Sometimes it's OK if multiplication overflows
[oweals/gnunet.git] / src / fs / gnunet-service-fs_pr.c
index 9233658ebe9c7dd3bd683635dbc51bf47fbb6fae..63462f7dcd216b009714d6bc2eb246d1ed50ef53 100644 (file)
@@ -1,6 +1,6 @@
 /*
      This file is part of GNUnet.
-     (C) 2009, 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
+     Copyright (C) 2009-2013 GNUnet e.V.
 
      GNUnet is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published
@@ -14,8 +14,8 @@
 
      You should have received a copy of the GNU General Public License
      along with GNUnet; see the file COPYING.  If not, write to the
-     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-     Boston, MA 02111-1307, USA.
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
 */
 
 /**
  * @author Christian Grothoff
  */
 #include "platform.h"
+#include "gnunet_util_lib.h"
 #include "gnunet_load_lib.h"
 #include "gnunet-service-fs.h"
 #include "gnunet-service-fs_cp.h"
 #include "gnunet-service-fs_indexing.h"
 #include "gnunet-service-fs_pe.h"
 #include "gnunet-service-fs_pr.h"
+#include "gnunet-service-fs_cadet.h"
+
+
+/**
+ * Desired replication level for GETs.
+ */
+#define DHT_GET_REPLICATION 5
 
 /**
  * Maximum size of the datastore queue for P2P operations.  Needs to
- * be large enough to queue MAX_QUEUE_PER_PEER operations for roughly
+ * be large enough to queue #MAX_QUEUE_PER_PEER operations for roughly
  * the number of active (connected) peers.
  */
 #define MAX_DATASTORE_QUEUE (16 * MAX_QUEUE_PER_PEER)
  */
 #define INSANE_STATISTICS GNUNET_NO
 
+/**
+ * If obtaining a block via cadet fails, how often do we retry it before
+ * giving up for good (and sticking to non-anonymous transfer)?
+ */
+#define CADET_RETRY_MAX 3
+
+
 /**
  * An active request.
  */
@@ -72,7 +87,7 @@ struct GSF_PendingRequest
   GSF_PendingRequestReplyHandler rh;
 
   /**
-   * Closure for 'rh'
+   * Closure for @e rh
    */
   void *rh_cls;
 
@@ -101,6 +116,11 @@ struct GSF_PendingRequest
    */
   struct GNUNET_DHT_GetHandle *gh;
 
+  /**
+   * Cadet request handle for this request (or NULL for none).
+   */
+  struct GSF_CadetRequest *cadet_request;
+
   /**
    * Function to call upon completion of the local get
    * request, or NULL for none.
@@ -108,7 +128,7 @@ struct GSF_PendingRequest
   GSF_LocalLookupContinuation llc_cont;
 
   /**
-   * Closure for llc_cont.
+   * Closure for @e llc_cont.
    */
   void *llc_cont_cls;
 
@@ -137,7 +157,7 @@ struct GSF_PendingRequest
   /**
    * Task that warns us if the local datastore lookup takes too long.
    */
-  GNUNET_SCHEDULER_TaskIdentifier warn_task;
+  struct GNUNET_SCHEDULER_Task * warn_task;
 
   /**
    * Current offset for querying our local datastore for results.
@@ -153,6 +173,12 @@ struct GSF_PendingRequest
    */
   uint64_t first_uid;
 
+  /**
+   * How often have we retried this request via 'cadet'?
+   * (used to bound overall retries).
+   */
+  unsigned int cadet_retry_count;
+
   /**
    * Number of valid entries in the 'replies_seen' array.
    */
@@ -243,10 +269,9 @@ refresh_bloomfilter (struct GSF_PendingRequest *pr)
  * @param options request options
  * @param type type of the block that is being requested
  * @param query key for the lookup
- * @param namespace namespace to lookup, NULL for no namespace
  * @param target preferred target for the request, NULL for none
  * @param bf_data raw data for bloom filter for known replies, can be NULL
- * @param bf_size number of bytes in bf_data
+ * @param bf_size number of bytes in @a bf_data
  * @param mingle mingle value for bf
  * @param anonymity_level desired anonymity level
  * @param priority maximum outgoing cummulative request priority to use
@@ -254,25 +279,28 @@ refresh_bloomfilter (struct GSF_PendingRequest *pr)
  * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
  * @param origin_pid peer ID of origin of query (do not loop back)
  * @param replies_seen hash codes of known local replies
- * @param replies_seen_count size of the 'replies_seen' array
+ * @param replies_seen_count size of the @a replies_seen array
  * @param rh handle to call when we get a reply
- * @param rh_cls closure for rh
+ * @param rh_cls closure for @a rh
  * @return handle for the new pending request
  */
 struct GSF_PendingRequest *
 GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
                              enum GNUNET_BLOCK_Type type,
-                             const struct GNUNET_HashCode * query,
-                             const struct GNUNET_HashCode * namespace,
+                             const struct GNUNET_HashCode *query,
                              const struct GNUNET_PeerIdentity *target,
-                             const char *bf_data, size_t bf_size,
-                             uint32_t mingle, uint32_t anonymity_level,
-                             uint32_t priority, int32_t ttl,
+                             const char *bf_data,
+                             size_t bf_size,
+                             uint32_t mingle,
+                             uint32_t anonymity_level,
+                             uint32_t priority,
+                             int32_t ttl,
                              GNUNET_PEER_Id sender_pid,
                              GNUNET_PEER_Id origin_pid,
-                             const struct GNUNET_HashCode * replies_seen,
+                             const struct GNUNET_HashCode *replies_seen,
                              unsigned int replies_seen_count,
-                             GSF_PendingRequestReplyHandler rh, void *rh_cls)
+                             GSF_PendingRequestReplyHandler rh,
+                             void *rh_cls)
 {
   struct GSF_PendingRequest *pr;
   struct GSF_PendingRequest *dpr;
@@ -288,8 +316,6 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
                             GNUNET_NO);
 #endif
   extra = 0;
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
-    extra += sizeof (struct GNUNET_HashCode);
   if (NULL != target)
     extra += sizeof (struct GNUNET_PeerIdentity);
   pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest) + extra);
@@ -297,17 +323,12 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
       GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
   pr->public_data.query = *query;
   eptr = (struct GNUNET_HashCode *) &pr[1];
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
-  {
-    GNUNET_assert (NULL != namespace);        
-    pr->public_data.namespace = eptr;
-    memcpy (eptr, namespace, sizeof (struct GNUNET_HashCode));
-    eptr++;
-  }
   if (NULL != target)
   {
     pr->public_data.target = (struct GNUNET_PeerIdentity *) eptr;
-    memcpy (eptr, target, sizeof (struct GNUNET_PeerIdentity));
+    GNUNET_memcpy (eptr,
+            target,
+            sizeof (struct GNUNET_PeerIdentity));
   }
   pr->public_data.anonymity_level = anonymity_level;
   pr->public_data.priority = priority;
@@ -336,14 +357,16 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
     pr->replies_seen_size = replies_seen_count;
     pr->replies_seen =
         GNUNET_malloc (sizeof (struct GNUNET_HashCode) * pr->replies_seen_size);
-    memcpy (pr->replies_seen, replies_seen,
+    GNUNET_memcpy (pr->replies_seen,
+            replies_seen,
             replies_seen_count * sizeof (struct GNUNET_HashCode));
     pr->replies_seen_count = replies_seen_count;
   }
   if (NULL != bf_data)
   {
     pr->bf =
-        GNUNET_CONTAINER_bloomfilter_init (bf_data, bf_size,
+        GNUNET_CONTAINER_bloomfilter_init (bf_data,
+                                           bf_size,
                                            GNUNET_CONSTANTS_BLOOMFILTER_K);
     pr->mingle = mingle;
   }
@@ -352,27 +375,36 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
   {
     refresh_bloomfilter (pr);
   }
-  GNUNET_CONTAINER_multihashmap_put (pr_map, 
-                                    &pr->public_data.query, pr,
+  GNUNET_CONTAINER_multihashmap_put (pr_map,
+                                    &pr->public_data.query,
+                                     pr,
                                      GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
   if (0 == (options & GSF_PRO_REQUEST_NEVER_EXPIRES))
   {
     pr->hnode =
-        GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap, pr,
-                                      pr->public_data.ttl.abs_value);
+        GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap,
+                                      pr,
+                                      pr->public_data.ttl.abs_value_us);
     /* make sure we don't track too many requests */
     while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) >
            max_pending_requests)
     {
       dpr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
-      GNUNET_assert (dpr != NULL);
+      GNUNET_assert (NULL != dpr);
       if (pr == dpr)
         break;                  /* let the request live briefly... */
       if (NULL != dpr->rh)
-       dpr->rh (dpr->rh_cls, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, dpr,
-                UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_ABS,
-                 GNUNET_BLOCK_TYPE_ANY, NULL, 0);
-      GSF_pending_request_cancel_ (dpr, GNUNET_YES);
+       dpr->rh (dpr->rh_cls,
+                 GNUNET_BLOCK_EVALUATION_REQUEST_VALID,
+                 dpr,
+                UINT32_MAX,
+                 GNUNET_TIME_UNIT_FOREVER_ABS,
+                 GNUNET_TIME_UNIT_FOREVER_ABS,
+                 GNUNET_BLOCK_TYPE_ANY,
+                 NULL,
+                 0);
+      GSF_pending_request_cancel_ (dpr,
+                                   GNUNET_YES);
     }
   }
   GNUNET_STATISTICS_update (GSF_stats,
@@ -401,27 +433,21 @@ GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
  *
  * @param pra a pending request
  * @param prb another pending request
- * @return GNUNET_OK if the requests are compatible
+ * @return #GNUNET_OK if the requests are compatible
  */
 int
 GSF_pending_request_is_compatible_ (struct GSF_PendingRequest *pra,
                                     struct GSF_PendingRequest *prb)
 {
-  if ((pra->public_data.type != prb->public_data.type) ||
-      (0 !=
-       memcmp (&pra->public_data.query, &prb->public_data.query,
-               sizeof (struct GNUNET_HashCode))) ||
-      ((pra->public_data.type == GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
-       (0 !=
-        memcmp (pra->public_data.namespace, 
-               prb->public_data.namespace,
-                sizeof (struct GNUNET_HashCode)))))
+  if ( (pra->public_data.type != prb->public_data.type) ||
+       (0 != memcmp (&pra->public_data.query,
+                     &prb->public_data.query,
+                     sizeof (struct GNUNET_HashCode))))
     return GNUNET_NO;
   return GNUNET_OK;
 }
 
 
-
 /**
  * Update a given pending request with additional replies
  * that have been seen.
@@ -446,7 +472,7 @@ GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
     if (replies_seen_count + pr->replies_seen_count > pr->replies_seen_size)
       GNUNET_array_grow (pr->replies_seen, pr->replies_seen_size,
                          replies_seen_count + pr->replies_seen_count);
-    memcpy (&pr->replies_seen[pr->replies_seen_count], replies_seen,
+    GNUNET_memcpy (&pr->replies_seen[pr->replies_seen_count], replies_seen,
             sizeof (struct GNUNET_HashCode) * replies_seen_count);
     pr->replies_seen_count += replies_seen_count;
     refresh_bloomfilter (pr);
@@ -458,21 +484,26 @@ GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
       /* we're not the initiator, but the initiator did not give us
        * any bloom-filter, so we need to create one on-the-fly */
       pr->mingle =
-          GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
+          GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+                                    UINT32_MAX);
       pr->bf =
-          GNUNET_BLOCK_construct_bloomfilter (pr->mingle, replies_seen,
+          GNUNET_BLOCK_construct_bloomfilter (pr->mingle,
+                                              replies_seen,
                                               replies_seen_count);
     }
     else
     {
       for (i = 0; i < pr->replies_seen_count; i++)
       {
-        GNUNET_BLOCK_mingle_hash (&replies_seen[i], pr->mingle, &mhash);
-        GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
+        GNUNET_BLOCK_mingle_hash (&replies_seen[i],
+                                  pr->mingle,
+                                  &mhash);
+        GNUNET_CONTAINER_bloomfilter_add (pr->bf,
+                                          &mhash);
       }
     }
   }
-  if (NULL != pr->gh) 
+  if (NULL != pr->gh)
     GNUNET_DHT_get_filter_known_results (pr->gh,
                                         replies_seen_count,
                                         replies_seen);
@@ -481,21 +512,17 @@ GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
 
 /**
  * Generate the message corresponding to the given pending request for
- * transmission to other peers (or at least determine its size).
+ * transmission to other peers.
  *
  * @param pr request to generate the message for
- * @param buf_size number of bytes available in buf
- * @param buf where to copy the message (can be NULL)
- * @return number of bytes needed (if > buf_size) or used
+ * @return envelope with the request message
  */
-size_t
-GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
-                                  size_t buf_size, void *buf)
+struct GNUNET_MQ_Envelope *
+GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr)
 {
-  char lbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
+  struct GNUNET_MQ_Envelope *env;
   struct GetMessage *gm;
-  struct GNUNET_HashCode *ext;
-  size_t msize;
+  struct GNUNET_PeerIdentity *ext;
   unsigned int k;
   uint32_t bm;
   uint32_t prio;
@@ -504,10 +531,10 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
   int64_t ttl;
   int do_route;
 
-  if (buf_size > 0)
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Building request message for `%s' of type %d\n",
-                GNUNET_h2s (&pr->public_data.query), pr->public_data.type);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+             "Building request message for `%s' of type %d\n",
+             GNUNET_h2s (&pr->public_data.query),
+             pr->public_data.type);
   k = 0;
   bm = 0;
   do_route = (0 == (pr->public_data.options & GSF_PRO_FORWARD_ONLY));
@@ -521,24 +548,15 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
     bm |= GET_MESSAGE_BIT_RETURN_TO;
     k++;
   }
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
-  {
-    bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
-    k++;
-  }
   if (NULL != pr->public_data.target)
   {
     bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
     k++;
   }
   bf_size = GNUNET_CONTAINER_bloomfilter_get_size (pr->bf);
-  msize = sizeof (struct GetMessage) + bf_size + k * sizeof (struct GNUNET_HashCode);
-  GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
-  if (buf_size < msize)
-    return msize;
-  gm = (struct GetMessage *) lbuf;
-  gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
-  gm->header.size = htons (msize);
+  env = GNUNET_MQ_msg_extra (gm,
+                            bf_size + k * sizeof (struct GNUNET_PeerIdentity),
+                            GNUNET_MESSAGE_TYPE_FS_GET);
   gm->type = htonl (pr->public_data.type);
   if (do_route)
     prio =
@@ -551,29 +569,24 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
   pr->public_data.respect_offered += prio;
   gm->priority = htonl (prio);
   now = GNUNET_TIME_absolute_get ();
-  ttl = (int64_t) (pr->public_data.ttl.abs_value - now.abs_value);
-  gm->ttl = htonl (ttl / 1000);
+  ttl = (int64_t) (pr->public_data.ttl.abs_value_us - now.abs_value_us);
+  gm->ttl = htonl (ttl / 1000LL / 1000LL);
   gm->filter_mutator = htonl (pr->mingle);
   gm->hash_bitmap = htonl (bm);
   gm->query = pr->public_data.query;
-  ext = (struct GNUNET_HashCode *) & gm[1];
+  ext = (struct GNUNET_PeerIdentity *) &gm[1];
   k = 0;
-  if (!do_route)
+  if (! do_route)
     GNUNET_PEER_resolve (pr->sender_pid,
-                         (struct GNUNET_PeerIdentity *) &ext[k++]);
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
-    memcpy (&ext[k++], pr->public_data.namespace, sizeof (struct GNUNET_HashCode));
+                         &ext[k++]);
   if (NULL != pr->public_data.target)
-    memcpy (&ext[k++],
-           pr->public_data.target,
-           sizeof (struct GNUNET_PeerIdentity));
-  if (pr->bf != NULL)
+    ext[k++] = *pr->public_data.target;
+  if (NULL != pr->bf)
     GNUNET_assert (GNUNET_SYSERR !=
                    GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
                                                               (char *) &ext[k],
                                                               bf_size));
-  memcpy (buf, gm, msize);
-  return msize;
+  return env;
 }
 
 
@@ -583,20 +596,31 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
  * @param cls closure, unused
  * @param key current key code
  * @param value value in the hash map (pending request)
- * @return GNUNET_YES (we should continue to iterate)
+ * @return #GNUNET_YES (we should continue to iterate)
  */
 static int
-clean_request (void *cls, const struct GNUNET_HashCode * key, void *value)
+clean_request (void *cls,
+               const struct GNUNET_HashCode *key,
+               void *value)
 {
   struct GSF_PendingRequest *pr = value;
   GSF_LocalLookupContinuation cont;
 
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-              "Cleaning up pending request for `%s'.\n", GNUNET_h2s (key));
+              "Cleaning up pending request for `%s'.\n",
+             GNUNET_h2s (key));
+  if (NULL != pr->cadet_request)
+  {
+    pr->cadet_retry_count = CADET_RETRY_MAX;
+    GSF_cadet_query_cancel (pr->cadet_request);
+    pr->cadet_request = NULL;
+  }
   if (NULL != (cont = pr->llc_cont))
   {
     pr->llc_cont = NULL;
-    cont (pr->llc_cont_cls, pr, pr->local_result);
+    cont (pr->llc_cont_cls,
+          pr,
+          pr->local_result);
   }
   GSF_plan_notify_request_done_ (pr);
   GNUNET_free_non_null (pr->replies_seen);
@@ -624,17 +648,18 @@ clean_request (void *cls, const struct GNUNET_HashCode * key, void *value)
     GNUNET_DHT_get_stop (pr->gh);
     pr->gh = NULL;
   }
-  if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
+  if (NULL != pr->warn_task)
   {
     GNUNET_SCHEDULER_cancel (pr->warn_task);
-    pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
+    pr->warn_task = NULL;
   }
   GNUNET_assert (GNUNET_OK ==
                  GNUNET_CONTAINER_multihashmap_remove (pr_map,
                                                        &pr->public_data.query,
                                                        pr));
   GNUNET_STATISTICS_update (GSF_stats,
-                            gettext_noop ("# Pending requests active"), -1,
+                            gettext_noop ("# Pending requests active"),
+                            -1,
                             GNUNET_NO);
   GNUNET_free (pr);
   return GNUNET_YES;
@@ -648,22 +673,31 @@ clean_request (void *cls, const struct GNUNET_HashCode * key, void *value)
  * @param full_cleanup fully purge the request
  */
 void
-GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr, int full_cleanup)
+GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr,
+                             int full_cleanup)
 {
   GSF_LocalLookupContinuation cont;
 
   if (NULL == pr_map)
     return;                     /* already cleaned up! */
-  if (GNUNET_YES != full_cleanup)
+  if (GNUNET_NO == full_cleanup)
   {
     /* make request inactive (we're no longer interested in more results),
      * but do NOT remove from our data-structures, we still need it there
      * to prevent the request from looping */
     pr->rh = NULL;
+    if (NULL != pr->cadet_request)
+    {
+      pr->cadet_retry_count = CADET_RETRY_MAX;
+      GSF_cadet_query_cancel (pr->cadet_request);
+      pr->cadet_request = NULL;
+    }
     if (NULL != (cont = pr->llc_cont))
     {
       pr->llc_cont = NULL;
-      cont (pr->llc_cont_cls, pr, pr->local_result);
+      cont (pr->llc_cont_cls,
+            pr,
+            pr->local_result);
     }
     GSF_plan_notify_request_done_ (pr);
     if (NULL != pr->qe)
@@ -676,15 +710,17 @@ GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr, int full_cleanup)
       GNUNET_DHT_get_stop (pr->gh);
       pr->gh = NULL;
     }
-    if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
+    if (NULL != pr->warn_task)
     {
       GNUNET_SCHEDULER_cancel (pr->warn_task);
-      pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
+      pr->warn_task = NULL;
     }
     return;
   }
   GNUNET_assert (GNUNET_YES ==
-                 clean_request (NULL, &pr->public_data.query, pr));
+                 clean_request (NULL,
+                                &pr->public_data.query,
+                                pr));
 }
 
 
@@ -692,7 +728,7 @@ GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr, int full_cleanup)
  * Iterate over all pending requests.
  *
  * @param it function to call for each request
- * @param cls closure for it
+ * @param cls closure for @a it
  */
 void
 GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it, void *cls)
@@ -703,10 +739,8 @@ GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it, void *cls)
 }
 
 
-
-
 /**
- * Closure for "process_reply" function.
+ * Closure for process_reply() function.
  */
 struct ProcessReplyClosure
 {
@@ -735,6 +769,11 @@ struct ProcessReplyClosure
    */
   enum GNUNET_BLOCK_Type type;
 
+  /**
+   * Control flags for evaluation.
+   */
+  enum GNUNET_BLOCK_EvaluationOptions eo;
+
   /**
    * How much was this reply worth to us?
    */
@@ -778,13 +817,15 @@ update_request_performance_data (struct ProcessReplyClosure *prq,
 /**
  * We have received a reply; handle it!
  *
- * @param cls response (struct ProcessReplyClosure)
+ * @param cls response (a `struct ProcessReplyClosure`)
  * @param key our query
  * @param value value in the hash map (info about the query)
- * @return GNUNET_YES (we should continue to iterate)
+ * @return #GNUNET_YES (we should continue to iterate)
  */
 static int
-process_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
+process_reply (void *cls,
+               const struct GNUNET_HashCode *key,
+               void *value)
 {
   struct ProcessReplyClosure *prq = cls;
   struct GSF_PendingRequest *pr = value;
@@ -795,16 +836,21 @@ process_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
     return GNUNET_YES;
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Matched result (type %u) for query `%s' with pending request\n",
-              (unsigned int) prq->type, GNUNET_h2s (key));
+              (unsigned int) prq->type,
+              GNUNET_h2s (key));
   GNUNET_STATISTICS_update (GSF_stats,
                             gettext_noop ("# replies received and matched"), 1,
                             GNUNET_NO);
   prq->eval =
-      GNUNET_BLOCK_evaluate (GSF_block_ctx, prq->type, key, &pr->bf, pr->mingle,
-                             pr->public_data.namespace,
-                             (prq->type ==
-                              GNUNET_BLOCK_TYPE_FS_SBLOCK) ?
-                             sizeof (struct GNUNET_HashCode) : 0, prq->data,
+      GNUNET_BLOCK_evaluate (GSF_block_ctx,
+                             prq->type,
+                             prq->eo,
+                             key,
+                             &pr->bf,
+                             pr->mingle,
+                             NULL,
+                             0,
+                             prq->data,
                              prq->size);
   switch (prq->eval)
   {
@@ -816,12 +862,12 @@ process_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
     update_request_performance_data (prq, pr);
     GNUNET_LOAD_update (GSF_rt_entry_lifetime,
                         GNUNET_TIME_absolute_get_duration (pr->
-                                                           public_data.start_time).rel_value);
+                                                           public_data.start_time).rel_value_us);
     if (GNUNET_YES !=
-       GSF_request_plan_reference_get_last_transmission_ (pr->public_data.pr_head, 
-                                                          prq->sender, 
+       GSF_request_plan_reference_get_last_transmission_ (pr->public_data.pr_head,
+                                                          prq->sender,
                                                           &last_transmission))
-      last_transmission.abs_value = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value;
+      last_transmission.abs_value_us = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
     /* pass on to other peers / local clients */
     pr->rh (pr->rh_cls, prq->eval, pr, prq->anonymity_level, prq->expiration,
             last_transmission, prq->type, prq->data, prq->size);
@@ -853,20 +899,26 @@ process_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
     GNUNET_break (0);
     return GNUNET_YES;
   case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Unsupported block type %u\n"),
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Unsupported block type %u\n"),
                 prq->type);
     return GNUNET_NO;
   }
   /* update bloomfilter */
-  GNUNET_CRYPTO_hash (prq->data, prq->size, &chash);
-  GSF_pending_request_update_ (pr, &chash, 1);
+  GNUNET_CRYPTO_hash (prq->data,
+                      prq->size,
+                      &chash);
+  GSF_pending_request_update_ (pr,
+                               &chash,
+                               1);
   if (NULL == prq->sender)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Found result for query `%s' in local datastore\n",
                 GNUNET_h2s (key));
     GNUNET_STATISTICS_update (GSF_stats,
-                              gettext_noop ("# results found locally"), 1,
+                              gettext_noop ("# results found locally"),
+                              1,
                               GNUNET_NO);
   }
   else
@@ -880,18 +932,24 @@ process_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
   prq->request_found = GNUNET_YES;
   /* finally, pass on to other peer / local client */
   if (! GSF_request_plan_reference_get_last_transmission_ (pr->public_data.pr_head,
-                                                          prq->sender, 
+                                                          prq->sender,
                                                           &last_transmission))
-    last_transmission.abs_value = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value;
-  pr->rh (pr->rh_cls, prq->eval, pr, 
-         prq->anonymity_level, prq->expiration,
-          last_transmission, prq->type, prq->data, prq->size);
+    last_transmission.abs_value_us = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
+  pr->rh (pr->rh_cls,
+          prq->eval,
+          pr,
+         prq->anonymity_level,
+          prq->expiration,
+          last_transmission,
+          prq->type,
+          prq->data,
+          prq->size);
   return GNUNET_YES;
 }
 
 
 /**
- * Context for the 'put_migration_continuation'.
+ * Context for put_migration_continuation().
  */
 struct PutMigrationContext
 {
@@ -907,8 +965,8 @@ struct PutMigrationContext
   struct GNUNET_PeerIdentity origin;
 
   /**
-   * GNUNET_YES if we had a matching request for this block,
-   * GNUNET_NO if not.
+   * #GNUNET_YES if we had a matching request for this block,
+   * #GNUNET_NO if not.
    */
   int requested;
 };
@@ -919,12 +977,12 @@ struct PutMigrationContext
  * operation.
  *
  * @param cls closure
- * @param success GNUNET_SYSERR on failure
+ * @param success #GNUNET_SYSERR on failure
  * @param min_expiration minimum expiration time required for content to be stored
  * @param msg NULL on success, otherwise an error message
  */
 static void
-put_migration_continuation (void *cls, int success, 
+put_migration_continuation (void *cls, int success,
                            struct GNUNET_TIME_Absolute min_expiration,
                            const char *msg)
 {
@@ -937,14 +995,14 @@ put_migration_continuation (void *cls, int success,
   {
     if (GNUNET_SYSERR != success)
     {
-      GNUNET_LOAD_update (datastore_put_load, 
-                         GNUNET_TIME_absolute_get_duration (pmc->start).rel_value);
+      GNUNET_LOAD_update (datastore_put_load,
+                         GNUNET_TIME_absolute_get_duration (pmc->start).rel_value_us);
     }
     else
     {
       /* on queue failure / timeout, increase the put load dramatically */
-      GNUNET_LOAD_update (datastore_put_load, 
-                         GNUNET_TIME_UNIT_MINUTES.rel_value);
+      GNUNET_LOAD_update (datastore_put_load,
+                         GNUNET_TIME_UNIT_MINUTES.rel_value_us);
     }
   }
   cp = GSF_peer_get_ (&pmc->origin);
@@ -953,22 +1011,22 @@ put_migration_continuation (void *cls, int success,
     if (NULL != cp)
     {
       ppd = GSF_get_peer_performance_data_ (cp);
-      ppd->migration_delay.rel_value /= 2;
+      ppd->migration_delay.rel_value_us /= 2;
     }
     GNUNET_free (pmc);
     return;
   }
-  if ( (GNUNET_NO == success) && 
-       (GNUNET_NO == pmc->requested) && 
+  if ( (GNUNET_NO == success) &&
+       (GNUNET_NO == pmc->requested) &&
        (NULL != cp) )
   {
     ppd = GSF_get_peer_performance_data_ (cp);
-    if (min_expiration.abs_value > 0)
+    if (min_expiration.abs_value_us > 0)
     {
-      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Asking to stop migration for %s because datastore is full\n",
                  GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (min_expiration), GNUNET_YES));
-      GSF_block_peer_migration_ (cp, min_expiration);      
+      GSF_block_peer_migration_ (cp, min_expiration);
     }
     else
     {
@@ -976,13 +1034,15 @@ put_migration_continuation (void *cls, int success,
                                                       ppd->migration_delay);
       ppd->migration_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_HOURS,
                                                       ppd->migration_delay);
-      mig_pause.rel_value = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
-                                                     ppd->migration_delay.rel_value);
-      ppd->migration_delay = GNUNET_TIME_relative_multiply (ppd->migration_delay, 2);
-      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 
+      mig_pause.rel_value_us = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
+                                                        ppd->migration_delay.rel_value_us);
+      ppd->migration_delay = GNUNET_TIME_relative_saturating_multiply (ppd->migration_delay, 2);
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Replicated content already exists locally, asking to stop migration for %s\n",
-                 GNUNET_STRINGS_relative_time_to_string (mig_pause, GNUNET_YES));
-      GSF_block_peer_migration_ (cp, GNUNET_TIME_relative_to_absolute (mig_pause));
+                 GNUNET_STRINGS_relative_time_to_string (mig_pause,
+                                                          GNUNET_YES));
+      GSF_block_peer_migration_ (cp,
+                                 GNUNET_TIME_relative_to_absolute (mig_pause));
     }
   }
   GNUNET_free (pmc);
@@ -997,8 +1057,9 @@ put_migration_continuation (void *cls, int success,
  * to even consider processing the query at
  * all.
  *
- * @return GNUNET_YES if the load is too high to do anything (load high)
- *         GNUNET_NO to process normally (load normal or low)
+ * @param priority the priority of the item
+ * @return #GNUNET_YES if the load is too high to do anything (load high)
+ *         #GNUNET_NO to process normally (load normal or low)
  */
 static int
 test_put_load_too_high (uint32_t priority)
@@ -1028,21 +1089,24 @@ test_put_load_too_high (uint32_t priority)
  * @param exp when will this value expire
  * @param key key of the result
  * @param get_path peers on reply path (or NULL if not recorded)
- * @param get_path_length number of entries in get_path
+ * @param get_path_length number of entries in @a get_path
  * @param put_path peers on the PUT path (or NULL if not recorded)
- * @param put_path_length number of entries in get_path
+ * @param put_path_length number of entries in @a get_path
  * @param type type of the result
- * @param size number of bytes in data
+ * @param size number of bytes in @a data
  * @param data pointer to the result data
  */
 static void
-handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
-                  const struct GNUNET_HashCode * key,
+handle_dht_reply (void *cls,
+                  struct GNUNET_TIME_Absolute exp,
+                  const struct GNUNET_HashCode *key,
                   const struct GNUNET_PeerIdentity *get_path,
                   unsigned int get_path_length,
                   const struct GNUNET_PeerIdentity *put_path,
-                  unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
-                  size_t size, const void *data)
+                  unsigned int put_path_length,
+                  enum GNUNET_BLOCK_Type type,
+                  size_t size,
+                  const void *data)
 {
   struct GSF_PendingRequest *pr = cls;
   struct ProcessReplyClosure prq;
@@ -1059,6 +1123,7 @@ handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
                                             prq.expiration);
   prq.size = size;
   prq.type = type;
+  prq.eo = GNUNET_BLOCK_EO_NONE;
   process_reply (&prq, key, pr);
   if ((GNUNET_YES == active_to_migration) &&
       (GNUNET_NO == test_put_load_too_high (prq.priority)))
@@ -1066,7 +1131,7 @@ handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Replicating result for query `%s' with priority %u\n",
                 GNUNET_h2s (key), prq.priority);
-    pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
+    pmc = GNUNET_new (struct PutMigrationContext);
     pmc->start = GNUNET_TIME_absolute_get ();
     pmc->requested = GNUNET_YES;
     if (NULL ==
@@ -1074,10 +1139,12 @@ handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
                               1 /* anonymity */ ,
                               0 /* replication */ ,
                               exp, 1 + prq.priority, MAX_DATASTORE_QUEUE,
-                              GNUNET_CONSTANTS_SERVICE_TIMEOUT,
                               &put_migration_continuation, pmc))
     {
-      put_migration_continuation (pmc, GNUNET_SYSERR, GNUNET_TIME_UNIT_ZERO_ABS, NULL);
+      put_migration_continuation (pmc,
+                                  GNUNET_SYSERR,
+                                  GNUNET_TIME_UNIT_ZERO_ABS,
+                                  NULL);
     }
   }
 }
@@ -1105,26 +1172,20 @@ GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
   }
   xquery = NULL;
   xquery_size = 0;
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
-  {
-    xquery = buf;
-    memcpy (buf, pr->public_data.namespace, sizeof (struct GNUNET_HashCode));
-    xquery_size = sizeof (struct GNUNET_HashCode);
-  }
   if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
   {
     GNUNET_assert (0 != pr->sender_pid);
     GNUNET_PEER_resolve (pr->sender_pid, &pi);
-    memcpy (&buf[xquery_size], &pi, sizeof (struct GNUNET_PeerIdentity));
+    GNUNET_memcpy (&buf[xquery_size], &pi, sizeof (struct GNUNET_PeerIdentity));
     xquery_size += sizeof (struct GNUNET_PeerIdentity);
   }
   pr->gh =
-      GNUNET_DHT_get_start (GSF_dht, 
+      GNUNET_DHT_get_start (GSF_dht,
                             pr->public_data.type, &pr->public_data.query,
-                            5 /* DEFAULT_GET_REPLICATION */ ,
+                            DHT_GET_REPLICATION,
                             GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
                             xquery, xquery_size, &handle_dht_reply, pr);
-  if ( (NULL != pr->gh) && 
+  if ( (NULL != pr->gh) &&
        (0 != pr->replies_seen_count) )
     GNUNET_DHT_get_filter_known_results (pr->gh,
                                         pr->replies_seen_count,
@@ -1132,22 +1193,115 @@ GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
 }
 
 
+/**
+ * Function called with a reply from the cadet.
+ *
+ * @param cls the pending request struct
+ * @param type type of the block, ANY on error
+ * @param expiration expiration time for the block
+ * @param data_size number of bytes in @a data, 0 on error
+ * @param data reply block data, NULL on error
+ */
+static void
+cadet_reply_proc (void *cls,
+                 enum GNUNET_BLOCK_Type type,
+                 struct GNUNET_TIME_Absolute expiration,
+                 size_t data_size,
+                 const void *data)
+{
+  struct GSF_PendingRequest *pr = cls;
+  struct ProcessReplyClosure prq;
+  struct GNUNET_HashCode query;
+
+  pr->cadet_request = NULL;
+  if (GNUNET_BLOCK_TYPE_ANY == type)
+  {
+    GNUNET_break (NULL == data);
+    GNUNET_break (0 == data_size);
+    pr->cadet_retry_count++;
+    if (pr->cadet_retry_count >= CADET_RETRY_MAX)
+      return; /* give up on cadet */
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Error retrieiving block via cadet\n");
+    /* retry -- without delay, as this is non-anonymous
+       and cadet/cadet connect will take some time anyway */
+    pr->cadet_request = GSF_cadet_query (pr->public_data.target,
+                                         &pr->public_data.query,
+                                         pr->public_data.type,
+                                         &cadet_reply_proc,
+                                         pr);
+    return;
+  }
+  if (GNUNET_YES !=
+      GNUNET_BLOCK_get_key (GSF_block_ctx,
+                           type,
+                           data, data_size, &query))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Failed to derive key for block of type %d\n",
+               (int) type);
+    GNUNET_break_op (0);
+    return;
+  }
+  GNUNET_STATISTICS_update (GSF_stats,
+                            gettext_noop ("# Replies received from CADET"), 1,
+                            GNUNET_NO);
+  memset (&prq, 0, sizeof (prq));
+  prq.data = data;
+  prq.expiration = expiration;
+  /* do not allow migrated content to live longer than 1 year */
+  prq.expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_YEARS),
+                                            prq.expiration);
+  prq.size = data_size;
+  prq.type = type;
+  prq.eo = GNUNET_BLOCK_EO_NONE;
+  process_reply (&prq, &query, pr);
+}
+
+
+/**
+ * Consider downloading via cadet (if possible)
+ *
+ * @param pr the pending request to process
+ */
+void
+GSF_cadet_lookup_ (struct GSF_PendingRequest *pr)
+{
+  if (0 != pr->public_data.anonymity_level)
+    return;
+  if (0 == pr->public_data.target)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Cannot do cadet-based download, target peer not known\n");
+    return;
+  }
+  if (NULL != pr->cadet_request)
+    return;
+  pr->cadet_request = GSF_cadet_query (pr->public_data.target,
+                                       &pr->public_data.query,
+                                       pr->public_data.type,
+                                       &cadet_reply_proc,
+                                       pr);
+}
+
+
 /**
  * Task that issues a warning if the datastore lookup takes too long.
  *
- * @param cls the 'struct GSF_PendingRequest'
- * @param tc task context
+ * @param cls the `struct GSF_PendingRequest`
  */
 static void
-warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+warn_delay_task (void *cls)
 {
   struct GSF_PendingRequest *pr = cls;
 
-  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+  GNUNET_log (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
               _("Datastore lookup already took %s!\n"),
-              GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (pr->qe_start), GNUNET_YES));
+              GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (pr->qe_start),
+                                                      GNUNET_YES));
   pr->warn_task =
-      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
+      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
+                                    &warn_delay_task,
                                     pr);
 }
 
@@ -1155,11 +1309,10 @@ warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 /**
  * Task that issues a warning if the datastore lookup takes too long.
  *
- * @param cls the 'struct GSF_PendingRequest'
- * @param tc task context
+ * @param cls the `struct GSF_PendingRequest`
  */
 static void
-odc_warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+odc_warn_delay_task (void *cls)
 {
   struct GSF_PendingRequest *pr = cls;
 
@@ -1178,9 +1331,9 @@ odc_warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  * peer and if we are done either clean up (operation
  * complete) or forward to other peers (more results possible).
  *
- * @param cls our closure (struct PendingRequest)
+ * @param cls our closure (`struct GSF_PendingRequest *`)
  * @param key key for the content
- * @param size number of bytes in data
+ * @param size number of bytes in @a data
  * @param data content stored
  * @param type type of the content
  * @param priority priority of the content
@@ -1190,10 +1343,15 @@ odc_warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  *        maybe 0 if no unique identifier is available
  */
 static void
-process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
-                     const void *data, enum GNUNET_BLOCK_Type type,
-                     uint32_t priority, uint32_t anonymity,
-                     struct GNUNET_TIME_Absolute expiration, uint64_t uid)
+process_local_reply (void *cls,
+                     const struct GNUNET_HashCode *key,
+                     size_t size,
+                     const void *data,
+                     enum GNUNET_BLOCK_Type type,
+                     uint32_t priority,
+                     uint32_t anonymity,
+                     struct GNUNET_TIME_Absolute expiration,
+                     uint64_t uid)
 {
   struct GSF_PendingRequest *pr = cls;
   GSF_LocalLookupContinuation cont;
@@ -1202,7 +1360,7 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
   unsigned int old_rf;
 
   GNUNET_SCHEDULER_cancel (pr->warn_task);
-  pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
+  pr->warn_task = NULL;
   if (NULL != pr->qe)
   {
     pr->qe = NULL;
@@ -1303,7 +1461,6 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
                                     pr->public_data.options)) ? UINT_MAX :
                                   GSF_datastore_queue_size
                                   /* max queue size */ ,
-                                  GNUNET_TIME_UNIT_FOREVER_REL,
                                   &process_local_reply, pr);
     if (NULL != pr->qe)
       return;                   /* we're done */
@@ -1323,7 +1480,7 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
   {
     GNUNET_break (0);
     GNUNET_DATASTORE_remove (GSF_dsh, key, size, data, -1, -1,
-                             GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
+                             NULL, NULL);
     pr->qe_start = GNUNET_TIME_absolute_get ();
     pr->warn_task =
         GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
@@ -1343,9 +1500,8 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
                                     pr->public_data.options)) ? UINT_MAX :
                                   GSF_datastore_queue_size
                                   /* max queue size */ ,
-                                  GNUNET_TIME_UNIT_FOREVER_REL,
                                   &process_local_reply, pr);
-    if (pr->qe == NULL)
+    if (NULL == pr->qe)
     {
       GNUNET_STATISTICS_update (GSF_stats,
                                 gettext_noop
@@ -1359,8 +1515,9 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
   prq.priority = priority;
   prq.request_found = GNUNET_NO;
   prq.anonymity_level = anonymity;
-  if ((old_rf == 0) && (pr->public_data.results_found == 0))
+  if ((0 == old_rf) && (0 == pr->public_data.results_found))
     GSF_update_datastore_delay_ (pr->public_data.start_time);
+  prq.eo = GNUNET_BLOCK_EO_LOCAL_SKIP_CRYPTO;
   process_reply (&prq, key, pr);
   pr->local_result = prq.eval;
   if (prq.eval == GNUNET_BLOCK_EVALUATION_OK_LAST)
@@ -1368,23 +1525,26 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# Datastore lookups concluded (found last result)"),
-                              1, GNUNET_NO);
+                              1,
+                              GNUNET_NO);
     goto check_error_and_continue;
   }
   if ((0 == (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options)) &&
       ((GNUNET_YES == GSF_test_get_load_too_high_ (0)) ||
        (pr->public_data.results_found > 5 + 2 * pr->public_data.priority)))
   {
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Load too high, done with request\n");
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Load too high, done with request\n");
     GNUNET_STATISTICS_update (GSF_stats,
-                              gettext_noop
-                              ("# Datastore lookups concluded (load too high)"),
-                              1, GNUNET_NO);
+                              gettext_noop ("# Datastore lookups concluded (load too high)"),
+                              1,
+                              GNUNET_NO);
     goto check_error_and_continue;
   }
   pr->qe_start = GNUNET_TIME_absolute_get ();
   pr->warn_task =
-      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
+      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
+                                    &warn_delay_task,
                                     pr);
   pr->qe =
       GNUNET_DATASTORE_get_key (GSF_dsh, pr->local_result_offset++,
@@ -1401,7 +1561,6 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
                                   public_data.options)) ? UINT_MAX :
                                 GSF_datastore_queue_size
                                 /* max queue size */ ,
-                                GNUNET_TIME_UNIT_FOREVER_REL,
                                 &process_local_reply, pr);
   /* check if we successfully queued another datastore request;
    * if so, return, otherwise call our continuation (if we have
@@ -1409,14 +1568,36 @@ process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
 check_error_and_continue:
   if (NULL != pr->qe)
     return;
-  if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
+  if (NULL != pr->warn_task)
   {
     GNUNET_SCHEDULER_cancel (pr->warn_task);
-    pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
+    pr->warn_task = NULL;
   }
   if (NULL == (cont = pr->llc_cont))
     return;                     /* no continuation */
   pr->llc_cont = NULL;
+  if (0 != (GSF_PRO_LOCAL_ONLY & pr->public_data.options))
+  {
+    if (GNUNET_BLOCK_EVALUATION_OK_LAST != pr->local_result)
+    {
+      /* Signal that we are done and that there won't be any
+         additional results to allow client to clean up state. */
+      pr->rh (pr->rh_cls,
+               GNUNET_BLOCK_EVALUATION_OK_LAST,
+               pr,
+               UINT32_MAX,
+               GNUNET_TIME_UNIT_ZERO_ABS,
+               GNUNET_TIME_UNIT_FOREVER_ABS,
+               GNUNET_BLOCK_TYPE_ANY,
+               NULL, 0);
+    }
+    /* Finally, call our continuation to signal that we are
+       done with local processing of this request; i.e. to
+       start reading again from the client. */
+    cont (pr->llc_cont_cls, NULL, GNUNET_BLOCK_EVALUATION_OK_LAST);
+    return;
+  }
+
   cont (pr->llc_cont_cls, pr, pr->local_result);
 }
 
@@ -1426,7 +1607,7 @@ check_error_and_continue:
  *
  * @param pr request
  * @param target
- * @return GNUNET_YES if this request could be forwarded to the given peer
+ * @return #GNUNET_YES if this request could be forwarded to the given peer
  */
 int
 GSF_pending_request_test_target_ (struct GSF_PendingRequest *pr,
@@ -1449,19 +1630,22 @@ GSF_pending_request_test_target_ (struct GSF_PendingRequest *pr,
  *
  * @param pr the pending request to process
  * @param cont function to call at the end
- * @param cont_cls closure for cont
+ * @param cont_cls closure for @a cont
  */
 void
 GSF_local_lookup_ (struct GSF_PendingRequest *pr,
-                   GSF_LocalLookupContinuation cont, void *cont_cls)
+                   GSF_LocalLookupContinuation cont,
+                   void *cont_cls)
 {
   GNUNET_assert (NULL == pr->gh);
+  GNUNET_assert (NULL == pr->cadet_request);
   GNUNET_assert (NULL == pr->llc_cont);
   pr->llc_cont = cont;
   pr->llc_cont_cls = cont_cls;
   pr->qe_start = GNUNET_TIME_absolute_get ();
   pr->warn_task =
-      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
+      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
+                                    &warn_delay_task,
                                     pr);
 #if INSANE_STATISTICS
   GNUNET_STATISTICS_update (GSF_stats,
@@ -1483,7 +1667,6 @@ GSF_local_lookup_ (struct GSF_PendingRequest *pr,
                                   public_data.options)) ? UINT_MAX :
                                 GSF_datastore_queue_size
                                 /* max queue size */ ,
-                                GNUNET_TIME_UNIT_FOREVER_REL,
                                 &process_local_reply, pr);
   if (NULL != pr->qe)
     return;
@@ -1492,7 +1675,7 @@ GSF_local_lookup_ (struct GSF_PendingRequest *pr,
                             ("# Datastore lookups concluded (error queueing)"),
                             1, GNUNET_NO);
   GNUNET_SCHEDULER_cancel (pr->warn_task);
-  pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
+  pr->warn_task = NULL;
   pr->llc_cont = NULL;
   if (NULL != cont)
     cont (cont_cls, pr, pr->local_result);
@@ -1506,18 +1689,14 @@ GSF_local_lookup_ (struct GSF_PendingRequest *pr,
  * this content and possibly passes it on (to local clients or other
  * peers).  Does NOT perform migration (content caching at this peer).
  *
- * @param cp the other peer involved (sender or receiver, NULL
- *        for loopback messages where we are both sender and receiver)
- * @param message the actual message
- * @return GNUNET_OK if the message was well-formed,
- *         GNUNET_SYSERR if the message was malformed (close connection,
- *         do not cache under any circumstances)
+ * @param cls the other peer involved
+ * @param put the actual message
  */
-int
-GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
-                         const struct GNUNET_MessageHeader *message)
+void
+handle_p2p_put (void *cls,
+               const struct PutMessage *put)
 {
-  const struct PutMessage *put;
+  struct GSF_ConnectedPeer *cp = cls;
   uint16_t msize;
   size_t dsize;
   enum GNUNET_BLOCK_Type type;
@@ -1528,29 +1707,30 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
   double putl;
   struct PutMigrationContext *pmc;
 
-  msize = ntohs (message->size);
-  if (msize < sizeof (struct PutMessage))
-  {
-    GNUNET_break_op (0);
-    return GNUNET_SYSERR;
-  }
-  put = (const struct PutMessage *) message;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received P2P PUT from %s\n",
+              GNUNET_i2s (GSF_get_peer_performance_data_ (cp)->peer));
+  GSF_cover_content_count++;
+  msize = ntohs (put->header.size);
   dsize = msize - sizeof (struct PutMessage);
   type = ntohl (put->type);
   expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
   /* do not allow migrated content to live longer than 1 year */
   expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_YEARS),
                                         expiration);
-  if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
-    return GNUNET_SYSERR;
   if (GNUNET_OK !=
-      GNUNET_BLOCK_get_key (GSF_block_ctx, type, &put[1], dsize, &query))
+      GNUNET_BLOCK_get_key (GSF_block_ctx,
+                            type,
+                            &put[1],
+                            dsize,
+                            &query))
   {
     GNUNET_break_op (0);
-    return GNUNET_SYSERR;
+    return;
   }
   GNUNET_STATISTICS_update (GSF_stats,
-                            gettext_noop ("# GAP PUT messages received"), 1,
+                            gettext_noop ("# GAP PUT messages received"),
+                            1,
                             GNUNET_NO);
   /* now, lookup 'query' */
   prq.data = (const void *) &put[1];
@@ -1561,7 +1741,10 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
   prq.priority = 0;
   prq.anonymity_level = UINT32_MAX;
   prq.request_found = GNUNET_NO;
-  GNUNET_CONTAINER_multihashmap_get_multiple (pr_map, &query, &process_reply,
+  prq.eo = GNUNET_BLOCK_EO_NONE;
+  GNUNET_CONTAINER_multihashmap_get_multiple (pr_map,
+                                              &query,
+                                              &process_reply,
                                               &prq);
   if (NULL != cp)
   {
@@ -1576,33 +1759,45 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Replicating result for query `%s' with priority %u\n",
-                GNUNET_h2s (&query), prq.priority);
-    pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
+                GNUNET_h2s (&query),
+                prq.priority);
+    pmc = GNUNET_new (struct PutMigrationContext);
     pmc->start = GNUNET_TIME_absolute_get ();
     pmc->requested = prq.request_found;
     GNUNET_assert (0 != GSF_get_peer_performance_data_ (cp)->pid);
     GNUNET_PEER_resolve (GSF_get_peer_performance_data_ (cp)->pid,
                          &pmc->origin);
     if (NULL ==
-        GNUNET_DATASTORE_put (GSF_dsh, 0, &query, dsize, &put[1], type,
-                              prq.priority, 1 /* anonymity */ ,
+        GNUNET_DATASTORE_put (GSF_dsh,
+                             0,
+                             &query,
+                             dsize,
+                             &put[1],
+                             type,
+                              prq.priority,
+                             1 /* anonymity */ ,
                               0 /* replication */ ,
-                              expiration, 1 + prq.priority, MAX_DATASTORE_QUEUE,
-                              GNUNET_CONSTANTS_SERVICE_TIMEOUT,
-                              &put_migration_continuation, pmc))
+                              expiration, 1 + prq.priority,
+                             MAX_DATASTORE_QUEUE,
+                              &put_migration_continuation,
+                             pmc))
     {
-      put_migration_continuation (pmc, GNUNET_SYSERR, GNUNET_TIME_UNIT_ZERO_ABS, NULL);
+      put_migration_continuation (pmc,
+                                  GNUNET_SYSERR,
+                                  GNUNET_TIME_UNIT_ZERO_ABS,
+                                  NULL);
     }
   }
   else if (NULL != cp)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Choosing not to keep content `%s' (%d/%d)\n",
-                GNUNET_h2s (&query), active_to_migration,
+                GNUNET_h2s (&query),
+               active_to_migration,
                 test_put_load_too_high (prq.priority));
   }
   putl = GNUNET_LOAD_get_load (datastore_put_load);
-  if ( (NULL != cp) && 
+  if ( (NULL != cp) &&
        (GNUNET_NO == prq.request_found) &&
        ( (GNUNET_YES != active_to_migration) ||
         (putl > 2.5 * (1 + prq.priority)) ) )
@@ -1615,15 +1810,29 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
                                        GNUNET_CRYPTO_random_u32
                                        (GNUNET_CRYPTO_QUALITY_WEAK,
                                         (unsigned int) (60000 * putl * putl)));
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 
-               "Asking to stop migration for %llu ms because of load %f and events %d/%d\n",
-               (unsigned long long) block_time.rel_value,
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Asking to stop migration for %s because of load %f and events %d/%d\n",
+               GNUNET_STRINGS_relative_time_to_string (block_time,
+                                                       GNUNET_YES),
                putl,
                active_to_migration,
                (GNUNET_NO == prq.request_found));
-    GSF_block_peer_migration_ (cp, GNUNET_TIME_relative_to_absolute (block_time));
+    GSF_block_peer_migration_ (cp,
+                              GNUNET_TIME_relative_to_absolute (block_time));
   }
-  return GNUNET_OK;
+}
+
+
+/**
+ * Check if the given request is still active.
+ *
+ * @param pr pending request
+ * @return #GNUNET_YES if the request is still active
+ */
+int
+GSF_pending_request_test_active_ (struct GSF_PendingRequest *pr)
+{
+  return (NULL != pr->rh) ? GNUNET_YES : GNUNET_NO;
 }
 
 
@@ -1656,7 +1865,9 @@ GSF_pending_request_init_ ()
 void
 GSF_pending_request_done_ ()
 {
-  GNUNET_CONTAINER_multihashmap_iterate (pr_map, &clean_request, NULL);
+  GNUNET_CONTAINER_multihashmap_iterate (pr_map,
+                                         &clean_request,
+                                         NULL);
   GNUNET_CONTAINER_multihashmap_destroy (pr_map);
   pr_map = NULL;
   GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);