Merge branch 'master' of git+ssh://gnunet.org/gnunet
[oweals/gnunet.git] / src / transport / gnunet-transport.c
index 28c4c84fb638682098e48d74d0130098e9ea3e30..c3c1afc38b7f0630e87c169b1526e17c0a1b5c98 100644 (file)
@@ -1,21 +1,21 @@
 /*
  This file is part of GNUnet.
- (C) 2011 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2011-2014, 2016, 2017 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
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
+ GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
 
  GNUnet is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- General Public License for more details.
Affero General Public License for more details.
 
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING.  If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
  */
 
 /**
  * @brief Tool to help configure, measure and control the transport subsystem.
  * @author Christian Grothoff
  * @author Nathan Evans
- *
- * This utility can be used to test if a transport mechanism for
- * GNUnet is properly configured.
  */
-
 #include "platform.h"
 #include "gnunet_util_lib.h"
 #include "gnunet_resolver_service.h"
 #include "gnunet_protocols.h"
 #include "gnunet_transport_service.h"
-#include "gnunet_nat_lib.h"
+#include "gnunet_transport_core_service.h"
 
 /**
- * How long do we wait for the NAT test to report success?
- * Should match NAT_SERVER_TIMEOUT in 'nat_test.c'.
+ * Timeout for a name resolution
  */
-#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 20)
 #define RESOLUTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
+
+/**
+ * Timeout for an operation
+ */
 #define OP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
 
+
 /**
- * Benchmarking block size in KB
+ * Context to store name resolutions for valiation
  */
-#define BLOCKSIZE 4
+struct ValidationResolutionContext
+{
+  /**
+   * Next in DLL
+   */
+  struct ValidationResolutionContext *next;
+
+  /**
+   * Previous in DLL
+   */
+  struct ValidationResolutionContext *prev;
+
+  /**
+   * Address to resolve
+   */
+  struct GNUNET_HELLO_Address *addrcp;
+
+  /**
+   * Time of last validation
+   */
+  struct GNUNET_TIME_Absolute last_validation;
+
+  /**
+   * Address is valid until
+   */
+  struct GNUNET_TIME_Absolute valid_until;
+
+  /**
+   * Time of next validation
+   */
+  struct GNUNET_TIME_Absolute next_validation;
+
+  /**
+   * Tranport conversion handle
+   */
+  struct GNUNET_TRANSPORT_AddressToStringContext *asc;
+
+  /**
+   * plugin name
+   */
+  char *transport;
+
+  /**
+   * was the entry printed
+   */
+  int printed;
+};
+
+/**
+ * Struct to store information about peers in monitor mode
+ */
+struct MonitoredPeer
+{
+  /**
+   * State of the peer
+   */
+  enum GNUNET_TRANSPORT_PeerState state;
+
+  /**
+   * Timeout
+   */
+  struct GNUNET_TIME_Absolute state_timeout;
+
+  /**
+   * The address to convert
+   */
+  struct GNUNET_HELLO_Address *address;
+};
+
+/**
+ * Context to store name resolutions for valiation
+ */
+struct PeerResolutionContext
+{
+  /**
+   * Next in DLL
+   */
+  struct PeerResolutionContext *next;
+
+  /**
+   * Prev in DLL
+   */
+  struct PeerResolutionContext *prev;
+
+  /**
+   * address to resolve
+   */
+  struct GNUNET_HELLO_Address *addrcp;
+
+  /**
+   * transport conversiion context
+   */
+  struct GNUNET_TRANSPORT_AddressToStringContext *asc;
+
+  /**
+   * peer state
+   */
+  enum GNUNET_TRANSPORT_PeerState state;
+
+  /**
+   * state timeout
+   */
+  struct GNUNET_TIME_Absolute state_timeout;
+
+  /**
+   * transport plugin
+   */
+  char *transport;
+
+  /**
+   * was the entry printed
+   */
+  int printed;
+};
+
 
 /**
- * Which peer should we connect to?
+ * Benchmarking block size in KB
  */
-static char *cpid;
+#define BLOCKSIZE 4
 
 /**
  * Handle to transport service.
  */
-static struct GNUNET_TRANSPORT_Handle *handle;
+static struct GNUNET_TRANSPORT_CoreHandle *handle;
 
 /**
  * Configuration handle
@@ -64,9 +177,9 @@ static struct GNUNET_TRANSPORT_Handle *handle;
 static struct GNUNET_CONFIGURATION_Handle *cfg;
 
 /**
- * Try_connect handle
+ * Blacklisting handle
  */
-struct GNUNET_TRANSPORT_TryConnectHandle * tc_handle;
+struct GNUNET_TRANSPORT_Blacklist *blacklist;
 
 /**
  * Option -s.
@@ -88,21 +201,11 @@ static int benchmark_receive;
  */
 static int iterate_connections;
 
-/**
- * Option -d.
- */
-static int iterate_validation;
-
 /**
  * Option -a.
  */
 static int iterate_all;
 
-/**
- * Option -t.
- */
-static int test_configuration;
-
 /**
  * Option -c.
  */
@@ -114,19 +217,14 @@ static int monitor_connects;
 static int monitor_connections;
 
 /**
- * Option -f.
- */
-static int monitor_validation;
-
-/**
- * Option -C.
+ * Option -P.
  */
-static int try_connect;
+static int monitor_plugins;
 
 /**
  * Option -D.
  */
-static int try_disconnect;
+static int do_disconnect;
 
 /**
  * Option -n.
@@ -159,42 +257,40 @@ static unsigned long long traffic_sent;
 static struct GNUNET_TIME_Absolute start_time;
 
 /**
- * Handle for current transmission request.
+ * Map storing information about monitored peers
  */
-static struct GNUNET_TRANSPORT_TransmitHandle *th;
+static struct GNUNET_CONTAINER_MultiPeerMap *monitored_peers;
 
 /**
- * Map storing information about monitored peers
+ * Map storing information about monitored plugins's sessions.
  */
-static struct GNUNET_CONTAINER_MultiPeerMap *monitored_peers;
+static struct GNUNET_CONTAINER_MultiPeerMap *monitored_plugins;
 
 /**
- *
+ * Handle if we are monitoring peers at the transport level.
  */
 static struct GNUNET_TRANSPORT_PeerMonitoringContext *pic;
 
-static struct GNUNET_TRANSPORT_ValidationMonitoringContext *vic;
-
 /**
- * Identity of the peer we transmit to / connect to.
- * (equivalent to 'cpid' string).
+ * Handle if we are monitoring plugin session activity.
  */
-static struct GNUNET_PeerIdentity pid;
+static struct GNUNET_TRANSPORT_PluginMonitor *pm;
 
 /**
- * Task scheduled for cleanup / termination of the process.
+ * Identity of the peer we transmit to / connect to.
+ * ('-p' command-line option).
  */
-static GNUNET_SCHEDULER_TaskIdentifier end;
+static struct GNUNET_PeerIdentity pid;
 
 /**
  * Task for operation timeout
  */
-static GNUNET_SCHEDULER_TaskIdentifier op_timeout;
+static struct GNUNET_SCHEDULER_Task *op_timeout;
 
 /**
  * Selected level of verbosity.
  */
-static int verbosity;
+static unsigned int verbosity;
 
 /**
  * Resolver process handle.
@@ -207,109 +303,34 @@ struct GNUNET_OS_Process *resolver;
 static unsigned int address_resolutions;
 
 /**
- * Address resolutions pending in progress
+ * DLL: head of validation resolution entries
  */
-static unsigned int address_resolution_in_progress;
+static struct ValidationResolutionContext *vc_head;
 
 /**
- * DLL for NAT Test Contexts: head
+ * DLL: tail of validation resolution entries
  */
-struct TestContext *head;
+static struct ValidationResolutionContext *vc_tail;
 
 /**
- * DLL for NAT Test Contexts: tail
+ * DLL: head of resolution entries
  */
-struct TestContext *tail;
+static struct PeerResolutionContext *rc_head;
 
 /**
- * Context for a plugin test.
+ * DLL: head of resolution entries
  */
-struct TestContext
-{
-  /**
-   * Previous in DLL
-   */
-  struct TestContext *prev;
-
-  /**
-   * Next in DLL
-   */
-  struct TestContext *next;
-
-  /**
-   * Handle to the active NAT test.
-   */
-  struct GNUNET_NAT_Test *tst;
-
-  /**
-   * Task identifier for the timeout.
-   */
-  GNUNET_SCHEDULER_TaskIdentifier tsk;
-
-  /**
-   * Name of plugin under test.
-   */
-  char *name;
-
-  /**
-   * Bound port
-   */
-  unsigned long long bnd_port;
-
-  /**
-   * Advertised ports
-   */
-  unsigned long long adv_port;
-
-};
-
-enum TestResult
-{
-  /* NAT returned success */
-  NAT_TEST_SUCCESS = GNUNET_OK,
-
-  /* NAT returned failure  */
-  NAT_TEST_FAIL = GNUNET_NO,
-
-  /* NAT returned failure while running test */
-  NAT_TEST_INTERNAL_FAIL = GNUNET_SYSERR,
-
-  /* We could not start the test */
-  NAT_TEST_FAILED_TO_START = 2,
-
-  /* We had a timeout while running the test */
-  NAT_TEST_TIMEOUT = 3,
-};
-
-static struct ValidationResolutionContext *vc_head;
-static struct ValidationResolutionContext *vc_tail;
-
-struct ValidationResolutionContext
-{
-  struct ValidationResolutionContext *next;
-  struct ValidationResolutionContext *prev;
-
-  struct GNUNET_PeerIdentity id;
-  struct GNUNET_HELLO_Address *addrcp;
-  struct GNUNET_TIME_Absolute last_validation;
-  struct GNUNET_TIME_Absolute valid_until;
-  struct GNUNET_TIME_Absolute next_validation;
-  enum GNUNET_TRANSPORT_ValidationState state;
-
-  struct GNUNET_TRANSPORT_AddressToStringContext *asc;
-
-  char *transport;
-  int printed;
-};
-
-struct MonitoredPeer
-{
-  enum GNUNET_TRANSPORT_PeerState state;
-  struct GNUNET_TIME_Absolute state_timeout;
-  struct GNUNET_HELLO_Address *address;
-};
+static struct PeerResolutionContext *rc_tail;
 
 
+/**
+ * Function called to release data stored in the #monitored_peers map.
+ *
+ * @param cls unused
+ * @param key the peer identity
+ * @param value a `struct MonitoredPeer` to release
+ * @return #GNUNET_OK (continue to iterate)
+ */
 static int
 destroy_it (void *cls,
             const struct GNUNET_PeerIdentity *key,
@@ -317,8 +338,10 @@ destroy_it (void *cls,
 {
   struct MonitoredPeer *m = value;
 
-  GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multipeermap_remove (monitored_peers,
-                                                                    key, value));
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_CONTAINER_multipeermap_remove (monitored_peers,
+                                                       key,
+                                                       value));
   GNUNET_free_non_null (m->address);
   GNUNET_free (value);
   return GNUNET_OK;
@@ -329,35 +352,30 @@ destroy_it (void *cls,
  * Task run in monitor mode when the user presses CTRL-C to abort.
  * Stops monitoring activity.
  *
- * @param cls the 'struct GNUNET_TRANSPORT_PeerIterateContext *'
- * @param tc scheduler context
+ * @param cls NULL
  */
 static void
-shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+shutdown_task (void *cls)
 {
   struct GNUNET_TIME_Relative duration;
   struct ValidationResolutionContext *cur;
   struct ValidationResolutionContext *next;
-  end = GNUNET_SCHEDULER_NO_TASK;
-  if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
+  struct PeerResolutionContext *rc;
+
+  if (NULL != op_timeout)
   {
     GNUNET_SCHEDULER_cancel (op_timeout);
-    op_timeout = GNUNET_SCHEDULER_NO_TASK;
-  }
-  if (NULL != tc_handle)
-  {
-    GNUNET_TRANSPORT_try_connect_cancel (tc_handle);
-    tc_handle = NULL;
+    op_timeout = NULL;
   }
   if (NULL != pic)
   {
     GNUNET_TRANSPORT_monitor_peers_cancel (pic);
     pic = NULL;
   }
-  if (NULL != vic)
+  if (NULL != pm)
   {
-    GNUNET_TRANSPORT_monitor_validation_entries_cancel (vic);
-    vic = NULL;
+    GNUNET_TRANSPORT_monitor_plugins_cancel (pm);
+    pm = NULL;
   }
 
   next = vc_head;
@@ -366,77 +384,89 @@ shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
     next = cur->next;
 
     GNUNET_TRANSPORT_address_to_string_cancel (cur->asc);
-    GNUNET_CONTAINER_DLL_remove (vc_head, vc_tail, cur);
+    GNUNET_CONTAINER_DLL_remove (vc_head,
+                                vc_tail,
+                                cur);
     GNUNET_free (cur->transport);
     GNUNET_HELLO_address_free (cur->addrcp);
     GNUNET_free (cur);
   }
-
-  if (NULL != th)
+  while (NULL != (rc = rc_head))
   {
-    GNUNET_TRANSPORT_notify_transmit_ready_cancel (th);
-    th = NULL;
+    GNUNET_CONTAINER_DLL_remove (rc_head,
+                                rc_tail,
+                                rc);
+    GNUNET_TRANSPORT_address_to_string_cancel (rc->asc);
+    GNUNET_free (rc->transport);
+    GNUNET_free (rc->addrcp);
+    GNUNET_free (rc);
   }
   if (NULL != handle)
   {
-    GNUNET_TRANSPORT_disconnect (handle);
+    GNUNET_TRANSPORT_core_disconnect (handle);
     handle = NULL;
   }
   if (benchmark_send)
   {
     duration = GNUNET_TIME_absolute_get_duration (start_time);
-    FPRINTF (stdout, _("Transmitted %llu bytes/s (%llu bytes in %s)\n"),
-        1000LL * 1000LL * traffic_sent / (1 + duration.rel_value_us),
-        traffic_sent,
-        GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
+    FPRINTF (stdout,
+             _("Transmitted %llu bytes/s (%llu bytes in %s)\n"),
+             1000LL * 1000LL * traffic_sent / (1 + duration.rel_value_us),
+             traffic_sent,
+             GNUNET_STRINGS_relative_time_to_string (duration,
+                                                    GNUNET_YES));
   }
   if (benchmark_receive)
   {
     duration = GNUNET_TIME_absolute_get_duration (start_time);
-    FPRINTF (stdout, _("Received %llu bytes/s (%llu bytes in %s)\n"),
-        1000LL * 1000LL * traffic_received / (1 + duration.rel_value_us),
-        traffic_received,
-        GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
+    FPRINTF (stdout,
+             _("Received %llu bytes/s (%llu bytes in %s)\n"),
+             1000LL * 1000LL * traffic_received / (1 + duration.rel_value_us),
+             traffic_received,
+             GNUNET_STRINGS_relative_time_to_string (duration,
+                                                    GNUNET_YES));
   }
 
   if (NULL != monitored_peers)
   {
-    GNUNET_CONTAINER_multipeermap_iterate (monitored_peers, &destroy_it, NULL);
+    GNUNET_CONTAINER_multipeermap_iterate (monitored_peers,
+                                          &destroy_it,
+                                          NULL);
     GNUNET_CONTAINER_multipeermap_destroy (monitored_peers);
     monitored_peers = NULL;
   }
+  if (NULL != monitored_plugins)
+  {
+    GNUNET_break (0 ==
+                  GNUNET_CONTAINER_multipeermap_size (monitored_plugins));
+    GNUNET_CONTAINER_multipeermap_destroy (monitored_plugins);
+    monitored_plugins = NULL;
+  }
+  if (NULL != blacklist)
+  {
+    GNUNET_TRANSPORT_blacklist_cancel (blacklist);
+    blacklist = NULL;
+    ret = 0;
+  }
 }
 
-static struct PeerResolutionContext *rc_head;
-static struct PeerResolutionContext *rc_tail;
-
-struct PeerResolutionContext
-{
-  struct PeerResolutionContext *next;
-  struct PeerResolutionContext *prev;
-  struct GNUNET_PeerIdentity id;
-  struct GNUNET_HELLO_Address *addrcp;
-  struct GNUNET_TRANSPORT_AddressToStringContext *asc;
-  enum GNUNET_TRANSPORT_PeerState state;
-  struct GNUNET_TIME_Absolute state_timeout;
-  char *transport;
-  int printed;
-};
-
-
 
+/**
+ * We are done, shut down.
+ */
 static void
-operation_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+operation_timeout (void *cls)
 {
   struct PeerResolutionContext *cur;
   struct PeerResolutionContext *next;
-  op_timeout = GNUNET_SCHEDULER_NO_TASK;
-  if ((try_connect) || (benchmark_send) || (benchmark_receive))
+
+  op_timeout = NULL;
+  if ((benchmark_send) || (benchmark_receive))
   {
-    FPRINTF (stdout, _("Failed to connect to `%s'\n"), GNUNET_i2s_full (&pid));
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
+    FPRINTF (stdout,
+             _("Failed to connect to `%s'\n"),
+             GNUNET_i2s_full (&pid));
+    GNUNET_SCHEDULER_shutdown ();
     ret = 1;
     return;
   }
@@ -446,417 +476,58 @@ operation_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
     while (NULL != (cur = next))
     {
       next = cur->next;
-      FPRINTF (stdout, _("Failed to resolve address for peer `%s'\n"),
-          GNUNET_i2s (&cur->addrcp->peer));
+      FPRINTF (stdout,
+               _("Failed to resolve address for peer `%s'\n"),
+               GNUNET_i2s (&cur->addrcp->peer));
 
-      GNUNET_CONTAINER_DLL_remove(rc_head, rc_tail, cur);
+      GNUNET_CONTAINER_DLL_remove(rc_head,
+                                 rc_tail,
+                                 cur);
       GNUNET_TRANSPORT_address_to_string_cancel (cur->asc);
-      GNUNET_free(cur->transport);
-      GNUNET_free(cur->addrcp);
-      GNUNET_free(cur);
+      GNUNET_free (cur->transport);
+      GNUNET_free (cur->addrcp);
+      GNUNET_free (cur);
 
     }
-    FPRINTF (stdout, "%s", _("Failed to list connections, timeout occured\n") );
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    ret = 1;
-    return;
-  }
-
-}
-
-static void
-run_nat_test ();
-
-/**
- * Display the result of the test.
- *
- * @param tc test context
- * @param result #GNUNET_YES on success
- */
-static void
-display_test_result (struct TestContext *tc, enum TestResult result)
-{
-  switch (result) {
-    case NAT_TEST_FAIL:
-      FPRINTF (stderr, _("Configuration for plugin `%s' did not work!\n"),
-          tc->name);
-      break;
-    case NAT_TEST_SUCCESS:
-      FPRINTF (stderr, _("Configuration for plugin `%s' did work!\n"),
-          tc->name);
-      break;
-    case NAT_TEST_INTERNAL_FAIL:
-      FPRINTF (stderr, _("Internal NAT error while running test for plugin `%s'\n"),
-          tc->name);
-      break;
-    case NAT_TEST_FAILED_TO_START:
-      FPRINTF (stderr, _("Failed to start NAT test for plugin `%s'\n"),
-          tc->name);
-      break;
-    case NAT_TEST_TIMEOUT:
-      FPRINTF (stderr, _("Timeout while waiting for result of NAT test for plugin `%s'\n"),
-          tc->name);
-      break;
-    default:
-      break;
-  }
-
-  if (GNUNET_YES != result)
-  {
-    FPRINTF (stderr, "Configuration for plugin `%s' did not work!\n", tc->name);
-  }
-  else
-  {
-    FPRINTF (stderr, "Configuration for plugin `%s' is working!\n", tc->name);
-  }
-  if (GNUNET_SCHEDULER_NO_TASK != tc->tsk)
-  {
-    GNUNET_SCHEDULER_cancel (tc->tsk);
-    tc->tsk = GNUNET_SCHEDULER_NO_TASK;
-  }
-  if (NULL != tc->tst)
-  {
-    GNUNET_NAT_test_stop (tc->tst);
-    tc->tst = NULL;
-  }
-
-  GNUNET_CONTAINER_DLL_remove (head, tail, tc);
-  GNUNET_free (tc->name);
-  GNUNET_free (tc);
-
-  if ((NULL == head) && (NULL != resolver))
-  {
-    GNUNET_break(0 == GNUNET_OS_process_kill (resolver, GNUNET_TERM_SIG));
-    GNUNET_OS_process_destroy (resolver);
-    resolver = NULL;
-  }
-  if (NULL != head)
-    run_nat_test ();
-}
-
-/**
- * Function called by NAT on success.
- * Clean up and update GUI (with success).
- *
- * @param cls test context
- * @param success currently always #GNUNET_OK
- * @param emsg error message, NULL on success
- */
-static void
-result_callback (void *cls, int success, const char *emsg)
-{
-  struct TestContext *tc = cls;
-  display_test_result (tc, success);
-}
-
-/**
- * Function called if NAT failed to confirm success.
- * Clean up and update GUI (with failure).
- *
- * @param cls test context
- * @param tc scheduler callback
- */
-static void
-fail_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
-  struct TestContext *tstc = cls;
-
-  tstc->tsk = GNUNET_SCHEDULER_NO_TASK;
-  display_test_result (tstc, NAT_TEST_TIMEOUT);
-}
-
-
-static void
-resolve_validation_address (const struct GNUNET_PeerIdentity *id,
-                            const struct GNUNET_HELLO_Address *address,
-                            int numeric,
-                            struct GNUNET_TIME_Absolute last_validation,
-                            struct GNUNET_TIME_Absolute valid_until,
-                            struct GNUNET_TIME_Absolute next_validation,
-                            enum GNUNET_TRANSPORT_ValidationState state);
-
-
-static void
-process_validation_string (void *cls, const char *address)
-{
-  struct ValidationResolutionContext *vc = cls;
-  char *s_valid;
-  char *s_last;
-  char *s_next;
-
-  if (address != NULL )
-  {
-    if (GNUNET_TIME_UNIT_ZERO_ABS.abs_value_us == vc->valid_until.abs_value_us)
-      s_valid = GNUNET_strdup("never");
-    else
-      s_valid = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string (vc->valid_until));
-
-    if (GNUNET_TIME_UNIT_ZERO_ABS.abs_value_us == vc->last_validation.abs_value_us)
-      s_last = GNUNET_strdup("never");
-    else
-      s_last = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string (vc->last_validation));
-
-    if (GNUNET_TIME_UNIT_ZERO_ABS.abs_value_us == vc->next_validation.abs_value_us)
-      s_next = GNUNET_strdup("never");
-    else
-      s_next = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string (vc->next_validation));
-
     FPRINTF (stdout,
-        _("Peer `%s' %s %s\n\t%s%s\n\t%s%s\n\t%s%s\n"),
-        GNUNET_i2s (&vc->id), address,
-        (monitor_validation) ? GNUNET_TRANSPORT_vs2s (vc->state) : "",
-        "Valid until    : ", s_valid,
-        "Last validation: ",s_last,
-        "Next validation: ", s_next);
-    GNUNET_free (s_valid);
-    GNUNET_free (s_last);
-    GNUNET_free (s_next);
-    vc->printed = GNUNET_YES;
-  }
-  else
-  {
-    /* done */
-    GNUNET_assert(address_resolutions > 0);
-    address_resolutions--;
-    if (GNUNET_NO == vc->printed)
-    {
-      if (numeric == GNUNET_NO)
-      {
-        /* Failed to resolve address, try numeric lookup */
-        resolve_validation_address (&vc->id, vc->addrcp, GNUNET_NO,
-           vc->last_validation, vc->valid_until, vc->next_validation,
-           vc->state);
-      }
-      else
-      {
-        FPRINTF (stdout, _("Peer `%s' %s `%s' \n"),
-            GNUNET_i2s (&vc->id), "<unable to resolve address>",
-            GNUNET_TRANSPORT_vs2s (vc->state));
-      }
-    }
-    GNUNET_free (vc->transport);
-    GNUNET_free (vc->addrcp);
-    GNUNET_CONTAINER_DLL_remove(vc_head, vc_tail, vc);
-    GNUNET_free(vc);
-    if ((0 == address_resolutions) && (iterate_validation))
-    {
-      if (GNUNET_SCHEDULER_NO_TASK != end)
-      {
-        GNUNET_SCHEDULER_cancel (end);
-        end = GNUNET_SCHEDULER_NO_TASK;
-      }
-      if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
-      {
-        GNUNET_SCHEDULER_cancel (op_timeout);
-        op_timeout = GNUNET_SCHEDULER_NO_TASK;
-      }
-      ret = 0;
-      end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    }
-  }
-}
-
-
-
-static void
-resolve_validation_address (const struct GNUNET_PeerIdentity *id,
-    const struct GNUNET_HELLO_Address *address, int numeric,
-    struct GNUNET_TIME_Absolute last_validation,
-    struct GNUNET_TIME_Absolute valid_until,
-    struct GNUNET_TIME_Absolute next_validation,
-    enum GNUNET_TRANSPORT_ValidationState state)
-{
-  struct ValidationResolutionContext *vc;
-
-  vc = GNUNET_new (struct ValidationResolutionContext);
-  GNUNET_assert(NULL != vc);
-  GNUNET_CONTAINER_DLL_insert(vc_head, vc_tail, vc);
-  address_resolutions++;
-
-  vc->id = (*id);
-  vc->transport = GNUNET_strdup(address->transport_name);
-  vc->addrcp = GNUNET_HELLO_address_copy (address);
-  vc->printed = GNUNET_NO;
-  vc->state = state;
-  vc->last_validation = last_validation;
-  vc->valid_until = valid_until;
-  vc->next_validation = next_validation;
-
-  /* Resolve address to string */
-  vc->asc = GNUNET_TRANSPORT_address_to_string (cfg, address, numeric,
-      RESOLUTION_TIMEOUT, &process_validation_string, vc);
-}
-
-
-static void
-process_validation_cb (void *cls,
-                       const struct GNUNET_PeerIdentity *peer,
-                       const struct GNUNET_HELLO_Address *address,
-                       struct GNUNET_TIME_Absolute last_validation,
-                       struct GNUNET_TIME_Absolute valid_until,
-                       struct GNUNET_TIME_Absolute next_validation,
-                       enum GNUNET_TRANSPORT_ValidationState state)
-{
-  if ((NULL == peer) && (NULL == address))
-  {
-    if (monitor_validation)
-    {
-      FPRINTF (stdout,
-               "%s",
-               _("Monitor disconnected from transport service. Reconnecting.\n"));
-      return;
-    }
-
-    /* done */
-    vic = NULL;
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    return;
-  }
-  if ((NULL == peer) || (NULL == address))
-  {
-    /* invalid response */
-    vic = NULL;
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    return;
-  }
-  resolve_validation_address (peer, address,
-     numeric, last_validation,
-     valid_until, next_validation, state);
-}
-
-
-static void
-run_nat_test ()
-{
-  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-      "Running test for plugin `%s' using bind port %u and advertised port %u \n",
-      head->name, (uint16_t) head->bnd_port, (uint16_t) head->adv_port);
-
-  head->tst = GNUNET_NAT_test_start (cfg,
-      (0 == strcasecmp (head->name, "udp")) ? GNUNET_NO : GNUNET_YES,
-      (uint16_t) head->bnd_port,
-      (uint16_t) head->adv_port,
-      &result_callback, head);
-  if (NULL == head->tst)
-  {
-    display_test_result (head, NAT_TEST_FAILED_TO_START);
+             "%s",
+             _("Failed to list connections, timeout occurred\n"));
+    GNUNET_SCHEDULER_shutdown ();
+    ret = 1;
     return;
   }
-  head->tsk = GNUNET_SCHEDULER_add_delayed (TIMEOUT, &fail_timeout, head);
 }
 
 
-/**
- * Test our plugin's configuration (NAT traversal, etc.).
- *
- * @param cfg configuration to test
- */
-static void
-do_test_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg)
-{
-  char *plugins;
-  char *tok;
-  unsigned long long bnd_port;
-  unsigned long long adv_port;
-  struct TestContext *tc;
-  char *binary;
-
-  if (GNUNET_OK
-      != GNUNET_CONFIGURATION_get_value_string (cfg, "transport", "plugins",
-          &plugins))
-  {
-    FPRINTF (stderr, "%s", _
-    ("No transport plugins configured, peer will never communicate\n") );
-    ret = 4;
-    return;
-  }
-
-  for (tok = strtok (plugins, " "); tok != NULL ; tok = strtok (NULL, " "))
-  {
-    char section[12 + strlen (tok)];
-    GNUNET_snprintf (section, sizeof(section), "transport-%s", tok);
-    if (GNUNET_OK
-        != GNUNET_CONFIGURATION_get_value_number (cfg, section, "PORT",
-            &bnd_port))
-    {
-      FPRINTF (stderr,
-          _("No port configured for plugin `%s', cannot test it\n"), tok);
-      continue;
-    }
-    if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg, section,
-            "ADVERTISED_PORT", &adv_port))
-      adv_port = bnd_port;
-
-    tc = GNUNET_new (struct TestContext);
-    tc->name = GNUNET_strdup (tok);
-    tc->adv_port = adv_port;
-    tc->bnd_port = bnd_port;
-    GNUNET_CONTAINER_DLL_insert_tail (head, tail, tc);
-  }
-  GNUNET_free(plugins);
-
-  if ((NULL != head) && (NULL == resolver))
-  {
-    binary = GNUNET_OS_get_libexec_binary_path ("gnunet-service-resolver");
-    resolver = GNUNET_OS_start_process (GNUNET_YES,
-                                        GNUNET_OS_INHERIT_STD_OUT_AND_ERR,
-                                        NULL, NULL, NULL,
-                                        binary,
-                                        "gnunet-service-resolver", NULL );
-    if (NULL == resolver)
-    {
-      FPRINTF (stderr, _("Failed to start resolver!\n"));
-      return;
-    }
-
-    GNUNET_free(binary);
-    GNUNET_RESOLVER_connect (cfg);
-    run_nat_test ();
-  }
-}
-
 /**
  * Function called to notify a client about the socket
- * begin ready to queue more data.  @a buf will be
- * NULL and @a size zero if the socket was closed for
- * writing in the meantime.
+ * begin ready to queue more data.  Sends another message.
  *
- * @param cls closure
- * @param size number of bytes available in @a buf
- * @param buf where the callee should write the message
- * @return number of bytes written to @a buf
+ * @param cls closure with the message queue
  */
-static size_t
-transmit_data (void *cls, size_t size, void *buf)
+static void
+do_send (void *cls)
 {
-  struct GNUNET_MessageHeader *m = buf;
-
-  if ((NULL == buf) || (0 == size))
-  {
-    th = NULL;
-    return 0;
-  }
-
-  GNUNET_assert(size >= sizeof(struct GNUNET_MessageHeader));
-  GNUNET_assert(size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
-  m->size = ntohs (size);
-  m->type = ntohs (GNUNET_MESSAGE_TYPE_DUMMY);
-  memset (&m[1], 52, size - sizeof(struct GNUNET_MessageHeader));
-  traffic_sent += size;
-  th = GNUNET_TRANSPORT_notify_transmit_ready (handle, &pid,
-                                               BLOCKSIZE * 1024,
-                                               GNUNET_TIME_UNIT_FOREVER_REL,
-                                               &transmit_data, NULL );
+  struct GNUNET_MQ_Handle *mq = cls;
+  struct GNUNET_MessageHeader *m;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg_extra (m,
+                            BLOCKSIZE * 1024,
+                             GNUNET_MESSAGE_TYPE_DUMMY);
+  memset (&m[1],
+         52,
+         BLOCKSIZE * 1024 - sizeof(struct GNUNET_MessageHeader));
+  traffic_sent += BLOCKSIZE * 1024;
+  GNUNET_MQ_notify_sent (env,
+                        &do_send,
+                        mq);
   if (verbosity > 0)
-    FPRINTF (stdout, _("Transmitting %u bytes to %s\n"), (unsigned int) size,
-        GNUNET_i2s (&pid));
-  return size;
+    FPRINTF (stdout,
+            _("Transmitting %u bytes\n"),
+            (unsigned int) BLOCKSIZE * 1024);
+  GNUNET_MQ_send (mq,
+                 env);
 }
 
 
@@ -864,120 +535,90 @@ transmit_data (void *cls, size_t size, void *buf)
  * Function called to notify transport users that another
  * peer connected to us.
  *
- * @param cls closure
- * @param peer the peer that connected
- */
-static void
-notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
-{
-  if (0 != memcmp (&pid, peer, sizeof(struct GNUNET_PeerIdentity)))
-    return;
-  ret = 0;
-  if (try_connect)
-  {
-    /* all done, terminate instantly */
-    FPRINTF (stdout, _("Successfully connected to `%s'\n"),
-        GNUNET_i2s_full (peer));
-    ret = 0;
-
-    if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
-    {
-      GNUNET_SCHEDULER_cancel (op_timeout);
-      op_timeout = GNUNET_SCHEDULER_NO_TASK;
-    }
-
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    return;
-  }
-  if (benchmark_send)
-  {
-    if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
-    {
-      GNUNET_SCHEDULER_cancel (op_timeout);
-      op_timeout = GNUNET_SCHEDULER_NO_TASK;
-    }
-    if (verbosity > 0)
-      FPRINTF (stdout,
-          _("Successfully connected to `%s', starting to send benchmark data in %u Kb blocks\n"),
-          GNUNET_i2s (&pid), BLOCKSIZE);
-    start_time = GNUNET_TIME_absolute_get ();
-    if (NULL == th)
-      th = GNUNET_TRANSPORT_notify_transmit_ready (handle, peer,
-                                                   BLOCKSIZE * 1024,
-                                                   GNUNET_TIME_UNIT_FOREVER_REL,
-                                                   &transmit_data,
-                                                   NULL);
-    else
-      GNUNET_break(0);
-    return;
+ * @param cls closure
+ * @param peer the peer that connected
+ * @param mq message queue for sending to @a peer
+ */
+static void *
+notify_connect (void *cls,
+                const struct GNUNET_PeerIdentity *peer,
+               struct GNUNET_MQ_Handle *mq)
+{
+  if (0 != memcmp (&pid,
+                  peer,
+                  sizeof(struct GNUNET_PeerIdentity)))
+    return NULL;
+  ret = 0;
+  if (! benchmark_send)
+    return NULL;
+  if (NULL != op_timeout)
+  {
+    GNUNET_SCHEDULER_cancel (op_timeout);
+    op_timeout = NULL;
   }
+  if (verbosity > 0)
+    FPRINTF (stdout,
+            _("Successfully connected to `%s', starting to send benchmark data in %u Kb blocks\n"),
+            GNUNET_i2s (peer),
+            BLOCKSIZE);
+  start_time = GNUNET_TIME_absolute_get ();
+  do_send (mq);
+  return mq;
 }
 
+
 /**
  * Function called to notify transport users that another
  * peer disconnected from us.
  *
  * @param cls closure
  * @param peer the peer that disconnected
+ * @param internal_cls what we returned from #notify_connect()
  */
 static void
-notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+notify_disconnect (void *cls,
+                   const struct GNUNET_PeerIdentity *peer,
+                  void *internal_cls)
 {
-  if (0 != memcmp (&pid, peer, sizeof(struct GNUNET_PeerIdentity)))
-    return;
-
-  if (try_disconnect)
-  {
-    /* all done, terminate instantly */
-    FPRINTF (stdout, _("Successfully disconnected from `%s'\n"),
-        GNUNET_i2s_full (peer));
-    ret = 0;
-
-    if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
-    {
-      GNUNET_SCHEDULER_cancel (op_timeout);
-      op_timeout = GNUNET_SCHEDULER_NO_TASK;
-    }
-
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    return;
-  }
-
-  if (NULL != th)
-  {
-    GNUNET_TRANSPORT_notify_transmit_ready_cancel (th);
-    th = NULL;
-  }
-  if (benchmark_send)
-  {
-    FPRINTF (stdout, _("Disconnected from peer `%s' while benchmarking\n"),
-        GNUNET_i2s (&pid));
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
+  if (0 != memcmp (&pid,
+                  peer,
+                  sizeof(struct GNUNET_PeerIdentity)))
     return;
-  }
+  if (NULL == internal_cls)
+    return; /* not about target peer */
+  if (! benchmark_send)
+    return; /* not transmitting */
+  FPRINTF (stdout,
+          _("Disconnected from peer `%s' while benchmarking\n"),
+          GNUNET_i2s (&pid));
 }
 
+
 /**
  * Function called to notify transport users that another
  * peer connected to us.
  *
  * @param cls closure
  * @param peer the peer that connected
+ * @param mq for sending messages to @a peer
+ * @return NULL
  */
-static void
-monitor_notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
+static void *
+monitor_notify_connect (void *cls,
+                        const struct GNUNET_PeerIdentity *peer,
+                       struct GNUNET_MQ_Handle *mq)
 {
-  monitor_connect_counter++;
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
   const char *now_str = GNUNET_STRINGS_absolute_time_to_string (now);
 
-  FPRINTF (stdout, _("%24s: %-17s %4s   (%u connections in total)\n"), now_str,
-      _("Connected to"), GNUNET_i2s (peer), monitor_connect_counter);
+  monitor_connect_counter++;
+  FPRINTF (stdout,
+           _("%24s: %-17s %4s   (%u connections in total)\n"),
+           now_str,
+           _("Connected to"),
+           GNUNET_i2s (peer),
+           monitor_connect_counter);
+  return NULL;
 }
 
 
@@ -987,9 +628,12 @@ monitor_notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
  *
  * @param cls closure
  * @param peer the peer that disconnected
+ * @param internal_cls what we returned from #monitor_notify_connect()
  */
 static void
-monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+monitor_notify_disconnect (void *cls,
+                           const struct GNUNET_PeerIdentity *peer,
+                          void *internal_cls)
 {
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
   const char *now_str = GNUNET_STRINGS_absolute_time_to_string (now);
@@ -997,8 +641,12 @@ monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
   GNUNET_assert(monitor_connect_counter > 0);
   monitor_connect_counter--;
 
-  FPRINTF (stdout, _("%24s: %-17s %4s   (%u connections in total)\n"), now_str,
-      _("Disconnected from"), GNUNET_i2s (peer), monitor_connect_counter);
+  FPRINTF (stdout,
+           _("%24s: %-17s %4s   (%u connections in total)\n"),
+           now_str,
+           _("Disconnected from"),
+           GNUNET_i2s (peer),
+           monitor_connect_counter);
 }
 
 
@@ -1006,33 +654,50 @@ monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
  * Function called by the transport for each received message.
  *
  * @param cls closure
- * @param peer (claimed) identity of the other peer
  * @param message the message
+ * @return #GNUNET_OK
  */
-static void
-notify_receive (void *cls,
-                const struct GNUNET_PeerIdentity *peer,
-                const struct GNUNET_MessageHeader *message)
+static int
+check_dummy (void *cls,
+            const struct GNUNET_MessageHeader *message)
 {
-  if (benchmark_receive)
-  {
-    if (GNUNET_MESSAGE_TYPE_DUMMY != ntohs (message->type))
-      return;
-    if (verbosity > 0)
-      FPRINTF (stdout, _("Received %u bytes from %s\n"),
-          (unsigned int) ntohs (message->size), GNUNET_i2s (peer));
+  return GNUNET_OK; /* all messages are fine */
+}
+
 
-    if (traffic_received == 0)
-      start_time = GNUNET_TIME_absolute_get ();
-    traffic_received += ntohs (message->size);
+/**
+ * Function called by the transport for each received message.
+ *
+ * @param cls closure
+ * @param message the message
+ */
+static void
+handle_dummy (void *cls,
+             const struct GNUNET_MessageHeader *message)
+{
+  if (! benchmark_receive)
     return;
-  }
+  if (verbosity > 0)
+    FPRINTF (stdout,
+            _("Received %u bytes\n"),
+            (unsigned int) ntohs (message->size));
+  if (0 == traffic_received)
+    start_time = GNUNET_TIME_absolute_get ();
+  traffic_received += ntohs (message->size);
 }
 
 
+/**
+ * Convert address to a printable format.
+ *
+ * @param address the address
+ * @param numeric #GNUNET_YES to convert to numeric format, #GNUNET_NO
+ *                to try to use reverse DNS
+ * @param state state the peer is in
+ * @param state_timeout when will the peer's state expire
+ */
 static void
-resolve_peer_address (const struct GNUNET_PeerIdentity *id,
-                      const struct GNUNET_HELLO_Address *address,
+resolve_peer_address (const struct GNUNET_HELLO_Address *address,
                       int numeric,
                       enum GNUNET_TRANSPORT_PeerState state,
                       struct GNUNET_TIME_Absolute state_timeout);
@@ -1046,80 +711,142 @@ print_info (const struct GNUNET_PeerIdentity *id,
             struct GNUNET_TIME_Absolute state_timeout)
 {
 
-  if ( ((GNUNET_YES == iterate_connections) && (GNUNET_YES == iterate_all)) ||
-       (GNUNET_YES == monitor_connections) )
+  if ( ((GNUNET_YES == iterate_connections) &&
+       (GNUNET_YES == iterate_all)) ||
+       (GNUNET_YES == monitor_connections))
   {
-    FPRINTF (stdout, _("Peer `%s': %s %s in state `%s' until %s\n"),
-        GNUNET_i2s (id),
-        (NULL == transport) ? "<none>" : transport,
-        (NULL == transport) ? "<none>" : addr,
-        GNUNET_TRANSPORT_ps2s (state),
-        GNUNET_STRINGS_absolute_time_to_string (state_timeout));
+    FPRINTF (stdout,
+             _("Peer `%s': %s %s in state `%s' until %s\n"),
+             GNUNET_i2s (id),
+             (NULL == transport) ? "<none>" : transport,
+             (NULL == transport) ? "<none>" : addr,
+             GNUNET_TRANSPORT_ps2s (state),
+             GNUNET_STRINGS_absolute_time_to_string (state_timeout));
   }
   else if ( (GNUNET_YES == iterate_connections) &&
-             (GNUNET_TRANSPORT_is_connected(state)) )
+           (GNUNET_TRANSPORT_is_connected(state)) )
   {
     /* Only connected peers, skip state */
-    FPRINTF (stdout, _("Peer `%s': %s %s\n"), GNUNET_i2s (id), transport, addr);
+    FPRINTF (stdout,
+             _("Peer `%s': %s %s\n"),
+             GNUNET_i2s (id),
+             transport,
+             addr);
   }
 }
 
 
+/**
+ * Function called with a textual representation of an address.  This
+ * function will be called several times with different possible
+ * textual representations, and a last time with @a address being NULL
+ * to signal the end of the iteration.  Note that @a address NULL
+ * always is the last call, regardless of the value in @a res.
+ *
+ * @param cls closure
+ * @param address NULL on end of iteration,
+ *        otherwise 0-terminated printable UTF-8 string,
+ *        in particular an empty string if @a res is #GNUNET_NO
+ * @param res result of the address to string conversion:
+ *        if #GNUNET_OK: conversion successful
+ *        if #GNUNET_NO: address was invalid (or not supported)
+ *        if #GNUNET_SYSERR: communication error (IPC error)
+ */
 static void
-process_peer_string (void *cls, const char *address)
+process_peer_string (void *cls,
+                     const char *address,
+                     int res)
 {
   struct PeerResolutionContext *rc = cls;
 
-  if (address != NULL )
+  if (NULL != address)
   {
-    print_info (&rc->id, rc->transport, address, rc->state, rc->state_timeout);
-    rc->printed = GNUNET_YES;
+    if (GNUNET_SYSERR == res)
+    {
+      FPRINTF (stderr,
+               "Failed to convert address for peer `%s' plugin `%s' length %u to string \n",
+               GNUNET_i2s (&rc->addrcp->peer),
+               rc->addrcp->transport_name,
+               (unsigned int) rc->addrcp->address_length);
+      print_info (&rc->addrcp->peer,
+                  rc->transport,
+                  NULL,
+                  rc->state,
+                  rc->state_timeout);
+      rc->printed = GNUNET_YES;
+      return;
+    }
+    if (GNUNET_OK == res)
+    {
+      print_info (&rc->addrcp->peer,
+                  rc->transport,
+                  address,
+                  rc->state,
+                  rc->state_timeout);
+      rc->printed = GNUNET_YES;
+      return; /* Wait for done call */
+    }
+    /* GNUNET_NO == res: ignore, was simply not supported */
+    return;
   }
-  else
+  /* NULL == address, last call, we are done */
+
+  rc->asc = NULL;
+  GNUNET_assert (address_resolutions > 0);
+  address_resolutions--;
+  if (GNUNET_NO == rc->printed)
   {
-    /* done */
-    GNUNET_assert(address_resolutions > 0);
-    address_resolutions--;
-    if (GNUNET_NO == rc->printed)
+    if (numeric == GNUNET_NO)
     {
-      if (numeric == GNUNET_NO)
-      {
-        /* Failed to resolve address, try numeric lookup */
-        resolve_peer_address (&rc->id, rc->addrcp, GNUNET_YES,
-            rc->state, rc->state_timeout);
-      }
-      else
-      {
-        print_info (&rc->id, rc->transport, "<unable to resolve address>",
-            rc->state, rc->state_timeout);
-      }
+      /* Failed to resolve address, try numeric lookup
+         (note: this should not be needed, as transport
+         should fallback to numeric conversion if DNS takes
+         too long) */
+      resolve_peer_address (rc->addrcp,
+                            GNUNET_YES,
+                            rc->state,
+                            rc->state_timeout);
     }
-    GNUNET_free (rc->transport);
-    GNUNET_free (rc->addrcp);
-    GNUNET_CONTAINER_DLL_remove(rc_head, rc_tail, rc);
-    GNUNET_free(rc);
-    if ((0 == address_resolutions) && (iterate_connections))
+    else
     {
-      if (GNUNET_SCHEDULER_NO_TASK != end)
-      {
-        GNUNET_SCHEDULER_cancel (end);
-        end = GNUNET_SCHEDULER_NO_TASK;
-      }
-      if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
-      {
-        GNUNET_SCHEDULER_cancel (op_timeout);
-        op_timeout = GNUNET_SCHEDULER_NO_TASK;
-      }
-      ret = 0;
-      end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
+      print_info (&rc->addrcp->peer,
+                  rc->transport,
+                  NULL,
+                  rc->state,
+                  rc->state_timeout);
+    }
+  }
+  GNUNET_free (rc->transport);
+  GNUNET_free (rc->addrcp);
+  GNUNET_CONTAINER_DLL_remove (rc_head,
+                              rc_tail,
+                              rc);
+  GNUNET_free (rc);
+  if ((0 == address_resolutions) && (iterate_connections))
+  {
+    if (NULL != op_timeout)
+    {
+      GNUNET_SCHEDULER_cancel (op_timeout);
+      op_timeout = NULL;
     }
+    ret = 0;
+    GNUNET_SCHEDULER_shutdown ();
   }
 }
 
 
+/**
+ * Convert address to a printable format and print it
+ * together with the given state data.
+ *
+ * @param address the address
+ * @param numeric #GNUNET_YES to convert to numeric format, #GNUNET_NO
+ *                to try to use reverse DNS
+ * @param state state the peer is in
+ * @param state_timeout when will the peer's state expire
+ */
 static void
-resolve_peer_address (const struct GNUNET_PeerIdentity *id,
-                      const struct GNUNET_HELLO_Address *address,
+resolve_peer_address (const struct GNUNET_HELLO_Address *address,
                       int numeric,
                       enum GNUNET_TRANSPORT_PeerState state,
                       struct GNUNET_TIME_Absolute state_timeout)
@@ -1127,19 +854,22 @@ resolve_peer_address (const struct GNUNET_PeerIdentity *id,
   struct PeerResolutionContext *rc;
 
   rc = GNUNET_new (struct PeerResolutionContext);
-  GNUNET_assert(NULL != rc);
-  GNUNET_CONTAINER_DLL_insert(rc_head, rc_tail, rc);
+  GNUNET_CONTAINER_DLL_insert (rc_head,
+                              rc_tail,
+                              rc);
   address_resolutions++;
-
-  rc->id = (*id);
-  rc->transport = GNUNET_strdup(address->transport_name);
+  rc->transport = GNUNET_strdup (address->transport_name);
   rc->addrcp = GNUNET_HELLO_address_copy (address);
   rc->printed = GNUNET_NO;
   rc->state = state;
   rc->state_timeout = state_timeout;
   /* Resolve address to string */
-  rc->asc = GNUNET_TRANSPORT_address_to_string (cfg, address, numeric,
-      RESOLUTION_TIMEOUT, &process_peer_string, rc);
+  rc->asc = GNUNET_TRANSPORT_address_to_string (cfg,
+                                                address,
+                                                numeric,
+                                                RESOLUTION_TIMEOUT,
+                                                &process_peer_string,
+                                               rc);
 }
 
 
@@ -1163,44 +893,240 @@ process_peer_iteration_cb (void *cls,
   if (NULL == peer)
   {
     /* done */
-    address_resolution_in_progress = GNUNET_NO;
     pic = NULL;
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
     return;
   }
 
   if ( (GNUNET_NO == iterate_all) &&
-       (GNUNET_NO == GNUNET_TRANSPORT_is_connected(state)) )
+       (GNUNET_NO == GNUNET_TRANSPORT_is_connected(state)))
       return; /* Display only connected peers */
 
-  if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
+  if (NULL != op_timeout)
     GNUNET_SCHEDULER_cancel (op_timeout);
-  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
+  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
+                                             &operation_timeout,
                                              NULL);
 
-  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
-             "Received address for peer `%s': %s\n",
-             GNUNET_i2s (peer), address->transport_name);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received address for peer `%s': %s\n",
+              GNUNET_i2s (peer),
+              address ? address->transport_name : "");
 
   if (NULL != address)
-    resolve_peer_address (peer, address, numeric, state, state_timeout);
+    resolve_peer_address (address,
+                         numeric,
+                         state,
+                         state_timeout);
   else
-    print_info (peer, NULL, NULL, state, state_timeout);
+    print_info (peer,
+               NULL,
+               NULL,
+               state,
+               state_timeout);
 }
 
 
 /**
- * Function called with information about a peers
+ * Context for address resolution by #plugin_monitoring_cb().
+ */
+struct PluginMonitorAddress
+{
+
+  /**
+   * Ongoing resolution request.
+   */
+  struct GNUNET_TRANSPORT_AddressToStringContext *asc;
+
+  /**
+   * Resolved address as string.
+   */
+  char *str;
+
+  /**
+   * Last event we got and did not yet print because
+   * @e str was NULL (address not yet resolved).
+   */
+  struct GNUNET_TRANSPORT_SessionInfo si;
+};
+
+
+/**
+ * Print information about a plugin monitoring event.
+ *
+ * @param addr out internal context
+ * @param info the monitoring information
+ */
+static void
+print_plugin_event_info (struct PluginMonitorAddress *addr,
+                        const struct GNUNET_TRANSPORT_SessionInfo *info)
+{
+  const char *state;
+
+  switch (info->state)
+  {
+  case GNUNET_TRANSPORT_SS_INIT:
+    state = "INIT";
+    break;
+  case GNUNET_TRANSPORT_SS_HANDSHAKE:
+    state = "HANDSHAKE";
+    break;
+  case GNUNET_TRANSPORT_SS_UP:
+    state = "UP";
+    break;
+  case GNUNET_TRANSPORT_SS_UPDATE:
+    state = "UPDATE";
+    break;
+  case GNUNET_TRANSPORT_SS_DONE:
+    state = "DONE";
+    break;
+  default:
+    state = "UNKNOWN";
+    break;
+  }
+  fprintf (stdout,
+           "%s: state %s timeout in %s @ %s%s\n",
+           GNUNET_i2s (&info->address->peer),
+           state,
+           GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (info->session_timeout),
+                                                  GNUNET_YES),
+          addr->str,
+           (info->is_inbound == GNUNET_YES) ? " (INBOUND)" : "");
+  fprintf (stdout,
+           "%s: queue has %3u messages and %6u bytes\n",
+           GNUNET_i2s (&info->address->peer),
+           info->num_msg_pending,
+           info->num_bytes_pending);
+  if (0 != GNUNET_TIME_absolute_get_remaining (info->receive_delay).rel_value_us)
+    fprintf (stdout,
+            "%s: receiving blocked until %s\n",
+            GNUNET_i2s (&info->address->peer),
+            GNUNET_STRINGS_absolute_time_to_string (info->receive_delay));
+}
+
+
+/**
+ * Function called with a textual representation of an address.  This
+ * function will be called several times with different possible
+ * textual representations, and a last time with @a address being NULL
+ * to signal the end of the iteration.  Note that @a address NULL
+ * always is the last call, regardless of the value in @a res.
  *
  * @param cls closure
+ * @param address NULL on end of iteration,
+ *        otherwise 0-terminated printable UTF-8 string,
+ *        in particular an empty string if @a res is #GNUNET_NO
+ * @param res result of the address to string conversion:
+ *        if #GNUNET_OK: conversion successful
+ *        if #GNUNET_NO: address was invalid (or not supported)
+ *        if #GNUNET_SYSERR: communication error (IPC error)
+ */
+static void
+address_cb (void *cls,
+            const char *address,
+            int res)
+{
+  struct PluginMonitorAddress *addr = cls;
+
+  if (NULL == address)
+  {
+    addr->asc = NULL;
+    return;
+  }
+  if (NULL != addr->str)
+    return;
+  addr->str = GNUNET_strdup (address);
+  print_plugin_event_info (addr,
+                          &addr->si);
+}
+
+
+/**
+ * Function called by the plugin with information about the
+ * current sessions managed by the plugin (for monitoring).
+ *
+ * @param cls closure (NULL)
+ * @param session session handle this information is about,
+ *        NULL to indicate that we are "in sync" (initial
+ *        iteration complete)
+ * @param session_ctx storage location where the application
+ *        can store data; will point to NULL on #GNUNET_TRANSPORT_SS_INIT,
+ *        and must be reset to NULL on #GNUNET_TRANSPORT_SS_DONE
+ * @param info information about the state of the session,
+ *        NULL if @a session is also NULL and we are
+ *        merely signalling that the initial iteration is over;
+ *        NULL with @a session being non-NULL if the monitor
+ *        was being cancelled while sessions were active
+ */
+static void
+plugin_monitoring_cb (void *cls,
+                      struct GNUNET_TRANSPORT_PluginSession *session,
+                      void **session_ctx,
+                      const struct GNUNET_TRANSPORT_SessionInfo *info)
+{
+  struct PluginMonitorAddress *addr;
+
+  if ( (NULL == info) &&
+       (NULL == session) )
+    return; /* in sync with transport service */
+  addr = *session_ctx;
+  if (NULL == info)
+  {
+    if (NULL != addr)
+    {
+      if (NULL != addr->asc)
+      {
+        GNUNET_TRANSPORT_address_to_string_cancel (addr->asc);
+        addr->asc = NULL;
+      }
+      GNUNET_free_non_null (addr->str);
+      GNUNET_free (addr);
+      *session_ctx = NULL;
+    }
+    return; /* shutdown */
+  }
+  if (0 != memcmp (&info->address->peer,
+                   &pid,
+                   sizeof (struct GNUNET_PeerIdentity)))
+    return; /* filtered */
+  if (NULL == addr)
+  {
+    addr = GNUNET_new (struct PluginMonitorAddress);
+    addr->asc = GNUNET_TRANSPORT_address_to_string (cfg,
+                                                    info->address,
+                                                    numeric,
+                                                    GNUNET_TIME_UNIT_FOREVER_REL,
+                                                    &address_cb,
+                                                    addr);
+    *session_ctx = addr;
+  }
+  if (NULL == addr->str)
+    addr->si = *info;
+  else
+    print_plugin_event_info (addr,
+                            info);
+  if (GNUNET_TRANSPORT_SS_DONE == info->state)
+  {
+    if (NULL != addr->asc)
+    {
+      GNUNET_TRANSPORT_address_to_string_cancel (addr->asc);
+      addr->asc = NULL;
+    }
+    GNUNET_free_non_null (addr->str);
+    GNUNET_free (addr);
+    *session_ctx = NULL;
+  }
+}
+
+
+/**
+ * Function called with information about a peers
+ *
+ * @param cls closure, NULL
  * @param peer identity of the peer, NULL for final callback when operation done
  * @param address binary address used to communicate with this peer,
  *  NULL on disconnect or when done
  * @param state current state this peer is in
  * @param state_timeout time out for the current state
- *
  */
 static void
 process_peer_monitoring_cb (void *cls,
@@ -1219,27 +1145,34 @@ process_peer_monitoring_cb (void *cls,
     return;
   }
 
-  if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
+  if (NULL != op_timeout)
     GNUNET_SCHEDULER_cancel (op_timeout);
-  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
+  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
+                                             &operation_timeout,
                                              NULL);
 
-  if (NULL == (m = GNUNET_CONTAINER_multipeermap_get (monitored_peers, peer)))
+  if (NULL == (m = GNUNET_CONTAINER_multipeermap_get (monitored_peers,
+                                                     peer)))
   {
     m = GNUNET_new (struct MonitoredPeer);
-    GNUNET_CONTAINER_multipeermap_put (monitored_peers, peer,
-        m, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
+    GNUNET_CONTAINER_multipeermap_put (monitored_peers,
+                                      peer,
+                                      m,
+                                      GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
   }
   else
   {
     if ( (m->state == state) &&
-      (m->state_timeout.abs_value_us == state_timeout.abs_value_us) &&
-      ((NULL == address) && (NULL == m->address)) )
+        (m->state_timeout.abs_value_us == state_timeout.abs_value_us) &&
+        (NULL == address) &&
+        (NULL == m->address) )
     {
       return; /* No real change */
     }
-    if ( (m->state == state) && ((NULL != address) && (NULL != m->address)) &&
-        (0 == GNUNET_HELLO_address_cmp(m->address, address)) )
+    if ( (m->state == state) &&
+        (NULL != address) &&
+        (NULL != m->address) &&
+        (0 == GNUNET_HELLO_address_cmp(m->address, address)) )
       return; /* No real change */
   }
 
@@ -1254,251 +1187,225 @@ process_peer_monitoring_cb (void *cls,
   m->state_timeout = state_timeout;
 
   if (NULL != address)
-    resolve_peer_address (peer, m->address, numeric, m->state, m->state_timeout);
+    resolve_peer_address (m->address,
+                          numeric,
+                          m->state,
+                          m->state_timeout);
   else
-    print_info (peer, NULL, NULL, m->state, m->state_timeout);
+    print_info (peer,
+                NULL,
+                NULL,
+                m->state,
+                m->state_timeout);
 }
 
-static void
-try_connect_cb (void *cls, const int result)
-{
-  static int retries = 0;
-  if (GNUNET_OK == result)
-  {
-    tc_handle = NULL;
-    return;
-  }
-  retries++;
-  if (retries < 10)
-    tc_handle = GNUNET_TRANSPORT_try_connect (handle, &pid, try_connect_cb,
-        NULL );
-  else
-  {
-    FPRINTF (stderr, "%s",
-        _("Failed to send connect request to transport service\n") );
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    ret = 1;
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    return;
-  }
-}
 
-static void
-try_disconnect_cb (void *cls, const int result)
+/**
+ * Function called with the transport service checking if we
+ * want to blacklist a peer. Return #GNUNET_SYSERR for the
+ * peer that we should disconnect from.
+ *
+ * @param cls NULL
+ * @param cpid peer to check blacklisting for
+ * @return #GNUNET_OK if the connection is allowed, #GNUNET_SYSERR if not
+ */
+static int
+blacklist_cb (void *cls,
+              const struct GNUNET_PeerIdentity *cpid)
 {
-  static int retries = 0;
-  if (GNUNET_OK == result)
-  {
-    tc_handle = NULL;
-    return;
-  }
-  retries++;
-  if (retries < 10)
-    tc_handle = GNUNET_TRANSPORT_try_disconnect (handle, &pid, try_disconnect_cb,
-        NULL );
-  else
-  {
-    FPRINTF (stderr, "%s",
-        _("Failed to send connect request to transport service\n") );
-    if (GNUNET_SCHEDULER_NO_TASK != end)
-      GNUNET_SCHEDULER_cancel (end);
-    ret = 1;
-    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
-    return;
-  }
+  if (0 == memcmp (cpid,
+                   &pid,
+                   sizeof (struct GNUNET_PeerIdentity)))
+    return GNUNET_SYSERR;
+  return GNUNET_OK;
 }
 
+
 /**
- * Function called with the result of the check if the 'transport'
- * service is running.
+ * Main function that will be run by the scheduler.
  *
- * @param cls closure with our configuration
- * @param result #GNUNET_YES if transport is running
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param mycfg configuration
  */
 static void
-testservice_task (void *cls, int result)
+run (void *cls,
+     char * const *args,
+     const char *cfgfile,
+     const struct GNUNET_CONFIGURATION_Handle *mycfg)
 {
+  static struct GNUNET_PeerIdentity zero_pid;
   int counter = 0;
   ret = 1;
 
-  if (GNUNET_YES != result)
-  {
-    FPRINTF (stderr, _("Service `%s' is not running\n"), "transport");
-    return;
-  }
-
-  if ((NULL != cpid)
-      && (GNUNET_OK
-          != GNUNET_CRYPTO_eddsa_public_key_from_string (cpid, strlen (cpid),
-              &pid.public_key)))
-  {
-    FPRINTF (stderr, _("Failed to parse peer identity `%s'\n"), cpid);
-    return;
-  }
+  cfg = (struct GNUNET_CONFIGURATION_Handle *) mycfg;
 
   counter = benchmark_send + benchmark_receive + iterate_connections
-      + monitor_connections + monitor_connects + try_connect + try_disconnect +
-      + iterate_validation + monitor_validation;
+      + monitor_connections + monitor_connects + do_disconnect +
+      monitor_plugins;
 
   if (1 < counter)
   {
     FPRINTF (stderr,
-        _("Multiple operations given. Please choose only one operation: %s, %s, %s, %s, %s, %s\n"),
-        "connect", "benchmark send", "benchmark receive", "information",
-        "monitor", "events");
+             _("Multiple operations given. Please choose only one operation: %s, %s, %s, %s, %s, %s %s\n"),
+             "disconnect",
+            "benchmark send",
+            "benchmark receive",
+            "information",
+             "monitor",
+            "events",
+            "plugins");
     return;
   }
   if (0 == counter)
   {
     FPRINTF (stderr,
-        _("No operation given. Please choose one operation: %s, %s, %s, %s, %s, %s\n"),
-        "connect", "benchmark send", "benchmark receive", "information",
-        "monitor", "events");
+            _("No operation given. Please choose one operation: %s, %s, %s, %s, %s, %s, %s\n"),
+             "disconnect",
+            "benchmark send",
+            "benchmark receive",
+            "information",
+             "monitor",
+            "events",
+            "plugins");
     return;
   }
 
-  if (try_connect) /* -C: Connect to peer */
-  {
-    if (NULL == cpid)
-    {
-      FPRINTF (stderr, _("Option `%s' makes no sense without option `%s'.\n"),
-          "-C", "-p");
-      ret = 1;
-      return;
-    }
-    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, &notify_receive,
-        &notify_connect, &notify_disconnect);
-    if (NULL == handle)
-    {
-      FPRINTF (stderr, "%s", _("Failed to connect to transport service\n") );
-      ret = 1;
-      return;
-    }
-    tc_handle = GNUNET_TRANSPORT_try_connect (handle, &pid, try_connect_cb,
-        NULL );
-    if (NULL == tc_handle)
-    {
-      FPRINTF (stderr, "%s",
-          _("Failed to send request to transport service\n") );
-      ret = 1;
-      return;
-    }
-    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
-        NULL );
-
-  }
-  else if (try_disconnect) /* -D: Disconnect from peer */
+  if (do_disconnect) /* -D: Disconnect from peer */
   {
-    if (NULL == cpid)
+    if (0 == memcmp (&zero_pid,
+                     &pid,
+                     sizeof (pid)))
     {
-      FPRINTF (stderr, _("Option `%s' makes no sense without option `%s'.\n"),
-          "-D", "-p");
-      ret = 1;
-      return;
-    }
-    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, &notify_receive,
-        &notify_connect, &notify_disconnect);
-    if (NULL == handle)
-    {
-      FPRINTF (stderr, "%s", _("Failed to connect to transport service\n") );
+      FPRINTF (stderr,
+               _("Option `%s' makes no sense without option `%s'.\n"),
+               "-D", "-p");
       ret = 1;
       return;
     }
-    tc_handle = GNUNET_TRANSPORT_try_disconnect (handle, &pid, try_disconnect_cb,
-        NULL );
-    if (NULL == tc_handle)
+    blacklist = GNUNET_TRANSPORT_blacklist (cfg,
+                                            &blacklist_cb,
+                                            NULL);
+    if (NULL == blacklist)
     {
-      FPRINTF (stderr, "%s",
-          _("Failed to send request to transport service\n") );
+      FPRINTF (stderr,
+               "%s",
+               _("Failed to connect to transport service for disconnection\n"));
       ret = 1;
       return;
     }
-    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
-        NULL );
-
+    FPRINTF (stdout,
+             "%s",
+             _("Blacklisting request in place, stop with CTRL-C\n"));
   }
   else if (benchmark_send) /* -s: Benchmark sending */
   {
-    if (NULL == cpid)
+    if (0 == memcmp (&zero_pid,
+                     &pid,
+                     sizeof (pid)))
     {
-      FPRINTF (stderr, _("Option `%s' makes no sense without option `%s'.\n"),
-          "-s", "-p");
+      FPRINTF (stderr,
+              _("Option `%s' makes no sense without option `%s'.\n"),
+              "-s", "-p");
       ret = 1;
       return;
     }
-    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, &notify_receive,
-        &notify_connect, &notify_disconnect);
+    handle = GNUNET_TRANSPORT_core_connect (cfg,
+                                           NULL,
+                                           NULL,
+                                           NULL,
+                                           &notify_connect,
+                                           &notify_disconnect,
+                                           NULL);
     if (NULL == handle)
     {
-      FPRINTF (stderr, "%s", _("Failed to connect to transport service\n") );
-      ret = 1;
-      return;
-    }
-    tc_handle = GNUNET_TRANSPORT_try_connect (handle, &pid, try_connect_cb,
-        NULL );
-    if (NULL == tc_handle)
-    {
-      FPRINTF (stderr, "%s",
-          _("Failed to send request to transport service\n") );
+      FPRINTF (stderr,
+              "%s",
+              _("Failed to connect to transport service\n"));
       ret = 1;
       return;
     }
     start_time = GNUNET_TIME_absolute_get ();
-    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
-        NULL );
+    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
+                                               &operation_timeout,
+                                               NULL);
   }
   else if (benchmark_receive) /* -b: Benchmark receiving */
   {
-    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, &notify_receive, NULL,
-        NULL );
+    struct GNUNET_MQ_MessageHandler handlers[] = {
+      GNUNET_MQ_hd_var_size (dummy,
+                             GNUNET_MESSAGE_TYPE_DUMMY,
+                             struct GNUNET_MessageHeader,
+                             NULL),
+      GNUNET_MQ_handler_end ()
+    };
+
+    handle = GNUNET_TRANSPORT_core_connect (cfg,
+                                           NULL,
+                                           handlers,
+                                           NULL,
+                                           NULL,
+                                           NULL,
+                                           NULL);
     if (NULL == handle)
     {
-      FPRINTF (stderr, "%s", _("Failed to connect to transport service\n") );
+      FPRINTF (stderr,
+              "%s",
+              _("Failed to connect to transport service\n"));
       ret = 1;
       return;
     }
     if (verbosity > 0)
-      FPRINTF (stdout, "%s", _("Starting to receive benchmark data\n") );
+      FPRINTF (stdout,
+              "%s",
+              _("Starting to receive benchmark data\n"));
     start_time = GNUNET_TIME_absolute_get ();
 
   }
   else if (iterate_connections) /* -i: List information about peers once */
   {
-    address_resolution_in_progress = GNUNET_YES;
-    pic = GNUNET_TRANSPORT_monitor_peers (cfg, (NULL == cpid) ? NULL : &pid,
-        GNUNET_YES, TIMEOUT, &process_peer_iteration_cb, (void *) cfg);
-    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
-        NULL );
+    pic = GNUNET_TRANSPORT_monitor_peers (cfg,
+                                          &pid,
+                                          GNUNET_YES,
+                                          &process_peer_iteration_cb,
+                                          (void *) cfg);
+    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
+                                               &operation_timeout,
+                                               NULL);
   }
   else if (monitor_connections) /* -m: List information about peers continuously */
   {
-    monitored_peers = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
-    address_resolution_in_progress = GNUNET_YES;
-    pic = GNUNET_TRANSPORT_monitor_peers (cfg, (NULL == cpid) ? NULL : &pid,
-        GNUNET_NO, TIMEOUT, &process_peer_monitoring_cb, (void *) cfg);
-  }
-  else if (iterate_validation) /* -d: Print information about validations */
-  {
-    vic = GNUNET_TRANSPORT_monitor_validation_entries (cfg,
-        (NULL == cpid) ? NULL : &pid,
-        GNUNET_YES, TIMEOUT, &process_validation_cb, (void *) cfg);
+    monitored_peers = GNUNET_CONTAINER_multipeermap_create (10,
+                                                           GNUNET_NO);
+    pic = GNUNET_TRANSPORT_monitor_peers (cfg,
+                                         &pid,
+                                          GNUNET_NO,
+                                          &process_peer_monitoring_cb,
+                                          NULL);
   }
-  else if (monitor_validation) /* -f: Print information about validations continuously */
+  else if (monitor_plugins) /* -P: List information about plugins continuously */
   {
-    vic = GNUNET_TRANSPORT_monitor_validation_entries (cfg,
-        (NULL == cpid) ? NULL : &pid,
-        GNUNET_NO, TIMEOUT, &process_validation_cb, (void *) cfg);
+    monitored_plugins = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
+    pm = GNUNET_TRANSPORT_monitor_plugins (cfg,
+                                           &plugin_monitoring_cb,
+                                           NULL);
   }
   else if (monitor_connects) /* -e : Monitor (dis)connect events continuously */
   {
     monitor_connect_counter = 0;
-    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, NULL,
-                                       &monitor_notify_connect,
-                                       &monitor_notify_disconnect);
+    handle = GNUNET_TRANSPORT_core_connect (cfg,
+                                           NULL,
+                                           NULL,
+                                           NULL,
+                                           &monitor_notify_connect,
+                                           &monitor_notify_disconnect,
+                                           NULL);
     if (NULL == handle)
     {
-      FPRINTF (stderr, "%s", _("Failed to connect to transport service\n") );
+      FPRINTF (stderr,
+               "%s",
+               _("Failed to connect to transport service\n"));
       ret = 1;
       return;
     }
@@ -1510,84 +1417,72 @@ testservice_task (void *cls, int result)
     return;
   }
 
-  end = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
-      &shutdown_task, NULL );
-
+  GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
+                                NULL);
 }
 
-/**
- * Main function that will be run by the scheduler.
- *
- * @param cls closure
- * @param args remaining command-line arguments
- * @param cfgfile name of the configuration file used (for saving, can be NULL!)
- * @param mycfg configuration
- */
-static void
-run (void *cls, char * const *args, const char *cfgfile,
-    const struct GNUNET_CONFIGURATION_Handle *mycfg)
-{
-  cfg = (struct GNUNET_CONFIGURATION_Handle *) mycfg;
-  if (test_configuration)
-  {
-    do_test_configuration (cfg);
-    return;
-  }
-  GNUNET_CLIENT_service_test ("transport", cfg, GNUNET_TIME_UNIT_SECONDS,
-      &testservice_task, (void *) cfg);
-}
 
 int
-main (int argc, char * const *argv)
+main (int argc,
+      char * const *argv)
 {
   int res;
-  static const struct GNUNET_GETOPT_CommandLineOption options[] =
-      {
-          { 'a', "all", NULL,
-              gettext_noop ("print information for all peers (instead of only connected peers )"),
-              0, &GNUNET_GETOPT_set_one, &iterate_all },
-          { 'b', "benchmark", NULL,
-              gettext_noop ("measure how fast we are receiving data from all peers (until CTRL-C)"),
-              0, &GNUNET_GETOPT_set_one, &benchmark_receive },
-          { 'C', "connect",
-              NULL, gettext_noop ("connect to a peer"), 0,
-              &GNUNET_GETOPT_set_one, &try_connect },
-          { 'D', "disconnect",
-              NULL, gettext_noop ("disconnect to a peer"), 0,
-              &GNUNET_GETOPT_set_one, &try_disconnect },
-          { 'd', "validation", NULL,
-              gettext_noop ("print information for all pending validations "),
-              0, &GNUNET_GETOPT_set_one, &iterate_validation },
-          { 'f', "monitorvalidation", NULL,
-              gettext_noop ("print information for all pending validations continously"),
-              0, &GNUNET_GETOPT_set_one, &monitor_validation },
-          { 'i', "information", NULL,
-              gettext_noop ("provide information about all current connections (once)"),
-              0, &GNUNET_GETOPT_set_one, &iterate_connections },
-          { 'm', "monitor", NULL,
-              gettext_noop ("provide information about all current connections (continuously)"),
-              0, &GNUNET_GETOPT_set_one, &monitor_connections },
-          { 'e', "events", NULL,
-              gettext_noop ("provide information about all connects and disconnect events (continuously)"),
-              0, &GNUNET_GETOPT_set_one, &monitor_connects }, { 'n', "numeric",
-              NULL, gettext_noop ("do not resolve hostnames"), 0,
-              &GNUNET_GETOPT_set_one, &numeric }, { 'p', "peer", "PEER",
-              gettext_noop ("peer identity"), 1, &GNUNET_GETOPT_set_string,
-              &cpid }, { 's', "send", NULL, gettext_noop
-          ("send data for benchmarking to the other peer (until CTRL-C)"), 0,
-              &GNUNET_GETOPT_set_one, &benchmark_send },
-          { 't', "test", NULL,
-              gettext_noop ("test transport configuration (involves external server)"),
-              0, &GNUNET_GETOPT_set_one, &test_configuration },
-              GNUNET_GETOPT_OPTION_VERBOSE (&verbosity),
-              GNUNET_GETOPT_OPTION_END };
+  struct GNUNET_GETOPT_CommandLineOption options[] = {
+    GNUNET_GETOPT_option_flag ('a',
+                                  "all",
+                                  gettext_noop ("print information for all peers (instead of only connected peers)"),
+                                  &iterate_all),
+    GNUNET_GETOPT_option_flag ('b',
+                                  "benchmark",
+                                  gettext_noop ("measure how fast we are receiving data from all peers (until CTRL-C)"),
+                                  &benchmark_receive),
+    GNUNET_GETOPT_option_flag ('D',
+                                  "disconnect",
+                                  gettext_noop ("disconnect from a peer"),
+                                  &do_disconnect),
+    GNUNET_GETOPT_option_flag ('i',
+                                  "information",
+                                  gettext_noop ("provide information about all current connections (once)"),
+                                  &iterate_connections),
+    GNUNET_GETOPT_option_flag ('m',
+                                  "monitor",
+                                  gettext_noop ("provide information about all current connections (continuously)"),
+                                  &monitor_connections),
+    GNUNET_GETOPT_option_flag ('e',
+                                  "events",
+                                  gettext_noop ("provide information about all connects and disconnect events (continuously)"),
+                                  &monitor_connects),
+    GNUNET_GETOPT_option_flag ('n',
+                                  "numeric",
+                                  gettext_noop ("do not resolve hostnames"),
+                                  &numeric),
+    GNUNET_GETOPT_option_base32_auto ('p',
+                                          "peer",
+                                          "PEER",
+                                          gettext_noop ("peer identity"),
+                                          &pid),
+    GNUNET_GETOPT_option_flag ('P',
+                                  "plugins",
+                                  gettext_noop ("monitor plugin sessions"),
+                                  &monitor_plugins),
+    GNUNET_GETOPT_option_flag ('s',
+                                  "send",
+                                  gettext_noop
+      ("send data for benchmarking to the other peer (until CTRL-C)"),
+                                  &benchmark_send),
+    GNUNET_GETOPT_option_verbose (&verbosity),
+    GNUNET_GETOPT_OPTION_END
+  };
 
   if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
     return 2;
 
-  res = GNUNET_PROGRAM_run (argc, argv, "gnunet-transport", gettext_noop
-  ("Direct access to transport service."), options, &run, NULL );
-  GNUNET_free((void * ) argv);
+  res = GNUNET_PROGRAM_run (argc, argv,
+                            "gnunet-transport",
+                            gettext_noop ("Direct access to transport service."),
+                            options,
+                            &run, NULL);
+  GNUNET_free ((void *) argv);
   if (GNUNET_OK == res)
     return ret;
   return 1;