * Task to schedule flood message and update state.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier schedule_flood_task;
+
+/**
  * Notification context, simplifies client broadcasts.
  */
 static struct GNUNET_SERVER_NotificationContext *nc;
@@ -132,7 +186,7 @@
 /**
  * The previous major time.
  */
-struct GNUNET_TIME_Absolute previous_timestamp;
+static struct GNUNET_TIME_Absolute previous_timestamp;
 
 /**
  * The next major time.
@@ -150,6 +204,26 @@
 static struct GNUNET_NSE_ClientMessage current_estimate_message;
 
 /**
+ * The public key of this peer.
+ */
+static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
+
+/**
+ * The private key of this peer.
+ */
+static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
+
+/**
+ * The peer identity of this peer.
+ */
+static struct GNUNET_PeerIdentity my_identity;
+
+/**
+ * Our flood message, updated whenever a flood is sent.
+ */
+static struct GNUNET_NSE_FloodMessage flood_message;
+
+/**
  * Handler for START message from client, triggers an
  * immediate current network estimate notification.
  * Also, we remember the client for updates upon future
@@ -172,46 +246,276 @@
   GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "NSE", "Received START message 
from client\n");
 #endif
   GNUNET_SERVER_notification_context_add (nc, client);
-  GNUNET_SERVER_notification_context_unicast (nc, client,
-                                              &current_estimate_message.header,
-                                              GNUNET_NO);
   GNUNET_SERVER_receive_done(client, GNUNET_OK);
 }
 
+
 /**
+ * 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)
+{
+  struct NSEPeerEntry *peer_entry = cls;
+  char *cbuf = buf;
+
+  size_t msize;
+  peer_entry->th = NULL;
+  if (buf == NULL) /* client disconnected */
+    return 0;
+
+  if (peer_entry->pending_message == NULL)
+    return 0;
+
+  msize = ntohs(peer_entry->pending_message->size);
+  if (msize <= size)
+    memcpy(cbuf, peer_entry->pending_message, msize);
+
+  return msize;
+}
+
+/**
+ * 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.
+ *
+ * @param message the network flood message
+ */
+static void update_network_size_estimate(struct GNUNET_NSE_FloodMessage 
*message)
+{
+  unsigned int i;
+  unsigned int count;
+  double average;
+
+  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,
+                                                
&current_estimate_message.header,
+                                                GNUNET_NO);
+}
+
+static void
+send_flood_message (void *cls,
+                    const struct GNUNET_SCHEDULER_TaskContext * tc);
+
+/**
+ * Schedule a flood message to be sent.
+ *
+ * @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)
+{
+  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;
+
+  schedule_flood_task = GNUNET_SCHEDULER_NO_TASK;
+  if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+    return;
+
+  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);
+    }
+
+  /* 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);
+
+  GNUNET_CRYPTO_hash(&next_timestamp.abs_value, sizeof(uint64_t), 
&timestamp_hash);
+  matching_bits = GNUNET_CRYPTO_hash_matching_bits(&timestamp_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);
+
+  /*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));
+
+  fprintf(stderr, "my id matches %d bits, offset is %lu\n", matching_bits, 
(uint64_t)millisecond_offset);
+
+  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);
+
+}
+
+/**
  * Core handler for size estimate flooding messages.
  *
- * @param cls closure
+ * @param cls closure unused
  * @param message message
- * @param peer peer identity this notification is about
- * @param atsi performance data
+ * @param peer peer identity this message is from (ignored)
+ * @param atsi performance data (ignored)
  *
  */
 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)
+handle_p2p_size_estimate(void *cls, const struct GNUNET_PeerIdentity *peer,
+                         const struct GNUNET_MessageHeader *message,
+                         const struct GNUNET_TRANSPORT_ATS_Information *atsi)
 {
+  struct GNUNET_NSE_FloodMessage *incoming_flood;
 
+  if (ntohs(message->size) != sizeof(struct GNUNET_NSE_FloodMessage))
+    return GNUNET_NO;
+
+  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);
+
   return GNUNET_OK;
 }
 
-
 /**
- * Send a flood message containing our peer's public key
- * and the hashed current timestamp.
+ * Send a flood message.
+ *
+ * If we've gotten here, it means we haven't received
+ * a network size estimate message closer than ours.
  */
 static void
 send_flood_message (void *cls,
                     const struct GNUNET_SCHEDULER_TaskContext * tc)
 {
+  struct NSEPeerEntry *peer_entry;
+
+  flood_task = GNUNET_SCHEDULER_NO_TASK;
   if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
     return;
+
+  peer_entry = peers_head;
+
+  while (peer_entry != NULL)
+    {
+      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;
+    }
+
+  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);
 }
 
 /**
+ * Method called whenever a peer connects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ * @param atsi performance data
+ */
+static void
+handle_core_connect (void *cls,
+                     const struct GNUNET_PeerIdentity *peer,
+                     const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+{
+  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);
+}
+
+
+/**
+ * Method called whenever a peer disconnects.
+ *
+ * @param cls closure
+ * @param peer peer identity this notification is about
+ */
+static void
+handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+{
+  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 (pos->th != NULL)
+    GNUNET_CORE_notify_transmit_ready_cancel(pos->th);
+  GNUNET_CONTAINER_DLL_remove(peers_head, peers_tail, pos);
+  GNUNET_free(pos);
+}
+
+
+/**
  * A client disconnected. Remove it from the
  * global DLL of clients.
  *
@@ -254,6 +558,8 @@
 {
   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))
@@ -275,40 +581,6 @@
 
 
 /**
- * Task to schedule a flood message to be sent.
- *
- * @param cls closure
- * @param tc context information (why was this task triggered now)
- */
-static void schedule_flood_message (void *cls,
-                                    const struct
-                                    GNUNET_SCHEDULER_TaskContext * tc)
-{
-  GNUNET_HashCode timestamp_hash;
-  struct GNUNET_TIME_Absolute curr_time;
-  unsigned int matching_bits;
-
-  /* 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);
-
-  GNUNET_CRYPTO_hash(&next_timestamp.abs_value, sizeof(uint64_t), 
&timestamp_hash);
-  matching_bits = GNUNET_CRYPTO_hash_matching_bits(&timestamp_hash, 
&my_identity.hashPubKey);
-
-  GNUNET_SCHEDULER_add_delayed (
-                                GNUNET_TIME_relative_add (
-                                                          
GNUNET_TIME_relative_multiply (
-                                                                               
          increment,
-                                                                               
          matching_bits),
-                                                          
GNUNET_TIME_absolute_get_remaining (
-                                                                               
               next_timestamp)),
-                                &send_flood_message, NULL);
-}
-
-/**
  * Called on core init/fail.
  *
  * @param cls service closure
@@ -340,8 +612,21 @@
 
   /* 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_task = GNUNET_SCHEDULER_add_now(&schedule_flood_message, NULL);
+  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);
+
+  schedule_flood_task = GNUNET_SCHEDULER_add_now(&schedule_flood_message, 
NULL);
+
+  GNUNET_SERVER_notification_context_broadcast (nc,
+                                                
&current_estimate_message.header,
+                                                GNUNET_NO);
 }
 
 /**
@@ -356,6 +641,7 @@
      struct GNUNET_SERVER_Handle *server,
      const struct GNUNET_CONFIGURATION_Handle *c)
 {
+  char *keyfile;
   static const struct GNUNET_SERVER_MessageHandler handlers[] = {
     {&handle_start_message, NULL, GNUNET_MESSAGE_TYPE_NSE_START, 0},
     {NULL, NULL, 0, 0}
@@ -367,19 +653,43 @@
   };
 
   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;
+    }
+
+  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_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 */
   coreAPI = GNUNET_CORE_connect (cfg,   /* Main configuration */
                                  DEFAULT_CORE_QUEUE_SIZE,       /* queue size 
*/
                                  NULL,  /* Closure passed to functions */
                                  &core_init,    /* Call core_init once 
connected */
-                                 NULL,  /* Handle connects */
-                                 NULL,       /* Handle disconnects */
+                                 &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 */
@@ -399,9 +709,9 @@
                                            / (sizeof(GNUNET_HashCode)
                                                * 8));
   /* Set we have no idea defaults for network size estimate */
-  current_size_estimate = NAN;
+  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;

Modified: gnunet/src/nse/nse.h
===================================================================
--- gnunet/src/nse/nse.h        2011-07-14 09:16:58 UTC (rev 15951)
+++ gnunet/src/nse/nse.h        2011-07-14 10:51:11 UTC (rev 15952)
@@ -32,15 +32,7 @@
 
 #define DEBUG_NSE GNUNET_YES
 
-#define SIGNED_TIMESTAMP_SIZE sizeof(struct GNUNET_TIME_Absolute)
 
-/** FIXME: define NSE message types here. */
-
-struct GNUNET_Signed_Timestamp
-{
-  char data[SIGNED_TIMESTAMP_SIZE];
-};
-
 /**
  * Network size estimate sent from the service
  * to clients.  Contains the current size estimate
@@ -95,25 +87,45 @@
  * doesn't allow us to verify that the
  * public/private key pair were generated, right?
  */
-struct GNUNET_NSE_ReplyMessage
+struct GNUNET_NSE_FloodMessage
 {
   /**
-   * Type: GNUNET_MESSAGE_TYPE_NSE_REPLY
+   * Type: GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD
    */
   struct GNUNET_MessageHeader header;
 
   /**
+   * Magic header code(?)
+   */
+  uint16_t enc_type;
+
+  /**
+   * Number of matching bits between the hash
+   * of timestamp and the initiator's public
+   * key.
+   */
+  uint16_t distance;
+
+  /**
    * The current timestamp value (which all
-   * peers should agree on) signed by the
-   * private key of the initiating peer.
+   * peers should agree on).
    */
-  struct GNUNET_Signed_Timestamp timestamp;
+  struct GNUNET_TIME_AbsoluteNBO timestamp;
 
   /**
-   * Public key of the originator, signed timestamp
-   * is decrypted by this.
+   * Public key of the originator.
    */
   struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
+
+  /**
+   * FIXME: use, document.
+   */
+  uint32_t proof_of_work;
+
+  /**
+   * FIXME: use, document.
+   */
+  struct GNUNET_CRYPTO_RsaSignature signature;
 };
 
 #endif