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[GNUnet-SVN] [gnunet] 02/04: RPS API: Add creation, deletion of Subs


From: gnunet
Subject: [GNUnet-SVN] [gnunet] 02/04: RPS API: Add creation, deletion of Subs
Date: Thu, 11 Oct 2018 14:48:53 +0200

This is an automated email from the git hooks/post-receive script.

julius-buenger pushed a commit to branch master
in repository gnunet.

commit fbbf0db19d08fe54f5b51c82b6cb1c9c7a2d040d
Author: Julius Bünger <address@hidden>
AuthorDate: Thu Oct 11 14:39:48 2018 +0200

    RPS API: Add creation, deletion of Subs
---
 src/rps/gnunet-service-rps.c | 974 ++++++++++++++++++++++++-------------------
 src/rps/rps.h                |  44 ++
 src/rps/rps_api.c            |  61 +++
 3 files changed, 658 insertions(+), 421 deletions(-)

diff --git a/src/rps/gnunet-service-rps.c b/src/rps/gnunet-service-rps.c
index d1c169239..b41a77074 100644
--- a/src/rps/gnunet-service-rps.c
+++ b/src/rps/gnunet-service-rps.c
@@ -36,11 +36,10 @@
 
 #include <math.h>
 #include <inttypes.h>
+#include <string.h>
 
 #define LOG(kind, ...) GNUNET_log(kind, __VA_ARGS__)
 
-// TODO modify @brief in every file
-
 // TODO check for overflows
 
 // TODO align message structs
@@ -149,9 +148,9 @@ struct ChannelCtx;
 struct PeerContext
 {
   /**
-   * The SubSampler this context belongs to.
+   * The Sub this context belongs to.
    */
-  struct SubSampler *ss;
+  struct Sub *sub;
 
   /**
    * Message queue open to client
@@ -280,24 +279,17 @@ struct AttackedPeer
 #endif /* ENABLE_MALICIOUS */
 
 /**
- * @brief One SubSampler.
+ * @brief One Sub.
  *
  * Essentially one instance of brahms that only connects to other instances
  * with the same (secret) value.
  */
-struct SubSampler
+struct Sub
 {
   /**
-   * @brief Port used for cadet.
-   *
-   * Don't compute multiple times through making it global
-   */
-  struct GNUNET_HashCode port;
-
-  /**
-   * Handler to CADET.
+   * @brief Hash of the shared value that defines Subs.
    */
-  struct GNUNET_CADET_Handle *cadet_handle;
+  struct GNUNET_HashCode hash;
 
   /**
    * @brief Port to communicate to other peers.
@@ -417,6 +409,11 @@ static const struct GNUNET_CONFIGURATION_Handle *cfg;
 struct GNUNET_STATISTICS_Handle *stats;
 
 /**
+ * Handler to CADET.
+ */
+struct GNUNET_CADET_Handle *cadet_handle;
+
+/**
  * Our own identity.
  */
 static struct GNUNET_PeerIdentity own_identity;
@@ -516,12 +513,12 @@ static uint32_t push_limit = 10000;
 #endif /* ENABLE_MALICIOUS */
 
 /**
- * @brief Main SubSampler.
+ * @brief Main Sub.
  *
  * This is run in any case by all peers and connects to all peers without
  * specifying a shared value.
  */
-static struct SubSampler *mss;
+static struct Sub *msub;
 
 /**
  * @brief Maximum number of valid peers to keep.
@@ -529,12 +526,18 @@ static struct SubSampler *mss;
  */
 static const uint32_t num_valid_peers_max = UINT32_MAX;
 
-
 /***********************************************************************
  * /Globals
 ***********************************************************************/
 
 
+static void
+do_round (void *cls);
+
+static void
+do_mal_round (void *cls);
+
+
 /**
  * @brief Get the #PeerContext associated with a peer
  *
@@ -586,29 +589,29 @@ check_peer_known (const struct 
GNUNET_CONTAINER_MultiPeerMap *peer_map,
 /**
  * @brief Create a new #PeerContext and insert it into the peer map
  *
- * @param ss The SubSampler this context belongs to.
+ * @param sub The Sub this context belongs to.
  * @param peer the peer to create the #PeerContext for
  *
  * @return the #PeerContext
  */
 static struct PeerContext *
-create_peer_ctx (struct SubSampler *ss,
+create_peer_ctx (struct Sub *sub,
                  const struct GNUNET_PeerIdentity *peer)
 {
   struct PeerContext *ctx;
   int ret;
 
-  GNUNET_assert (GNUNET_NO == check_peer_known (ss->peer_map, peer));
+  GNUNET_assert (GNUNET_NO == check_peer_known (sub->peer_map, peer));
 
   ctx = GNUNET_new (struct PeerContext);
   ctx->peer_id = *peer;
-  ctx->ss = ss;
-  ret = GNUNET_CONTAINER_multipeermap_put (ss->peer_map, peer, ctx,
+  ctx->sub = sub;
+  ret = GNUNET_CONTAINER_multipeermap_put (sub->peer_map, peer, ctx,
       GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
   GNUNET_assert (GNUNET_OK == ret);
   GNUNET_STATISTICS_set (stats,
                         "# known peers",
-                        GNUNET_CONTAINER_multipeermap_size (ss->peer_map),
+                        GNUNET_CONTAINER_multipeermap_size (sub->peer_map),
                         GNUNET_NO);
   return ctx;
 }
@@ -617,20 +620,20 @@ create_peer_ctx (struct SubSampler *ss,
 /**
  * @brief Create or get a #PeerContext
  *
- * @param ss The SubSampler to which the created context belongs to
+ * @param sub The Sub to which the created context belongs to
  * @param peer the peer to get the associated context to
  *
  * @return the context
  */
 static struct PeerContext *
-create_or_get_peer_ctx (struct SubSampler *ss,
+create_or_get_peer_ctx (struct Sub *sub,
                         const struct GNUNET_PeerIdentity *peer)
 {
-  if (GNUNET_NO == check_peer_known (ss->peer_map, peer))
+  if (GNUNET_NO == check_peer_known (sub->peer_map, peer))
   {
-    return create_peer_ctx (ss, peer);
+    return create_peer_ctx (sub, peer);
   }
-  return get_peer_ctx (ss->peer_map, peer);
+  return get_peer_ctx (sub->peer_map, peer);
 }
 
 
@@ -648,13 +651,13 @@ static int
 check_connected (struct PeerContext *peer_ctx)
 {
   /* If we don't know about this peer we don't know whether it's online */
-  if (GNUNET_NO == check_peer_known (peer_ctx->ss->peer_map,
+  if (GNUNET_NO == check_peer_known (peer_ctx->sub->peer_map,
                                      &peer_ctx->peer_id))
   {
     return GNUNET_NO;
   }
   /* Get the context */
-  peer_ctx = get_peer_ctx (peer_ctx->ss->peer_map, &peer_ctx->peer_id);
+  peer_ctx = get_peer_ctx (peer_ctx->sub->peer_map, &peer_ctx->peer_id);
   /* If we have no channel to this peer we don't know whether it's online */
   if ( (NULL == peer_ctx->send_channel_ctx) &&
        (NULL == peer_ctx->recv_channel_ctx) )
@@ -943,10 +946,10 @@ get_channel (struct PeerContext *peer_ctx)
     *ctx_peer = peer_ctx->peer_id;
     peer_ctx->send_channel_ctx = add_channel_ctx (peer_ctx);
     peer_ctx->send_channel_ctx->channel =
-      GNUNET_CADET_channel_create (peer_ctx->ss->cadet_handle,
+      GNUNET_CADET_channel_create (cadet_handle,
                                    peer_ctx->send_channel_ctx, /* context */
                                    &peer_ctx->peer_id,
-                                   &peer_ctx->ss->port,
+                                   &peer_ctx->sub->hash,
                                    GNUNET_CADET_OPTION_RELIABLE,
                                    NULL, /* WindowSize handler */
                                    &cleanup_destroyed_channel, /* Disconnect 
handler */
@@ -1048,7 +1051,7 @@ mq_online_check_successful (void *cls)
     remove_pending_message (peer_ctx->online_check_pending, GNUNET_YES);
     peer_ctx->online_check_pending = NULL;
     set_peer_online (peer_ctx);
-    (void) add_valid_peer (&peer_ctx->peer_id, peer_ctx->ss->valid_peers);
+    (void) add_valid_peer (&peer_ctx->peer_id, peer_ctx->sub->valid_peers);
   }
 }
 
@@ -1187,9 +1190,9 @@ static int
 destroy_peer (struct PeerContext *peer_ctx)
 {
   GNUNET_assert (NULL != peer_ctx);
-  GNUNET_assert (NULL != peer_ctx->ss->peer_map);
+  GNUNET_assert (NULL != peer_ctx->sub->peer_map);
   if (GNUNET_NO ==
-      GNUNET_CONTAINER_multipeermap_contains (peer_ctx->ss->peer_map,
+      GNUNET_CONTAINER_multipeermap_contains (peer_ctx->sub->peer_map,
                                               &peer_ctx->peer_id))
   {
     return GNUNET_NO;
@@ -1259,15 +1262,15 @@ destroy_peer (struct PeerContext *peer_ctx)
   }
 
   if (GNUNET_YES !=
-      GNUNET_CONTAINER_multipeermap_remove_all (peer_ctx->ss->peer_map,
+      GNUNET_CONTAINER_multipeermap_remove_all (peer_ctx->sub->peer_map,
                                                 &peer_ctx->peer_id))
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
-         "removing peer from peer_ctx->ss->peer_map failed\n");
+         "removing peer from peer_ctx->sub->peer_map failed\n");
   }
   GNUNET_STATISTICS_set (stats,
                         "# known peers",
-                        GNUNET_CONTAINER_multipeermap_size 
(peer_ctx->ss->peer_map),
+                        GNUNET_CONTAINER_multipeermap_size 
(peer_ctx->sub->peer_map),
                         GNUNET_NO);
   GNUNET_free (peer_ctx);
   return GNUNET_YES;
@@ -1288,10 +1291,10 @@ peermap_clear_iterator (void *cls,
                         const struct GNUNET_PeerIdentity *key,
                         void *value)
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
   (void) value;
 
-  destroy_peer (get_peer_ctx (ss->peer_map, key));
+  destroy_peer (get_peer_ctx (sub->peer_map, key));
   return GNUNET_YES;
 }
 
@@ -1366,36 +1369,36 @@ store_peer_presistently_iterator (void *cls,
 /**
  * @brief Store the peers currently in #valid_peers to disk.
  *
- * @param ss SubSampler for which to store the valid peers
+ * @param sub Sub for which to store the valid peers
  */
 static void
-store_valid_peers (const struct SubSampler *ss)
+store_valid_peers (const struct Sub *sub)
 {
   struct GNUNET_DISK_FileHandle *fh;
   uint32_t number_written_peers;
   int ret;
 
-  if (0 == strncmp ("DISABLE", ss->filename_valid_peers, 7))
+  if (0 == strncmp ("DISABLE", sub->filename_valid_peers, 7))
   {
     return;
   }
 
-  ret = GNUNET_DISK_directory_create_for_file (ss->filename_valid_peers);
+  ret = GNUNET_DISK_directory_create_for_file (sub->filename_valid_peers);
   if (GNUNET_SYSERR == ret)
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
         "Not able to create directory for file `%s'\n",
-        ss->filename_valid_peers);
+        sub->filename_valid_peers);
     GNUNET_break (0);
   }
   else if (GNUNET_NO == ret)
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
         "Directory for file `%s' exists but is not writable for us\n",
-        ss->filename_valid_peers);
+        sub->filename_valid_peers);
     GNUNET_break (0);
   }
-  fh = GNUNET_DISK_file_open (ss->filename_valid_peers,
+  fh = GNUNET_DISK_file_open (sub->filename_valid_peers,
                               GNUNET_DISK_OPEN_WRITE |
                                   GNUNET_DISK_OPEN_CREATE,
                               GNUNET_DISK_PERM_USER_READ |
@@ -1404,19 +1407,19 @@ store_valid_peers (const struct SubSampler *ss)
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
         "Not able to write valid peers to file `%s'\n",
-        ss->filename_valid_peers);
+        sub->filename_valid_peers);
     return;
   }
   LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Writing %u valid peers to disk\n",
-      GNUNET_CONTAINER_multipeermap_size (ss->valid_peers));
+      GNUNET_CONTAINER_multipeermap_size (sub->valid_peers));
   number_written_peers =
-    GNUNET_CONTAINER_multipeermap_iterate (ss->valid_peers,
+    GNUNET_CONTAINER_multipeermap_iterate (sub->valid_peers,
                                            store_peer_presistently_iterator,
                                            fh);
   GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
   GNUNET_assert (number_written_peers ==
-      GNUNET_CONTAINER_multipeermap_size (ss->valid_peers));
+      GNUNET_CONTAINER_multipeermap_size (sub->valid_peers));
 }
 
 
@@ -1469,10 +1472,10 @@ s2i_full (const char *string_repr)
 /**
  * @brief Restore the peers on disk to #valid_peers.
  *
- * @param ss SubSampler for which to restore the valid peers
+ * @param sub Sub for which to restore the valid peers
  */
 static void
-restore_valid_peers (const struct SubSampler *ss)
+restore_valid_peers (const struct Sub *sub)
 {
   off_t file_size;
   uint32_t num_peers;
@@ -1483,16 +1486,16 @@ restore_valid_peers (const struct SubSampler *ss)
   char *str_repr;
   const struct GNUNET_PeerIdentity *peer;
 
-  if (0 == strncmp ("DISABLE", ss->filename_valid_peers, 7))
+  if (0 == strncmp ("DISABLE", sub->filename_valid_peers, 7))
   {
     return;
   }
 
-  if (GNUNET_OK != GNUNET_DISK_file_test (ss->filename_valid_peers))
+  if (GNUNET_OK != GNUNET_DISK_file_test (sub->filename_valid_peers))
   {
     return;
   }
-  fh = GNUNET_DISK_file_open (ss->filename_valid_peers,
+  fh = GNUNET_DISK_file_open (sub->filename_valid_peers,
                               GNUNET_DISK_OPEN_READ,
                               GNUNET_DISK_PERM_NONE);
   GNUNET_assert (NULL != fh);
@@ -1504,13 +1507,13 @@ restore_valid_peers (const struct SubSampler *ss)
   LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Restoring %" PRIu32 " peers from file `%s'\n",
       num_peers,
-      ss->filename_valid_peers);
+      sub->filename_valid_peers);
   for (iter_buf = buf; iter_buf < buf + file_size - 1; iter_buf += 53)
   {
     str_repr = GNUNET_strndup (iter_buf, 53);
     peer = s2i_full (str_repr);
     GNUNET_free (str_repr);
-    add_valid_peer (peer, ss->valid_peers);
+    add_valid_peer (peer, sub->valid_peers);
     LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Restored valid peer %s from disk\n",
         GNUNET_i2s_full (peer));
@@ -1518,10 +1521,10 @@ restore_valid_peers (const struct SubSampler *ss)
   iter_buf = NULL;
   GNUNET_free (buf);
   LOG (GNUNET_ERROR_TYPE_DEBUG,
-      "num_peers: %" PRIu32 ", _size (ss->valid_peers): %u\n",
+      "num_peers: %" PRIu32 ", _size (sub->valid_peers): %u\n",
       num_peers,
-      GNUNET_CONTAINER_multipeermap_size (ss->valid_peers));
-  if (num_peers != GNUNET_CONTAINER_multipeermap_size (ss->valid_peers))
+      GNUNET_CONTAINER_multipeermap_size (sub->valid_peers));
+  if (num_peers != GNUNET_CONTAINER_multipeermap_size (sub->valid_peers))
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
         "Number of restored peers does not match file size. Have probably 
duplicates.\n");
@@ -1529,33 +1532,33 @@ restore_valid_peers (const struct SubSampler *ss)
   GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fh));
   LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Restored %u valid peers from disk\n",
-      GNUNET_CONTAINER_multipeermap_size (ss->valid_peers));
+      GNUNET_CONTAINER_multipeermap_size (sub->valid_peers));
 }
 
 
 /**
  * @brief Delete storage of peers that was created with #initialise_peers ()
  *
- * @param ss SubSampler for which the storage is deleted
+ * @param sub Sub for which the storage is deleted
  */
 static void
-peers_terminate (struct SubSampler *ss)
+peers_terminate (struct Sub *sub)
 {
   if (GNUNET_SYSERR ==
-      GNUNET_CONTAINER_multipeermap_iterate (ss->peer_map,
+      GNUNET_CONTAINER_multipeermap_iterate (sub->peer_map,
                                              &peermap_clear_iterator,
-                                             ss))
+                                             sub))
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
         "Iteration destroying peers was aborted.\n");
   }
-  GNUNET_CONTAINER_multipeermap_destroy (ss->peer_map);
-  ss->peer_map = NULL;
-  store_valid_peers (ss);
-  GNUNET_free (ss->filename_valid_peers);
-  ss->filename_valid_peers = NULL;
-  GNUNET_CONTAINER_multipeermap_destroy (ss->valid_peers);
-  ss->valid_peers = NULL;
+  GNUNET_CONTAINER_multipeermap_destroy (sub->peer_map);
+  sub->peer_map = NULL;
+  store_valid_peers (sub);
+  GNUNET_free (sub->filename_valid_peers);
+  sub->filename_valid_peers = NULL;
+  GNUNET_CONTAINER_multipeermap_destroy (sub->valid_peers);
+  sub->valid_peers = NULL;
 }
 
 
@@ -1615,21 +1618,21 @@ get_valid_peers (const struct 
GNUNET_CONTAINER_MultiPeerMap *valid_peers,
  * This function is called on new peer_ids from 'external' sources
  * (client seed, cadet get_peers(), ...)
  *
- * @param ss SubSampler with the peer map that the @a peer will be added to
+ * @param sub Sub with the peer map that the @a peer will be added to
  * @param peer the new #GNUNET_PeerIdentity
  *
  * @return #GNUNET_YES if peer was inserted
  *         #GNUNET_NO  otherwise
  */
 static int
-insert_peer (struct SubSampler *ss,
+insert_peer (struct Sub *sub,
              const struct GNUNET_PeerIdentity *peer)
 {
-  if (GNUNET_YES == check_peer_known (ss->peer_map, peer))
+  if (GNUNET_YES == check_peer_known (sub->peer_map, peer))
   {
     return GNUNET_NO; /* We already know this peer - nothing to do */
   }
-  (void) create_peer_ctx (ss, peer);
+  (void) create_peer_ctx (sub, peer);
   return GNUNET_YES;
 }
 
@@ -1665,20 +1668,20 @@ check_peer_flag (const struct 
GNUNET_CONTAINER_MultiPeerMap *peer_map,
  *
  * If not known yet, insert into known peers
  *
- * @param ss SubSampler which would contain the @a peer
+ * @param sub Sub which would contain the @a peer
  * @param peer the peer whose online is to be checked
  * @return #GNUNET_YES if the check was issued
  *         #GNUNET_NO  otherwise
  */
 static int
-issue_peer_online_check (struct SubSampler *ss,
+issue_peer_online_check (struct Sub *sub,
                          const struct GNUNET_PeerIdentity *peer)
 {
   struct PeerContext *peer_ctx;
 
-  (void) insert_peer (ss, peer); // TODO even needed?
-  peer_ctx = get_peer_ctx (ss->peer_map, peer);
-  if ( (GNUNET_NO == check_peer_flag (ss->peer_map, peer, Peers_ONLINE)) &&
+  (void) insert_peer (sub, peer); // TODO even needed?
+  peer_ctx = get_peer_ctx (sub->peer_map, peer);
+  if ( (GNUNET_NO == check_peer_flag (sub->peer_map, peer, Peers_ONLINE)) &&
        (NULL == peer_ctx->online_check_pending) )
   {
     check_peer_online (peer_ctx);
@@ -1704,7 +1707,7 @@ issue_peer_online_check (struct SubSampler *ss,
 static int
 check_removable (const struct PeerContext *peer_ctx)
 {
-  if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains 
(peer_ctx->ss->peer_map,
+  if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains 
(peer_ctx->sub->peer_map,
                                                            &peer_ctx->peer_id))
   {
     return GNUNET_SYSERR;
@@ -1749,7 +1752,7 @@ check_peer_valid (const struct 
GNUNET_CONTAINER_MultiPeerMap *valid_peers,
 static void
 indicate_sending_intention (struct PeerContext *peer_ctx)
 {
-  GNUNET_assert (GNUNET_YES == check_peer_known (peer_ctx->ss->peer_map,
+  GNUNET_assert (GNUNET_YES == check_peer_known (peer_ctx->sub->peer_map,
                                                  &peer_ctx->peer_id));
   (void) get_channel (peer_ctx);
 }
@@ -1778,7 +1781,7 @@ check_peer_send_intention (const struct PeerContext 
*peer_ctx)
 /**
  * Handle the channel a peer opens to us.
  *
- * @param cls The closure - SubSampler
+ * @param cls The closure - Sub
  * @param channel The channel the peer wants to establish
  * @param initiator The peer's peer ID
  *
@@ -1793,22 +1796,22 @@ handle_inbound_channel (void *cls,
   struct PeerContext *peer_ctx;
   struct GNUNET_PeerIdentity *ctx_peer;
   struct ChannelCtx *channel_ctx;
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
       "New channel was established to us (Peer %s).\n",
       GNUNET_i2s (initiator));
   GNUNET_assert (NULL != channel); /* according to cadet API */
   /* Make sure we 'know' about this peer */
-  peer_ctx = create_or_get_peer_ctx (ss, initiator);
+  peer_ctx = create_or_get_peer_ctx (sub, initiator);
   set_peer_online (peer_ctx);
-  (void) add_valid_peer (&peer_ctx->peer_id, peer_ctx->ss->valid_peers);
+  (void) add_valid_peer (&peer_ctx->peer_id, peer_ctx->sub->valid_peers);
   ctx_peer = GNUNET_new (struct GNUNET_PeerIdentity);
   *ctx_peer = *initiator;
   channel_ctx = add_channel_ctx (peer_ctx);
   channel_ctx->channel = channel;
   /* We only accept one incoming channel per peer */
-  if (GNUNET_YES == check_peer_send_intention (get_peer_ctx (ss->peer_map,
+  if (GNUNET_YES == check_peer_send_intention (get_peer_ctx (sub->peer_map,
                                                              initiator)))
   {
     LOG (GNUNET_ERROR_TYPE_WARNING,
@@ -1835,7 +1838,7 @@ handle_inbound_channel (void *cls,
 static int
 check_sending_channel_exists (const struct PeerContext *peer_ctx)
 {
-  if (GNUNET_NO == check_peer_known (peer_ctx->ss->peer_map,
+  if (GNUNET_NO == check_peer_known (peer_ctx->sub->peer_map,
                                      &peer_ctx->peer_id))
   { /* If no such peer exists, there is no channel */
     return GNUNET_NO;
@@ -1859,7 +1862,7 @@ check_sending_channel_exists (const struct PeerContext 
*peer_ctx)
 static int
 destroy_sending_channel (struct PeerContext *peer_ctx)
 {
-  if (GNUNET_NO == check_peer_known (peer_ctx->ss->peer_map,
+  if (GNUNET_NO == check_peer_known (peer_ctx->sub->peer_map,
                                      &peer_ctx->peer_id))
   {
     return GNUNET_NO;
@@ -1922,7 +1925,7 @@ schedule_operation (struct PeerContext *peer_ctx,
 {
   struct PeerPendingOp pending_op;
 
-  GNUNET_assert (GNUNET_YES == check_peer_known (peer_ctx->ss->peer_map,
+  GNUNET_assert (GNUNET_YES == check_peer_known (peer_ctx->sub->peer_map,
                                                  &peer_ctx->peer_id));
 
   //TODO if ONLINE execute immediately
@@ -2010,9 +2013,9 @@ struct ClientContext
   struct GNUNET_SERVICE_Client *client;
 
   /**
-   * The #SubSampler this context belongs to
+   * The #Sub this context belongs to
    */
-  struct SubSampler *ss;
+  struct Sub *sub;
 };
 
 /**
@@ -2109,35 +2112,35 @@ insert_in_view_op (void *cls,
  *
  * Called once we know a peer is online.
  *
- * @param ss SubSampler in with the view to insert in
+ * @param sub Sub in with the view to insert in
  * @param peer the peer to insert
  *
  * @return GNUNET_OK if peer was actually inserted
  *         GNUNET_NO if peer was not inserted
  */
 static int
-insert_in_view (struct SubSampler *ss,
+insert_in_view (struct Sub *sub,
                 const struct GNUNET_PeerIdentity *peer)
 {
   struct PeerContext *peer_ctx;
   int online;
   int ret;
 
-  online = check_peer_flag (ss->peer_map, peer, Peers_ONLINE);
-  peer_ctx = get_peer_ctx (ss->peer_map, peer); // TODO indirection needed?
+  online = check_peer_flag (sub->peer_map, peer, Peers_ONLINE);
+  peer_ctx = get_peer_ctx (sub->peer_map, peer); // TODO indirection needed?
   if ( (GNUNET_NO == online) ||
        (GNUNET_SYSERR == online) ) /* peer is not even known */
   {
-    (void) issue_peer_online_check (ss, peer);
+    (void) issue_peer_online_check (sub, peer);
     (void) schedule_operation (peer_ctx, insert_in_view_op, NULL);
     return GNUNET_NO;
   }
   /* Open channel towards peer to keep connection open */
   indicate_sending_intention (peer_ctx);
-  ret = View_put (ss->view, peer);
+  ret = View_put (sub->view, peer);
   GNUNET_STATISTICS_set (stats,
                          "view size",
-                         View_size (peer_ctx->ss->view),
+                         View_size (peer_ctx->sub->view),
                          GNUNET_NO);
   return ret;
 }
@@ -2160,8 +2163,8 @@ send_view (const struct ClientContext *cli_ctx,
 
   if (NULL == view_array)
   {
-    view_size = View_size (cli_ctx->ss->view);
-    view_array = View_get_as_array (cli_ctx->ss->view);
+    view_size = View_size (cli_ctx->sub->view);
+    view_array = View_get_as_array (cli_ctx->sub->view);
   }
 
   ev = GNUNET_MQ_msg_extra (out_msg,
@@ -2210,17 +2213,17 @@ send_stream_peers (const struct ClientContext *cli_ctx,
 /**
  * @brief sends updates to clients that are interested
  *
- * @param ss Subsampler for which to notify clients
+ * @param sub Sub for which to notify clients
  */
 static void
-clients_notify_view_update (const struct SubSampler *ss)
+clients_notify_view_update (const struct Sub *sub)
 {
   struct ClientContext *cli_ctx_iter;
   uint64_t num_peers;
   const struct GNUNET_PeerIdentity *view_array;
 
-  num_peers = View_size (ss->view);
-  view_array = View_get_as_array(ss->view);
+  num_peers = View_size (sub->view);
+  view_array = View_get_as_array(sub->view);
   /* check size of view is small enough */
   if (GNUNET_MAX_MESSAGE_SIZE < num_peers)
   {
@@ -2260,7 +2263,8 @@ clients_notify_view_update (const struct SubSampler *ss)
  * @param peers the array of peers to send
  */
 static void
-clients_notify_stream_peer (uint64_t num_peers,
+clients_notify_stream_peer (const struct Sub *sub,
+                            uint64_t num_peers,
                             const struct GNUNET_PeerIdentity *peers)
                             // TODO enum StreamPeerSource)
 {
@@ -2274,7 +2278,8 @@ clients_notify_stream_peer (uint64_t num_peers,
        NULL != cli_ctx_iter;
        cli_ctx_iter = cli_ctx_iter->next)
   {
-    if (GNUNET_YES == cli_ctx_iter->stream_update)
+    if (GNUNET_YES == cli_ctx_iter->stream_update &&
+        (sub == cli_ctx_iter->sub || sub == msub))
     {
       send_stream_peers (cli_ctx_iter, num_peers, peers);
     }
@@ -2287,7 +2292,7 @@ clients_notify_stream_peer (uint64_t num_peers,
  *
  * @param ids Array of Peers to insert into view
  * @param num_peers Number of peers to insert
- * @param cls Closure - The SubSampler for which this is to be done
+ * @param cls Closure - The Sub for which this is to be done
  */
 static void
 hist_update (const struct GNUNET_PeerIdentity *ids,
@@ -2295,21 +2300,21 @@ hist_update (const struct GNUNET_PeerIdentity *ids,
              void *cls)
 {
   unsigned int i;
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
   for (i = 0; i < num_peers; i++)
   {
     int inserted;
-    inserted = insert_in_view (ss, &ids[i]);
+    inserted = insert_in_view (sub, &ids[i]);
     if (GNUNET_OK == inserted)
     {
-      clients_notify_stream_peer (1, &ids[i]);
+      clients_notify_stream_peer (sub, 1, &ids[i]);
     }
-    to_file (ss->file_name_view_log,
+    to_file (sub->file_name_view_log,
              "+%s\t(hist)",
              GNUNET_i2s_full (ids));
   }
-  clients_notify_view_update (ss);
+  clients_notify_view_update (sub);
 }
 
 
@@ -2433,16 +2438,16 @@ send_pull_reply (struct PeerContext *peer_ctx,
  *
  * Called once we know a peer is online.
  *
- * @param cls Closure - SubSampler with the pull map to insert into
+ * @param cls Closure - Sub with the pull map to insert into
  * @param peer Peer to insert
  */
 static void
 insert_in_pull_map (void *cls,
                     const struct GNUNET_PeerIdentity *peer)
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
-  CustomPeerMap_put (ss->pull_map, peer);
+  CustomPeerMap_put (sub->pull_map, peer);
 }
 
 
@@ -2452,20 +2457,20 @@ insert_in_pull_map (void *cls,
  * Called once we know a peer is online.
  * Implements #PeerOp
  *
- * @param cls Closure - SubSampler with view to insert peer into
+ * @param cls Closure - Sub with view to insert peer into
  * @param peer the peer to insert
  */
 static void
 insert_in_view_op (void *cls,
                    const struct GNUNET_PeerIdentity *peer)
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
   int inserted;
 
-  inserted = insert_in_view (ss, peer);
+  inserted = insert_in_view (sub, peer);
   if (GNUNET_OK == inserted)
   {
-    clients_notify_stream_peer (1, peer);
+    clients_notify_stream_peer (sub, 1, peer);
   }
 }
 
@@ -2474,41 +2479,41 @@ insert_in_view_op (void *cls,
  * Update sampler with given PeerID.
  * Implements #PeerOp
  *
- * @param cls Closure - SubSampler containing the sampler to insert into
+ * @param cls Closure - Sub containing the sampler to insert into
  * @param peer Peer to insert
  */
 static void
 insert_in_sampler (void *cls,
                    const struct GNUNET_PeerIdentity *peer)
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Updating samplers with peer %s from insert_in_sampler()\n",
        GNUNET_i2s (peer));
-  RPS_sampler_update (ss->sampler, peer);
-  if (0 < RPS_sampler_count_id (ss->sampler, peer))
+  RPS_sampler_update (sub->sampler, peer);
+  if (0 < RPS_sampler_count_id (sub->sampler, peer))
   {
     /* Make sure we 'know' about this peer */
-    (void) issue_peer_online_check (ss, peer);
+    (void) issue_peer_online_check (sub, peer);
     /* Establish a channel towards that peer to indicate we are going to send
      * messages to it */
     //indicate_sending_intention (peer);
   }
   #ifdef TO_FILE
-  ss->num_observed_peers++;
+  sub->num_observed_peers++;
   GNUNET_CONTAINER_multipeermap_put
-    (ss->observed_unique_peers,
+    (sub->observed_unique_peers,
      peer,
      NULL,
      GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
   uint32_t num_observed_unique_peers =
-    GNUNET_CONTAINER_multipeermap_size (ss->observed_unique_peers);
-  to_file (ss->file_name_observed_log,
+    GNUNET_CONTAINER_multipeermap_size (sub->observed_unique_peers);
+  to_file (sub->file_name_observed_log,
           "%" PRIu32 " %" PRIu32 " %f\n",
-          ss->num_observed_peers,
+          sub->num_observed_peers,
           num_observed_unique_peers,
-          1.0*num_observed_unique_peers/ss->num_observed_peers)
+          1.0*num_observed_unique_peers/sub->num_observed_peers)
   #endif /* TO_FILE */
 }
 
@@ -2520,20 +2525,20 @@ insert_in_sampler (void *cls,
  *
  * "External sources" refer to every source except the gossip.
  *
- * @param ss SubSampler for which @a peer was received
+ * @param sub Sub for which @a peer was received
  * @param peer peer to insert/peer received
  */
 static void
-got_peer (struct SubSampler *ss,
+got_peer (struct Sub *sub,
           const struct GNUNET_PeerIdentity *peer)
 {
   /* If we did not know this peer already, insert it into sampler and view */
-  if (GNUNET_YES == issue_peer_online_check (ss, peer))
+  if (GNUNET_YES == issue_peer_online_check (sub, peer))
   {
-    schedule_operation (get_peer_ctx (ss->peer_map, peer),
-                        &insert_in_sampler, ss);
-    schedule_operation (get_peer_ctx (ss->peer_map, peer),
-                        &insert_in_view_op, ss);
+    schedule_operation (get_peer_ctx (sub->peer_map, peer),
+                        &insert_in_sampler, sub);
+    schedule_operation (get_peer_ctx (sub->peer_map, peer),
+                        &insert_in_view_op, sub);
   }
   GNUNET_STATISTICS_update (stats,
                             "# learnd peers",
@@ -2553,22 +2558,22 @@ static int
 check_sending_channel_needed (const struct PeerContext *peer_ctx)
 {
   /* struct GNUNET_CADET_Channel *channel; */
-  if (GNUNET_NO == check_peer_known (peer_ctx->ss->peer_map,
+  if (GNUNET_NO == check_peer_known (peer_ctx->sub->peer_map,
                                      &peer_ctx->peer_id))
   {
     return GNUNET_NO;
   }
   if (GNUNET_YES == check_sending_channel_exists (peer_ctx))
   {
-    if ( (0 < RPS_sampler_count_id (peer_ctx->ss->sampler,
+    if ( (0 < RPS_sampler_count_id (peer_ctx->sub->sampler,
                                     &peer_ctx->peer_id)) ||
-         (GNUNET_YES == View_contains_peer (peer_ctx->ss->view,
+         (GNUNET_YES == View_contains_peer (peer_ctx->sub->view,
                                             &peer_ctx->peer_id)) ||
-         (GNUNET_YES == CustomPeerMap_contains_peer (peer_ctx->ss->push_map,
+         (GNUNET_YES == CustomPeerMap_contains_peer (peer_ctx->sub->push_map,
                                                      &peer_ctx->peer_id)) ||
-         (GNUNET_YES == CustomPeerMap_contains_peer (peer_ctx->ss->pull_map,
+         (GNUNET_YES == CustomPeerMap_contains_peer (peer_ctx->sub->pull_map,
                                                      &peer_ctx->peer_id)) ||
-         (GNUNET_YES == check_peer_flag (peer_ctx->ss->peer_map,
+         (GNUNET_YES == check_peer_flag (peer_ctx->sub->peer_map,
                                          &peer_ctx->peer_id,
                                          Peers_PULL_REPLY_PENDING)))
     { /* If we want to keep the connection to peer open */
@@ -2584,18 +2589,18 @@ check_sending_channel_needed (const struct PeerContext 
*peer_ctx)
  * @brief remove peer from our knowledge, the view, push and pull maps and
  * samplers.
  *
- * @param ss SubSampler with the data structures the peer is to be removed from
+ * @param sub Sub with the data structures the peer is to be removed from
  * @param peer the peer to remove
  */
 static void
-remove_peer (struct SubSampler *ss,
+remove_peer (struct Sub *sub,
              const struct GNUNET_PeerIdentity *peer)
 {
-  (void) View_remove_peer (ss->view, peer);
-  CustomPeerMap_remove_peer (ss->pull_map, peer);
-  CustomPeerMap_remove_peer (ss->push_map, peer);
-  RPS_sampler_reinitialise_by_value (ss->sampler, peer);
-  destroy_peer (get_peer_ctx (ss->peer_map, peer));
+  (void) View_remove_peer (sub->view, peer);
+  CustomPeerMap_remove_peer (sub->pull_map, peer);
+  CustomPeerMap_remove_peer (sub->push_map, peer);
+  RPS_sampler_reinitialise_by_value (sub->sampler, peer);
+  destroy_peer (get_peer_ctx (sub->peer_map, peer));
 }
 
 
@@ -2604,14 +2609,14 @@ remove_peer (struct SubSampler *ss,
  *
  * If the sending channel is no longer needed it is destroyed.
  *
- * @param ss SubSamper in which the current peer is to be cleaned
+ * @param sub Sub in which the current peer is to be cleaned
  * @param peer the peer whose data is about to be cleaned
  */
 static void
-clean_peer (struct SubSampler *ss,
+clean_peer (struct Sub *sub,
             const struct GNUNET_PeerIdentity *peer)
 {
-  if (GNUNET_NO == check_sending_channel_needed (get_peer_ctx (ss->peer_map,
+  if (GNUNET_NO == check_sending_channel_needed (get_peer_ctx (sub->peer_map,
                                                                peer)))
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
@@ -2619,24 +2624,24 @@ clean_peer (struct SubSampler *ss,
         GNUNET_i2s (peer));
     #ifdef ENABLE_MALICIOUS
     if (0 != GNUNET_CRYPTO_cmp_peer_identity (&attacked_peer, peer))
-      (void) destroy_sending_channel (get_peer_ctx (ss->peer_map, peer));
+      (void) destroy_sending_channel (get_peer_ctx (sub->peer_map, peer));
     #else /* ENABLE_MALICIOUS */
-    (void) destroy_sending_channel (get_peer_ctx (ss->peer_map, peer));
+    (void) destroy_sending_channel (get_peer_ctx (sub->peer_map, peer));
     #endif /* ENABLE_MALICIOUS */
   }
 
-  if ( (GNUNET_NO == check_peer_send_intention (get_peer_ctx (ss->peer_map,
+  if ( (GNUNET_NO == check_peer_send_intention (get_peer_ctx (sub->peer_map,
                                                               peer))) &&
-       (GNUNET_NO == View_contains_peer (ss->view, peer)) &&
-       (GNUNET_NO == CustomPeerMap_contains_peer (ss->push_map, peer)) &&
-       (GNUNET_NO == CustomPeerMap_contains_peer (ss->push_map, peer)) &&
-       (0 == RPS_sampler_count_id (ss->sampler,   peer)) &&
-       (GNUNET_NO != check_removable (get_peer_ctx (ss->peer_map, peer))) )
+       (GNUNET_NO == View_contains_peer (sub->view, peer)) &&
+       (GNUNET_NO == CustomPeerMap_contains_peer (sub->push_map, peer)) &&
+       (GNUNET_NO == CustomPeerMap_contains_peer (sub->push_map, peer)) &&
+       (0 == RPS_sampler_count_id (sub->sampler,   peer)) &&
+       (GNUNET_NO != check_removable (get_peer_ctx (sub->peer_map, peer))) )
   { /* We can safely remove this peer */
     LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Going to remove peer %s\n",
         GNUNET_i2s (peer));
-    remove_peer (ss, peer);
+    remove_peer (sub, peer);
     return;
   }
 }
@@ -2666,7 +2671,7 @@ cleanup_destroyed_channel (void *cls,
   if (NULL != peer_ctx &&
       peer_ctx->send_channel_ctx == channel_ctx)
   {
-    remove_peer (peer_ctx->ss, &peer_ctx->peer_id);
+    remove_peer (peer_ctx->sub, &peer_ctx->peer_id);
   }
 }
 
@@ -2677,35 +2682,30 @@ cleanup_destroyed_channel (void *cls,
 
 
 /***********************************************************************
- * SubSampler
+ * Sub
 ***********************************************************************/
 
 /**
- * @brief Create a new SUbSampler
+ * @brief Create a new Sub
  *
- * @param shared_value Value shared among rps instances on other hosts that
- * defines a subgroup to sample from.
+ * @param hash Hash of value shared among rps instances on other hosts that
+ *        defines a subgroup to sample from.
  * @param sampler_size Size of the sampler
  * @param round_interval Interval (in average) between two rounds
  *
- * @return SubSampler
+ * @return Sub
  */
-struct SubSampler *
-new_subsampler (const char *shared_value,
-                uint32_t sampler_size,
-                struct GNUNET_TIME_Relative round_interval)
+struct Sub *
+new_sub (const struct GNUNET_HashCode *hash,
+         uint32_t sampler_size,
+         struct GNUNET_TIME_Relative round_interval)
 {
-  struct SubSampler *ss;
-  char hash_port_string[512] = GNUNET_APPLICATION_PORT_RPS;
+  struct Sub *sub;
 
-  ss = GNUNET_new (struct SubSampler);
+  sub = GNUNET_new (struct Sub);
 
   /* With the hash generated from the secret value this service only connects
    * to rps instances that share the value */
-  strcat (hash_port_string, shared_value);
-  GNUNET_CRYPTO_hash (hash_port_string,
-                      strlen (hash_port_string),
-                      &ss->port);
   struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
     GNUNET_MQ_hd_fixed_size (peer_check,
                              GNUNET_MESSAGE_TYPE_RPS_PP_CHECK_LIVE,
@@ -2725,17 +2725,16 @@ new_subsampler (const char *shared_value,
                            NULL),
     GNUNET_MQ_handler_end ()
   };
-  ss->cadet_handle = GNUNET_CADET_connect (cfg);
-  GNUNET_assert (NULL != ss->cadet_handle);
-  ss->cadet_port =
-    GNUNET_CADET_open_port (ss->cadet_handle,
-                            &ss->port,
+  sub->hash = *hash;
+  sub->cadet_port =
+    GNUNET_CADET_open_port (cadet_handle,
+                            &sub->hash,
                             &handle_inbound_channel, /* Connect handler */
-                            ss, /* cls */
+                            sub, /* cls */
                             NULL, /* WindowSize handler */
                             &cleanup_destroyed_channel, /* Disconnect handler 
*/
                             cadet_handlers);
-  if (NULL == ss->cadet_port)
+  if (NULL == sub->cadet_port)
   {
     LOG (GNUNET_ERROR_TYPE_ERROR,
         "Cadet port `%s' is already in use.\n",
@@ -2744,53 +2743,98 @@ new_subsampler (const char *shared_value,
   }
 
   /* Set up general data structure to keep track about peers */
-  ss->valid_peers = GNUNET_CONTAINER_multipeermap_create (4, GNUNET_NO);
+  sub->valid_peers = GNUNET_CONTAINER_multipeermap_create (4, GNUNET_NO);
   if (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_filename (cfg,
                                                "rps",
                                                "FILENAME_VALID_PEERS",
-                                               &ss->filename_valid_peers))
+                                               &sub->filename_valid_peers))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                                "rps",
                                "FILENAME_VALID_PEERS");
   }
-  ss->peer_map = GNUNET_CONTAINER_multipeermap_create (4, GNUNET_NO);
+  sub->peer_map = GNUNET_CONTAINER_multipeermap_create (4, GNUNET_NO);
 
   /* Set up the sampler */
-  ss->sampler_size_est_min = sampler_size;
-  ss->sampler_size_est_need = sampler_size;;
-  LOG (GNUNET_ERROR_TYPE_DEBUG, "MINSIZE is %u\n", ss->sampler_size_est_min);
-  ss->round_interval = round_interval;
-  ss->sampler = RPS_sampler_init (sampler_size,
+  sub->sampler_size_est_min = sampler_size;
+  sub->sampler_size_est_need = sampler_size;;
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "MINSIZE is %u\n", sub->sampler_size_est_min);
+  GNUNET_assert (0 != round_interval.rel_value_us);
+  sub->round_interval = round_interval;
+  sub->sampler = RPS_sampler_init (sampler_size,
                                   round_interval);
 
   /* Logging of internals */
-  ss->file_name_view_log = store_prefix_file_name (&own_identity, "view");
+  sub->file_name_view_log = store_prefix_file_name (&own_identity, "view");
   #ifdef TO_FILE
-  ss->file_name_observed_log = store_prefix_file_name (&own_identity,
+  sub->file_name_observed_log = store_prefix_file_name (&own_identity,
                                                        "observed");
-  ss->num_observed_peers = 0;
-  ss->observed_unique_peers = GNUNET_CONTAINER_multipeermap_create (1,
+  sub->num_observed_peers = 0;
+  sub->observed_unique_peers = GNUNET_CONTAINER_multipeermap_create (1,
                                                                     GNUNET_NO);
   #endif /* TO_FILE */
 
   /* Set up data structures for gossip */
-  ss->push_map = CustomPeerMap_create (4);
-  ss->pull_map = CustomPeerMap_create (4);
-  ss->view_size_est_min = sampler_size;;
-  ss->view = View_create (ss->view_size_est_min);
+  sub->push_map = CustomPeerMap_create (4);
+  sub->pull_map = CustomPeerMap_create (4);
+  sub->view_size_est_min = sampler_size;;
+  sub->view = View_create (sub->view_size_est_min);
   GNUNET_STATISTICS_set (stats,
                          "view size aim",
-                         ss->view_size_est_min,
+                         sub->view_size_est_min,
                          GNUNET_NO);
 
+  /* Start executing rounds */
+  sub->do_round_task = GNUNET_SCHEDULER_add_now (&do_round, sub);
 
-  return ss;
+  return sub;
 }
 
+
+/**
+ * @brief Destroy Sub.
+ *
+ * @param sub Sub to destroy
+ */
+static void
+destroy_sub (struct Sub *sub)
+{
+  GNUNET_assert (NULL != sub);
+  GNUNET_assert (NULL != sub->do_round_task);
+  GNUNET_SCHEDULER_cancel (sub->do_round_task);
+  sub->do_round_task = NULL;
+
+  /* Disconnect from cadet */
+  GNUNET_CADET_close_port (sub->cadet_port);
+
+  /* Clean up data structures for peers */
+  RPS_sampler_destroy (sub->sampler);
+  sub->sampler = NULL;
+  View_destroy (sub->view);
+  sub->view = NULL;
+  CustomPeerMap_destroy (sub->push_map);
+  sub->push_map = NULL;
+  CustomPeerMap_destroy (sub->pull_map);
+  sub->pull_map = NULL;
+  peers_terminate (sub);
+
+  /* Free leftover data structures */
+  GNUNET_free (sub->file_name_view_log);
+  sub->file_name_view_log = NULL;
+#ifdef TO_FILE
+  GNUNET_free (sub->file_name_observed_log);
+  sub->file_name_observed_log = NULL;
+  GNUNET_CONTAINER_multipeermap_destroy (sub->observed_unique_peers);
+  sub->observed_unique_peers = NULL;
+#endif /* TO_FILE */
+
+  GNUNET_free (sub);
+}
+
+
 /***********************************************************************
- * /SubSampler
+ * /Sub
 ***********************************************************************/
 
 
@@ -2806,58 +2850,88 @@ destroy_cli_ctx (struct ClientContext *cli_ctx)
   GNUNET_CONTAINER_DLL_remove (cli_ctx_head,
                                cli_ctx_tail,
                                cli_ctx);
+  if (NULL != cli_ctx->sub)
+  {
+    destroy_sub (cli_ctx->sub);
+    cli_ctx->sub = NULL;
+  }
   GNUNET_free (cli_ctx);
 }
 
 
 /**
- * Function called by NSE.
+ * @brief Update sizes in sampler and view on estimate update from nse service
  *
- * Updates sizes of sampler list and view and adapt those lists
- * accordingly.
- *
- * implements #GNUNET_NSE_Callback
- *
- * @param cls Closure - SubSampler
- * @param timestamp time when the estimate was received from the server (or 
created by the server)
+ * @param sub Sub
  * @param logestimate the log(Base 2) value of the current network size 
estimate
  * @param std_dev standard deviation for the estimate
  */
 static void
-nse_callback (void *cls,
-              struct GNUNET_TIME_Absolute timestamp,
-              double logestimate, double std_dev)
+adapt_sizes (struct Sub *sub, double logestimate, double std_dev)
 {
   double estimate;
   //double scale; // TODO this might go gloabal/config
-  struct SubSampler *ss = cls;
-  (void) timestamp;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Received a ns estimate - logest: %f, std_dev: %f (old_size: %u)\n",
-       logestimate, std_dev, RPS_sampler_get_size (ss->sampler));
+       logestimate, std_dev, RPS_sampler_get_size (sub->sampler));
   //scale = .01;
   estimate = GNUNET_NSE_log_estimate_to_n (logestimate);
   // GNUNET_NSE_log_estimate_to_n (logestimate);
   estimate = pow (estimate, 1.0 / 3);
   // TODO add if std_dev is a number
   // estimate += (std_dev * scale);
-  if (ss->view_size_est_min < ceil (estimate))
+  if (sub->view_size_est_min < ceil (estimate))
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG, "Changing estimate to %f\n", estimate);
-    ss->sampler_size_est_need = estimate;
-    ss->view_size_est_need = estimate;
+    sub->sampler_size_est_need = estimate;
+    sub->view_size_est_need = estimate;
   } else
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG, "Not using estimate %f\n", estimate);
-    //ss->sampler_size_est_need = ss->view_size_est_min;
-    ss->view_size_est_need = ss->view_size_est_min;
+    //sub->sampler_size_est_need = sub->view_size_est_min;
+    sub->view_size_est_need = sub->view_size_est_min;
   }
-  GNUNET_STATISTICS_set (stats, "view size aim", ss->view_size_est_need, 
GNUNET_NO);
+  GNUNET_STATISTICS_set (stats, "view size aim", sub->view_size_est_need, 
GNUNET_NO);
 
   /* If the NSE has changed adapt the lists accordingly */
-  resize_wrapper (ss->sampler, ss->sampler_size_est_need);
-  View_change_len (ss->view, ss->view_size_est_need);
+  resize_wrapper (sub->sampler, sub->sampler_size_est_need);
+  View_change_len (sub->view, sub->view_size_est_need);
+}
+
+
+/**
+ * Function called by NSE.
+ *
+ * Updates sizes of sampler list and view and adapt those lists
+ * accordingly.
+ *
+ * implements #GNUNET_NSE_Callback
+ *
+ * @param cls Closure - unused
+ * @param timestamp time when the estimate was received from the server (or 
created by the server)
+ * @param logestimate the log(Base 2) value of the current network size 
estimate
+ * @param std_dev standard deviation for the estimate
+ */
+static void
+nse_callback (void *cls,
+              struct GNUNET_TIME_Absolute timestamp,
+              double logestimate, double std_dev)
+{
+  (void) cls;
+  (void) timestamp;
+  struct ClientContext *cli_ctx_iter;
+
+  adapt_sizes (msub, logestimate, std_dev);
+  for (cli_ctx_iter = cli_ctx_head;
+      NULL != cli_ctx_iter;
+      cli_ctx_iter = cli_ctx_iter->next)
+  {
+    if (NULL != cli_ctx_iter->sub)
+    {
+      adapt_sizes (cli_ctx_iter->sub, logestimate, std_dev);
+    }
+  }
 }
 
 
@@ -2881,6 +2955,10 @@ check_client_seed (void *cls, const struct 
GNUNET_RPS_CS_SeedMessage *msg)
   if ( (msize / sizeof (struct GNUNET_PeerIdentity) != num_peers) ||
        (msize % sizeof (struct GNUNET_PeerIdentity) != 0) )
   {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+        "message says it sends %" PRIu32 " peers, have space for %lu peers\n",
+        ntohl (msg->num_peers),
+        (msize / sizeof (struct GNUNET_PeerIdentity)));
     GNUNET_break (0);
     GNUNET_SERVICE_client_drop (cli_ctx->client);
     return GNUNET_SYSERR;
@@ -2918,7 +2996,8 @@ handle_client_seed (void *cls,
          i,
          GNUNET_i2s (&peers[i]));
 
-    got_peer (cli_ctx->ss, &peers[i]);
+    if (NULL != msub) got_peer (msub, &peers[i]);
+    if (NULL != cli_ctx->sub) got_peer (cli_ctx->sub, &peers[i]);
   }
   GNUNET_SERVICE_client_continue (cli_ctx->client);
 }
@@ -3013,15 +3092,63 @@ handle_client_stream_cancel (void *cls,
   (void) msg;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
-       "Client requested peers from biased stream.\n");
+       "Client canceled receiving peers from biased stream.\n");
   cli_ctx->stream_update = GNUNET_NO;
 
   GNUNET_assert (NULL != cli_ctx);
   GNUNET_SERVICE_client_continue (cli_ctx->client);
-  if (0 == cli_ctx->view_updates_left)
+}
+
+
+/**
+ * @brief Create and start a Sub.
+ *
+ * @param cls Closure - unused
+ * @param msg Message containing the necessary information
+ */
+static void
+handle_client_start_sub (void *cls,
+                         const struct GNUNET_RPS_CS_SubStartMessage *msg)
+{
+  struct ClientContext *cli_ctx = cls;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG, "Client requested start of a new sub.\n");
+  if (NULL != cli_ctx->sub &&
+      0 != memcmp (&cli_ctx->sub->hash,
+                   &msg->hash,
+                   sizeof (struct GNUNET_HashCode)))
   {
-    destroy_cli_ctx (cli_ctx);
+    LOG (GNUNET_ERROR_TYPE_WARNING, "Already have a Sub with different share 
for this client. Remove old one, add new.\n");
+    destroy_sub (cli_ctx->sub);
+    cli_ctx->sub = NULL;
   }
+  cli_ctx->sub = new_sub (&msg->hash,
+                         msub->sampler_size_est_min, // TODO make api input?
+                         GNUNET_TIME_relative_ntoh (msg->round_interval));
+  GNUNET_SERVICE_client_continue (cli_ctx->client);
+}
+
+
+/**
+ * @brief Destroy the Sub
+ *
+ * @param cls Closure - unused
+ * @param msg Message containing the hash that identifies the Sub
+ */
+static void
+handle_client_stop_sub (void *cls,
+                        const struct GNUNET_RPS_CS_SubStopMessage *msg)
+{
+  struct ClientContext *cli_ctx = cls;
+
+  GNUNET_assert (NULL != cli_ctx->sub);
+  if (0 != memcmp (&cli_ctx->sub->hash, &msg->hash, sizeof (struct 
GNUNET_HashCode)))
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING, "Share of current sub and request 
differ!\n");
+  }
+  destroy_sub (cli_ctx->sub);
+  cli_ctx->sub = NULL;
+  GNUNET_SERVICE_client_continue (cli_ctx->client);
 }
 
 
@@ -3109,9 +3236,9 @@ handle_peer_push (void *cls,
   #endif /* ENABLE_MALICIOUS */
 
   /* Add the sending peer to the push_map */
-  CustomPeerMap_put (channel_ctx->peer_ctx->ss->push_map, peer);
+  CustomPeerMap_put (channel_ctx->peer_ctx->sub->push_map, peer);
 
-  GNUNET_break_op (check_peer_known (channel_ctx->peer_ctx->ss->peer_map,
+  GNUNET_break_op (check_peer_known (channel_ctx->peer_ctx->sub->peer_map,
                                      &channel_ctx->peer_ctx->peer_id));
   GNUNET_CADET_receive_done (channel_ctx->channel);
 }
@@ -3154,13 +3281,13 @@ handle_peer_pull_request (void *cls,
   }
   #endif /* ENABLE_MALICIOUS */
 
-  GNUNET_break_op (check_peer_known (channel_ctx->peer_ctx->ss->peer_map,
+  GNUNET_break_op (check_peer_known (channel_ctx->peer_ctx->sub->peer_map,
                                      &channel_ctx->peer_ctx->peer_id));
   GNUNET_CADET_receive_done (channel_ctx->channel);
-  view_array = View_get_as_array (channel_ctx->peer_ctx->ss->view);
+  view_array = View_get_as_array (channel_ctx->peer_ctx->sub->view);
   send_pull_reply (peer_ctx,
                    view_array,
-                   View_size (channel_ctx->peer_ctx->ss->view));
+                   View_size (channel_ctx->peer_ctx->sub->view));
 }
 
 
@@ -3196,7 +3323,7 @@ check_peer_pull_reply (void *cls,
     return GNUNET_SYSERR;
   }
 
-  if (GNUNET_YES != check_peer_flag (sender_ctx->ss->peer_map,
+  if (GNUNET_YES != check_peer_flag (sender_ctx->sub->peer_map,
                                      &sender_ctx->peer_id,
                                      Peers_PULL_REPLY_PENDING))
   {
@@ -3277,27 +3404,27 @@ handle_peer_pull_reply (void *cls,
     }
     #endif /* ENABLE_MALICIOUS */
     /* Make sure we 'know' about this peer */
-    (void) insert_peer (channel_ctx->peer_ctx->ss, &peers[i]);
+    (void) insert_peer (channel_ctx->peer_ctx->sub, &peers[i]);
 
-    if (GNUNET_YES == check_peer_valid (channel_ctx->peer_ctx->ss->valid_peers,
+    if (GNUNET_YES == check_peer_valid 
(channel_ctx->peer_ctx->sub->valid_peers,
                                         &peers[i]))
     {
-      CustomPeerMap_put (channel_ctx->peer_ctx->ss->pull_map, &peers[i]);
+      CustomPeerMap_put (channel_ctx->peer_ctx->sub->pull_map, &peers[i]);
     }
     else
     {
       schedule_operation (channel_ctx->peer_ctx,
                           insert_in_pull_map,
-                          channel_ctx->peer_ctx->ss); /* cls */
-      (void) issue_peer_online_check (channel_ctx->peer_ctx->ss, &peers[i]);
+                          channel_ctx->peer_ctx->sub); /* cls */
+      (void) issue_peer_online_check (channel_ctx->peer_ctx->sub, &peers[i]);
     }
   }
 
-  UNSET_PEER_FLAG (get_peer_ctx (channel_ctx->peer_ctx->ss->peer_map, sender),
+  UNSET_PEER_FLAG (get_peer_ctx (channel_ctx->peer_ctx->sub->peer_map, sender),
                    Peers_PULL_REPLY_PENDING);
-  clean_peer (channel_ctx->peer_ctx->ss, sender);
+  clean_peer (channel_ctx->peer_ctx->sub, sender);
 
-  GNUNET_break_op (check_peer_known (channel_ctx->peer_ctx->ss->peer_map,
+  GNUNET_break_op (check_peer_known (channel_ctx->peer_ctx->sub->peer_map,
                                      sender));
   GNUNET_CADET_receive_done (channel_ctx->channel);
 }
@@ -3362,7 +3489,7 @@ send_pull_request (struct PeerContext *peer_ctx)
 {
   struct GNUNET_MQ_Envelope *ev;
 
-  GNUNET_assert (GNUNET_NO == check_peer_flag (peer_ctx->ss->peer_map,
+  GNUNET_assert (GNUNET_NO == check_peer_flag (peer_ctx->sub->peer_map,
                                                &peer_ctx->peer_id,
                                                Peers_PULL_REPLY_PENDING));
   SET_PEER_FLAG (peer_ctx, Peers_PULL_REPLY_PENDING);
@@ -3397,12 +3524,6 @@ send_push (struct PeerContext *peer_ctx)
 }
 
 
-static void
-do_round (void *cls);
-
-static void
-do_mal_round (void *cls);
-
 #ifdef ENABLE_MALICIOUS
 
 
@@ -3452,7 +3573,7 @@ handle_client_act_malicious (void *cls,
   struct GNUNET_PeerIdentity *peers;
   uint32_t num_mal_peers_sent;
   uint32_t num_mal_peers_old;
-  struct SubSampler *ss = cli_ctx->ss;
+  struct Sub *sub = cli_ctx->sub;
 
   /* Do actual logic */
   peers = (struct GNUNET_PeerIdentity *) &msg[1];
@@ -3484,8 +3605,15 @@ handle_client_act_malicious (void *cls,
                            mal_peer_set);
 
     /* Substitute do_round () with do_mal_round () */
-    GNUNET_SCHEDULER_cancel (ss->do_round_task);
-    ss->do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, ss);
+    if (NULL != sub)
+    {
+      GNUNET_SCHEDULER_cancel (sub->do_round_task);
+      sub->do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, sub);
+    }
+    else
+    {
+      LOG (GNUNET_ERROR_TYPE_WARNING, "do_round_task is NULL, probably in 
shutdown\n");
+    }
   }
 
   else if ( (2 == mal_type) ||
@@ -3517,9 +3645,10 @@ handle_client_act_malicious (void *cls,
             &msg->attacked_peer,
             sizeof (struct GNUNET_PeerIdentity));
     /* Set the flag of the attacked peer to valid to avoid problems */
-    if (GNUNET_NO == check_peer_known (ss->peer_map, &attacked_peer))
+    if (NULL != sub &&
+        GNUNET_NO == check_peer_known (sub->peer_map, &attacked_peer))
     {
-      (void) issue_peer_online_check (ss, &attacked_peer);
+      (void) issue_peer_online_check (sub, &attacked_peer);
     }
 
     LOG (GNUNET_ERROR_TYPE_DEBUG,
@@ -3527,16 +3656,20 @@ handle_client_act_malicious (void *cls,
          GNUNET_i2s (&attacked_peer));
 
     /* Substitute do_round () with do_mal_round () */
-    GNUNET_SCHEDULER_cancel (ss->do_round_task);
-    ss->do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, ss);
+    if (NULL != sub && NULL != sub->do_round_task)
+    {
+      /* Probably in shutdown */
+      GNUNET_SCHEDULER_cancel (sub->do_round_task);
+      sub->do_round_task = GNUNET_SCHEDULER_add_now (&do_mal_round, sub);
+    }
   }
   else if (0 == mal_type)
   { /* Stop acting malicious */
     GNUNET_array_grow (mal_peers, num_mal_peers, 0);
 
     /* Substitute do_mal_round () with do_round () */
-    GNUNET_SCHEDULER_cancel (ss->do_round_task);
-    ss->do_round_task = GNUNET_SCHEDULER_add_now (&do_round, ss);
+    GNUNET_SCHEDULER_cancel (sub->do_round_task);
+    sub->do_round_task = GNUNET_SCHEDULER_add_now (&do_round, sub);
   }
   else
   {
@@ -3552,7 +3685,7 @@ handle_client_act_malicious (void *cls,
  *
  * This is executed regylary.
  *
- * @param cls Closure - SubSamper
+ * @param cls Closure - Sub
  */
 static void
 do_mal_round (void *cls)
@@ -3561,12 +3694,12 @@ do_mal_round (void *cls)
   uint32_t i;
   struct GNUNET_TIME_Relative time_next_round;
   struct AttackedPeer *tmp_att_peer;
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Going to execute next round maliciously type %" PRIu32 ".\n",
       mal_type);
-  ss->do_round_task = NULL;
+  sub->do_round_task = NULL;
   GNUNET_assert (mal_type <= 3);
   /* Do malicious actions */
   if (1 == mal_type)
@@ -3589,7 +3722,7 @@ do_mal_round (void *cls)
       else
         att_peer_index = att_peer_index->next;
 
-      send_push (get_peer_ctx (ss->peer_map, &att_peer_index->peer_id));
+      send_push (get_peer_ctx (sub->peer_map, &att_peer_index->peer_id));
     }
 
     /* Send PULLs to some peers to learn about additional peers to attack */
@@ -3601,7 +3734,7 @@ do_mal_round (void *cls)
       else
         att_peer_index = tmp_att_peer->next;
 
-      send_pull_request (get_peer_ctx (ss->peer_map, &tmp_att_peer->peer_id));
+      send_pull_request (get_peer_ctx (sub->peer_map, &tmp_att_peer->peer_id));
     }
   }
 
@@ -3612,11 +3745,11 @@ do_mal_round (void *cls)
      * Send as many pushes to the attacked peer as possible
      * That is one push per round as it will ignore more.
      */
-    (void) issue_peer_online_check (ss, &attacked_peer);
-    if (GNUNET_YES == check_peer_flag (ss->peer_map,
+    (void) issue_peer_online_check (sub, &attacked_peer);
+    if (GNUNET_YES == check_peer_flag (sub->peer_map,
                                        &attacked_peer,
                                        Peers_ONLINE))
-      send_push (get_peer_ctx (ss->peer_map, &attacked_peer));
+      send_push (get_peer_ctx (sub->peer_map, &attacked_peer));
   }
 
 
@@ -3624,20 +3757,20 @@ do_mal_round (void *cls)
   { /* Combined attack */
 
     /* Send PUSH to attacked peers */
-    if (GNUNET_YES == check_peer_known (ss->peer_map, &attacked_peer))
+    if (GNUNET_YES == check_peer_known (sub->peer_map, &attacked_peer))
     {
-      (void) issue_peer_online_check (ss, &attacked_peer);
-      if (GNUNET_YES == check_peer_flag (ss->peer_map,
+      (void) issue_peer_online_check (sub, &attacked_peer);
+      if (GNUNET_YES == check_peer_flag (sub->peer_map,
                                          &attacked_peer,
                                          Peers_ONLINE))
       {
         LOG (GNUNET_ERROR_TYPE_DEBUG,
             "Goding to send push to attacked peer (%s)\n",
             GNUNET_i2s (&attacked_peer));
-        send_push (get_peer_ctx (ss->peer_map, &attacked_peer));
+        send_push (get_peer_ctx (sub->peer_map, &attacked_peer));
       }
     }
-    (void) issue_peer_online_check (ss, &attacked_peer);
+    (void) issue_peer_online_check (sub, &attacked_peer);
 
     /* The maximum of pushes we're going to send this round */
     num_pushes = GNUNET_MIN (GNUNET_MIN (push_limit - 1,
@@ -3655,7 +3788,7 @@ do_mal_round (void *cls)
       else
         att_peer_index = att_peer_index->next;
 
-      send_push (get_peer_ctx (ss->peer_map, &att_peer_index->peer_id));
+      send_push (get_peer_ctx (sub->peer_map, &att_peer_index->peer_id));
     }
 
     /* Send PULLs to some peers to learn about additional peers to attack */
@@ -3667,18 +3800,16 @@ do_mal_round (void *cls)
       else
         att_peer_index = tmp_att_peer->next;
 
-      send_pull_request (get_peer_ctx (ss->peer_map, &tmp_att_peer->peer_id));
+      send_pull_request (get_peer_ctx (sub->peer_map, &tmp_att_peer->peer_id));
     }
   }
 
   /* Schedule next round */
-  time_next_round = compute_rand_delay (ss->round_interval, 2);
+  time_next_round = compute_rand_delay (sub->round_interval, 2);
 
-  //ss->do_round_task = GNUNET_SCHEDULER_add_delayed (ss->round_interval, 
&do_mal_round,
-  //NULL);
-  GNUNET_assert (NULL == ss->do_round_task);
-  ss->do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
-                                                    &do_mal_round, ss);
+  GNUNET_assert (NULL == sub->do_round_task);
+  sub->do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
+                                                    &do_mal_round, sub);
   LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
 }
 #endif /* ENABLE_MALICIOUS */
@@ -3688,7 +3819,7 @@ do_mal_round (void *cls)
  *
  * This is executed regylary.
  *
- * @param cls Closure - SubSampler
+ * @param cls Closure - Sub
  */
 static void
 do_round (void *cls)
@@ -3702,66 +3833,66 @@ do_round (void *cls)
   uint32_t second_border;
   struct GNUNET_PeerIdentity peer;
   struct GNUNET_PeerIdentity *update_peer;
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Going to execute next round.\n");
   GNUNET_STATISTICS_update(stats, "# rounds", 1, GNUNET_NO);
-  ss->do_round_task = NULL;
+  sub->do_round_task = NULL;
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "Printing view:\n");
-  to_file (ss->file_name_view_log,
+  to_file (sub->file_name_view_log,
            "___ new round ___");
-  view_array = View_get_as_array (ss->view);
-  for (i = 0; i < View_size (ss->view); i++)
+  view_array = View_get_as_array (sub->view);
+  for (i = 0; i < View_size (sub->view); i++)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "\t%s\n", GNUNET_i2s (&view_array[i]));
-    to_file (ss->file_name_view_log,
+    to_file (sub->file_name_view_log,
              "=%s\t(do round)",
              GNUNET_i2s_full (&view_array[i]));
   }
 
 
   /* Send pushes and pull requests */
-  if (0 < View_size (ss->view))
+  if (0 < View_size (sub->view))
   {
     permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
-                                           View_size (ss->view));
+                                           View_size (sub->view));
 
     /* Send PUSHes */
-    a_peers = ceil (alpha * View_size (ss->view));
+    a_peers = ceil (alpha * View_size (sub->view));
 
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Going to send pushes to %u (ceil (%f * %u)) peers.\n",
-         a_peers, alpha, View_size (ss->view));
+         a_peers, alpha, View_size (sub->view));
     for (i = 0; i < a_peers; i++)
     {
       peer = view_array[permut[i]];
       // FIXME if this fails schedule/loop this for later
-      send_push (get_peer_ctx (ss->peer_map, &peer));
+      send_push (get_peer_ctx (sub->peer_map, &peer));
     }
 
     /* Send PULL requests */
-    b_peers = ceil (beta * View_size (ss->view));
+    b_peers = ceil (beta * View_size (sub->view));
     first_border = a_peers;
     second_border = a_peers + b_peers;
-    if (second_border > View_size (ss->view))
+    if (second_border > View_size (sub->view))
     {
-      first_border = View_size (ss->view) - b_peers;
-      second_border = View_size (ss->view);
+      first_border = View_size (sub->view) - b_peers;
+      second_border = View_size (sub->view);
     }
     LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Going to send pulls to %u (ceil (%f * %u)) peers.\n",
-        b_peers, beta, View_size (ss->view));
+        b_peers, beta, View_size (sub->view));
     for (i = first_border; i < second_border; i++)
     {
       peer = view_array[permut[i]];
-      if ( GNUNET_NO == check_peer_flag (ss->peer_map,
+      if ( GNUNET_NO == check_peer_flag (sub->peer_map,
                                          &peer,
                                          Peers_PULL_REPLY_PENDING))
       { // FIXME if this fails schedule/loop this for later
-        send_pull_request (get_peer_ctx (ss->peer_map, &peer));
+        send_pull_request (get_peer_ctx (sub->peer_map, &peer));
       }
     }
 
@@ -3773,10 +3904,9 @@ do_round (void *cls)
   /* Update view */
   /* TODO see how many peers are in push-/pull- list! */
 
-  if ((CustomPeerMap_size (ss->push_map) <= alpha * ss->view_size_est_need) &&
-      (0 < CustomPeerMap_size (ss->push_map)) &&
-      (0 < CustomPeerMap_size (ss->pull_map)))
-  //if (GNUNET_YES) // disable blocking temporarily
+  if ((CustomPeerMap_size (sub->push_map) <= alpha * sub->view_size_est_need) 
&&
+      (0 < CustomPeerMap_size (sub->push_map)) &&
+      (0 < CustomPeerMap_size (sub->pull_map)))
   { /* If conditions for update are fulfilled, update */
     LOG (GNUNET_ERROR_TYPE_DEBUG, "Update of the view.\n");
 
@@ -3788,23 +3918,23 @@ do_round (void *cls)
     peers_to_clean_size = 0;
     GNUNET_array_grow (peers_to_clean,
                        peers_to_clean_size,
-                       View_size (ss->view));
+                       View_size (sub->view));
     GNUNET_memcpy (peers_to_clean,
             view_array,
-            View_size (ss->view) * sizeof (struct GNUNET_PeerIdentity));
+            View_size (sub->view) * sizeof (struct GNUNET_PeerIdentity));
 
     /* Seems like recreating is the easiest way of emptying the peermap */
-    View_clear (ss->view);
-    to_file (ss->file_name_view_log,
+    View_clear (sub->view);
+    to_file (sub->file_name_view_log,
              "--- emptied ---");
 
-    first_border  = GNUNET_MIN (ceil (alpha * ss->view_size_est_need),
-                                CustomPeerMap_size (ss->push_map));
+    first_border  = GNUNET_MIN (ceil (alpha * sub->view_size_est_need),
+                                CustomPeerMap_size (sub->push_map));
     second_border = first_border +
-                    GNUNET_MIN (floor (beta  * ss->view_size_est_need),
-                                CustomPeerMap_size (ss->pull_map));
+                    GNUNET_MIN (floor (beta  * sub->view_size_est_need),
+                                CustomPeerMap_size (sub->pull_map));
     final_size    = second_border +
-      ceil ((1 - (alpha + beta)) * ss->view_size_est_need);
+      ceil ((1 - (alpha + beta)) * sub->view_size_est_need);
     LOG (GNUNET_ERROR_TYPE_DEBUG,
         "first border: %" PRIu32 ", second border: %" PRIu32 ", final size: 
%"PRIu32 "\n",
         first_border,
@@ -3813,19 +3943,20 @@ do_round (void *cls)
 
     /* Update view with peers received through PUSHes */
     permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
-                                           CustomPeerMap_size (ss->push_map));
+                                           CustomPeerMap_size (sub->push_map));
     for (i = 0; i < first_border; i++)
     {
       int inserted;
-      inserted = insert_in_view (ss,
-                                 CustomPeerMap_get_peer_by_index (ss->push_map,
+      inserted = insert_in_view (sub,
+                                 CustomPeerMap_get_peer_by_index 
(sub->push_map,
                                                                   permut[i]));
       if (GNUNET_OK == inserted)
       {
-        clients_notify_stream_peer (1,
-            CustomPeerMap_get_peer_by_index (ss->push_map, permut[i]));
+        clients_notify_stream_peer (sub,
+            1,
+            CustomPeerMap_get_peer_by_index (sub->push_map, permut[i]));
       }
-      to_file (ss->file_name_view_log,
+      to_file (sub->file_name_view_log,
                "+%s\t(push list)",
                GNUNET_i2s_full (&view_array[i]));
       // TODO change the peer_flags accordingly
@@ -3835,20 +3966,21 @@ do_round (void *cls)
 
     /* Update view with peers received through PULLs */
     permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
-                                           CustomPeerMap_size (ss->pull_map));
+                                           CustomPeerMap_size (sub->pull_map));
     for (i = first_border; i < second_border; i++)
     {
       int inserted;
-      inserted = insert_in_view (ss,
-          CustomPeerMap_get_peer_by_index (ss->pull_map,
+      inserted = insert_in_view (sub,
+          CustomPeerMap_get_peer_by_index (sub->pull_map,
                                            permut[i - first_border]));
       if (GNUNET_OK == inserted)
       {
-        clients_notify_stream_peer (1,
-            CustomPeerMap_get_peer_by_index (ss->pull_map,
+        clients_notify_stream_peer (sub,
+            1,
+            CustomPeerMap_get_peer_by_index (sub->pull_map,
                                              permut[i - first_border]));
       }
-      to_file (ss->file_name_view_log,
+      to_file (sub->file_name_view_log,
                "+%s\t(pull list)",
                GNUNET_i2s_full (&view_array[i]));
       // TODO change the peer_flags accordingly
@@ -3857,106 +3989,106 @@ do_round (void *cls)
     permut = NULL;
 
     /* Update view with peers from history */
-    RPS_sampler_get_n_rand_peers (ss->sampler,
+    RPS_sampler_get_n_rand_peers (sub->sampler,
                                   final_size - second_border,
                                   hist_update,
-                                  ss);
+                                  sub);
     // TODO change the peer_flags accordingly
 
-    for (i = 0; i < View_size (ss->view); i++)
+    for (i = 0; i < View_size (sub->view); i++)
       rem_from_list (&peers_to_clean, &peers_to_clean_size, &view_array[i]);
 
     /* Clean peers that were removed from the view */
     for (i = 0; i < peers_to_clean_size; i++)
     {
-      to_file (ss->file_name_view_log,
+      to_file (sub->file_name_view_log,
                "-%s",
                GNUNET_i2s_full (&peers_to_clean[i]));
-      clean_peer (ss, &peers_to_clean[i]);
+      clean_peer (sub, &peers_to_clean[i]);
     }
 
     GNUNET_array_grow (peers_to_clean, peers_to_clean_size, 0);
-    clients_notify_view_update (ss);
+    clients_notify_view_update (sub);
   } else {
     LOG (GNUNET_ERROR_TYPE_DEBUG, "No update of the view.\n");
     GNUNET_STATISTICS_update(stats, "# rounds blocked", 1, GNUNET_NO);
-    if (CustomPeerMap_size (ss->push_map) > alpha * View_size (ss->view) &&
-        !(0 >= CustomPeerMap_size (ss->pull_map)))
+    if (CustomPeerMap_size (sub->push_map) > alpha * View_size (sub->view) &&
+        !(0 >= CustomPeerMap_size (sub->pull_map)))
       GNUNET_STATISTICS_update(stats, "# rounds blocked - too many pushes", 1, 
GNUNET_NO);
-    if (CustomPeerMap_size (ss->push_map) > alpha * View_size (ss->view) &&
-        (0 >= CustomPeerMap_size (ss->pull_map)))
+    if (CustomPeerMap_size (sub->push_map) > alpha * View_size (sub->view) &&
+        (0 >= CustomPeerMap_size (sub->pull_map)))
       GNUNET_STATISTICS_update(stats, "# rounds blocked - too many pushes, no 
pull replies", 1, GNUNET_NO);
-    if (0 >= CustomPeerMap_size (ss->push_map) &&
-        !(0 >= CustomPeerMap_size (ss->pull_map)))
+    if (0 >= CustomPeerMap_size (sub->push_map) &&
+        !(0 >= CustomPeerMap_size (sub->pull_map)))
       GNUNET_STATISTICS_update(stats, "# rounds blocked - no pushes", 1, 
GNUNET_NO);
-    if (0 >= CustomPeerMap_size (ss->push_map) &&
-        (0 >= CustomPeerMap_size (ss->pull_map)))
+    if (0 >= CustomPeerMap_size (sub->push_map) &&
+        (0 >= CustomPeerMap_size (sub->pull_map)))
       GNUNET_STATISTICS_update(stats, "# rounds blocked - no pushes, no pull 
replies", 1, GNUNET_NO);
-    if (0 >= CustomPeerMap_size (ss->pull_map) &&
-        CustomPeerMap_size (ss->push_map) > alpha * View_size (ss->view) &&
-        0 >= CustomPeerMap_size (ss->push_map))
+    if (0 >= CustomPeerMap_size (sub->pull_map) &&
+        CustomPeerMap_size (sub->push_map) > alpha * View_size (sub->view) &&
+        0 >= CustomPeerMap_size (sub->push_map))
       GNUNET_STATISTICS_update(stats, "# rounds blocked - no pull replies", 1, 
GNUNET_NO);
   }
   // TODO independent of that also get some peers from CADET_get_peers()?
   GNUNET_STATISTICS_set (stats,
       "# peers in push map at end of round",
-      CustomPeerMap_size (ss->push_map),
+      CustomPeerMap_size (sub->push_map),
       GNUNET_NO);
   GNUNET_STATISTICS_set (stats,
       "# peers in pull map at end of round",
-      CustomPeerMap_size (ss->pull_map),
+      CustomPeerMap_size (sub->pull_map),
       GNUNET_NO);
   GNUNET_STATISTICS_set (stats,
       "# peers in view at end of round",
-      View_size (ss->view),
+      View_size (sub->view),
       GNUNET_NO);
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
-       "Received %u pushes and %u pulls last round (alpha (%.2f) * view_size 
(ss->view%u) = %.2f)\n",
-       CustomPeerMap_size (ss->push_map),
-       CustomPeerMap_size (ss->pull_map),
+       "Received %u pushes and %u pulls last round (alpha (%.2f) * view_size 
(sub->view%u) = %.2f)\n",
+       CustomPeerMap_size (sub->push_map),
+       CustomPeerMap_size (sub->pull_map),
        alpha,
-       View_size (ss->view),
-       alpha * View_size (ss->view));
+       View_size (sub->view),
+       alpha * View_size (sub->view));
 
   /* Update samplers */
-  for (i = 0; i < CustomPeerMap_size (ss->push_map); i++)
+  for (i = 0; i < CustomPeerMap_size (sub->push_map); i++)
   {
-    update_peer = CustomPeerMap_get_peer_by_index (ss->push_map, i);
+    update_peer = CustomPeerMap_get_peer_by_index (sub->push_map, i);
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Updating with peer %s from push list\n",
          GNUNET_i2s (update_peer));
-    insert_in_sampler (ss, update_peer);
-    clean_peer (ss, update_peer); /* This cleans only if it is not in the view 
*/
+    insert_in_sampler (sub, update_peer);
+    clean_peer (sub, update_peer); /* This cleans only if it is not in the 
view */
   }
 
-  for (i = 0; i < CustomPeerMap_size (ss->pull_map); i++)
+  for (i = 0; i < CustomPeerMap_size (sub->pull_map); i++)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Updating with peer %s from pull list\n",
-         GNUNET_i2s (CustomPeerMap_get_peer_by_index (ss->pull_map, i)));
-    insert_in_sampler (ss, CustomPeerMap_get_peer_by_index (ss->pull_map, i));
+         GNUNET_i2s (CustomPeerMap_get_peer_by_index (sub->pull_map, i)));
+    insert_in_sampler (sub, CustomPeerMap_get_peer_by_index (sub->pull_map, 
i));
     /* This cleans only if it is not in the view */
-    clean_peer (ss, CustomPeerMap_get_peer_by_index (ss->pull_map, i));
+    clean_peer (sub, CustomPeerMap_get_peer_by_index (sub->pull_map, i));
   }
 
 
   /* Empty push/pull lists */
-  CustomPeerMap_clear (ss->push_map);
-  CustomPeerMap_clear (ss->pull_map);
+  CustomPeerMap_clear (sub->push_map);
+  CustomPeerMap_clear (sub->pull_map);
 
   GNUNET_STATISTICS_set (stats,
                          "view size",
-                         View_size(ss->view),
+                         View_size(sub->view),
                          GNUNET_NO);
 
   struct GNUNET_TIME_Relative time_next_round;
 
-  time_next_round = compute_rand_delay (ss->round_interval, 2);
+  time_next_round = compute_rand_delay (sub->round_interval, 2);
 
   /* Schedule next round */
-  ss->do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
-                                                    &do_round, ss);
+  sub->do_round_task = GNUNET_SCHEDULER_add_delayed (time_next_round,
+                                                     &do_round, sub);
   LOG (GNUNET_ERROR_TYPE_DEBUG, "Finished round\n");
 }
 
@@ -3969,7 +4101,7 @@ do_round (void *cls)
  *
  * implements #GNUNET_CADET_PeersCB
  *
- * @param cls Closure - SubSampler
+ * @param cls Closure - Sub
  * @param peer Peer, or NULL on "EOF".
  * @param tunnel Do we have a tunnel towards this peer?
  * @param n_paths Number of known paths towards this peer.
@@ -3979,12 +4111,12 @@ do_round (void *cls)
 void
 init_peer_cb (void *cls,
               const struct GNUNET_PeerIdentity *peer,
-              int tunnel, // "Do we have a tunnel towards this peer?"
-              unsigned int n_paths, // "Number of known paths towards this 
peer"
-              unsigned int best_path) // "How long is the best path?
-                                      // (0 = unknown, 1 = ourselves, 2 = 
neighbor)"
+              int tunnel, /* "Do we have a tunnel towards this peer?" */
+              unsigned int n_paths, /* "Number of known paths towards this 
peer" */
+              unsigned int best_path) /* "How long is the best path?
+                                       * (0 = unknown, 1 = ourselves, 2 = 
neighbor)" */
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
   (void) tunnel;
   (void) n_paths;
   (void) best_path;
@@ -3994,7 +4126,7 @@ init_peer_cb (void *cls,
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Got peer_id %s from cadet\n",
          GNUNET_i2s (peer));
-    got_peer (ss, peer);
+    got_peer (sub, peer);
   }
 }
 
@@ -4004,7 +4136,7 @@ init_peer_cb (void *cls,
  *
  * We initialise the sampler with those.
  *
- * @param cls Closure - SubSampler
+ * @param cls Closure - Sub
  * @param peer the peer id
  * @return #GNUNET_YES if we should continue to
  *         iterate,
@@ -4014,14 +4146,14 @@ static int
 valid_peers_iterator (void *cls,
                       const struct GNUNET_PeerIdentity *peer)
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
 
   if (NULL != peer)
   {
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Got stored, valid peer %s\n",
          GNUNET_i2s (peer));
-    got_peer (ss, peer);
+    got_peer (sub, peer);
   }
   return GNUNET_YES;
 }
@@ -4030,7 +4162,7 @@ valid_peers_iterator (void *cls,
 /**
  * Iterator over peers from peerinfo.
  *
- * @param cls Closure - SubSampler
+ * @param cls Closure - Sub
  * @param peer id of the peer, NULL for last call
  * @param hello hello message for the peer (can be NULL)
  * @param error message
@@ -4041,7 +4173,7 @@ process_peerinfo_peers (void *cls,
                         const struct GNUNET_HELLO_Message *hello,
                         const char *err_msg)
 {
-  struct SubSampler *ss = cls;
+  struct Sub *sub = cls;
   (void) hello;
   (void) err_msg;
 
@@ -4050,7 +4182,7 @@ process_peerinfo_peers (void *cls,
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "Got peer_id %s from peerinfo\n",
          GNUNET_i2s (peer));
-    got_peer (ss, peer);
+    got_peer (sub, peer);
   }
 }
 
@@ -4058,14 +4190,13 @@ process_peerinfo_peers (void *cls,
 /**
  * Task run during shutdown.
  *
- * @param cls Closure - SubSampler containing all datastructures to clean
+ * @param cls Closure - unused
  */
 static void
 shutdown_task (void *cls)
 {
-  struct ClientContext *client_ctx;
   (void) cls;
-  struct SubSampler *ss = cls;
+  struct ClientContext *client_ctx;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "RPS service is going down\n");
@@ -4077,39 +4208,28 @@ shutdown_task (void *cls)
   {
     destroy_cli_ctx (client_ctx);
   }
-  GNUNET_PEERINFO_notify_cancel (peerinfo_notify_handle);
-  GNUNET_PEERINFO_disconnect (peerinfo_handle);
-  peerinfo_handle = NULL;
-  if (NULL != ss->do_round_task)
+  if (NULL != msub)
   {
-    GNUNET_SCHEDULER_cancel (ss->do_round_task);
-    ss->do_round_task = NULL;
+    destroy_sub (msub);
+    msub = NULL;
   }
 
-  peers_terminate (ss);
-
+  /* Disconnect from other services */
+  GNUNET_PEERINFO_notify_cancel (peerinfo_notify_handle);
+  GNUNET_PEERINFO_disconnect (peerinfo_handle);
+  peerinfo_handle = NULL;
   GNUNET_NSE_disconnect (nse);
-  RPS_sampler_destroy (ss->sampler);
-  GNUNET_CADET_close_port (ss->cadet_port);
-  GNUNET_CADET_disconnect (ss->cadet_handle);
-  ss->cadet_handle = NULL;
-  View_destroy (ss->view);
-  CustomPeerMap_destroy (ss->push_map);
-  CustomPeerMap_destroy (ss->pull_map);
+
   if (NULL != stats)
   {
     GNUNET_STATISTICS_destroy (stats,
                                GNUNET_NO);
     stats = NULL;
   }
+  GNUNET_CADET_disconnect (cadet_handle);
+  cadet_handle = NULL;
 #ifdef ENABLE_MALICIOUS
   struct AttackedPeer *tmp_att_peer;
-  /* it is ok to free this const during shutdown: */
-  GNUNET_free ((char *) ss->file_name_view_log);
-#ifdef TO_FILE
-  GNUNET_free ((char *) ss->file_name_observed_log);
-  GNUNET_CONTAINER_multipeermap_destroy (ss->observed_unique_peers);
-#endif /* TO_FILE */
   GNUNET_array_grow (mal_peers,
                      num_mal_peers,
                      0);
@@ -4154,7 +4274,6 @@ client_connect_cb (void *cls,
   cli_ctx->view_updates_left = -1;
   cli_ctx->stream_update = GNUNET_NO;
   cli_ctx->client = client;
-  cli_ctx->ss = mss;
   GNUNET_CONTAINER_DLL_insert (cli_ctx_head,
                                cli_ctx_tail,
                                cli_ctx);
@@ -4206,6 +4325,8 @@ run (void *cls,
   char *fn_valid_peers;
   struct GNUNET_TIME_Relative round_interval;
   long long unsigned int sampler_size;
+  char hash_port_string[] = GNUNET_APPLICATION_PORT_RPS;
+  struct GNUNET_HashCode hash;
 
   (void) cls;
   (void) service;
@@ -4262,40 +4383,43 @@ run (void *cls,
                                "FILENAME_VALID_PEERS");
   }
 
+  cadet_handle = GNUNET_CADET_connect (cfg);
+  GNUNET_assert (NULL != cadet_handle);
+
+
   alpha = 0.45;
   beta  = 0.45;
 
 
-  /* Set up main SubSampler */
-  mss = new_subsampler ("", /* this is the main sampler - no shared value */
-                         sampler_size, /* Will be overwritten by config */
-                         round_interval);
+  /* Set up main Sub */
+  GNUNET_CRYPTO_hash (hash_port_string,
+                      strlen (hash_port_string),
+                      &hash);
+  msub = new_sub (&hash,
+                 sampler_size, /* Will be overwritten by config */
+                 round_interval);
 
 
   peerinfo_handle = GNUNET_PEERINFO_connect (cfg);
 
   /* connect to NSE */
-  nse = GNUNET_NSE_connect (cfg, nse_callback, mss);
+  nse = GNUNET_NSE_connect (cfg, nse_callback, NULL);
 
   //LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting peers from CADET\n");
-  //GNUNET_CADET_get_peers (mss.cadet_handle, &init_peer_cb, mss);
+  //GNUNET_CADET_get_peers (cadet_handle, &init_peer_cb, msub);
   // TODO send push/pull to each of those peers?
-  // TODO read stored valid peers from last run
   LOG (GNUNET_ERROR_TYPE_DEBUG, "Requesting stored valid peers\n");
-  restore_valid_peers (mss);
-  get_valid_peers (mss->valid_peers, valid_peers_iterator, mss);
+  restore_valid_peers (msub);
+  get_valid_peers (msub->valid_peers, valid_peers_iterator, msub);
 
   peerinfo_notify_handle = GNUNET_PEERINFO_notify (cfg,
                                                    GNUNET_NO,
                                                    process_peerinfo_peers,
-                                                   mss);
+                                                   msub);
 
   LOG (GNUNET_ERROR_TYPE_INFO, "Ready to receive requests from clients\n");
 
-  mss->do_round_task = GNUNET_SCHEDULER_add_now (&do_round, mss);
-  LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled first round\n");
-
-  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, mss);
+  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
   stats = GNUNET_STATISTICS_create ("rps", cfg);
 }
 
@@ -4336,6 +4460,14 @@ GNUNET_SERVICE_MAIN
    GNUNET_MESSAGE_TYPE_RPS_CS_DEBUG_STREAM_CANCEL,
    struct GNUNET_MessageHeader,
    NULL),
+ GNUNET_MQ_hd_fixed_size (client_start_sub,
+   GNUNET_MESSAGE_TYPE_RPS_CS_SUB_START,
+   struct GNUNET_RPS_CS_SubStartMessage,
+   NULL),
+ GNUNET_MQ_hd_fixed_size (client_stop_sub,
+   GNUNET_MESSAGE_TYPE_RPS_CS_SUB_STOP,
+   struct GNUNET_RPS_CS_SubStopMessage,
+   NULL),
  GNUNET_MQ_handler_end());
 
 /* end of gnunet-service-rps.c */
diff --git a/src/rps/rps.h b/src/rps/rps.h
index 915524f88..616eabdac 100644
--- a/src/rps/rps.h
+++ b/src/rps/rps.h
@@ -114,6 +114,50 @@ struct GNUNET_RPS_CS_ActMaliciousMessage
 #endif /* ENABLE_MALICIOUS */
 
 
+/**
+ * Message from client to service telling it to start a new sub
+ */
+struct GNUNET_RPS_CS_SubStartMessage
+{
+  /**
+   * Header including size and type in NBO
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * For alignment.
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Mean interval between two rounds
+   */
+  struct GNUNET_TIME_RelativeNBO round_interval;
+
+  /**
+   * Length of the shared value represented as string.
+   */
+  struct GNUNET_HashCode hash GNUNET_PACKED;
+};
+
+
+/**
+ * Message from client to service telling it to stop a new sub
+ */
+struct GNUNET_RPS_CS_SubStopMessage
+{
+  /**
+   * Header including size and type in NBO
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Length of the shared value represented as string.
+   */
+  struct GNUNET_HashCode hash GNUNET_PACKED;
+};
+
+
 /* Debug messages */
 
 /**
diff --git a/src/rps/rps_api.c b/src/rps/rps_api.c
index 47c4f019d..34b28cd6a 100644
--- a/src/rps/rps_api.c
+++ b/src/rps/rps_api.c
@@ -588,6 +588,24 @@ mq_error_handler (void *cls,
 
 
 /**
+ * @brief Create the hash value from the share value that defines the sub
+ * (-group)
+ *
+ * @param share_val Share value - strings longer than 508 (512 - 4) will be
+ *        truncated.
+ * @param hash Pointer to the location in which the hash will be stored.
+ */
+static void
+hash_from_share_val (const char *share_val, struct GNUNET_HashCode *hash)
+{
+  char hash_port_string[512] = "rps";
+
+  (void) strncat (hash_port_string, share_val, 508);
+  GNUNET_CRYPTO_hash (hash_port_string, strlen (hash_port_string), hash);
+}
+
+
+/**
  * Reconnect to the service
  */
 static void
@@ -639,6 +657,49 @@ GNUNET_RPS_connect (const struct 
GNUNET_CONFIGURATION_Handle *cfg)
 
 
 /**
+ * @brief Start a sub with the given shared value
+ *
+ * @param h Handle to rps
+ * @param shared_value The shared value that defines the members of the sub 
(-gorup)
+ */
+void
+GNUNET_RPS_sub_start (struct GNUNET_RPS_Handle *h,
+                      const char *shared_value)
+{
+  struct GNUNET_RPS_CS_SubStartMessage *msg;
+  struct GNUNET_MQ_Envelope *ev;
+
+  ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_RPS_CS_SUB_START);
+  hash_from_share_val (shared_value, &msg->hash);
+  msg->round_interval = GNUNET_TIME_relative_hton (// TODO read from config!
+    GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30));
+  GNUNET_assert (0 != msg->round_interval.rel_value_us__);
+
+  GNUNET_MQ_send (h->mq, ev);
+}
+
+
+/**
+ * @brief Stop a sub with the given shared value
+ *
+ * @param h Handle to rps
+ * @param shared_value The shared value that defines the members of the sub 
(-gorup)
+ */
+void
+GNUNET_RPS_sub_stop (struct GNUNET_RPS_Handle *h,
+                     const char *shared_value)
+{
+  struct GNUNET_RPS_CS_SubStopMessage *msg;
+  struct GNUNET_MQ_Envelope *ev;
+
+  ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_RPS_CS_SUB_STOP);
+  hash_from_share_val (shared_value, &msg->hash);
+
+  GNUNET_MQ_send (h->mq, ev);
+}
+
+
+/**
  * Request n random peers.
  *
  * @param rps_handle handle to the rps service

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