more size checking; tokenize only after size check
[oweals/gnunet.git] / src / social / social_api.c
index 3d5e9853ff3bae7e5fca08d386bf054bf2d12713..89843831be02164972b6c04c6877066d88156391 100644 (file)
@@ -1,6 +1,6 @@
 /*
  * This file is part of GNUnet
- * Copyright (C) 2013 Christian Grothoff (and other contributing authors)
+ * Copyright (C) 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
  */
 
 /**
- * @file social/social_api.c
- * @brief Social service; implements social interactions using the PSYC service.
  * @author Gabor X Toth
+ *
+ * @file
+ * Social service; implements social interactions using the PSYC service.
  */
 
 #include <inttypes.h>
@@ -29,7 +30,6 @@
 
 #include "platform.h"
 #include "gnunet_util_lib.h"
-#include "gnunet_env_lib.h"
 #include "gnunet_psyc_service.h"
 #include "gnunet_psyc_util_lib.h"
 #include "gnunet_social_service.h"
@@ -71,12 +71,27 @@ struct GNUNET_SOCIAL_App
   /**
    * Client connection to the service.
    */
-  struct GNUNET_CLIENT_MANAGER_Connection *client;
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * Message to send on connect.
+   */
+  struct GNUNET_MQ_Envelope *connect_env;
+
+  /**
+   * Time to wait until we try to reconnect on failure.
+   */
+  struct GNUNET_TIME_Relative reconnect_delay;
 
   /**
-   * Message to send on reconnect.
+   * Task for reconnecting when the listener fails.
    */
-  struct GNUNET_MessageHeader *connect_msg;
+  struct GNUNET_SCHEDULER_Task *reconnect_task;
+
+  /**
+   * Async operations.
+   */
+  struct GNUNET_OP_Handle *op;
 
   /**
    * Function called after disconnected from the service.
@@ -102,13 +117,8 @@ struct GNUNET_SOCIAL_App
   GNUNET_SOCIAL_AppEgoCallback ego_cb;
   GNUNET_SOCIAL_AppHostPlaceCallback host_cb;
   GNUNET_SOCIAL_AppGuestPlaceCallback guest_cb;
+  GNUNET_SOCIAL_AppConnectedCallback connected_cb;
   void *cb_cls;
-
-  /**
-   * Is this place in the process of disconnecting from the service?
-   * #GNUNET_YES or #GNUNET_NO
-   */
-  uint8_t is_disconnecting;
 };
 
 
@@ -141,28 +151,39 @@ struct GNUNET_SOCIAL_Place
   /**
    * Client connection to the service.
    */
-  struct GNUNET_CLIENT_MANAGER_Connection *client;
+  struct GNUNET_MQ_Handle *mq;
 
   /**
-   * Transmission handle.
+   * Message to send on connect.
    */
-  struct GNUNET_PSYC_TransmitHandle *tmit;
+  struct GNUNET_MQ_Envelope *connect_env;
 
   /**
-   * Receipt handle.
+   * Time to wait until we try to reconnect on failure.
    */
-  struct GNUNET_PSYC_ReceiveHandle *recv;
+  struct GNUNET_TIME_Relative reconnect_delay;
 
   /**
-   * Slicer for processing incoming methods.
+   * Task for reconnecting when the listener fails.
    */
-  struct GNUNET_SOCIAL_Slicer *slicer;
+  struct GNUNET_SCHEDULER_Task *reconnect_task;
 
   /**
-   * Message to send on reconnect.
+   * Async operations.
    */
-  struct GNUNET_MessageHeader *connect_msg;
+  struct GNUNET_OP_Handle *op;
 
+  /**
+   * Transmission handle.
+   */
+  struct GNUNET_PSYC_TransmitHandle *tmit;
+
+  /**
+   * Slicer for processing incoming messages.
+   */
+  struct GNUNET_PSYC_Slicer *slicer;
+
+  // FIXME: do we need is_disconnecing like on the psyc and multicast APIs?
   /**
    * Function called after disconnected from the service.
    */
@@ -187,12 +208,6 @@ struct GNUNET_SOCIAL_Place
    * Does this place belong to a host (#GNUNET_YES) or guest (#GNUNET_NO)?
    */
   uint8_t is_host;
-
-  /**
-   * Is this place in the process of disconnecting from the service?
-   * #GNUNET_YES or #GNUNET_NO
-   */
-  uint8_t is_disconnecting;
 };
 
 
@@ -204,14 +219,9 @@ struct GNUNET_SOCIAL_Host
   struct GNUNET_SOCIAL_Place plc;
 
   /**
-   * Receipt handle.
-   */
-  struct GNUNET_PSYC_ReceiveHandle *recv;
-
-  /**
-   * Slicer for processing incoming methods.
+   * Slicer for processing incoming messages from guests.
    */
-  struct GNUNET_SOCIAL_Slicer *slicer;
+  struct GNUNET_PSYC_Slicer *slicer;
 
   GNUNET_SOCIAL_HostEnterCallback enter_cb;
 
@@ -225,7 +235,7 @@ struct GNUNET_SOCIAL_Host
   void *cb_cls;
 
   struct GNUNET_SOCIAL_Nym *notice_place_leave_nym;
-  struct GNUNET_ENV_Environment *notice_place_leave_env;
+  struct GNUNET_PSYC_Environment *notice_place_leave_env;
 };
 
 
@@ -236,16 +246,6 @@ struct GNUNET_SOCIAL_Guest
 {
   struct GNUNET_SOCIAL_Place plc;
 
-  /**
-   * Receipt handle.
-   */
-  struct GNUNET_PSYC_ReceiveHandle *recv;
-
-  /**
-   * Slicer for processing incoming methods.
-   */
-  struct GNUNET_SOCIAL_Slicer *slicer;
-
   GNUNET_SOCIAL_GuestEnterCallback enter_cb;
 
   GNUNET_SOCIAL_EntryDecisionCallback entry_dcsn_cb;
@@ -264,120 +264,6 @@ struct GNUNET_SOCIAL_Guest
 struct GNUNET_CONTAINER_MultiHashMap *nyms;
 
 
-/**
- * Handle for a try-and-slice instance.
- */
-struct GNUNET_SOCIAL_Slicer
-{
-  /**
-   * Method handlers: method_name -> SlicerMethodCallbacks
-   */
-  struct GNUNET_CONTAINER_MultiHashMap *method_handlers;
-
-  /**
-   * Modifier handlers: modifier name -> SlicerModifierCallbacks
-   */
-  struct GNUNET_CONTAINER_MultiHashMap *modifier_handlers;
-
-  /**
-   * Currently being processed message part.
-   */
-  const struct GNUNET_MessageHeader *msg;
-
-  /**
-   * ID of currently being received message.
-   */
-  uint64_t message_id;
-
-  /**
-   * Method name of currently being received message.
-   */
-  char *method_name;
-
-  /**
-   * Name of currently processed modifier.
-   */
-  char *mod_name;
-
-  /**
-   * Value of currently processed modifier.
-   */
-  char *mod_value;
-
-  /**
-   * Public key of the nym the current message originates from.
-   */
-  struct GNUNET_CRYPTO_EcdsaPublicKey nym_key;
-
-  /**
-   * Size of @a method_name (including terminating \0).
-   */
-  uint16_t method_name_size;
-
-  /**
-   * Size of @a modifier_name (including terminating \0).
-   */
-  uint16_t mod_name_size;
-
-  /**
-   * Size of modifier value fragment.
-   */
-  uint16_t mod_value_size;
-
-  /**
-   * Full size of modifier value.
-   */
-  uint16_t mod_full_value_size;
-
-  /**
-   * Remaining bytes from the value of the current modifier.
-   */
-  uint16_t mod_value_remaining;
-
-  /**
-   * Operator of currently processed modifier.
-   */
-  uint8_t mod_oper;
-};
-
-
-/**
- * Callbacks for a slicer method handler.
- */
-struct SlicerMethodCallbacks
-{
-  GNUNET_SOCIAL_MethodCallback method_cb;
-  GNUNET_SOCIAL_ModifierCallback modifier_cb;
-  GNUNET_SOCIAL_DataCallback data_cb;
-  GNUNET_SOCIAL_EndOfMessageCallback eom_cb;
-  void *cls;
-};
-
-
-struct SlicerMethodRemoveClosure
-{
-  struct GNUNET_SOCIAL_Slicer *slicer;
-  struct SlicerMethodCallbacks rm_cbs;
-};
-
-
-/**
- * Callbacks for a slicer method handler.
- */
-struct SlicerModifierCallbacks
-{
-  GNUNET_SOCIAL_ModifierCallback modifier_cb;
-  void *cls;
-};
-
-
-struct SlicerModifierRemoveClosure
-{
-  struct GNUNET_SOCIAL_Slicer *slicer;
-  struct SlicerModifierCallbacks rm_cbs;
-};
-
-
 /**
  * Handle for an announcement request.
  */
@@ -412,9 +298,9 @@ struct GNUNET_SOCIAL_HistoryRequest
   uint64_t op_id;
 
   /**
-   * Message handler.
+   * Slicer for processing incoming messages.
    */
-  struct GNUNET_PSYC_ReceiveHandle *recv;
+  struct GNUNET_PSYC_Slicer *slicer;
 
   /**
    * Function to call when the operation finished.
@@ -474,7 +360,6 @@ struct GNUNET_SOCIAL_LookHandle
 
 struct ZoneAddPlaceHandle
 {
-  struct ZoneAddPlaceRequest *req;
   GNUNET_ResultCallback result_cb;
   void *result_cls;
 };
@@ -482,12 +367,73 @@ struct ZoneAddPlaceHandle
 
 struct ZoneAddNymHandle
 {
-  struct ZoneAddNymRequest *req;
   GNUNET_ResultCallback result_cb;
   void *result_cls;
 };
 
 
+/*** CLEANUP / DISCONNECT ***/
+
+
+static void
+host_cleanup (struct GNUNET_SOCIAL_Host *hst)
+{
+  if (NULL != hst->slicer)
+  {
+    GNUNET_PSYC_slicer_destroy (hst->slicer);
+    hst->slicer = NULL;
+  }
+  GNUNET_free (hst);
+}
+
+
+static void
+guest_cleanup (struct GNUNET_SOCIAL_Guest *gst)
+{
+  GNUNET_free (gst);
+}
+
+
+static void
+place_cleanup (struct GNUNET_SOCIAL_Place *plc)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "cleaning up place %p\n",
+              plc);
+  if (NULL != plc->tmit)
+  {
+    GNUNET_PSYC_transmit_destroy (plc->tmit);
+    plc->tmit = NULL;
+  }
+  if (NULL != plc->connect_env)
+  {
+    GNUNET_MQ_discard (plc->connect_env);
+    plc->connect_env = NULL;
+  }
+  if (NULL != plc->mq)
+  {
+    GNUNET_MQ_destroy (plc->mq);
+    plc->mq = NULL;
+  }
+  if (NULL != plc->disconnect_cb)
+  {
+    plc->disconnect_cb (plc->disconnect_cls);
+    plc->disconnect_cb = NULL;
+  }
+
+  (GNUNET_YES == plc->is_host)
+    ? host_cleanup ((struct GNUNET_SOCIAL_Host *) plc)
+    : guest_cleanup ((struct GNUNET_SOCIAL_Guest *) plc);
+}
+
+
+static void
+place_disconnect (struct GNUNET_SOCIAL_Place *plc)
+{
+  place_cleanup (plc);
+}
+
+
 /*** NYM ***/
 
 static struct GNUNET_SOCIAL_Nym *
@@ -532,36 +478,40 @@ nym_destroy (struct GNUNET_SOCIAL_Nym *nym)
 
 static void
 host_recv_notice_place_leave_method (void *cls,
+                                     const struct GNUNET_PSYC_MessageHeader *msg,
                                      const struct GNUNET_PSYC_MessageMethod *meth,
                                      uint64_t message_id,
-                                     uint32_t flags,
-                                     const struct GNUNET_SOCIAL_Nym *nym,
                                      const char *method_name)
 {
   struct GNUNET_SOCIAL_Host *hst = cls;
+
   if (0 == memcmp (&(struct GNUNET_CRYPTO_EcdsaPublicKey) {},
-                   &nym->pub_key, sizeof (nym->pub_key)))
+                   &msg->slave_pub_key, sizeof (msg->slave_pub_key)))
     return;
 
-  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+  struct GNUNET_SOCIAL_Nym *nym = nym_get_or_create (&msg->slave_pub_key);
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Host received method for message ID %" PRIu64 " from nym %s: %s\n",
               message_id, GNUNET_h2s (&nym->pub_key_hash), method_name);
 
   hst->notice_place_leave_nym = (struct GNUNET_SOCIAL_Nym *) nym;
-  hst->notice_place_leave_env = GNUNET_ENV_environment_create ();
+  hst->notice_place_leave_env = GNUNET_PSYC_env_create ();
 
   char *str = GNUNET_CRYPTO_ecdsa_public_key_to_string (&hst->notice_place_leave_nym->pub_key);
-  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "_notice_place_leave: got method from nym %s (%s).\n",
               GNUNET_h2s (&hst->notice_place_leave_nym->pub_key_hash), str);
+  GNUNET_free (str);
 }
 
 
 static void
 host_recv_notice_place_leave_modifier (void *cls,
-                                       const struct GNUNET_MessageHeader *msg,
+                                       const struct GNUNET_PSYC_MessageHeader *msg,
+                                       const struct GNUNET_MessageHeader *pmsg,
                                        uint64_t message_id,
-                                       enum GNUNET_ENV_Operator oper,
+                                       enum GNUNET_PSYC_Operator oper,
                                        const char *name,
                                        const void *value,
                                        uint16_t value_size,
@@ -571,619 +521,117 @@ host_recv_notice_place_leave_modifier (void *cls,
   if (NULL == hst->notice_place_leave_env)
     return;
 
-  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Host received modifier for _notice_place_leave message with ID %" PRIu64 ":\n"
               "%c%s: %.*s\n",
-              message_id, oper, name, value_size, value);
+              message_id, oper, name, value_size, (const char *) value);
 
   /* skip _nym, it's added later in eom() */
   if (0 == memcmp (name, "_nym", sizeof ("_nym"))
       || 0 == memcmp (name, "_nym_", sizeof ("_nym_") - 1))
     return;
 
-  GNUNET_ENV_environment_add (hst->notice_place_leave_env,
-                              GNUNET_ENV_OP_SET, name, value, value_size);
+  GNUNET_PSYC_env_add (hst->notice_place_leave_env,
+                       GNUNET_PSYC_OP_SET, name, value, value_size);
 }
 
 
 static void
 host_recv_notice_place_leave_eom (void *cls,
-                                  const struct GNUNET_MessageHeader *msg,
+                                  const struct GNUNET_PSYC_MessageHeader *msg,
+                                  const struct GNUNET_MessageHeader *pmsg,
                                   uint64_t message_id,
-                                  uint8_t cancelled)
+                                  uint8_t is_cancelled)
 {
   struct GNUNET_SOCIAL_Host *hst = cls;
   if (NULL == hst->notice_place_leave_env)
     return;
 
   char *str = GNUNET_CRYPTO_ecdsa_public_key_to_string (&hst->notice_place_leave_nym->pub_key);
-  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "_notice_place_leave: got EOM from nym %s (%s).\n",
               GNUNET_h2s (&hst->notice_place_leave_nym->pub_key_hash), str);
+  GNUNET_free (str);
 
-  if (GNUNET_YES != cancelled)
+  if (GNUNET_YES != is_cancelled)
   {
     if (NULL != hst->farewell_cb)
       hst->farewell_cb (hst->cb_cls, hst->notice_place_leave_nym,
                         hst->notice_place_leave_env);
     /* announce leaving guest to place */
-    GNUNET_ENV_environment_add (hst->notice_place_leave_env, GNUNET_ENV_OP_SET,
-                                "_nym", hst->notice_place_leave_nym,
-                                sizeof (*hst->notice_place_leave_nym));
+    GNUNET_PSYC_env_add (hst->notice_place_leave_env, GNUNET_PSYC_OP_SET,
+                         "_nym", hst->notice_place_leave_nym,
+                         sizeof (*hst->notice_place_leave_nym));
     GNUNET_SOCIAL_host_announce (hst, "_notice_place_leave",
                                  hst->notice_place_leave_env,
                                  NULL, NULL, GNUNET_SOCIAL_ANNOUNCE_NONE);
     nym_destroy (hst->notice_place_leave_nym);
   }
-  GNUNET_ENV_environment_destroy (hst->notice_place_leave_env);
+  GNUNET_PSYC_env_destroy (hst->notice_place_leave_env);
   hst->notice_place_leave_env = NULL;
 }
 
 
-/*** SLICER ***/
-
-/**
- * Call a method handler for an incoming message part.
- */
-int
-slicer_method_handler_notify (void *cls, const struct GNUNET_HashCode *key,
-                              void *value)
-{
-  struct GNUNET_SOCIAL_Slicer *slicer = cls;
-  const struct GNUNET_MessageHeader *msg = slicer->msg;
-  struct SlicerMethodCallbacks *cbs = value;
-  uint16_t ptype = ntohs (msg->type);
-
-  switch (ptype)
-  {
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_METHOD:
-  {
-    if (NULL == cbs->method_cb)
-      break;
-    struct GNUNET_PSYC_MessageMethod *
-      meth = (struct GNUNET_PSYC_MessageMethod *) msg;
-    cbs->method_cb (cbs->cls, meth, slicer->message_id,
-                    ntohl (meth->flags),
-                    nym_get_or_create (&slicer->nym_key),
-                    slicer->method_name);
-    break;
-  }
-
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MODIFIER:
-  {
-    if (NULL == cbs->modifier_cb)
-      break;
-    struct GNUNET_PSYC_MessageModifier *
-      mod = (struct GNUNET_PSYC_MessageModifier *) msg;
-    cbs->modifier_cb (cbs->cls, &mod->header, slicer->message_id,
-                      mod->oper, (const char *) &mod[1],
-                      (const void *) &mod[1] + ntohs (mod->name_size),
-                      ntohs (mod->header.size) - sizeof (*mod) - ntohs (mod->name_size),
-                      ntohs (mod->value_size));
-    break;
-  }
-
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MOD_CONT:
-  {
-    if (NULL == cbs->modifier_cb)
-      break;
-    cbs->modifier_cb (cbs->cls, msg, slicer->message_id,
-                      slicer->mod_oper, slicer->mod_name, &msg[1],
-                      ntohs (msg->size) - sizeof (*msg),
-                      slicer->mod_full_value_size);
-    break;
-  }
-
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_DATA:
-  {
-    if (NULL == cbs->data_cb)
-      break;
-    uint64_t data_offset = 0; // FIXME
-    cbs->data_cb (cbs->cls, msg, slicer->message_id,
-                  data_offset, &msg[1], ntohs (msg->size) - sizeof (*msg));
-    break;
-  }
-
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_END:
-    if (NULL == cbs->eom_cb)
-      break;
-    cbs->eom_cb (cbs->cls, msg, slicer->message_id, GNUNET_NO);
-    break;
-
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_CANCEL:
-    if (NULL == cbs->eom_cb)
-      break;
-    cbs->eom_cb (cbs->cls, msg, slicer->message_id, GNUNET_YES);
-    break;
-  }
-  return GNUNET_YES;
-}
-
-
-/**
- * Call a method handler for an incoming message part.
- */
-int
-slicer_modifier_handler_notify (void *cls, const struct GNUNET_HashCode *key,
-                                void *value)
-{
-  struct GNUNET_SOCIAL_Slicer *slicer = cls;
-  struct SlicerModifierCallbacks *cbs = value;
-
-  cbs->modifier_cb (cbs->cls, slicer->msg, slicer->message_id, slicer->mod_oper,
-                    slicer->mod_name, slicer->mod_value,
-                    slicer->mod_value_size, slicer->mod_full_value_size);
-  return GNUNET_YES;
-}
-
-
-/**
- * Process an incoming message part and call matching handlers.
- *
- * @param cls
- *        Closure.
- * @param message_id
- *        ID of the message.
- * @param flags
- *        Flags for the message.
- *        @see enum GNUNET_PSYC_MessageFlags
- * @param msg
- *        The message part. as it arrived from the network.
- */
-static void
-slicer_message (void *cls, const struct GNUNET_CRYPTO_EcdsaPublicKey *slave_key,
-                uint64_t message_id, uint32_t flags, uint64_t fragment_offset,
-                const struct GNUNET_MessageHeader *msg)
-{
-  struct GNUNET_SOCIAL_Slicer *slicer = cls;
-  slicer->nym_key = *slave_key;
-
-  uint16_t ptype = ntohs (msg->type);
-  if (GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_METHOD == ptype)
-  {
-    struct GNUNET_PSYC_MessageMethod *
-      meth = (struct GNUNET_PSYC_MessageMethod *) msg;
-    slicer->method_name_size = ntohs (meth->header.size) - sizeof (*meth);
-    slicer->method_name = GNUNET_malloc (slicer->method_name_size);
-    memcpy (slicer->method_name, &meth[1], slicer->method_name_size);
-    slicer->message_id = message_id;
-  }
-  else
-  {
-    GNUNET_assert (message_id == slicer->message_id);
-  }
-
-  char *nym_str = GNUNET_CRYPTO_ecdsa_public_key_to_string (slave_key);
-  LOG (GNUNET_ERROR_TYPE_DEBUG,
-       "Slicer received message of type %u and size %u, "
-       "with ID %" PRIu64 " and method %s from %s\n",
-       ptype, ntohs (msg->size), message_id, slicer->method_name, nym_str);
-  GNUNET_free (nym_str);
-
-  slicer->msg = msg;
-
-  /* try-and-slice modifier */
-
-  switch (ptype)
-  {
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MODIFIER:
-  {
-    struct GNUNET_PSYC_MessageModifier *
-      mod = (struct GNUNET_PSYC_MessageModifier *) msg;
-    slicer->mod_oper = mod->oper;
-    slicer->mod_name_size = ntohs (mod->name_size);
-    slicer->mod_name = GNUNET_malloc (slicer->mod_name_size);
-    memcpy (slicer->mod_name, &mod[1], slicer->mod_name_size);
-    slicer->mod_value = (char *) &mod[1] + slicer->mod_name_size;
-    slicer->mod_full_value_size = ntohs (mod->value_size);
-    slicer->mod_value_remaining = slicer->mod_full_value_size;
-    slicer->mod_value_size
-      = ntohs (mod->header.size) - sizeof (*mod) - slicer->mod_name_size;
-  }
-  case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MOD_CONT:
-    if (ptype == GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MOD_CONT)
-    {
-      slicer->mod_value = (char *) &msg[1];
-      slicer->mod_value_size = ntohs (msg->size) - sizeof (*msg);
-    }
-    slicer->mod_value_remaining -= slicer->mod_value_size;
-    char *name = GNUNET_malloc (slicer->mod_name_size);
-    memcpy (name, slicer->mod_name, slicer->mod_name_size);
-    do
-    {
-      struct GNUNET_HashCode key;
-      uint16_t name_len = strlen (name);
-      GNUNET_CRYPTO_hash (name, name_len, &key);
-      GNUNET_CONTAINER_multihashmap_get_multiple (slicer->modifier_handlers, &key,
-                                                  slicer_modifier_handler_notify,
-                                                  slicer);
-      char *p = strrchr (name, '_');
-      if (NULL == p)
-        break;
-      *p = '\0';
-    } while (1);
-    GNUNET_free (name);
-  }
-
-  /* try-and-slice method */
-
-  char *name = GNUNET_malloc (slicer->method_name_size);
-  memcpy (name, slicer->method_name, slicer->method_name_size);
-  do
-  {
-    struct GNUNET_HashCode key;
-    uint16_t name_len = strlen (name);
-    GNUNET_CRYPTO_hash (name, name_len, &key);
-    GNUNET_CONTAINER_multihashmap_get_multiple (slicer->method_handlers, &key,
-                                                slicer_method_handler_notify,
-                                                slicer);
-    char *p = strrchr (name, '_');
-    if (NULL == p)
-      break;
-    *p = '\0';
-  } while (1);
-  GNUNET_free (name);
-
-  if (GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_END <= ptype)
-    GNUNET_free (slicer->method_name);
-
-  if (0 == slicer->mod_value_remaining && NULL != slicer->mod_name)
-  {
-    GNUNET_free (slicer->mod_name);
-    slicer->mod_name = NULL;
-    slicer->mod_name_size = 0;
-    slicer->mod_value_size = 0;
-    slicer->mod_full_value_size = 0;
-    slicer->mod_oper = 0;
-  }
-
-  slicer->msg = NULL;
-}
-
-
-/**
- * Create a try-and-slice instance.
- *
- * A slicer processes incoming messages and notifies callbacks about matching
- * methods or modifiers encountered.
- *
- * @return A new try-and-slice construct.
- */
-struct GNUNET_SOCIAL_Slicer *
-GNUNET_SOCIAL_slicer_create (void)
-{
-  struct GNUNET_SOCIAL_Slicer *slicer = GNUNET_malloc (sizeof (*slicer));
-  slicer->method_handlers = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_NO);
-  slicer->modifier_handlers = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_NO);
-  return slicer;
-}
-
-
-/**
- * Add a method to the try-and-slice instance.
- *
- * The callbacks are called for messages with a matching @a method_name prefix.
- *
- * @param slicer
- *        The try-and-slice instance to extend.
- * @param method_name
- *        Name of the given method, use empty string to match all.
- * @param method_cb
- *        Method handler invoked upon a matching message.
- * @param modifier_cb
- *        Modifier handler, invoked after @a method_cb
- *        for each modifier in the message.
- * @param data_cb
- *        Data handler, invoked after @a modifier_cb for each data fragment.
- * @param eom_cb
- *        Invoked upon reaching the end of a matching message.
- * @param cls
- *        Closure for the callbacks.
- */
-void
-GNUNET_SOCIAL_slicer_method_add (struct GNUNET_SOCIAL_Slicer *slicer,
-                                 const char *method_name,
-                                 GNUNET_SOCIAL_MethodCallback method_cb,
-                                 GNUNET_SOCIAL_ModifierCallback modifier_cb,
-                                 GNUNET_SOCIAL_DataCallback data_cb,
-                                 GNUNET_SOCIAL_EndOfMessageCallback eom_cb,
-                                 void *cls)
-{
-  struct GNUNET_HashCode key;
-  GNUNET_CRYPTO_hash (method_name, strlen (method_name), &key);
-
-  struct SlicerMethodCallbacks *cbs = GNUNET_malloc (sizeof (*cbs));
-  cbs->method_cb = method_cb;
-  cbs->modifier_cb = modifier_cb;
-  cbs->data_cb = data_cb;
-  cbs->eom_cb = eom_cb;
-  cbs->cls = cls;
-
-  GNUNET_CONTAINER_multihashmap_put (slicer->method_handlers, &key, cbs,
-                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
-}
-
-
-int
-slicer_method_remove (void *cls, const struct GNUNET_HashCode *key, void *value)
-{
-  struct SlicerMethodRemoveClosure *rm_cls = cls;
-  struct GNUNET_SOCIAL_Slicer *slicer = rm_cls->slicer;
-  struct SlicerMethodCallbacks *rm_cbs = &rm_cls->rm_cbs;
-  struct SlicerMethodCallbacks *cbs = value;
-
-  if (cbs->method_cb == rm_cbs->method_cb
-      && cbs->modifier_cb == rm_cbs->modifier_cb
-      && cbs->data_cb == rm_cbs->data_cb
-      && cbs->eom_cb == rm_cbs->eom_cb)
-  {
-    GNUNET_CONTAINER_multihashmap_remove (slicer->method_handlers, key, cbs);
-    GNUNET_free (cbs);
-    return GNUNET_NO;
-  }
-  return GNUNET_YES;
-}
-
-
-/**
- * Remove a registered method from the try-and-slice instance.
- *
- * Removes one matching handler registered with the given
- * @a method_name and  callbacks.
- *
- * @param slicer
- *        The try-and-slice instance.
- * @param method_name
- *        Name of the method to remove.
- * @param method_cb
- *        Method handler.
- * @param modifier_cb
- *        Modifier handler.
- * @param data_cb
- *        Data handler.
- * @param eom_cb
- *        End of message handler.
- *
- * @return #GNUNET_OK if a method handler was removed,
- *         #GNUNET_NO if no handler matched the given method name and callbacks.
- */
-int
-GNUNET_SOCIAL_slicer_method_remove (struct GNUNET_SOCIAL_Slicer *slicer,
-                                    const char *method_name,
-                                    GNUNET_SOCIAL_MethodCallback method_cb,
-                                    GNUNET_SOCIAL_ModifierCallback modifier_cb,
-                                    GNUNET_SOCIAL_DataCallback data_cb,
-                                    GNUNET_SOCIAL_EndOfMessageCallback eom_cb)
-{
-  struct GNUNET_HashCode key;
-  GNUNET_CRYPTO_hash (method_name, strlen (method_name), &key);
-
-  struct SlicerMethodRemoveClosure rm_cls;
-  rm_cls.slicer = slicer;
-  struct SlicerMethodCallbacks *rm_cbs = &rm_cls.rm_cbs;
-  rm_cbs->method_cb = method_cb;
-  rm_cbs->modifier_cb = modifier_cb;
-  rm_cbs->data_cb = data_cb;
-  rm_cbs->eom_cb = eom_cb;
-
-  return
-    (GNUNET_SYSERR
-     == GNUNET_CONTAINER_multihashmap_get_multiple (slicer->method_handlers, &key,
-                                                    slicer_method_remove,
-                                                    &rm_cls))
-    ? GNUNET_NO
-    : GNUNET_OK;
-}
-
-
-/**
- * Watch a place for changed objects.
- *
- * @param slicer
- *        The try-and-slice instance.
- * @param object_filter
- *        Object prefix to match.
- * @param modifier_cb
- *        Function to call when encountering a state modifier.
- * @param cls
- *        Closure for callback.
- */
-void
-GNUNET_SOCIAL_slicer_modifier_add (struct GNUNET_SOCIAL_Slicer *slicer,
-                                   const char *object_filter,
-                                   GNUNET_SOCIAL_ModifierCallback modifier_cb,
-                                   void *cls)
-{
-  struct SlicerModifierCallbacks *cbs = GNUNET_malloc (sizeof *cbs);
-  cbs->modifier_cb = modifier_cb;
-  cbs->cls = cls;
-
-  struct GNUNET_HashCode key;
-  GNUNET_CRYPTO_hash (object_filter, strlen (object_filter), &key);
-  GNUNET_CONTAINER_multihashmap_put (slicer->modifier_handlers, &key, cbs,
-                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
-}
+/*** PLACE ***/
 
 
-int
-slicer_modifier_remove (void *cls, const struct GNUNET_HashCode *key, void *value)
+static int
+check_place_result (void *cls,
+                    const struct GNUNET_OperationResultMessage *res)
 {
-  struct SlicerModifierRemoveClosure *rm_cls = cls;
-  struct GNUNET_SOCIAL_Slicer *slicer = rm_cls->slicer;
-  struct SlicerModifierCallbacks *rm_cbs = &rm_cls->rm_cbs;
-  struct SlicerModifierCallbacks *cbs = value;
-
-  if (cbs->modifier_cb == rm_cbs->modifier_cb)
-  {
-    GNUNET_CONTAINER_multihashmap_remove (slicer->modifier_handlers, key, cbs);
-    GNUNET_free (cbs);
-    return GNUNET_NO;
+  uint16_t size = ntohs (res->header.size);
+  if (size < sizeof (*res))
+  { /* Error, message too small. */
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
   }
-  return GNUNET_YES;
-}
-
-
-/**
- * Remove a registered modifier from the try-and-slice instance.
- *
- * Removes one matching handler registered with the given
- * @a object_filter and @a modifier_cb.
- *
- * @param slicer
- *        The try-and-slice instance.
- * @param object_filter
- *        Object prefix to match.
- * @param modifier_cb
- *        Function to call when encountering a state modifier changes.
- */
-int
-GNUNET_SOCIAL_slicer_modifier_remove (struct GNUNET_SOCIAL_Slicer *slicer,
-                                      const char *object_filter,
-                                      GNUNET_SOCIAL_ModifierCallback modifier_cb)
-{
-  struct GNUNET_HashCode key;
-  GNUNET_CRYPTO_hash (object_filter, strlen (object_filter), &key);
-
-  struct SlicerModifierRemoveClosure rm_cls;
-  rm_cls.slicer = slicer;
-  struct SlicerModifierCallbacks *rm_cbs = &rm_cls.rm_cbs;
-  rm_cbs->modifier_cb = modifier_cb;
-
-  return
-    (GNUNET_SYSERR
-     == GNUNET_CONTAINER_multihashmap_get_multiple (slicer->modifier_handlers, &key,
-                                                    slicer_modifier_remove,
-                                                    &rm_cls))
-    ? GNUNET_NO
-    : GNUNET_OK;
- }
-
-
-int
-slicer_method_free (void *cls, const struct GNUNET_HashCode *key, void *value)
-{
-  struct SlicerMethodCallbacks *cbs = value;
-  GNUNET_free (cbs);
-  return GNUNET_YES;
-}
-
-
-/**
- * Destroy a given try-and-slice instance.
- *
- * @param slicer
- *        Slicer to destroy
- */
-void
-GNUNET_SOCIAL_slicer_destroy (struct GNUNET_SOCIAL_Slicer *slicer)
-{
-  GNUNET_CONTAINER_multihashmap_iterate (slicer->method_handlers,
-                                         slicer_method_free, NULL);
-  GNUNET_CONTAINER_multihashmap_destroy (slicer->method_handlers);
-  GNUNET_free (slicer);
-}
-
-/*** CLIENT ***/
-
-
-static void
-app_send_connect_msg (struct GNUNET_SOCIAL_App *app)
-{
-  uint16_t cmsg_size = ntohs (app->connect_msg->size);
-  struct GNUNET_MessageHeader * cmsg = GNUNET_malloc (cmsg_size);
-  memcpy (cmsg, app->connect_msg, cmsg_size);
-  GNUNET_CLIENT_MANAGER_transmit_now (app->client, cmsg);
-}
-
-
-static void
-app_recv_disconnect (void *cls,
-                     struct GNUNET_CLIENT_MANAGER_Connection *client,
-                     const struct GNUNET_MessageHeader *msg)
-{
-  struct GNUNET_SOCIAL_App *
-    app = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*app));
-
-  GNUNET_CLIENT_MANAGER_reconnect (client);
-  app_send_connect_msg (app);
+  return GNUNET_OK;
 }
 
 
-/*** PLACE ***/
-
-
 static void
-place_send_connect_msg (struct GNUNET_SOCIAL_Place *plc)
+handle_place_result (void *cls,
+                     const struct GNUNET_OperationResultMessage *res)
 {
-  uint16_t cmsg_size = ntohs (plc->connect_msg->size);
-  struct GNUNET_MessageHeader * cmsg = GNUNET_malloc (cmsg_size);
-  memcpy (cmsg, plc->connect_msg, cmsg_size);
-  GNUNET_CLIENT_MANAGER_transmit_now (plc->client, cmsg);
-}
+  struct GNUNET_SOCIAL_Place *plc = cls;
 
+  uint16_t size = ntohs (res->header.size);
+  uint16_t data_size = size - sizeof (*res);
+  const char *data = (0 < data_size) ? (const char *) &res[1] : NULL;
 
-static void
-place_recv_disconnect (void *cls,
-                       struct GNUNET_CLIENT_MANAGER_Connection *client,
-                       const struct GNUNET_MessageHeader *msg)
-{
-  struct GNUNET_SOCIAL_Place *
-    plc = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*plc));
-
-  GNUNET_CLIENT_MANAGER_reconnect (client);
-  place_send_connect_msg (plc);
+  GNUNET_OP_result (plc->op, GNUNET_ntohll (res->op_id),
+                    GNUNET_ntohll (res->result_code),
+                    data, data_size, NULL);
 }
 
 
-static void
-place_recv_result (void *cls,
-                   struct GNUNET_CLIENT_MANAGER_Connection *client,
-                   const struct GNUNET_MessageHeader *msg)
+static int
+check_app_result (void *cls,
+                  const struct GNUNET_OperationResultMessage *res)
 {
-  struct GNUNET_SOCIAL_Place *
-    plc = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*plc));
-
-  const struct GNUNET_OperationResultMessage *
-    res = (const struct GNUNET_OperationResultMessage *) msg;
-
-  uint16_t size = ntohs (msg->size);
+  uint16_t size = ntohs (res->header.size);
   if (size < sizeof (*res))
   { /* Error, message too small. */
     GNUNET_break (0);
-    return;
+    return GNUNET_SYSERR;
   }
-
-  uint16_t data_size = size - sizeof (*res);
-  const char *data = (0 < data_size) ? (const char *) &res[1] : NULL;
-  GNUNET_CLIENT_MANAGER_op_result (plc->client, GNUNET_ntohll (res->op_id),
-                                   GNUNET_ntohll (res->result_code),
-                                   data, data_size);
+  return GNUNET_OK;
 }
 
 
 static void
-app_recv_result (void *cls,
-                 struct GNUNET_CLIENT_MANAGER_Connection *client,
-                 const struct GNUNET_MessageHeader *msg)
+handle_app_result (void *cls,
+                   const struct GNUNET_OperationResultMessage *res)
 {
-  struct GNUNET_SOCIAL_App *
-    app = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*app));
-
-  const struct GNUNET_OperationResultMessage *
-    res = (const struct GNUNET_OperationResultMessage *) msg;
-
-  uint16_t size = ntohs (msg->size);
-  if (size < sizeof (*res))
-  { /* Error, message too small. */
-    GNUNET_break (0);
-    return;
-  }
+  struct GNUNET_SOCIAL_App *app = cls;
 
+  uint16_t size = ntohs (res->header.size);
   uint16_t data_size = size - sizeof (*res);
   const char *data = (0 < data_size) ? (const char *) &res[1] : NULL;
-  GNUNET_CLIENT_MANAGER_op_result (app->client, GNUNET_ntohll (res->op_id),
-                                   GNUNET_ntohll (res->result_code),
-                                   data, data_size);
+
+  GNUNET_OP_result (app->op, GNUNET_ntohll (res->op_id),
+                    GNUNET_ntohll (res->result_code),
+                    data, data_size, NULL);
 }
 
 
@@ -1199,7 +647,6 @@ op_recv_history_result (void *cls, int64_t result,
   if (NULL != hist->result_cb)
     hist->result_cb (hist->cls, result, err_msg, err_msg_size);
 
-  GNUNET_PSYC_receive_destroy (hist->recv);
   GNUNET_free (hist);
 }
 
@@ -1220,18 +667,30 @@ op_recv_state_result (void *cls, int64_t result,
 }
 
 
-static void
-place_recv_history_result (void *cls,
-                           struct GNUNET_CLIENT_MANAGER_Connection *client,
-                           const struct GNUNET_MessageHeader *msg)
+static int
+check_place_history_result (void *cls,
+                            const struct GNUNET_OperationResultMessage *res)
 {
-  struct GNUNET_SOCIAL_Place *
-    plc = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*plc));
+  struct GNUNET_PSYC_MessageHeader *
+    pmsg = (struct GNUNET_PSYC_MessageHeader *) GNUNET_MQ_extract_nested_mh (res);
+  uint16_t size = ntohs (res->header.size);
+
+  if (NULL == pmsg || size < sizeof (*res) + sizeof (*pmsg))
+  { /* Error, message too small. */
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
 
-  const struct GNUNET_OperationResultMessage *
-    res = (const struct GNUNET_OperationResultMessage *) msg;
+
+static void
+handle_place_history_result (void *cls,
+                             const struct GNUNET_OperationResultMessage *res)
+{
+  struct GNUNET_SOCIAL_Place *plc = cls;
   struct GNUNET_PSYC_MessageHeader *
-    pmsg = (struct GNUNET_PSYC_MessageHeader *) &res[1];
+    pmsg = (struct GNUNET_PSYC_MessageHeader *) GNUNET_MQ_extract_nested_mh (res);
 
   LOG (GNUNET_ERROR_TYPE_DEBUG,
        "%p Received historic fragment for message #%" PRIu64 ".\n",
@@ -1240,9 +699,9 @@ place_recv_history_result (void *cls,
   GNUNET_ResultCallback result_cb = NULL;
   struct GNUNET_SOCIAL_HistoryRequest *hist = NULL;
 
-  if (GNUNET_YES != GNUNET_CLIENT_MANAGER_op_find (plc->client,
-                                                   GNUNET_ntohll (res->op_id),
-                                                   &result_cb, (void *) &hist))
+  if (GNUNET_YES != GNUNET_OP_get (plc->op,
+                                   GNUNET_ntohll (res->op_id),
+                                   &result_cb, (void *) &hist, NULL))
   { /* Operation not found. */
     LOG (GNUNET_ERROR_TYPE_WARNING,
          "%p Replay operation not found for historic fragment of message #%"
@@ -1251,50 +710,57 @@ place_recv_history_result (void *cls,
     return;
   }
 
-  uint16_t size = ntohs (msg->size);
-  if (size < sizeof (*res) + sizeof (*pmsg))
-  { /* Error, message too small. */
-    GNUNET_break (0);
-    return;
+  GNUNET_PSYC_slicer_message (hist->slicer,
+                              (const struct GNUNET_PSYC_MessageHeader *) pmsg);
+}
+
+
+static int
+check_place_state_result (void *cls,
+                          const struct GNUNET_OperationResultMessage *res)
+{
+  const struct GNUNET_MessageHeader *mod = GNUNET_MQ_extract_nested_mh (res);
+  if (NULL == mod)
+  {
+    GNUNET_break_op (0);
+    LOG (GNUNET_ERROR_TYPE_WARNING,
+         "Invalid modifier in state result\n");
+    return GNUNET_SYSERR;
   }
 
-  GNUNET_PSYC_receive_message (hist->recv,
-                               (const struct GNUNET_PSYC_MessageHeader *) pmsg);
+  uint16_t size = ntohs (res->header.size);
+  uint16_t mod_size = ntohs (mod->size);
+  if (size - sizeof (*res) != mod_size)
+  {
+    GNUNET_break_op (0);
+    LOG (GNUNET_ERROR_TYPE_WARNING,
+         "Invalid modifier size in state result: %u - %u != %u\n",
+         ntohs (res->header.size), sizeof (*res), mod_size);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
 }
 
 
 static void
-place_recv_state_result (void *cls,
-                         struct GNUNET_CLIENT_MANAGER_Connection *client,
-                         const struct GNUNET_MessageHeader *msg)
+handle_place_state_result (void *cls,
+                           const struct GNUNET_OperationResultMessage *res)
 {
-  struct GNUNET_SOCIAL_Place *
-    plc = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*plc));
-
-  const struct GNUNET_OperationResultMessage *
-    res = (const struct GNUNET_OperationResultMessage *) msg;
+  struct GNUNET_SOCIAL_Place *plc = cls;
 
   GNUNET_ResultCallback result_cb = NULL;
   struct GNUNET_SOCIAL_LookHandle *look = NULL;
 
-  if (GNUNET_YES != GNUNET_CLIENT_MANAGER_op_find (plc->client,
-                                                   GNUNET_ntohll (res->op_id),
-                                                   &result_cb, (void *) &look))
+  if (GNUNET_YES != GNUNET_OP_get (plc->op,
+                                   GNUNET_ntohll (res->op_id),
+                                   &result_cb, (void *) &look, NULL))
   { /* Operation not found. */
     return;
   }
 
-  const struct GNUNET_MessageHeader *
-    mod = (struct GNUNET_MessageHeader *) &res[1];
+  const struct GNUNET_MessageHeader *mod = GNUNET_MQ_extract_nested_mh (res);
   uint16_t mod_size = ntohs (mod->size);
-  if (ntohs (msg->size) - sizeof (*res) != mod_size)
-  {
-    GNUNET_break_op (0);
-    LOG (GNUNET_ERROR_TYPE_WARNING,
-         "Invalid modifier size in state result: %u - %u != %u\n",
-         ntohs (msg->size), sizeof (*res), mod_size);
-    return;
-  }
+
   switch (ntohs (mod->type))
   {
   case GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_MODIFIER:
@@ -1304,7 +770,9 @@ place_recv_state_result (void *cls,
 
     const char *name = (const char *) &pmod[1];
     uint16_t name_size = ntohs (pmod->name_size);
-    if ('\0' != name[name_size - 1])
+    if (0 == name_size
+        || mod_size - sizeof (*pmod) < name_size
+        || '\0' != name[name_size - 1])
     {
       GNUNET_break_op (0);
       LOG (GNUNET_ERROR_TYPE_WARNING,
@@ -1319,7 +787,7 @@ place_recv_state_result (void *cls,
     {
         look->mod_value_remaining = look->mod_value_size;
         look->mod_name = GNUNET_malloc (name_size);
-        memcpy (look->mod_name, name, name_size);
+        GNUNET_memcpy (look->mod_name, name, name_size);
     }
     break;
   }
@@ -1338,52 +806,58 @@ place_recv_state_result (void *cls,
 
 
 static void
-place_recv_message_ack (void *cls,
-                        struct GNUNET_CLIENT_MANAGER_Connection *client,
-                        const struct GNUNET_MessageHeader *msg)
+handle_place_message_ack (void *cls,
+                          const struct GNUNET_MessageHeader *msg)
 {
-  struct GNUNET_SOCIAL_Place *
-    plc = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*plc));
+  struct GNUNET_SOCIAL_Place *plc = cls;
+
   GNUNET_PSYC_transmit_got_ack (plc->tmit);
 }
 
 
+static int
+check_place_message (void *cls,
+                     const struct GNUNET_PSYC_MessageHeader *pmsg)
+{
+  return GNUNET_OK;
+}
+
+
 static void
-place_recv_message (void *cls,
-                    struct GNUNET_CLIENT_MANAGER_Connection *client,
-                    const struct GNUNET_MessageHeader *msg)
+handle_place_message (void *cls,
+                      const struct GNUNET_PSYC_MessageHeader *pmsg)
 {
-  struct GNUNET_SOCIAL_Place *
-    plc = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*plc));
-  GNUNET_PSYC_receive_message (plc->recv,
-                               (const struct GNUNET_PSYC_MessageHeader *) msg);
+  struct GNUNET_SOCIAL_Place *plc = cls;
+
+  GNUNET_PSYC_slicer_message (plc->slicer, pmsg);
+}
+
+
+static int
+check_host_message (void *cls,
+                    const struct GNUNET_PSYC_MessageHeader *pmsg)
+{
+  return GNUNET_OK;
 }
 
 
 static void
-host_recv_message (void *cls,
-                   struct GNUNET_CLIENT_MANAGER_Connection *client,
-                   const struct GNUNET_MessageHeader *msg)
+handle_host_message (void *cls,
+                     const struct GNUNET_PSYC_MessageHeader *pmsg)
 {
-  struct GNUNET_SOCIAL_Host *
-    hst = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (hst->plc));
-  GNUNET_PSYC_receive_message (hst->recv,
-                               (const struct GNUNET_PSYC_MessageHeader *) msg);
-  GNUNET_PSYC_receive_message (hst->plc.recv,
-                               (const struct GNUNET_PSYC_MessageHeader *) msg);
+  struct GNUNET_SOCIAL_Host *hst = cls;
+
+  GNUNET_PSYC_slicer_message (hst->slicer, pmsg);
+  GNUNET_PSYC_slicer_message (hst->plc.slicer, pmsg);
 }
 
 
 static void
-host_recv_enter_ack (void *cls,
-                     struct GNUNET_CLIENT_MANAGER_Connection *client,
-                     const struct GNUNET_MessageHeader *msg)
+handle_host_enter_ack (void *cls,
+                       const struct HostEnterAck *hack)
 {
-  struct GNUNET_SOCIAL_Host *
-    hst = GNUNET_CLIENT_MANAGER_get_user_context_ (client,
-                                                   sizeof (struct GNUNET_SOCIAL_Place));
+  struct GNUNET_SOCIAL_Host *hst = cls;
 
-  struct HostEnterAck *hack = (struct HostEnterAck *) msg;
   hst->plc.pub_key = hack->place_pub_key;
 
   int32_t result = ntohl (hack->result_code);
@@ -1393,43 +867,47 @@ host_recv_enter_ack (void *cls,
 }
 
 
+static int
+check_host_enter_request (void *cls,
+                          const struct GNUNET_PSYC_JoinRequestMessage *req)
+{
+  return GNUNET_OK;
+}
+
+
 static void
-host_recv_enter_request (void *cls,
-                         struct GNUNET_CLIENT_MANAGER_Connection *client,
-                         const struct GNUNET_MessageHeader *msg)
+handle_host_enter_request (void *cls,
+                           const struct GNUNET_PSYC_JoinRequestMessage *req)
 {
-  struct GNUNET_SOCIAL_Host *
-    hst = GNUNET_CLIENT_MANAGER_get_user_context_ (client,
-                                                   sizeof (struct GNUNET_SOCIAL_Place));
+  struct GNUNET_SOCIAL_Host *hst = cls;
+
   if (NULL == hst->answer_door_cb)
      return;
 
   const char *method_name = NULL;
-  struct GNUNET_ENV_Environment *env = NULL;
+  struct GNUNET_PSYC_Environment *env = NULL;
   struct GNUNET_PSYC_MessageHeader *entry_pmsg = NULL;
   const void *data = NULL;
   uint16_t data_size = 0;
   char *str;
-  const struct GNUNET_PSYC_JoinRequestMessage *
-    req = (const struct GNUNET_PSYC_JoinRequestMessage *) msg;
   const struct GNUNET_PSYC_Message *join_msg = NULL;
 
   do
   {
     if (sizeof (*req) + sizeof (*join_msg) <= ntohs (req->header.size))
     {
-      join_msg = (struct GNUNET_PSYC_Message *) &req[1];
+      join_msg = (struct GNUNET_PSYC_Message *) GNUNET_MQ_extract_nested_mh (req);
       LOG (GNUNET_ERROR_TYPE_DEBUG,
            "Received join_msg of type %u and size %u.\n",
            ntohs (join_msg->header.type), ntohs (join_msg->header.size));
 
-      env = GNUNET_ENV_environment_create ();
+      env = GNUNET_PSYC_env_create ();
       entry_pmsg = GNUNET_PSYC_message_header_create_from_psyc (join_msg);
       if (GNUNET_OK != GNUNET_PSYC_message_parse (entry_pmsg, &method_name, env,
                                                   &data, &data_size))
       {
         GNUNET_break_op (0);
-        str = GNUNET_CRYPTO_ecdsa_public_key_to_string (&req->slave_key);
+        str = GNUNET_CRYPTO_ecdsa_public_key_to_string (&req->slave_pub_key);
         LOG (GNUNET_ERROR_TYPE_WARNING,
              "Ignoring invalid entry request from nym %s.\n",
              str);
@@ -1438,65 +916,67 @@ host_recv_enter_request (void *cls,
       }
     }
 
-    struct GNUNET_SOCIAL_Nym *nym = nym_get_or_create (&req->slave_key);
+    struct GNUNET_SOCIAL_Nym *nym = nym_get_or_create (&req->slave_pub_key);
     hst->answer_door_cb (hst->cb_cls, nym, method_name, env,
-                         data_size, data);
+                         data, data_size);
   } while (0);
 
   if (NULL != env)
-    GNUNET_ENV_environment_destroy (env);
+    GNUNET_PSYC_env_destroy (env);
   if (NULL != entry_pmsg)
     GNUNET_free (entry_pmsg);
 }
 
 
 static void
-guest_recv_enter_ack (void *cls,
-                     struct GNUNET_CLIENT_MANAGER_Connection *client,
-                     const struct GNUNET_MessageHeader *msg)
+handle_guest_enter_ack (void *cls,
+                        const struct GNUNET_PSYC_CountersResultMessage *cres)
 {
-  struct GNUNET_SOCIAL_Guest *
-    gst = GNUNET_CLIENT_MANAGER_get_user_context_ (client,
-                                                   sizeof (struct GNUNET_SOCIAL_Place));
+  struct GNUNET_SOCIAL_Guest *gst = cls;
 
-  struct GNUNET_PSYC_CountersResultMessage *
-    cres = (struct GNUNET_PSYC_CountersResultMessage *) msg;
   int32_t result = ntohl (cres->result_code);
   if (NULL != gst->enter_cb)
-    gst->enter_cb (gst->cb_cls, result, GNUNET_ntohll (cres->max_message_id));
+    gst->enter_cb (gst->cb_cls, result, &gst->plc.pub_key,
+                   GNUNET_ntohll (cres->max_message_id));
+}
+
+
+static int
+check_guest_enter_decision (void *cls,
+                            const struct GNUNET_PSYC_JoinDecisionMessage *dcsn)
+{
+  return GNUNET_OK;
 }
 
 
 static void
-guest_recv_join_decision (void *cls,
-                          struct GNUNET_CLIENT_MANAGER_Connection *client,
-                          const struct GNUNET_MessageHeader *msg)
+handle_guest_enter_decision (void *cls,
+                             const struct GNUNET_PSYC_JoinDecisionMessage *dcsn)
 {
-  struct GNUNET_SOCIAL_Guest *
-    gst = GNUNET_CLIENT_MANAGER_get_user_context_ (client,
-                                                   sizeof (struct GNUNET_SOCIAL_Place));
-  const struct GNUNET_PSYC_JoinDecisionMessage *
-    dcsn = (const struct GNUNET_PSYC_JoinDecisionMessage *) msg;
+  struct GNUNET_SOCIAL_Guest *gst = cls;
 
   struct GNUNET_PSYC_Message *pmsg = NULL;
-  if (ntohs (dcsn->header.size) <= sizeof (*dcsn) + sizeof (*pmsg))
-    pmsg = (struct GNUNET_PSYC_Message *) &dcsn[1];
+  if (ntohs (dcsn->header.size) > sizeof (*dcsn))
+    pmsg = (struct GNUNET_PSYC_Message *) GNUNET_MQ_extract_nested_mh (dcsn);
 
   if (NULL != gst->entry_dcsn_cb)
     gst->entry_dcsn_cb (gst->cb_cls, ntohl (dcsn->is_admitted), pmsg);
 }
 
 
+static int
+check_app_ego (void *cls,
+               const struct AppEgoMessage *emsg)
+{
+  return GNUNET_OK;
+}
+
+
 static void
-app_recv_ego (void *cls,
-              struct GNUNET_CLIENT_MANAGER_Connection *client,
-              const struct GNUNET_MessageHeader *msg)
+handle_app_ego (void *cls,
+                const struct AppEgoMessage *emsg)
 {
-  struct GNUNET_SOCIAL_App *
-    app = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*app));
-
-  struct AppEgoMessage *
-    emsg = (struct AppEgoMessage *) msg;
+  struct GNUNET_SOCIAL_App *app = cls;
 
   uint16_t name_size = ntohs (emsg->header.size) - sizeof (*emsg);
 
@@ -1511,12 +991,12 @@ app_recv_ego (void *cls,
     ego = GNUNET_malloc (sizeof (*ego));
     ego->pub_key = emsg->ego_pub_key;
     ego->name = GNUNET_malloc (name_size);
-    memcpy (ego->name, &emsg[1], name_size);
+    GNUNET_memcpy (ego->name, &emsg[1], name_size);
   }
   else
   {
     ego->name = GNUNET_realloc (ego->name, name_size);
-    memcpy (ego->name, &emsg[1], name_size);
+    GNUNET_memcpy (ego->name, &emsg[1], name_size);
   }
 
   GNUNET_CONTAINER_multihashmap_put (app->egos, &ego_pub_hash, ego,
@@ -1528,15 +1008,26 @@ app_recv_ego (void *cls,
 
 
 static void
-app_recv_place (void *cls,
-                struct GNUNET_CLIENT_MANAGER_Connection *client,
-                const struct GNUNET_MessageHeader *msg)
+handle_app_ego_end (void *cls,
+                    const struct GNUNET_MessageHeader *msg)
+{
+  //struct GNUNET_SOCIAL_App *app = cls;
+}
+
+
+static int
+check_app_place (void *cls,
+                 const struct AppPlaceMessage *pmsg)
 {
-  struct GNUNET_SOCIAL_App *
-    app = GNUNET_CLIENT_MANAGER_get_user_context_ (client, sizeof (*app));
+  return GNUNET_OK;
+}
 
-  struct AppPlaceMessage *
-    pmsg = (struct AppPlaceMessage *) msg;
+
+static void
+handle_app_place (void *cls,
+                  const struct AppPlaceMessage *pmsg)
+{
+  struct GNUNET_SOCIAL_App *app = cls;
 
   if ((GNUNET_YES == pmsg->is_host && NULL == app->host_cb)
       || (GNUNET_NO == pmsg->is_host && NULL == app->guest_cb))
@@ -1549,167 +1040,160 @@ app_recv_place (void *cls,
     ego = GNUNET_CONTAINER_multihashmap_get (app->egos, &ego_pub_hash);
   if (NULL == ego)
   {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failure to obtain ego %s.\n",
+               GNUNET_h2s (&ego_pub_hash));
     GNUNET_break (0);
     return;
   }
 
   if (GNUNET_YES == pmsg->is_host)
   {
-    struct GNUNET_SOCIAL_HostConnection *hconn = GNUNET_malloc (sizeof (*hconn));
-    hconn->app = app;
-    hconn->plc_msg = *pmsg;
-    app->host_cb (app->cb_cls, hconn, ego, &pmsg->place_pub_key, pmsg->place_state);
+    if (NULL != app->host_cb) {
+      struct GNUNET_SOCIAL_HostConnection *hconn = GNUNET_malloc (sizeof (*hconn));
+      hconn->app = app;
+      hconn->plc_msg = *pmsg;
+      app->host_cb (app->cb_cls, hconn, ego, &pmsg->place_pub_key, pmsg->place_state);
+      GNUNET_free (hconn);
+    }
   }
-  else
+  else if (NULL != app->guest_cb)
   {
     struct GNUNET_SOCIAL_GuestConnection *gconn = GNUNET_malloc (sizeof (*gconn));
     gconn->app = app;
     gconn->plc_msg = *pmsg;
     app->guest_cb (app->cb_cls, gconn, ego, &pmsg->place_pub_key, pmsg->place_state);
+    GNUNET_free (gconn);
   }
 }
 
 
-static struct GNUNET_CLIENT_MANAGER_MessageHandler host_handlers[] =
+static void
+handle_app_place_end (void *cls,
+                      const struct GNUNET_MessageHeader *msg)
 {
-  { host_recv_enter_ack, NULL,
-    GNUNET_MESSAGE_TYPE_SOCIAL_HOST_ENTER_ACK,
-    sizeof (struct HostEnterAck), GNUNET_NO },
+  struct GNUNET_SOCIAL_App *app = cls;
 
-  { host_recv_enter_request, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_JOIN_REQUEST,
-    sizeof (struct GNUNET_PSYC_JoinRequestMessage), GNUNET_YES },
-
-  { host_recv_message, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_MESSAGE,
-    sizeof (struct GNUNET_PSYC_MessageHeader), GNUNET_YES },
-
-  { place_recv_message_ack, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_ACK,
-    sizeof (struct GNUNET_MessageHeader), GNUNET_NO },
-
-  { place_recv_history_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_HISTORY_RESULT,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
-
-  { place_recv_state_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_STATE_RESULT,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
-
-  { place_recv_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_RESULT_CODE,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
-
-  { place_recv_disconnect, NULL, 0, 0, GNUNET_NO },
-
-  { NULL, NULL, 0, 0, GNUNET_NO }
-};
+  if (NULL != app->connected_cb)
+    app->connected_cb (app->cb_cls);
+}
 
 
-static struct GNUNET_CLIENT_MANAGER_MessageHandler guest_handlers[] =
+/**
+ * Handler for a #GNUNET_MESSAGE_TYPE_SOCIAL_PLACE_LEAVE_ACK message received
+ * from the social service.
+ *
+ * @param cls the place of type `struct GNUNET_SOCIAL_Place`
+ * @param msg the message received from the service
+ */
+static void
+handle_place_leave_ack (void *cls,
+                        const struct GNUNET_MessageHeader *msg)
 {
-  { guest_recv_enter_ack, NULL,
-    GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER_ACK,
-    sizeof (struct GNUNET_PSYC_CountersResultMessage), GNUNET_NO },
-
-  { host_recv_enter_request, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_JOIN_REQUEST,
-    sizeof (struct GNUNET_PSYC_JoinRequestMessage), GNUNET_YES },
-
-  { place_recv_message, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_MESSAGE,
-    sizeof (struct GNUNET_PSYC_MessageHeader), GNUNET_YES },
+  struct GNUNET_SOCIAL_Place *plc = cls;
 
-  { place_recv_message_ack, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_ACK,
-    sizeof (struct GNUNET_MessageHeader), GNUNET_NO },
-
-  { guest_recv_join_decision, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_JOIN_DECISION,
-    sizeof (struct GNUNET_PSYC_JoinDecisionMessage), GNUNET_YES },
-
-  { place_recv_history_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_HISTORY_RESULT,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
-
-  { place_recv_state_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_STATE_RESULT,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
-
-  { place_recv_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_RESULT_CODE,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
-
-  { place_recv_disconnect, NULL, 0, 0, GNUNET_NO },
-
-  { NULL, NULL, 0, 0, GNUNET_NO }
-};
-
-
-
-static struct GNUNET_CLIENT_MANAGER_MessageHandler app_handlers[] =
-{
-  { app_recv_ego, NULL,
-    GNUNET_MESSAGE_TYPE_SOCIAL_APP_EGO,
-    sizeof (struct AppEgoMessage), GNUNET_YES },
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "%s left place %p\n",
+              plc->is_host ? "host" : "guest", 
+              plc);
+  place_disconnect (plc);  
+}
 
-  { app_recv_place, NULL,
-    GNUNET_MESSAGE_TYPE_SOCIAL_APP_PLACE,
-    sizeof (struct AppPlaceMessage), GNUNET_NO },
 
-  { app_recv_result, NULL,
-    GNUNET_MESSAGE_TYPE_PSYC_RESULT_CODE,
-    sizeof (struct GNUNET_OperationResultMessage), GNUNET_YES },
+/*** HOST ***/
 
-  { app_recv_disconnect, NULL, 0, 0, GNUNET_NO },
 
-  { NULL, NULL, 0, 0, GNUNET_NO }
-};
+static void
+host_connect (struct GNUNET_SOCIAL_Host *hst);
 
 
 static void
-place_cleanup (struct GNUNET_SOCIAL_Place *plc)
+host_reconnect (void *cls)
 {
-  if (NULL != plc->tmit)
-    GNUNET_PSYC_transmit_destroy (plc->tmit);
-  if (NULL != plc->recv)
-    GNUNET_PSYC_receive_destroy (plc->recv);
-  if (NULL != plc->connect_msg)
-    GNUNET_free (plc->connect_msg);
-  if (NULL != plc->disconnect_cb)
-    plc->disconnect_cb (plc->disconnect_cls);
+  host_connect (cls);
 }
 
 
+/**
+ * Host client disconnected from service.
+ *
+ * Reconnect after backoff period.
+ */
 static void
-host_cleanup (void *cls)
+host_disconnected (void *cls, enum GNUNET_MQ_Error error)
 {
   struct GNUNET_SOCIAL_Host *hst = cls;
-  place_cleanup (&hst->plc);
-  if (NULL != hst->recv)
+  struct GNUNET_SOCIAL_Place *plc = &hst->plc;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Host client disconnected (%d), re-connecting\n",
+       (int) error);
+  if (NULL != plc->tmit)
   {
-    GNUNET_PSYC_receive_destroy (hst->recv);
-    hst->recv = NULL;
+    GNUNET_PSYC_transmit_destroy (plc->tmit);
+    plc->tmit = NULL;
   }
-  if (NULL != hst->slicer)
+  if (NULL != plc->mq)
   {
-    GNUNET_SOCIAL_slicer_destroy (hst->slicer);
-    hst->slicer = NULL;
+    GNUNET_MQ_destroy (plc->mq);
+    plc->mq = NULL;
   }
-  GNUNET_free (hst);
+
+  plc->reconnect_task = GNUNET_SCHEDULER_add_delayed (plc->reconnect_delay,
+                                                      host_reconnect,
+                                                      hst);
+  plc->reconnect_delay = GNUNET_TIME_STD_BACKOFF (plc->reconnect_delay);
 }
 
 
 static void
-guest_cleanup (void *cls)
+host_connect (struct GNUNET_SOCIAL_Host *hst)
 {
-  struct GNUNET_SOCIAL_Guest *gst = cls;
-  place_cleanup (&gst->plc);
-  GNUNET_free (gst);
-}
+  struct GNUNET_SOCIAL_Place *plc = &hst->plc;
 
+  struct GNUNET_MQ_MessageHandler handlers[] = {
+    GNUNET_MQ_hd_fixed_size (host_enter_ack,
+                             GNUNET_MESSAGE_TYPE_SOCIAL_HOST_ENTER_ACK,
+                             struct HostEnterAck,
+                             hst),
+    GNUNET_MQ_hd_fixed_size (place_leave_ack,
+                             GNUNET_MESSAGE_TYPE_SOCIAL_PLACE_LEAVE_ACK,
+                             struct GNUNET_MessageHeader,
+                             plc),
+    GNUNET_MQ_hd_var_size (host_enter_request,
+                           GNUNET_MESSAGE_TYPE_PSYC_JOIN_REQUEST,
+                           struct GNUNET_PSYC_JoinRequestMessage,
+                           hst),
+    GNUNET_MQ_hd_var_size (host_message,
+                           GNUNET_MESSAGE_TYPE_PSYC_MESSAGE,
+                           struct GNUNET_PSYC_MessageHeader,
+                           hst),
+    GNUNET_MQ_hd_fixed_size (place_message_ack,
+                             GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_ACK,
+                             struct GNUNET_MessageHeader,
+                             plc),
+    GNUNET_MQ_hd_var_size (place_history_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_HISTORY_RESULT,
+                           struct GNUNET_OperationResultMessage,
+                           plc),
+    GNUNET_MQ_hd_var_size (place_state_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_STATE_RESULT,
+                           struct GNUNET_OperationResultMessage,
+                           plc),
+    GNUNET_MQ_hd_var_size (place_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_RESULT_CODE,
+                           struct GNUNET_OperationResultMessage,
+                           plc),
+    GNUNET_MQ_handler_end ()
+  };
+
+  plc->mq = GNUNET_CLIENT_connect (plc->cfg, "social",
+                                   handlers, host_disconnected, hst);
+  GNUNET_assert (NULL != plc->mq);
+  plc->tmit = GNUNET_PSYC_transmit_create (plc->mq);
+
+  GNUNET_MQ_send_copy (plc->mq, plc->connect_env);
+}
 
-/*** HOST ***/
 
 /**
  * Enter a place as host.
@@ -1721,9 +1205,6 @@ guest_cleanup (void *cls)
  *        Application handle.
  * @param ego
  *        Identity of the host.
- * @param place_key
- *        Private-public key pair of the place.
- *        NULL to generate a key.
  * @param policy
  *        Policy specifying entry and history restrictions for the place.
  * @param slicer
@@ -1737,13 +1218,13 @@ guest_cleanup (void *cls)
  * @param cls
  *        Closure for the callbacks.
  *
- * @return Handle for the host.
+ * @return Handle for the host. This handle contains the pubkey.
  */
 struct GNUNET_SOCIAL_Host *
 GNUNET_SOCIAL_host_enter (const struct GNUNET_SOCIAL_App *app,
                           const struct GNUNET_SOCIAL_Ego *ego,
                           enum GNUNET_PSYC_Policy policy,
-                          struct GNUNET_SOCIAL_Slicer *slicer,
+                          struct GNUNET_PSYC_Slicer *slicer,
                           GNUNET_SOCIAL_HostEnterCallback enter_cb,
                           GNUNET_SOCIAL_AnswerDoorCallback answer_door_cb,
                           GNUNET_SOCIAL_FarewellCallback farewell_cb,
@@ -1761,30 +1242,23 @@ GNUNET_SOCIAL_host_enter (const struct GNUNET_SOCIAL_App *app,
   hst->farewell_cb = farewell_cb;
   hst->cb_cls = cls;
 
-  plc->client = GNUNET_CLIENT_MANAGER_connect (plc->cfg, "social", host_handlers);
-  GNUNET_CLIENT_MANAGER_set_user_context_ (plc->client, hst, sizeof (*plc));
-
-  plc->tmit = GNUNET_PSYC_transmit_create (plc->client);
-  plc->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, plc->slicer);
+  plc->op = GNUNET_OP_create ();
 
-  hst->slicer = GNUNET_SOCIAL_slicer_create ();
-  GNUNET_SOCIAL_slicer_method_add (hst->slicer, "_notice_place_leave",
-                                   host_recv_notice_place_leave_method,
-                                   host_recv_notice_place_leave_modifier,
-                                   NULL, host_recv_notice_place_leave_eom, hst);
-  hst->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, hst->slicer);
+  hst->slicer = GNUNET_PSYC_slicer_create ();
+  GNUNET_PSYC_slicer_method_add (hst->slicer, "_notice_place_leave", NULL,
+                                 host_recv_notice_place_leave_method,
+                                 host_recv_notice_place_leave_modifier,
+                                 NULL, host_recv_notice_place_leave_eom, hst);
 
   uint16_t app_id_size = strlen (app->id) + 1;
-  struct HostEnterRequest *hreq = GNUNET_malloc (sizeof (*hreq) + app_id_size);
-  hreq->header.size = htons (sizeof (*hreq) + app_id_size);
-  hreq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_HOST_ENTER);
+  struct HostEnterRequest *hreq;
+  plc->connect_env = GNUNET_MQ_msg_extra (hreq, app_id_size,
+                                          GNUNET_MESSAGE_TYPE_SOCIAL_HOST_ENTER);
   hreq->policy = policy;
   hreq->ego_pub_key = ego->pub_key;
-  memcpy (&hreq[1], app->id, app_id_size);
-
-  plc->connect_msg = &hreq->header;
-  place_send_connect_msg (plc);
+  GNUNET_memcpy (&hreq[1], app->id, app_id_size);
 
+  host_connect (hst);
   return hst;
 }
 
@@ -1810,7 +1284,7 @@ GNUNET_SOCIAL_host_enter (const struct GNUNET_SOCIAL_App *app,
  */
  struct GNUNET_SOCIAL_Host *
 GNUNET_SOCIAL_host_enter_reconnect (struct GNUNET_SOCIAL_HostConnection *hconn,
-                                    struct GNUNET_SOCIAL_Slicer *slicer,
+                                    struct GNUNET_PSYC_Slicer *slicer,
                                     GNUNET_SOCIAL_HostEnterCallback enter_cb,
                                     GNUNET_SOCIAL_AnswerDoorCallback answer_door_cb,
                                     GNUNET_SOCIAL_FarewellCallback farewell_cb,
@@ -1819,9 +1293,6 @@ GNUNET_SOCIAL_host_enter_reconnect (struct GNUNET_SOCIAL_HostConnection *hconn,
   struct GNUNET_SOCIAL_Host *hst = GNUNET_malloc (sizeof (*hst));
   struct GNUNET_SOCIAL_Place *plc = &hst->plc;
 
-  size_t app_id_size = strlen (hconn->app->id) + 1;
-  struct HostEnterRequest *hreq = GNUNET_malloc (sizeof (*hreq) + app_id_size);
-
   hst->enter_cb = enter_cb;
   hst->answer_door_cb = answer_door_cb;
   hst->farewell_cb = farewell_cb;
@@ -1833,29 +1304,23 @@ GNUNET_SOCIAL_host_enter_reconnect (struct GNUNET_SOCIAL_HostConnection *hconn,
   plc->pub_key = hconn->plc_msg.place_pub_key;
   plc->ego_pub_key = hconn->plc_msg.ego_pub_key;
 
-  plc->client = GNUNET_CLIENT_MANAGER_connect (plc->cfg, "social", host_handlers);
-  GNUNET_CLIENT_MANAGER_set_user_context_ (plc->client, hst, sizeof (*plc));
-
-  plc->tmit = GNUNET_PSYC_transmit_create (plc->client);
-  plc->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, plc->slicer);
+  plc->op = GNUNET_OP_create ();
 
-  hst->slicer = GNUNET_SOCIAL_slicer_create ();
-  GNUNET_SOCIAL_slicer_method_add (hst->slicer, "_notice_place_leave",
-                                   host_recv_notice_place_leave_method,
-                                   host_recv_notice_place_leave_modifier,
-                                   NULL, host_recv_notice_place_leave_eom, hst);
-  hst->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, hst->slicer);
+  hst->slicer = GNUNET_PSYC_slicer_create ();
+  GNUNET_PSYC_slicer_method_add (hst->slicer, "_notice_place_leave", NULL,
+                                 host_recv_notice_place_leave_method,
+                                 host_recv_notice_place_leave_modifier,
+                                 NULL, host_recv_notice_place_leave_eom, hst);
 
-  hreq->header.size = htons (sizeof (*hreq) + app_id_size);
-  hreq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_HOST_ENTER);
+  size_t app_id_size = strlen (hconn->app->id) + 1;
+  struct HostEnterRequest *hreq;
+  plc->connect_env = GNUNET_MQ_msg_extra (hreq, app_id_size,
+                                          GNUNET_MESSAGE_TYPE_SOCIAL_HOST_ENTER);
   hreq->place_pub_key = hconn->plc_msg.place_pub_key;
   hreq->ego_pub_key = hconn->plc_msg.ego_pub_key;
-  memcpy (&hreq[1], hconn->app->id, app_id_size);
-
-  plc->connect_msg = &hreq->header;
-  place_send_connect_msg (plc);
+  GNUNET_memcpy (&hreq[1], hconn->app->id, app_id_size);
 
-  GNUNET_free (hconn);
+  host_connect (hst);
   return hst;
 }
 
@@ -1888,6 +1353,7 @@ GNUNET_SOCIAL_host_entry_decision (struct GNUNET_SOCIAL_Host *hst,
                                    int is_admitted,
                                    const struct GNUNET_PSYC_Message *entry_resp)
 {
+  struct GNUNET_SOCIAL_Place *plc = &hst->plc;
   struct GNUNET_PSYC_JoinDecisionMessage *dcsn;
   uint16_t entry_resp_size
     = (NULL != entry_resp) ? ntohs (entry_resp->header.size) : 0;
@@ -1895,16 +1361,16 @@ GNUNET_SOCIAL_host_entry_decision (struct GNUNET_SOCIAL_Host *hst,
   if (GNUNET_MULTICAST_FRAGMENT_MAX_PAYLOAD < sizeof (*dcsn) + entry_resp_size)
     return GNUNET_SYSERR;
 
-  dcsn = GNUNET_malloc (sizeof (*dcsn) + entry_resp_size);
-  dcsn->header.size = htons (sizeof (*dcsn) + entry_resp_size);
-  dcsn->header.type = htons (GNUNET_MESSAGE_TYPE_PSYC_JOIN_DECISION);
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (dcsn, entry_resp_size,
+                               GNUNET_MESSAGE_TYPE_PSYC_JOIN_DECISION);
   dcsn->is_admitted = htonl (is_admitted);
-  dcsn->slave_key = nym->pub_key;
+  dcsn->slave_pub_key = nym->pub_key;
 
   if (0 < entry_resp_size)
-    memcpy (&dcsn[1], entry_resp, entry_resp_size);
+    GNUNET_memcpy (&dcsn[1], entry_resp, entry_resp_size);
 
-  GNUNET_CLIENT_MANAGER_transmit (hst->plc.client, &dcsn->header);
+  GNUNET_MQ_send (plc->mq, env);
   return GNUNET_OK;
 }
 
@@ -1926,14 +1392,17 @@ GNUNET_SOCIAL_host_entry_decision (struct GNUNET_SOCIAL_Host *hst,
 void
 GNUNET_SOCIAL_host_eject (struct GNUNET_SOCIAL_Host *hst,
                           const struct GNUNET_SOCIAL_Nym *nym,
-                          struct GNUNET_ENV_Environment *env)
+                          struct GNUNET_PSYC_Environment *e)
 {
+  struct GNUNET_PSYC_Environment *env = e;
   if (NULL == env)
-    env = GNUNET_ENV_environment_create ();
-  GNUNET_ENV_environment_add (env, GNUNET_ENV_OP_SET,
-                              "_nym", &nym->pub_key, sizeof (nym->pub_key));
+    env = GNUNET_PSYC_env_create ();
+  GNUNET_PSYC_env_add (env, GNUNET_PSYC_OP_SET,
+                       "_nym", &nym->pub_key, sizeof (nym->pub_key));
   GNUNET_SOCIAL_host_announce (hst, "_notice_place_leave", env, NULL, NULL,
                                GNUNET_SOCIAL_ANNOUNCE_NONE);
+  if (NULL == e)
+    GNUNET_PSYC_env_destroy (env);
 }
 
 
@@ -2033,11 +1502,14 @@ GNUNET_SOCIAL_nym_get_pub_key_hash (const struct GNUNET_SOCIAL_Nym *nym)
 struct GNUNET_SOCIAL_Announcement *
 GNUNET_SOCIAL_host_announce (struct GNUNET_SOCIAL_Host *hst,
                              const char *method_name,
-                             const struct GNUNET_ENV_Environment *env,
+                             const struct GNUNET_PSYC_Environment *env,
                              GNUNET_PSYC_TransmitNotifyData notify_data,
                              void *notify_data_cls,
                              enum GNUNET_SOCIAL_AnnounceFlags flags)
 {
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "PSYC_transmit_message for host, method: %s\n",
+              method_name);
   if (GNUNET_OK ==
       GNUNET_PSYC_transmit_message (hst->plc.tmit, method_name, env,
                                     NULL, notify_data, notify_data_cls, flags))
@@ -2089,33 +1561,6 @@ GNUNET_SOCIAL_host_get_place (struct GNUNET_SOCIAL_Host *hst)
 }
 
 
-
-void
-place_leave (struct GNUNET_SOCIAL_Place *plc)
-{
-  struct GNUNET_MessageHeader msg;
-  msg.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_PLACE_LEAVE);
-  msg.size = htons (sizeof (msg));
-  GNUNET_CLIENT_MANAGER_transmit (plc->client, &msg);
-}
-
-
-void
-place_disconnect (struct GNUNET_SOCIAL_Place *plc,
-                  GNUNET_ContinuationCallback disconnect_cb,
-                  void *disconnect_cls)
-{
-  plc->is_disconnecting = GNUNET_YES;
-  plc->disconnect_cb = disconnect_cb;
-  plc->disconnect_cls = disconnect_cls;
-
-  GNUNET_CLIENT_MANAGER_disconnect (plc->client, GNUNET_YES,
-                                    GNUNET_YES == plc->is_host
-                                    ? host_cleanup : guest_cleanup,
-                                    plc);
-}
-
-
 /**
  * Disconnect from a home.
  *
@@ -2129,14 +1574,18 @@ GNUNET_SOCIAL_host_disconnect (struct GNUNET_SOCIAL_Host *hst,
                                GNUNET_ContinuationCallback disconnect_cb,
                                void *cls)
 {
-  place_disconnect (&hst->plc, disconnect_cb, cls);
+  struct GNUNET_SOCIAL_Place *plc = &hst->plc;
+
+  plc->disconnect_cb = disconnect_cb;
+  plc->disconnect_cls = cls;
+  place_disconnect (plc);
 }
 
 
 /**
  * Stop hosting the home.
  *
- * Sends a _notice_place_closed announcement to the home.
+ * Sends a _notice_place_closing announcement to the home.
  * Invalidates host handle.
  *
  * @param hst
@@ -2152,20 +1601,119 @@ GNUNET_SOCIAL_host_disconnect (struct GNUNET_SOCIAL_Host *hst,
  */
 void
 GNUNET_SOCIAL_host_leave (struct GNUNET_SOCIAL_Host *hst,
-                          const struct GNUNET_ENV_Environment *env,
+                          const struct GNUNET_PSYC_Environment *env,
                           GNUNET_ContinuationCallback disconnect_cb,
                           void *cls)
 {
-  GNUNET_SOCIAL_host_announce (hst, "_notice_place_closed", env, NULL, NULL,
+  struct GNUNET_MQ_Envelope *envelope;
+
+  GNUNET_SOCIAL_host_announce (hst, "_notice_place_closing", env, NULL, NULL,
                                GNUNET_SOCIAL_ANNOUNCE_NONE);
-  place_leave (&hst->plc);
-  GNUNET_SOCIAL_host_disconnect (hst, disconnect_cb, cls);
+  hst->plc.disconnect_cb = disconnect_cb;
+  hst->plc.disconnect_cls = cls;
+  envelope = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SOCIAL_PLACE_LEAVE);
+  GNUNET_MQ_send (hst->plc.mq,
+                  envelope);
 }
 
 
 /*** GUEST ***/
 
-static struct GuestEnterRequest *
+
+static void
+guest_connect (struct GNUNET_SOCIAL_Guest *gst);
+
+
+static void
+guest_reconnect (void *cls)
+{
+  guest_connect (cls);
+}
+
+
+/**
+ * Guest client disconnected from service.
+ *
+ * Reconnect after backoff period.
+ */
+static void
+guest_disconnected (void *cls, enum GNUNET_MQ_Error error)
+{
+  struct GNUNET_SOCIAL_Guest *gst = cls;
+  struct GNUNET_SOCIAL_Place *plc = &gst->plc;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Guest client disconnected (%d), re-connecting\n",
+       (int) error);
+  if (NULL != plc->tmit)
+  {
+    GNUNET_PSYC_transmit_destroy (plc->tmit);
+    plc->tmit = NULL;
+  }
+  if (NULL != plc->mq)
+  {
+    GNUNET_MQ_destroy (plc->mq);
+    plc->mq = NULL;
+  }
+
+  plc->reconnect_task = GNUNET_SCHEDULER_add_delayed (plc->reconnect_delay,
+                                                      guest_reconnect,
+                                                      gst);
+  plc->reconnect_delay = GNUNET_TIME_STD_BACKOFF (plc->reconnect_delay);
+}
+
+
+static void
+guest_connect (struct GNUNET_SOCIAL_Guest *gst)
+{
+  struct GNUNET_SOCIAL_Place *plc = &gst->plc;
+
+  struct GNUNET_MQ_MessageHandler handlers[] = {
+    GNUNET_MQ_hd_fixed_size (guest_enter_ack,
+                             GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER_ACK,
+                             struct GNUNET_PSYC_CountersResultMessage,
+                             gst),
+    GNUNET_MQ_hd_fixed_size (place_leave_ack,
+                             GNUNET_MESSAGE_TYPE_SOCIAL_PLACE_LEAVE_ACK,
+                             struct GNUNET_MessageHeader,
+                             plc),
+    GNUNET_MQ_hd_var_size (guest_enter_decision,
+                           GNUNET_MESSAGE_TYPE_PSYC_JOIN_DECISION,
+                           struct GNUNET_PSYC_JoinDecisionMessage,
+                           gst),
+    GNUNET_MQ_hd_var_size (place_message,
+                           GNUNET_MESSAGE_TYPE_PSYC_MESSAGE,
+                           struct GNUNET_PSYC_MessageHeader,
+                           plc),
+    GNUNET_MQ_hd_fixed_size (place_message_ack,
+                             GNUNET_MESSAGE_TYPE_PSYC_MESSAGE_ACK,
+                             struct GNUNET_MessageHeader,
+                             plc),
+    GNUNET_MQ_hd_var_size (place_history_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_HISTORY_RESULT,
+                           struct GNUNET_OperationResultMessage,
+                           plc),
+    GNUNET_MQ_hd_var_size (place_state_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_STATE_RESULT,
+                           struct GNUNET_OperationResultMessage,
+                           plc),
+    GNUNET_MQ_hd_var_size (place_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_RESULT_CODE,
+                           struct GNUNET_OperationResultMessage,
+                           plc),
+    GNUNET_MQ_handler_end ()
+  };
+
+  plc->mq = GNUNET_CLIENT_connect (plc->cfg, "social",
+                                   handlers, guest_disconnected, gst);
+  GNUNET_assert (NULL != plc->mq);
+  plc->tmit = GNUNET_PSYC_transmit_create (plc->mq);
+
+  GNUNET_MQ_send_copy (plc->mq, plc->connect_env);
+}
+
+
+static struct GNUNET_MQ_Envelope *
 guest_enter_request_create (const char *app_id,
                             const struct GNUNET_CRYPTO_EcdsaPublicKey *ego_pub_key,
                             const struct GNUNET_CRYPTO_EddsaPublicKey *place_pub_key,
@@ -2178,28 +1726,27 @@ guest_enter_request_create (const char *app_id,
   uint16_t join_msg_size = ntohs (join_msg->header.size);
   uint16_t relay_size = relay_count * sizeof (*relays);
 
-  struct GuestEnterRequest *
-    greq = GNUNET_malloc (sizeof (*greq) + app_id_size + relay_size + join_msg_size);
-
-  greq->header.size = htons (sizeof (*greq) + app_id_size + relay_size + join_msg_size);
-  greq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER);
+  struct GuestEnterRequest *greq;
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (greq, app_id_size + relay_size + join_msg_size,
+                               GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER);
   greq->place_pub_key = *place_pub_key;
   greq->ego_pub_key = *ego_pub_key;
   greq->origin = *origin;
   greq->relay_count = htonl (relay_count);
 
   char *p = (char *) &greq[1];
-  memcpy (p, app_id, app_id_size);
+  GNUNET_memcpy (p, app_id, app_id_size);
   p += app_id_size;
 
   if (0 < relay_size)
   {
-    memcpy (p, relays, relay_size);
+    GNUNET_memcpy (p, relays, relay_size);
     p += relay_size;
   }
 
-  memcpy (p, join_msg, join_msg_size);
-  return greq;
+  GNUNET_memcpy (p, join_msg, join_msg_size);
+  return env;
 }
 
 
@@ -2242,7 +1789,7 @@ GNUNET_SOCIAL_guest_enter (const struct GNUNET_SOCIAL_App *app,
                            uint32_t relay_count,
                            const struct GNUNET_PeerIdentity *relays,
                            const struct GNUNET_PSYC_Message *entry_msg,
-                           struct GNUNET_SOCIAL_Slicer *slicer,
+                           struct GNUNET_PSYC_Slicer *slicer,
                            GNUNET_SOCIAL_GuestEnterCallback local_enter_cb,
                            GNUNET_SOCIAL_EntryDecisionCallback entry_dcsn_cb,
                            void *cls)
@@ -2253,24 +1800,20 @@ GNUNET_SOCIAL_guest_enter (const struct GNUNET_SOCIAL_App *app,
   plc->ego_pub_key = ego->pub_key;
   plc->pub_key = *place_pub_key;
   plc->cfg = app->cfg;
-  plc->is_host = GNUNET_YES;
+  plc->is_host = GNUNET_NO;
   plc->slicer = slicer;
 
+  plc->op = GNUNET_OP_create ();
+
+  plc->connect_env
+    = guest_enter_request_create (app->id, &ego->pub_key, &plc->pub_key,
+                                  origin, relay_count, relays, entry_msg);
+
   gst->enter_cb = local_enter_cb;
   gst->entry_dcsn_cb = entry_dcsn_cb;
   gst->cb_cls = cls;
 
-  plc->client = GNUNET_CLIENT_MANAGER_connect (plc->cfg, "social", guest_handlers);
-  GNUNET_CLIENT_MANAGER_set_user_context_ (plc->client, gst, sizeof (*plc));
-
-  plc->tmit = GNUNET_PSYC_transmit_create (plc->client);
-  plc->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, plc->slicer);
-
-  struct GuestEnterRequest *
-    greq = guest_enter_request_create (app->id, &ego->pub_key, &plc->pub_key,
-                                       origin, relay_count, relays, entry_msg);
-  plc->connect_msg = &greq->header;
-  place_send_connect_msg (plc);
+  guest_connect (gst);
   return gst;
 }
 
@@ -2307,7 +1850,7 @@ GNUNET_SOCIAL_guest_enter_by_name (const struct GNUNET_SOCIAL_App *app,
                                    const char *gns_name,
                                    const char *password,
                                    const struct GNUNET_PSYC_Message *join_msg,
-                                   struct GNUNET_SOCIAL_Slicer *slicer,
+                                   struct GNUNET_PSYC_Slicer *slicer,
                                    GNUNET_SOCIAL_GuestEnterCallback local_enter_cb,
                                    GNUNET_SOCIAL_EntryDecisionCallback entry_decision_cb,
                                    void *cls)
@@ -2323,48 +1866,101 @@ GNUNET_SOCIAL_guest_enter_by_name (const struct GNUNET_SOCIAL_App *app,
   uint16_t password_size = strlen (password) + 1;
 
   uint16_t join_msg_size = 0;
-  if (NULL != join_msg);
+  if (NULL != join_msg)
     join_msg_size = ntohs (join_msg->header.size);
 
-  uint16_t greq_size = sizeof (struct GuestEnterByNameRequest)
-    + app_id_size + gns_name_size + password_size + join_msg_size;
-  struct GuestEnterByNameRequest *greq = GNUNET_malloc (greq_size);
-  greq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER_BY_NAME);
-  greq->header.size = htons (greq_size);
+  struct GuestEnterByNameRequest *greq;
+  plc->connect_env
+    = GNUNET_MQ_msg_extra (greq, app_id_size + gns_name_size
+                           + password_size + join_msg_size,
+                           GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER_BY_NAME);
+
   greq->ego_pub_key = ego->pub_key;
 
   char *p = (char *) &greq[1];
-  memcpy (p, app->id, app_id_size);
+  GNUNET_memcpy (p, app->id, app_id_size);
   p += app_id_size;
-  memcpy (p, gns_name, gns_name_size);
+  GNUNET_memcpy (p, gns_name, gns_name_size);
   p += gns_name_size;
-  memcpy (p, password, password_size);
+  GNUNET_memcpy (p, password, password_size);
   p += password_size;
   if (NULL != join_msg)
-    memcpy (p, join_msg, join_msg_size);
-
-  gst->enter_cb = local_enter_cb;
-  gst->entry_dcsn_cb = entry_decision_cb;
-  gst->cb_cls = cls;
+    GNUNET_memcpy (p, join_msg, join_msg_size);
 
   plc->ego_pub_key = ego->pub_key;
   plc->cfg = app->cfg;
   plc->is_host = GNUNET_NO;
   plc->slicer = slicer;
 
-  plc->client = GNUNET_CLIENT_MANAGER_connect (app->cfg, "social", guest_handlers);
-  GNUNET_CLIENT_MANAGER_set_user_context_ (plc->client, gst, sizeof (*plc));
-
-  plc->tmit = GNUNET_PSYC_transmit_create (plc->client);
-  plc->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, plc->slicer);
+  plc->op = GNUNET_OP_create ();
 
-  plc->connect_msg = &greq->header;
-  place_send_connect_msg (plc);
+  gst->enter_cb = local_enter_cb;
+  gst->entry_dcsn_cb = entry_decision_cb;
+  gst->cb_cls = cls;
 
+  guest_connect (gst);
   return gst;
 }
 
 
+struct ReconnectContext
+{
+  struct GNUNET_SOCIAL_Guest *guest;
+  int *result;
+  int64_t *max_message_id;
+  GNUNET_SOCIAL_GuestEnterCallback enter_cb;
+  void *enter_cls;
+};
+
+
+static void
+guest_enter_reconnect_cb (void *cls,
+                          int result,
+                          const struct GNUNET_CRYPTO_EddsaPublicKey *place_pub_key,
+                          uint64_t max_message_id)
+{
+  struct ReconnectContext *reconnect_ctx = cls;
+
+  GNUNET_assert (NULL != reconnect_ctx);
+  reconnect_ctx->result = GNUNET_new (int);
+  *(reconnect_ctx->result) = result; 
+  reconnect_ctx->max_message_id = GNUNET_new (int64_t);
+  *(reconnect_ctx->max_message_id) = max_message_id;
+}
+
+
+static void
+guest_entry_dcsn_reconnect_cb (void *cls,
+                               int is_admitted,
+                               const struct GNUNET_PSYC_Message *entry_resp)
+{
+  struct ReconnectContext *reconnect_ctx = cls;
+  struct GNUNET_SOCIAL_Guest *gst = reconnect_ctx->guest;
+
+  GNUNET_assert (NULL != reconnect_ctx);
+  GNUNET_assert (NULL != reconnect_ctx->result);
+  GNUNET_assert (NULL != reconnect_ctx->max_message_id);
+  if (GNUNET_YES != is_admitted)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Guest was rejected after calling "
+                "GNUNET_SOCIAL_guest_enter_reconnect ()\n");
+  }
+  else if (NULL != reconnect_ctx->enter_cb)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "guest reconnected!\n");
+    reconnect_ctx->enter_cb (reconnect_ctx->enter_cls,
+                             *(reconnect_ctx->result),
+                             &gst->plc.pub_key,
+                             *(reconnect_ctx->max_message_id));
+  }
+  GNUNET_free (reconnect_ctx->result);
+  GNUNET_free (reconnect_ctx->max_message_id);
+  GNUNET_free (reconnect_ctx);
+}
+
+
 /**
  * Reconnect to an already entered place as guest.
  *
@@ -2375,8 +1971,8 @@ GNUNET_SOCIAL_guest_enter_by_name (const struct GNUNET_SOCIAL_App *app,
  *        Flags for the entry.
  * @param slicer
  *        Slicer to use for processing incoming requests from guests.
- * @param local_enter_cb
- *        Called upon connection established to the social service.
+ * @param enter_cb
+ *        Called upon re-entering is complete.
  * @param entry_decision_cb
  *        Called upon receiving entry decision.
  *
@@ -2385,26 +1981,24 @@ GNUNET_SOCIAL_guest_enter_by_name (const struct GNUNET_SOCIAL_App *app,
 struct GNUNET_SOCIAL_Guest *
 GNUNET_SOCIAL_guest_enter_reconnect (struct GNUNET_SOCIAL_GuestConnection *gconn,
                                      enum GNUNET_PSYC_SlaveJoinFlags flags,
-                                     struct GNUNET_SOCIAL_Slicer *slicer,
-                                     GNUNET_SOCIAL_GuestEnterCallback local_enter_cb,
+                                     struct GNUNET_PSYC_Slicer *slicer,
+                                     GNUNET_SOCIAL_GuestEnterCallback enter_cb,
                                      void *cls)
 {
   struct GNUNET_SOCIAL_Guest *gst = GNUNET_malloc (sizeof (*gst));
   struct GNUNET_SOCIAL_Place *plc = &gst->plc;
+  struct ReconnectContext *reconnect_ctx;
 
   uint16_t app_id_size = strlen (gconn->app->id) + 1;
-  uint16_t greq_size = sizeof (struct GuestEnterRequest) + app_id_size;
-  struct GuestEnterRequest *greq = GNUNET_malloc (greq_size);
-  greq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER);
-  greq->header.size = htons (greq_size);
+  struct GuestEnterRequest *greq;
+  plc->connect_env
+    = GNUNET_MQ_msg_extra (greq, app_id_size,
+                           GNUNET_MESSAGE_TYPE_SOCIAL_GUEST_ENTER);
   greq->ego_pub_key = gconn->plc_msg.ego_pub_key;
   greq->place_pub_key = gconn->plc_msg.place_pub_key;
   greq->flags = htonl (flags);
 
-  memcpy (&greq[1], gconn->app->id, app_id_size);
-
-  gst->enter_cb = local_enter_cb;
-  gst->cb_cls = cls;
+  GNUNET_memcpy (&greq[1], gconn->app->id, app_id_size);
 
   plc->cfg = gconn->app->cfg;
   plc->is_host = GNUNET_NO;
@@ -2412,16 +2006,17 @@ GNUNET_SOCIAL_guest_enter_reconnect (struct GNUNET_SOCIAL_GuestConnection *gconn
   plc->pub_key = gconn->plc_msg.place_pub_key;
   plc->ego_pub_key = gconn->plc_msg.ego_pub_key;
 
-  plc->client = GNUNET_CLIENT_MANAGER_connect (plc->cfg, "social", guest_handlers);
-  GNUNET_CLIENT_MANAGER_set_user_context_ (plc->client, gst, sizeof (*plc));
+  reconnect_ctx = GNUNET_new (struct ReconnectContext);
+  reconnect_ctx->guest = gst;
+  reconnect_ctx->enter_cb = enter_cb;
+  reconnect_ctx->enter_cls = cls;
 
-  plc->tmit = GNUNET_PSYC_transmit_create (plc->client);
-  plc->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, plc->slicer);
+  plc->op = GNUNET_OP_create ();
+  gst->enter_cb = &guest_enter_reconnect_cb;
+  gst->entry_dcsn_cb = &guest_entry_dcsn_reconnect_cb;
+  gst->cb_cls = reconnect_ctx;
 
-  plc->connect_msg = &greq->header;
-  place_send_connect_msg (plc);
-
-  GNUNET_free (gconn);
+  guest_connect (gst);
   return gst;
 }
 
@@ -2448,7 +2043,7 @@ GNUNET_SOCIAL_guest_enter_reconnect (struct GNUNET_SOCIAL_GuestConnection *gconn
 struct GNUNET_SOCIAL_TalkRequest *
 GNUNET_SOCIAL_guest_talk (struct GNUNET_SOCIAL_Guest *gst,
                           const char *method_name,
-                          const struct GNUNET_ENV_Environment *env,
+                          const struct GNUNET_PSYC_Environment *env,
                           GNUNET_PSYC_TransmitNotifyData notify_data,
                           void *notify_data_cls,
                           enum GNUNET_SOCIAL_TalkFlags flags)
@@ -2504,7 +2099,11 @@ GNUNET_SOCIAL_guest_disconnect (struct GNUNET_SOCIAL_Guest *gst,
                                 GNUNET_ContinuationCallback disconnect_cb,
                                 void *cls)
 {
-  place_disconnect (&gst->plc, disconnect_cb, cls);
+  struct GNUNET_SOCIAL_Place *plc = &gst->plc;
+
+  plc->disconnect_cb = disconnect_cb;
+  plc->disconnect_cls = cls;
+  place_disconnect (plc);
 }
 
 
@@ -2526,14 +2125,19 @@ GNUNET_SOCIAL_guest_disconnect (struct GNUNET_SOCIAL_Guest *gst,
  */
 void
 GNUNET_SOCIAL_guest_leave (struct GNUNET_SOCIAL_Guest *gst,
-                           struct GNUNET_ENV_Environment *env,
+                           struct GNUNET_PSYC_Environment *env,
                            GNUNET_ContinuationCallback disconnect_cb,
                            void *cls)
 {
+  struct GNUNET_MQ_Envelope *envelope;
+
   GNUNET_SOCIAL_guest_talk (gst, "_notice_place_leave", env, NULL, NULL,
                             GNUNET_SOCIAL_TALK_NONE);
-  place_leave (&gst->plc);
-  GNUNET_SOCIAL_guest_disconnect (gst, disconnect_cb, cls);
+  gst->plc.disconnect_cb = disconnect_cb;
+  gst->plc.disconnect_cls = cls;
+  envelope = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SOCIAL_PLACE_LEAVE);
+  GNUNET_MQ_send (gst->plc.mq,
+                  envelope);
 }
 
 
@@ -2562,12 +2166,58 @@ GNUNET_SOCIAL_guest_get_place (struct GNUNET_SOCIAL_Guest *gst)
  * @return Public key of the place.
  */
 const struct GNUNET_CRYPTO_EddsaPublicKey *
-GNUNET_SOCIAL_place_get_key (struct GNUNET_SOCIAL_Place *plc)
+GNUNET_SOCIAL_place_get_pub_key (const struct GNUNET_SOCIAL_Place *plc)
 {
   return &plc->pub_key;
 }
 
 
+/**
+ * Set message processing @a flags for a @a method_prefix.
+ *
+ * @param plc
+ *        Place.
+ * @param method_prefix
+ *        Method prefix @a flags apply to.
+ * @param flags
+ *        The flags that apply to a matching @a method_prefix.
+ */
+void
+GNUNET_SOCIAL_place_msg_proc_set (struct GNUNET_SOCIAL_Place *plc,
+                                  const char *method_prefix,
+                                  enum GNUNET_SOCIAL_MsgProcFlags flags)
+{
+  GNUNET_assert (NULL != method_prefix);
+  struct MsgProcRequest *mpreq;
+  uint16_t method_size = strnlen (method_prefix,
+                                  GNUNET_MAX_MESSAGE_SIZE
+                                  - sizeof (*mpreq)) + 1;
+  GNUNET_assert ('\0' == method_prefix[method_size - 1]);
+
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (mpreq, method_size,
+                               GNUNET_MESSAGE_TYPE_SOCIAL_MSG_PROC_SET);
+  mpreq->flags = htonl (flags);
+  GNUNET_memcpy (&mpreq[1], method_prefix, method_size);
+
+  GNUNET_MQ_send (plc->mq, env);
+}
+
+
+/**
+ * Clear all message processing flags previously set for this place.
+ */
+void
+GNUNET_SOCIAL_place_msg_proc_clear (struct GNUNET_SOCIAL_Place *plc)
+{
+  struct GNUNET_MessageHeader *req;
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg (req, GNUNET_MESSAGE_TYPE_SOCIAL_MSG_PROC_CLEAR);
+
+  GNUNET_MQ_send (plc->mq, env);
+}
+
+
 static struct GNUNET_SOCIAL_HistoryRequest *
 place_history_replay (struct GNUNET_SOCIAL_Place *plc,
                       uint64_t start_message_id,
@@ -2575,35 +2225,35 @@ place_history_replay (struct GNUNET_SOCIAL_Place *plc,
                       uint64_t message_limit,
                       const char *method_prefix,
                       uint32_t flags,
-                      struct GNUNET_SOCIAL_Slicer *slicer,
+                      struct GNUNET_PSYC_Slicer *slicer,
                       GNUNET_ResultCallback result_cb,
                       void *cls)
 {
   struct GNUNET_PSYC_HistoryRequestMessage *req;
   struct GNUNET_SOCIAL_HistoryRequest *hist = GNUNET_malloc (sizeof (*hist));
   hist->plc = plc;
-  hist->recv = GNUNET_PSYC_receive_create (NULL, slicer_message, slicer);
+  hist->slicer = slicer;
   hist->result_cb = result_cb;
   hist->cls = cls;
-  hist->op_id = GNUNET_CLIENT_MANAGER_op_add (plc->client,
-                                              &op_recv_history_result, hist);
+  hist->op_id = GNUNET_OP_add (plc->op, op_recv_history_result, hist, NULL);
 
   GNUNET_assert (NULL != method_prefix);
   uint16_t method_size = strnlen (method_prefix,
-                                  GNUNET_SERVER_MAX_MESSAGE_SIZE
+                                  GNUNET_MAX_MESSAGE_SIZE
                                   - sizeof (*req)) + 1;
   GNUNET_assert ('\0' == method_prefix[method_size - 1]);
-  req = GNUNET_malloc (sizeof (*req) + method_size);
-  req->header.type = htons (GNUNET_MESSAGE_TYPE_PSYC_HISTORY_REPLAY);
-  req->header.size = htons (sizeof (*req) + method_size);
+
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (req, method_size,
+                               GNUNET_MESSAGE_TYPE_PSYC_HISTORY_REPLAY);
   req->start_message_id = GNUNET_htonll (start_message_id);
   req->end_message_id = GNUNET_htonll (end_message_id);
   req->message_limit = GNUNET_htonll (message_limit);
   req->flags = htonl (flags);
   req->op_id = GNUNET_htonll (hist->op_id);
-  memcpy (&req[1], method_prefix, method_size);
+  GNUNET_memcpy (&req[1], method_prefix, method_size);
 
-  GNUNET_CLIENT_MANAGER_transmit (plc->client, &req->header);
+  GNUNET_MQ_send (plc->mq, env);
   return hist;
 }
 
@@ -2638,7 +2288,7 @@ GNUNET_SOCIAL_place_history_replay (struct GNUNET_SOCIAL_Place *plc,
                                     uint64_t end_message_id,
                                     const char *method_prefix,
                                     uint32_t flags,
-                                    struct GNUNET_SOCIAL_Slicer *slicer,
+                                    struct GNUNET_PSYC_Slicer *slicer,
                                     GNUNET_ResultCallback result_cb,
                                     void *cls)
 {
@@ -2674,7 +2324,7 @@ GNUNET_SOCIAL_place_history_replay_latest (struct GNUNET_SOCIAL_Place *plc,
                                            uint64_t message_limit,
                                            const char *method_prefix,
                                            uint32_t flags,
-                                           struct GNUNET_SOCIAL_Slicer *slicer,
+                                           struct GNUNET_PSYC_Slicer *slicer,
                                            GNUNET_ResultCallback result_cb,
                                            void *cls)
 {
@@ -2692,8 +2342,7 @@ GNUNET_SOCIAL_place_history_replay_latest (struct GNUNET_SOCIAL_Place *plc,
 void
 GNUNET_SOCIAL_place_history_replay_cancel (struct GNUNET_SOCIAL_HistoryRequest *hist)
 {
-  GNUNET_PSYC_receive_destroy (hist->recv);
-  GNUNET_CLIENT_MANAGER_op_cancel (hist->plc->client, hist->op_id);
+  GNUNET_OP_remove (hist->plc->op, hist->op_id);
   GNUNET_free (hist);
 }
 
@@ -2713,19 +2362,17 @@ place_state_get (struct GNUNET_SOCIAL_Place *plc,
   look->var_cb = var_cb;
   look->result_cb = result_cb;
   look->cls = cls;
-  look->op_id = GNUNET_CLIENT_MANAGER_op_add (plc->client,
-                                              &op_recv_state_result, look);
+  look->op_id = GNUNET_OP_add (plc->op, &op_recv_state_result, look, NULL);
 
   GNUNET_assert (NULL != name);
-  size_t name_size = strnlen (name, GNUNET_SERVER_MAX_MESSAGE_SIZE
+  size_t name_size = strnlen (name, GNUNET_MAX_MESSAGE_SIZE
                               - sizeof (*req)) + 1;
-  req = GNUNET_malloc (sizeof (*req) + name_size);
-  req->header.type = htons (type);
-  req->header.size = htons (sizeof (*req) + name_size);
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (req, name_size, type);
   req->op_id = GNUNET_htonll (look->op_id);
-  memcpy (&req[1], name, name_size);
+  GNUNET_memcpy (&req[1], name, name_size);
 
-  GNUNET_CLIENT_MANAGER_transmit (plc->client, &req->header);
+  GNUNET_MQ_send (plc->mq, env);
   return look;
 }
 
@@ -2792,7 +2439,7 @@ GNUNET_SOCIAL_place_look_for (struct GNUNET_SOCIAL_Place *plc,
 void
 GNUNET_SOCIAL_place_look_cancel (struct GNUNET_SOCIAL_LookHandle *look)
 {
-  GNUNET_CLIENT_MANAGER_op_cancel (look->plc->client, look->op_id);
+  GNUNET_OP_remove (look->plc->op, look->op_id);
   GNUNET_free (look);
 }
 
@@ -2808,7 +2455,6 @@ op_recv_zone_add_place_result (void *cls, int64_t result,
   if (NULL != add_plc->result_cb)
     add_plc->result_cb (add_plc->result_cls, result, err_msg, err_msg_size);
 
-  GNUNET_free (add_plc->req);
   GNUNET_free (add_plc);
 }
 
@@ -2858,14 +2504,14 @@ GNUNET_SOCIAL_zone_add_place (const struct GNUNET_SOCIAL_App *app,
   size_t name_size = strlen (name) + 1;
   size_t password_size = strlen (password) + 1;
   size_t relay_size = relay_count * sizeof (*relays);
-  size_t preq_size = sizeof (*preq) + name_size + password_size + relay_size;
+  size_t payload_size = name_size + password_size + relay_size;
 
-  if (GNUNET_SERVER_MAX_MESSAGE_SIZE < preq_size)
+  if (GNUNET_MAX_MESSAGE_SIZE < sizeof (*preq) + payload_size)
     return GNUNET_SYSERR;
 
-  preq = GNUNET_malloc (preq_size);
-  preq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_ZONE_ADD_PLACE);
-  preq->header.size = htons (preq_size);
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (preq, payload_size,
+                               GNUNET_MESSAGE_TYPE_SOCIAL_ZONE_ADD_PLACE);
   preq->expiration_time = GNUNET_htonll (expiration_time.abs_value_us);
   preq->ego_pub_key = ego->pub_key;
   preq->place_pub_key = *place_pub_key;
@@ -2873,21 +2519,21 @@ GNUNET_SOCIAL_zone_add_place (const struct GNUNET_SOCIAL_App *app,
   preq->relay_count = htonl (relay_count);
 
   char *p = (char *) &preq[1];
-  memcpy (p, name, name_size);
+  GNUNET_memcpy (p, name, name_size);
   p += name_size;
-  memcpy (p, password, password_size);
+  GNUNET_memcpy (p, password, password_size);
   p += password_size;
-  memcpy (p, relays, relay_size);
+  GNUNET_memcpy (p, relays, relay_size);
 
   struct ZoneAddPlaceHandle * add_plc = GNUNET_malloc (sizeof (*add_plc));
-  add_plc->req = preq;
   add_plc->result_cb = result_cb;
   add_plc->result_cls = result_cls;
 
-  preq->op_id = GNUNET_htonll (GNUNET_CLIENT_MANAGER_op_add (app->client,
-                                                             op_recv_zone_add_place_result,
-                                                             add_plc));
-  GNUNET_CLIENT_MANAGER_transmit_now (app->client, &preq->header);
+  preq->op_id = GNUNET_htonll (GNUNET_OP_add (app->op,
+                                              op_recv_zone_add_place_result,
+                                              add_plc, NULL));
+
+  GNUNET_MQ_send (app->mq, env);
   return GNUNET_OK;
 }
 
@@ -2903,7 +2549,6 @@ op_recv_zone_add_nym_result (void *cls, int64_t result,
   if (NULL != add_nym->result_cb)
     add_nym->result_cb (add_nym->result_cls, result, err_msg, err_msg_size);
 
-  GNUNET_free (add_nym->req);
   GNUNET_free (add_nym);
 }
 
@@ -2941,30 +2586,104 @@ GNUNET_SOCIAL_zone_add_nym (const struct GNUNET_SOCIAL_App *app,
   struct ZoneAddNymRequest *nreq;
 
   size_t name_size = strlen (name) + 1;
-  if (GNUNET_SERVER_MAX_MESSAGE_SIZE < sizeof (*nreq) + name_size)
+  if (GNUNET_MAX_MESSAGE_SIZE < sizeof (*nreq) + name_size)
     return GNUNET_SYSERR;
 
-  nreq = GNUNET_malloc (sizeof (*nreq) + name_size);
-  nreq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_ZONE_ADD_NYM);
-  nreq->header.size = htons (sizeof (*nreq) + name_size);
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg_extra (nreq, name_size,
+                               GNUNET_MESSAGE_TYPE_SOCIAL_ZONE_ADD_NYM);
   nreq->expiration_time = GNUNET_htonll (expiration_time.abs_value_us);
   nreq->ego_pub_key = ego->pub_key;
   nreq->nym_pub_key = *nym_pub_key;
-  memcpy (&nreq[1], name, name_size);
+  GNUNET_memcpy (&nreq[1], name, name_size);
 
-  struct ZoneAddNymHandle * add_nym = GNUNET_malloc (sizeof (*add_nym));
-  add_nym->req = nreq;
+  struct ZoneAddNymHandle *add_nym = GNUNET_malloc (sizeof (*add_nym));
   add_nym->result_cb = result_cb;
   add_nym->result_cls = result_cls;
 
-  nreq->op_id = GNUNET_htonll (GNUNET_CLIENT_MANAGER_op_add (app->client,
-                                                             op_recv_zone_add_nym_result,
-                                                             add_nym));
-  GNUNET_CLIENT_MANAGER_transmit_now (app->client, &nreq->header);
+  nreq->op_id = GNUNET_htonll (GNUNET_OP_add (app->op,
+                                              op_recv_zone_add_nym_result,
+                                              add_nym, NULL));
+
+  GNUNET_MQ_send (app->mq, env);
   return GNUNET_OK;
 }
 
 
+/*** APP ***/
+
+
+static void
+app_connect (struct GNUNET_SOCIAL_App *app);
+
+
+static void
+app_reconnect (void *cls)
+{
+  app_connect (cls);
+}
+
+
+/**
+ * App client disconnected from service.
+ *
+ * Reconnect after backoff period.
+ */
+static void
+app_disconnected (void *cls, enum GNUNET_MQ_Error error)
+{
+  struct GNUNET_SOCIAL_App *app = cls;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "App client disconnected (%d), re-connecting\n",
+       (int) error);
+  if (NULL != app->mq)
+  {
+    GNUNET_MQ_destroy (app->mq);
+    app->mq = NULL;
+  }
+
+  app->reconnect_task = GNUNET_SCHEDULER_add_delayed (app->reconnect_delay,
+                                                      app_reconnect,
+                                                      app);
+  app->reconnect_delay = GNUNET_TIME_STD_BACKOFF (app->reconnect_delay);
+}
+
+
+static void
+app_connect (struct GNUNET_SOCIAL_App *app)
+{
+  struct GNUNET_MQ_MessageHandler handlers[] = {
+    GNUNET_MQ_hd_var_size (app_ego,
+                           GNUNET_MESSAGE_TYPE_SOCIAL_APP_EGO,
+                           struct AppEgoMessage,
+                           app),
+    GNUNET_MQ_hd_fixed_size (app_ego_end,
+                             GNUNET_MESSAGE_TYPE_SOCIAL_APP_EGO_END,
+                             struct GNUNET_MessageHeader,
+                             app),
+    GNUNET_MQ_hd_var_size (app_place,
+                           GNUNET_MESSAGE_TYPE_SOCIAL_APP_PLACE,
+                           struct AppPlaceMessage,
+                           app),
+    GNUNET_MQ_hd_fixed_size (app_place_end,
+                             GNUNET_MESSAGE_TYPE_SOCIAL_APP_PLACE_END,
+                             struct GNUNET_MessageHeader,
+                             app),
+    GNUNET_MQ_hd_var_size (app_result,
+                           GNUNET_MESSAGE_TYPE_PSYC_RESULT_CODE,
+                           struct GNUNET_OperationResultMessage,
+                           app),
+    GNUNET_MQ_handler_end ()
+  };
+
+  app->mq = GNUNET_CLIENT_connect (app->cfg, "social",
+                                   handlers, app_disconnected, app);
+  GNUNET_assert (NULL != app->mq);
+  GNUNET_MQ_send_copy (app->mq, app->connect_env);
+}
+
+
 /**
  * Connect application to the social service.
  *
@@ -2976,11 +2695,13 @@ GNUNET_SOCIAL_zone_add_nym (const struct GNUNET_SOCIAL_App *app,
  *        Configuration.
  * @param id
  *        Application ID.
- * @param notify_host
+ * @param ego_cb
+ *        Function to notify about an available ego.
+ * @param host_cb
  *        Function to notify about a place entered as host.
- * @param notify_guest
- *        Function to notify about a place entered as guest..
- * @param notify_cls
+ * @param guest_cb
+ *        Function to notify about a place entered as guest.
+ * @param cls
  *        Closure for the callbacks.
  *
  * @return Handle that can be used to stop listening.
@@ -2991,6 +2712,7 @@ GNUNET_SOCIAL_app_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
                            GNUNET_SOCIAL_AppEgoCallback ego_cb,
                            GNUNET_SOCIAL_AppHostPlaceCallback host_cb,
                            GNUNET_SOCIAL_AppGuestPlaceCallback guest_cb,
+                           GNUNET_SOCIAL_AppConnectedCallback connected_cb,
                            void *cls)
 {
   uint16_t app_id_size = strnlen (id, GNUNET_SOCIAL_APP_MAX_ID_SIZE);
@@ -3003,37 +2725,75 @@ GNUNET_SOCIAL_app_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
   app->ego_cb = ego_cb;
   app->host_cb = host_cb;
   app->guest_cb = guest_cb;
+  app->connected_cb = connected_cb;
   app->cb_cls = cls;
   app->egos = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_NO);
-  app->client = GNUNET_CLIENT_MANAGER_connect (cfg, "social",
-                                               app_handlers);
-  GNUNET_CLIENT_MANAGER_set_user_context_ (app->client, app, sizeof (*app));
-
+  app->op = GNUNET_OP_create ();
   app->id = GNUNET_malloc (app_id_size);
-  memcpy (app->id, id, app_id_size);
+  GNUNET_memcpy (app->id, id, app_id_size);
 
-  struct AppConnectRequest *creq = GNUNET_malloc (sizeof (*creq) + app_id_size);
-  creq->header.size = htons (sizeof (*creq) + app_id_size);
-  creq->header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_APP_CONNECT);
-  memcpy (&creq[1], app->id, app_id_size);
-
-  app->connect_msg = &creq->header;
-  app_send_connect_msg (app);
+  struct AppConnectRequest *creq;
+  app->connect_env = GNUNET_MQ_msg_extra (creq, app_id_size,
+                                          GNUNET_MESSAGE_TYPE_SOCIAL_APP_CONNECT);
+  GNUNET_memcpy (&creq[1], app->id, app_id_size);
 
+  app_connect (app);
   return app;
 }
 
 
+static void
+app_cleanup (struct GNUNET_SOCIAL_App *app)
+{
+  if (NULL != app->mq)
+  {
+    GNUNET_MQ_destroy (app->mq);
+    app->mq = NULL;
+  }
+  if (NULL != app->disconnect_cb)
+  {
+    app->disconnect_cb (app->disconnect_cls);
+    app->disconnect_cb = NULL;
+  }
+  GNUNET_free (app);
+}
+
 /**
  * Disconnect application.
  *
  * @param app
  *        Application handle.
+ * @param disconnect_cb
+ *        Disconnect callback.
+ * @param disconnect_cls
+ *        Disconnect closure.
  */
 void
-GNUNET_SOCIAL_app_disconnect (struct GNUNET_SOCIAL_App *app)
+GNUNET_SOCIAL_app_disconnect (struct GNUNET_SOCIAL_App *app,
+                              GNUNET_ContinuationCallback disconnect_cb,
+                              void *disconnect_cls)
 {
-  GNUNET_CLIENT_MANAGER_disconnect (app->client, GNUNET_NO, NULL, NULL);
+  if (NULL == app) return;
+
+  app->disconnect_cb = disconnect_cb;
+  app->disconnect_cls = disconnect_cls;
+
+  if (NULL != app->mq)
+  {
+    struct GNUNET_MQ_Envelope *env = GNUNET_MQ_get_last_envelope (app->mq);
+    if (NULL != env)
+    {
+      GNUNET_MQ_notify_sent (env, (GNUNET_SCHEDULER_TaskCallback) app_cleanup, app);
+    }
+    else
+    {
+      app_cleanup (app);
+    }
+  }
+  else
+  {
+    app_cleanup (app);
+  }
 }
 
 
@@ -3054,11 +2814,13 @@ void
 GNUNET_SOCIAL_app_detach (struct GNUNET_SOCIAL_App *app,
                           struct GNUNET_SOCIAL_Place *plc)
 {
-  struct AppDetachRequest dreq;
-  dreq.header.size = htons (sizeof (dreq));
-  dreq.header.type = htons (GNUNET_MESSAGE_TYPE_SOCIAL_APP_DETACH);
-  dreq.place_pub_key = plc->pub_key;
-  GNUNET_CLIENT_MANAGER_transmit_now (plc->client, &dreq.header);
+  struct AppDetachRequest *dreq;
+  struct GNUNET_MQ_Envelope *
+    env = GNUNET_MQ_msg (dreq, GNUNET_MESSAGE_TYPE_SOCIAL_APP_DETACH);
+  dreq->place_pub_key = plc->pub_key;
+  dreq->ego_pub_key = plc->ego_pub_key;
+
+  GNUNET_MQ_send (app->mq, env);
 }