-indentation
[oweals/gnunet.git] / src / transport / gnunet-transport.c
index 684b5a92cbbe23621f277cff11c6855dcd378705..8cd606f81f4e473a8bc359ff35f0ce200f196995 100644 (file)
@@ -39,7 +39,7 @@
  * How long do we wait for the NAT test to report success?
  * Should match NAT_SERVER_TIMEOUT in 'nat_test.c'.
  */
-#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 20)
 #define RESOLUTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
 #define OP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
 
@@ -123,6 +123,11 @@ static int monitor_validation;
  */
 static int try_connect;
 
+/**
+ * Option -D.
+ */
+static int try_disconnect;
+
 /**
  * Option -n.
  */
@@ -258,6 +263,45 @@ struct TestContext
 
 };
 
+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;
@@ -266,17 +310,21 @@ struct MonitoredPeer
 };
 
 
- int destroy_it (void *cls,
-    const struct GNUNET_PeerIdentity *key,
-    void *value)
+static int
+destroy_it (void *cls,
+            const struct GNUNET_PeerIdentity *key,
+            void *value)
 {
-   struct MonitoredPeer *m = value;
-   GNUNET_CONTAINER_multipeermap_remove (monitored_peers, key, value);
-   GNUNET_free_non_null (m->address);
-   GNUNET_free (value);
-   return GNUNET_OK;
+  struct MonitoredPeer *m = 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;
 }
 
+
 /**
  * Task run in monitor mode when the user presses CTRL-C to abort.
  * Stops monitoring activity.
@@ -288,6 +336,8 @@ static void
 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
   struct GNUNET_TIME_Relative duration;
+  struct ValidationResolutionContext *cur;
+  struct ValidationResolutionContext *next;
   end = GNUNET_SCHEDULER_NO_TASK;
   if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
   {
@@ -309,6 +359,19 @@ shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
     GNUNET_TRANSPORT_monitor_validation_entries_cancel (vic);
     vic = NULL;
   }
+
+  next = vc_head;
+  for (cur = next; NULL != cur; cur = next)
+  {
+    next = cur->next;
+
+    GNUNET_TRANSPORT_address_to_string_cancel (cur->asc);
+    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)
   {
     GNUNET_TRANSPORT_notify_transmit_ready_cancel (th);
@@ -360,26 +423,7 @@ struct PeerResolutionContext
   int printed;
 };
 
-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;
-};
 
 static void
 operation_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
@@ -432,8 +476,33 @@ run_nat_test ();
  * @param result #GNUNET_YES on success
  */
 static void
-display_test_result (struct TestContext *tc, int result)
+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);
@@ -468,122 +537,143 @@ display_test_result (struct TestContext *tc, int result)
 }
 
 /**
- * Function called by NAT on success.
- * Clean up and update GUI (with success).
+ * Function called by NAT to report the outcome of the nat-test.
+ * Clean up and update GUI.
  *
  * @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)
+result_callback (void *cls, enum GNUNET_NAT_FailureCode result)
 {
   struct TestContext *tc = cls;
-  display_test_result (tc, success);
+  display_test_result (tc, result);
 }
 
-/**
- * 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;
+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);
 
-  tstc->tsk = GNUNET_SCHEDULER_NO_TASK;
-  display_test_result (tstc, GNUNET_NO);
-}
 
 
+/**
+ * Function to call with a textual representation of an address.  This
+ * function will be called several times with different possible
+ * textual representations, and a last time with @address being NULL
+ * to signal the end of the iteration.  Note that @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
-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)
+process_validation_string (void *cls,
+                           const char *address,
+                           int res)
 {
   struct ValidationResolutionContext *vc = cls;
   char *s_valid;
   char *s_last;
   char *s_next;
 
-  if (address != NULL )
+  if (NULL != address)
   {
+    if (GNUNET_SYSERR == res)
+    {
+      FPRINTF (stderr,
+               "Failed to convert address for peer `%s' plugin `%s' length %lu to string \n",
+               GNUNET_i2s (&vc->id),
+               vc->addrcp->transport_name,
+               vc->addrcp->address_length);
+    }
     if (GNUNET_TIME_UNIT_ZERO_ABS.abs_value_us == vc->valid_until.abs_value_us)
-      s_valid = GNUNET_strdup("never");
+      s_valid = GNUNET_strdup ("never");
     else
-      s_valid = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string (vc->valid_until));
+      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");
+      s_last = GNUNET_strdup ("never");
     else
-      s_last = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string (vc->last_validation));
+      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");
+      s_next = GNUNET_strdup ("never");
     else
-      s_next = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string (vc->next_validation));
+      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);
+             _("Peer `%s' %s %s\n\t%s%s\n\t%s%s\n\t%s%s\n"),
+             GNUNET_i2s (&vc->id),
+             (GNUNET_OK == res) ? address : "<invalid 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;
+    return;
   }
-  else
+  /* last call, we are done */
+  GNUNET_assert (address_resolutions > 0);
+  address_resolutions--;
+  if ( (GNUNET_SYSERR == res) &&
+       (GNUNET_NO == vc->printed) )
   {
-    /* done */
-    GNUNET_assert(address_resolutions > 0);
-    address_resolutions--;
-    if (GNUNET_NO == vc->printed)
+    if (numeric == GNUNET_NO)
     {
-      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));
-      }
+      /* Failed to resolve address, try numeric lookup
+         (note: this should be unnecessary, as
+         transport should fallback to numeric lookup
+         internally if DNS takes too long anyway) */
+      resolve_validation_address (&vc->id,
+                                  vc->addrcp,
+                                  GNUNET_NO,
+                                  vc->last_validation,
+                                  vc->valid_until,
+                                  vc->next_validation,
+                                  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))
+    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 );
+      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);
   }
 }
 
@@ -591,11 +681,12 @@ process_validation_string (void *cls, const char *address)
 
 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)
+                            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;
 
@@ -614,21 +705,33 @@ resolve_validation_address (const struct GNUNET_PeerIdentity *id,
   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);
+  vc->asc = GNUNET_TRANSPORT_address_to_string (cfg,
+                                                address,
+                                                numeric,
+                                                RESOLUTION_TIMEOUT,
+                                                &process_validation_string, vc);
 }
 
 
-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)
+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)
@@ -650,22 +753,23 @@ void process_validation_cb (void *cls,
      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,
+      TIMEOUT,
       &result_callback, head);
-  if (NULL == head->tst)
-  {
-    display_test_result (head, GNUNET_SYSERR);
-    return;
-  }
-  head->tsk = GNUNET_SCHEDULER_add_delayed (TIMEOUT, &fail_timeout, head);
 }
 
+
 /**
  * Test our plugin's configuration (NAT traversal, etc.).
  *
@@ -703,8 +807,7 @@ do_test_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg)
           _("No port configured for plugin `%s', cannot test it\n"), tok);
       continue;
     }
-    if (GNUNET_OK
-        != GNUNET_CONFIGURATION_get_value_number (cfg, section,
+    if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (cfg, section,
             "ADVERTISED_PORT", &adv_port))
       adv_port = bnd_port;
 
@@ -724,6 +827,12 @@ do_test_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg)
                                         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 ();
@@ -768,6 +877,7 @@ transmit_data (void *cls, size_t size, void *buf)
   return size;
 }
 
+
 /**
  * Function called to notify transport users that another
  * peer connected to us.
@@ -831,11 +941,31 @@ notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
  * @param peer the peer that disconnected
  */
 static void
-notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+notify_disconnect (void *cls,
+                   const struct GNUNET_PeerIdentity *peer)
 {
   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);
@@ -859,16 +989,22 @@ notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
  * @param peer the peer that connected
  */
 static void
-monitor_notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
+monitor_notify_connect (void *cls,
+                        const struct GNUNET_PeerIdentity *peer)
 {
   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);
+  FPRINTF (stdout,
+           _("%24s: %-17s %4s   (%u connections in total)\n"),
+           now_str,
+           _("Connected to"),
+           GNUNET_i2s (peer),
+           monitor_connect_counter);
 }
 
+
 /**
  * Function called to notify transport users that another
  * peer disconnected from us.
@@ -877,7 +1013,8 @@ monitor_notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
  * @param peer the peer that disconnected
  */
 static void
-monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
+monitor_notify_disconnect (void *cls,
+                           const struct GNUNET_PeerIdentity *peer)
 {
   struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
   const char *now_str = GNUNET_STRINGS_absolute_time_to_string (now);
@@ -885,10 +1022,15 @@ 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);
 }
 
+
 /**
  * Function called by the transport for each received message.
  *
@@ -897,16 +1039,19 @@ monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
  * @param message the message
  */
 static void
-notify_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
-    const struct GNUNET_MessageHeader *message)
+notify_receive (void *cls,
+                const struct GNUNET_PeerIdentity *peer,
+                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));
+      FPRINTF (stdout,
+               _("Received %u bytes from %s\n"),
+               (unsigned int) ntohs (message->size),
+               GNUNET_i2s (peer));
 
     if (traffic_received == 0)
       start_time = GNUNET_TIME_absolute_get ();
@@ -915,90 +1060,155 @@ notify_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
   }
 }
 
+
 static void
 resolve_peer_address (const struct GNUNET_PeerIdentity *id,
-    const struct GNUNET_HELLO_Address *address, int numeric,
-    enum GNUNET_TRANSPORT_PeerState state,
-    struct GNUNET_TIME_Absolute state_timeout);
+                      const struct GNUNET_HELLO_Address *address,
+                      int numeric,
+                      enum GNUNET_TRANSPORT_PeerState state,
+                      struct GNUNET_TIME_Absolute state_timeout);
+
 
 static void
-print_info (const struct GNUNET_PeerIdentity *id, const char *transport,
-    const char *addr, enum GNUNET_TRANSPORT_PeerState state,
-    struct GNUNET_TIME_Absolute state_timeout)
+print_info (const struct GNUNET_PeerIdentity *id,
+            const char *transport,
+            const char *addr,
+            enum GNUNET_TRANSPORT_PeerState state,
+            struct GNUNET_TIME_Absolute state_timeout)
 {
-  if ((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
+  else if ( (GNUNET_YES == iterate_connections) &&
+             (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 @address being NULL
+ * to signal the end of the iteration.  Note that @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)
+  {
+    if (GNUNET_SYSERR == res)
+    {
+      FPRINTF (stderr,
+               "Failed to convert address for peer `%s' plugin `%s' length %lu to string \n",
+               GNUNET_i2s (&rc->id),
+               rc->addrcp->transport_name,
+               rc->addrcp->address_length);
+      print_info (&rc->id,
+                  rc->transport,
+                  NULL,
+                  rc->state,
+                  rc->state_timeout);
+      rc->printed = GNUNET_YES;
+      return;
+    }
+    if (GNUNET_OK == res)
+    {
+      print_info (&rc->id,
+                  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;
+  }
+  /* NULL == address, last call, we are done */
+
+  GNUNET_assert (address_resolutions > 0);
+  address_resolutions--;
+  if (GNUNET_NO == rc->printed)
   {
-    print_info (&rc->id, rc->transport, address, rc->state, rc->state_timeout);
-    rc->printed = GNUNET_YES;
+    if (numeric == GNUNET_NO)
+    {
+      /* 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->id,
+                            rc->addrcp,
+                            GNUNET_YES,
+                            rc->state,
+                            rc->state_timeout);
+    }
+    else
+    {
+      print_info (&rc->id,
+                  rc->transport,
+                  NULL,
+                  rc->state,
+                  rc->state_timeout);
+    }
   }
-  else
+  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))
   {
-    /* done */
-    GNUNET_assert(address_resolutions > 0);
-    address_resolutions--;
-    if (GNUNET_NO == rc->printed)
+    if (GNUNET_SCHEDULER_NO_TASK != end)
     {
-      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);
-      }
+      GNUNET_SCHEDULER_cancel (end);
+      end = GNUNET_SCHEDULER_NO_TASK;
     }
-    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 (GNUNET_SCHEDULER_NO_TASK != op_timeout)
     {
-      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 );
+      GNUNET_SCHEDULER_cancel (op_timeout);
+      op_timeout = GNUNET_SCHEDULER_NO_TASK;
     }
+    ret = 0;
+    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL );
   }
 }
 
+
 static void
 resolve_peer_address (const struct GNUNET_PeerIdentity *id,
-    const struct GNUNET_HELLO_Address *address, int numeric,
-    enum GNUNET_TRANSPORT_PeerState state,
-    struct GNUNET_TIME_Absolute state_timeout)
+                      const struct GNUNET_HELLO_Address *address,
+                      int numeric,
+                      enum GNUNET_TRANSPORT_PeerState state,
+                      struct GNUNET_TIME_Absolute state_timeout)
 {
   struct PeerResolutionContext *rc;
 
@@ -1014,10 +1224,14 @@ resolve_peer_address (const struct GNUNET_PeerIdentity *id,
   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);
 }
 
+
 /**
  * Function called with information about a peers during a one shot iteration
  *
@@ -1027,15 +1241,15 @@ resolve_peer_address (const struct GNUNET_PeerIdentity *id,
  *  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_iteration_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
-    const struct GNUNET_HELLO_Address *address,
-    enum GNUNET_TRANSPORT_PeerState state,
-    struct GNUNET_TIME_Absolute state_timeout)
+process_peer_iteration_cb (void *cls,
+                           const struct GNUNET_PeerIdentity *peer,
+                           const struct GNUNET_HELLO_Address *address,
+                           enum GNUNET_TRANSPORT_PeerState state,
+                           struct GNUNET_TIME_Absolute state_timeout)
 {
-  if (peer == NULL )
+  if (NULL == peer)
   {
     /* done */
     address_resolution_in_progress = GNUNET_NO;
@@ -1046,16 +1260,20 @@ process_peer_iteration_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
     return;
   }
 
-  if ((GNUNET_NO == iterate_all) && (GNUNET_NO == GNUNET_TRANSPORT_is_connected(state)) )
+  if ( (GNUNET_NO == iterate_all) &&
+       (GNUNET_NO == GNUNET_TRANSPORT_is_connected(state)) )
       return; /* Display only connected peers */
 
   if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
     GNUNET_SCHEDULER_cancel (op_timeout);
-  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
-      NULL );
+  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->transport_name);
 
   if (NULL != address)
     resolve_peer_address (peer, address, numeric, state, state_timeout);
@@ -1076,28 +1294,27 @@ process_peer_iteration_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
  *
  */
 static void
-process_peer_monitoring_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
-    const struct GNUNET_HELLO_Address *address,
-    enum GNUNET_TRANSPORT_PeerState state,
-    struct GNUNET_TIME_Absolute state_timeout)
+process_peer_monitoring_cb (void *cls,
+                            const struct GNUNET_PeerIdentity *peer,
+                            const struct GNUNET_HELLO_Address *address,
+                            enum GNUNET_TRANSPORT_PeerState state,
+                            struct GNUNET_TIME_Absolute state_timeout)
 {
   struct MonitoredPeer *m;
 
-  if (peer == NULL )
+  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 );
+    FPRINTF (stdout,
+             "%s",
+             _("Monitor disconnected from transport service. Reconnecting.\n"));
     return;
   }
 
   if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
     GNUNET_SCHEDULER_cancel (op_timeout);
-  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
-      NULL );
+  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
+                                             &operation_timeout,
+                                             NULL);
 
   if (NULL == (m = GNUNET_CONTAINER_multipeermap_get (monitored_peers, peer)))
   {
@@ -1129,15 +1346,26 @@ process_peer_monitoring_cb (void *cls, const struct GNUNET_PeerIdentity *peer,
   m->state_timeout = state_timeout;
 
   if (NULL != address)
-    resolve_peer_address (peer, m->address, numeric, m->state, m->state_timeout);
+    resolve_peer_address (peer,
+                          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)
+try_connect_cb (void *cls,
+                const int result)
 {
   static int retries = 0;
+
   if (GNUNET_OK == result)
   {
     tc_handle = NULL;
@@ -1148,6 +1376,34 @@ try_connect_cb (void *cls, const int result)
     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)
+{
+  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") );
@@ -1159,6 +1415,7 @@ try_connect_cb (void *cls, const int result)
   }
 }
 
+
 /**
  * Function called with the result of the check if the 'transport'
  * service is running.
@@ -1188,7 +1445,7 @@ testservice_task (void *cls, int result)
   }
 
   counter = benchmark_send + benchmark_receive + iterate_connections
-      + monitor_connections + monitor_connects + try_connect
+      + monitor_connections + monitor_connects + try_connect + try_disconnect +
       + iterate_validation + monitor_validation;
 
   if (1 < counter)
@@ -1237,6 +1494,36 @@ testservice_task (void *cls, int result)
     op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT, &operation_timeout,
         NULL );
 
+  }
+  else if (try_disconnect) /* -D: Disconnect from peer */
+  {
+    if (NULL == cpid)
+    {
+      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") );
+      ret = 1;
+      return;
+    }
+    tc_handle = GNUNET_TRANSPORT_try_disconnect (handle, &pid, try_disconnect_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 (benchmark_send) /* -s: Benchmark sending */
   {
@@ -1314,7 +1601,8 @@ testservice_task (void *cls, int result)
   {
     monitor_connect_counter = 0;
     handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, NULL,
-        &monitor_notify_connect, &monitor_notify_disconnect);
+                                       &monitor_notify_connect,
+                                       &monitor_notify_disconnect);
     if (NULL == handle)
     {
       FPRINTF (stderr, "%s", _("Failed to connect to transport service\n") );
@@ -1367,9 +1655,13 @@ main (int argc, char * const *argv)
               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",
+              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 },