- inital mesh_profiler commit

1 files changed, 1021 insertions, 0 deletions

diff --git a/src/mesh/mesh_profiler.c b/src/mesh/mesh_profiler.c
new file mode 100644
index 000000000..094d41c58
--- /dev/null
+++ b/src/mesh/mesh_profiler.c
@@ -0,0 +1,1021 @@
+/*
+     This file is part of GNUnet.
+     (C) 2011 Christian Grothoff (and other contributing authors)
+
+     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 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.
+
+     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.
+*/
+/**
+ * @file mesh/mesh_profiler.c
+ *
+ * @brief Profiler for mesh experiments.
+ */
+#include <stdio.h>
+#include "platform.h"
+#include "mesh_test_lib.h"
+#include "gnunet_mesh_service.h"
+#include "gnunet_statistics_service.h"
+#include <gauger.h>
+
+
+/**
+ * How namy messages to send
+ */
+#define TOTAL_PACKETS 1000
+
+/**
+ * How namy peers to run
+ */
+#define TOTAL_PEERS 1000
+
+/**
+ * How long until we give up on connecting the peers?
+ */
+#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 120)
+
+/**
+ * Time to wait for stuff that should be rather fast
+ */
+#define SHORT_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
+
+
+/**
+ * How many events have happened
+ */
+static int ok;
+
+/**
+ * Number of events expected to conclude the test successfully.
+ */
+int ok_goal;
+
+/**
+ * Size of each test packet
+ */
+size_t size_payload = sizeof (struct GNUNET_MessageHeader) + sizeof (uint32_t);
+
+/**
+ * Operation to get peer ids.
+ */
+struct GNUNET_TESTBED_Operation *t_op[TOTAL_PEERS];
+
+/**
+ * Peer ids.
+ */
+struct GNUNET_PeerIdentity *p_id[TOTAL_PEERS];
+
+/**
+ * Mesh handle for the root peer
+ */
+static struct GNUNET_MESH_Handle *mesh_h[TOTAL_PEERS];
+
+/**
+ * Channel handle for the root peer
+ */
+static struct GNUNET_MESH_Channel *ch;
+
+/**
+ * Channel handle for the dest peer
+ */
+static struct GNUNET_MESH_Channel *incoming_ch;
+
+/**
+ * Peer ids counter.
+ */
+unsigned int p_ids;
+
+/**
+ * Is the setup initialized?
+ */
+static int initialized;
+
+/**
+ * Number of payload packes sent
+ */
+static int data_sent;
+
+/**
+ * Number of payload packets received
+ */
+static int data_received;
+
+/**
+ * Number of payload packed explicitly (app level) acknowledged
+ */
+static int data_ack;
+
+/**
+ * Total number of currently running peers.
+ */
+static unsigned long long peers_running;
+
+/**
+ * Test context (to shut down).
+ */
+struct GNUNET_MESH_TEST_Context *test_ctx;
+
+/**
+ * Task called to shutdown test.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier shutdown_handle;
+
+/**
+ * Task called to disconnect peers, before shutdown.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier disconnect_task;
+
+/**
+ * Task to perform tests
+ */
+static GNUNET_SCHEDULER_TaskIdentifier test_task;
+
+/**
+ * Time we started the data transmission (after channel has been established
+ * and initilized).
+ */
+static struct GNUNET_TIME_Absolute start_time;
+
+static struct GNUNET_TESTBED_Peer **testbed_peers;
+
+/**
+ *
+ */
+static struct GNUNET_STATISTICS_Handle *stats;
+static struct GNUNET_STATISTICS_GetHandle *stats_get;
+static struct GNUNET_TESTBED_Operation *stats_op;
+static unsigned int ka_sent;
+static unsigned int ka_received;
+
+
+/**
+ * Show the results of the test (banwidth acheived) and log them to GAUGER
+ */
+static void
+show_end_data (void)
+{
+  static struct GNUNET_TIME_Absolute end_time;
+  static struct GNUNET_TIME_Relative total_time;
+
+  end_time = GNUNET_TIME_absolute_get();
+  total_time = GNUNET_TIME_absolute_get_difference(start_time, end_time);
+  FPRINTF (stderr, "\nResults of test \"%s\"\n", test_name);
+  FPRINTF (stderr, "Test time %s\n",
+           GNUNET_STRINGS_relative_time_to_string (total_time,
+                                                   GNUNET_YES));
+  FPRINTF (stderr, "Test bandwidth: %f kb/s\n",
+           4 * TOTAL_PACKETS * 1.0 / (total_time.rel_value_us / 1000)); // 4bytes * ms
+  FPRINTF (stderr, "Test throughput: %f packets/s\n\n",
+           TOTAL_PACKETS * 1000.0 / (total_time.rel_value_us / 1000)); // packets * ms
+  GAUGER ("MESH", test_name,
+          TOTAL_PACKETS * 1000.0 / (total_time.rel_value_us / 1000),
+          "packets/s");
+}
+
+
+/**
+ * Shut down peergroup, clean up.
+ *
+ * @param cls Closure (unused).
+ * @param tc Task Context.
+ */
+static void
+shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Ending test.\n");
+  shutdown_handle = GNUNET_SCHEDULER_NO_TASK;
+}
+
+
+/**
+ * Disconnect from mesh services af all peers, call shutdown.
+ *
+ * @param cls Closure (unused).
+ * @param tc Task Context.
+ */
+static void
+disconnect_mesh_peers (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  long line = (long) cls;
+  unsigned int i;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "disconnecting mesh service of peers, called from line %ld\n",
+              line);
+  disconnect_task = GNUNET_SCHEDULER_NO_TASK;
+  for (i = 0; i < 2; i++)
+  {
+    GNUNET_TESTBED_operation_done (t_op[i]);
+  }
+  if (NULL != ch)
+  {
+    GNUNET_MESH_channel_destroy (ch);
+    ch = NULL;
+  }
+  if (NULL != incoming_ch)
+  {
+    GNUNET_MESH_channel_destroy (incoming_ch);
+    incoming_ch = NULL;
+  }
+  GNUNET_MESH_TEST_cleanup (test_ctx);
+  if (GNUNET_SCHEDULER_NO_TASK != shutdown_handle)
+  {
+    GNUNET_SCHEDULER_cancel (shutdown_handle);
+  }
+  if (NULL != stats_get)
+    GNUNET_STATISTICS_get_cancel (stats_get);
+  shutdown_handle = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
+}
+
+
+/**
+ * Abort test: schedule disconnect and shutdown immediately
+ *
+ * @param line Line in the code the abort is requested from (__LINE__).
+ */
+static void
+abort_test (long line)
+{
+  if (disconnect_task != GNUNET_SCHEDULER_NO_TASK)
+  {
+    GNUNET_SCHEDULER_cancel (disconnect_task);
+    disconnect_task = GNUNET_SCHEDULER_add_now (&disconnect_mesh_peers,
+                                                (void *) line);
+  }
+}
+
+/**
+ * Transmit ready callback.
+ *
+ * @param cls Closure (message type).
+ * @param size Size of the tranmist buffer.
+ * @param buf Pointer to the beginning of the buffer.
+ *
+ * @return Number of bytes written to buf.
+ */
+static size_t
+tmt_rdy (void *cls, size_t size, void *buf);
+
+
+/**
+ * Task to schedule a new data transmission.
+ *
+ * @param cls Closure (peer #).
+ * @param tc Task Context.
+ */
+static void
+data_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct GNUNET_MESH_TransmitHandle *th;
+  struct GNUNET_MESH_Channel *channel;
+
+  if ((GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason) != 0)
+    return;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Data task\n");
+  if (GNUNET_YES == test_backwards)
+  {
+    channel = incoming_ch;
+  }
+  else
+  {
+    channel = ch;
+  }
+  th = GNUNET_MESH_notify_transmit_ready (channel, GNUNET_NO,
+                                          GNUNET_TIME_UNIT_FOREVER_REL,
+                                          size_payload, &tmt_rdy, (void *) 1L);
+  if (NULL == th)
+  {
+    unsigned long i = (unsigned long) cls;
+
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Retransmission\n");
+    if (0 == i)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_INFO, "  in 1 ms\n");
+      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MILLISECONDS,
+                                    &data_task, (void *)1UL);
+    }
+    else
+    {
+      i++;
+      GNUNET_log (GNUNET_ERROR_TYPE_INFO, "in %u ms\n", i);
+      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(
+                                      GNUNET_TIME_UNIT_MILLISECONDS,
+                                      i),
+                                    &data_task, (void *)i);
+    }
+  }
+}
+
+
+/**
+ * Transmit ready callback
+ *
+ * @param cls Closure (message type).
+ * @param size Size of the buffer we have.
+ * @param buf Buffer to copy data to.
+ */
+size_t
+tmt_rdy (void *cls, size_t size, void *buf)
+{
+  struct GNUNET_MessageHeader *msg = buf;
+  uint32_t *data;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "tmt_rdy called, filling buffer\n");
+  if (size < size_payload || NULL == buf)
+  {
+    GNUNET_break (ok >= ok_goal - 2);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "size %u, buf %p, data_sent %u, data_received %u\n",
+                size, buf, data_sent, data_received);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ok %u, ok goal %u\n", ok, ok_goal);
+
+    return 0;
+  }
+  msg->size = htons (size);
+  msg->type = htons ((long) cls);
+  data = (uint32_t *) &msg[1];
+  *data = htonl (data_sent);
+  if (GNUNET_NO == initialized)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "sending initializer\n");
+  }
+  else if (SPEED == test)
+  {
+    data_sent++;
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              " Sent packet %d\n", data_sent);
+    if (data_sent < TOTAL_PACKETS)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              " Scheduling packet %d\n", data_sent + 1);
+      GNUNET_SCHEDULER_add_now (&data_task, NULL);
+    }
+  }
+
+  return size_payload;
+}
+
+
+/**
+ * Function is called whenever a message is received.
+ *
+ * @param cls closure (set from GNUNET_MESH_connect)
+ * @param channel connection to the other end
+ * @param channel_ctx place to store local state associated with the channel
+ * @param message the actual message
+ * @return GNUNET_OK to keep the connection open,
+ *         GNUNET_SYSERR to close it (signal serious error)
+ */
+int
+data_callback (void *cls, struct GNUNET_MESH_Channel *channel,
+               void **channel_ctx,
+               const struct GNUNET_MessageHeader *message)
+{
+  long client = (long) cls;
+  long expected_target_client;
+  uint32_t *data;
+
+  ok++;
+
+  GNUNET_MESH_receive_done (channel);
+
+  if ((ok % 20) == 0)
+  {
+    if (GNUNET_SCHEDULER_NO_TASK != disconnect_task)
+    {
+      GNUNET_SCHEDULER_cancel (disconnect_task);
+      disconnect_task = GNUNET_SCHEDULER_add_delayed (SHORT_TIME,
+                                                      &disconnect_mesh_peers,
+                                                      (void *) __LINE__);
+    }
+  }
+
+  switch (client)
+  {
+  case 0L:
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Root client got a message!\n");
+    break;
+  case 4L:
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                "Leaf client %li got a message.\n",
+                client);
+    break;
+  default:
+    GNUNET_assert (0);
+    break;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, " ok: (%d/%d)\n", ok, ok_goal);
+  data = (uint32_t *) &message[1];
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, " payload: (%u)\n", ntohl (*data));
+  if (SPEED == test && GNUNET_YES == test_backwards)
+  {
+    expected_target_client = 0L;
+  }
+  else
+  {
+    expected_target_client = 4L;
+  }
+
+  if (GNUNET_NO == initialized)
+  {
+    initialized = GNUNET_YES;
+    start_time = GNUNET_TIME_absolute_get ();
+    if (SPEED == test)
+    {
+      GNUNET_assert (4L == client);
+      GNUNET_SCHEDULER_add_now (&data_task, NULL);
+      return GNUNET_OK;
+    }
+  }
+
+  if (client == expected_target_client) // Normally 4
+  {
+    data_received++;
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO, " received data %u\n", data_received);
+    if (SPEED != test || (ok_goal - 2) == ok)
+    {
+      GNUNET_MESH_notify_transmit_ready (channel, GNUNET_NO,
+                                         GNUNET_TIME_UNIT_FOREVER_REL,
+                                         size_payload, &tmt_rdy, (void *) 1L);
+      return GNUNET_OK;
+    }
+    else
+    {
+      if (data_received < TOTAL_PACKETS)
+        return GNUNET_OK;
+    }
+  }
+  else // Normally 0
+  {
+    if (test == SPEED_ACK || test == SPEED)
+    {
+      data_ack++;
+      GNUNET_log (GNUNET_ERROR_TYPE_INFO, " received ack %u\n", data_ack);
+      GNUNET_MESH_notify_transmit_ready (channel, GNUNET_NO,
+                                         GNUNET_TIME_UNIT_FOREVER_REL,
+                                         size_payload, &tmt_rdy, (void *) 1L);
+      if (data_ack < TOTAL_PACKETS && SPEED != test)
+        return GNUNET_OK;
+      if (ok == 2 && SPEED == test)
+        return GNUNET_OK;
+      show_end_data();
+    }
+    if (test == P2P_SIGNAL)
+    {
+      GNUNET_MESH_channel_destroy (incoming_ch);
+      incoming_ch = NULL;
+    }
+    else
+    {
+      GNUNET_MESH_channel_destroy (ch);
+      ch = NULL;
+    }
+  }
+
+  if (GNUNET_SCHEDULER_NO_TASK != disconnect_task)
+  {
+    GNUNET_SCHEDULER_cancel (disconnect_task);
+    disconnect_task = GNUNET_SCHEDULER_add_delayed (SHORT_TIME,
+                                                    &disconnect_mesh_peers,
+                                                    (void *) __LINE__);
+  }
+
+  return GNUNET_OK;
+}
+
+
+/**
+ * Adapter function called to establish a connection to the statistics service.
+ *
+ * @param cls closure
+ * @param cfg configuration of the peer to connect to; will be available until
+ *          GNUNET_TESTBED_operation_done() is called on the operation returned
+ *          from GNUNET_TESTBED_service_connect()
+ * @return service handle to return in 'op_result', NULL on error
+ */
+static void *
+stats_ca (void *cls, const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  return GNUNET_STATISTICS_create ("<test_mesh>", cfg);
+}
+
+
+/**
+ * Adapter function called to destroy a connection to
+ * statistics service.
+ *
+ * @param cls Closure (unused).
+ * @param op_result service handle returned from the connect adapter
+ */
+static void
+stats_da (void *cls, void *op_result)
+{
+  GNUNET_assert (op_result == stats);
+  GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+  stats = NULL;
+}
+
+
+/**
+ * Function called by testbed once we are connected to stats
+ * service. Get the statistics of interest.
+ *
+ * @param cls Closure (unused).
+ * @param op connect operation handle
+ * @param ca_result handle to stats service
+ * @param emsg error message on failure
+ */
+static void
+stats_connect_cb (void *cls,
+                  struct GNUNET_TESTBED_Operation *op,
+                  void *ca_result,
+                  const char *emsg);
+
+/**
+ * Stats callback. Finish the stats testbed operation and when all stats have
+ * been iterated, shutdown the test.
+ *
+ * @param cls closure
+ * @param success GNUNET_OK if statistics were
+ *        successfully obtained, GNUNET_SYSERR if not.
+ */
+static void
+stats_cont (void *cls, int success)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "stats_cont for peer %u\n", cls);
+  GNUNET_TESTBED_operation_done (stats_op);
+  stats_get = NULL;
+  if (NULL == cls)
+  {
+    stats_op = GNUNET_TESTBED_service_connect (NULL,
+                                               testbed_peers[4],
+                                               "statistics",
+                                               &stats_connect_cb,
+                                               (void *)4,
+                                               &stats_ca,
+                                               &stats_da,
+                                               (void *)4);
+  }
+  else
+  {
+    if (GNUNET_SCHEDULER_NO_TASK != disconnect_task)
+      GNUNET_SCHEDULER_cancel (disconnect_task);
+    disconnect_task = GNUNET_SCHEDULER_add_now (&disconnect_mesh_peers,
+                                                (void *) __LINE__);
+  }
+}
+
+
+/**
+ * Process statistic values.
+ *
+ * @param cls closure
+ * @param subsystem name of subsystem that created the statistic
+ * @param name the name of the datum
+ * @param value the current value
+ * @param is_persistent GNUNET_YES if the value is persistent, GNUNET_NO if not
+ * @return GNUNET_OK to continue, GNUNET_SYSERR to abort iteration
+ */
+static int
+stats_iterator (void *cls, const char *subsystem, const char *name,
+                uint64_t value, int is_persistent)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "  %u - %s [%s]: %llu\n",
+              cls, subsystem, name, value);
+  if (0 == strncmp("# keepalives sent", name,
+                   strlen("# keepalives sent"))
+      && 0 == (long) cls)
+    ka_sent = value;
+
+  if (0 == strncmp("# keepalives received", name,
+                   strlen ("# keepalives received"))
+      && 4 == (long) cls)
+  {
+    ka_received = value;
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO, " sent: %u, received: %u\n",
+                ka_sent, ka_received);
+    if (ka_sent < 2 || ka_sent > ka_received + 1)
+      ok--;
+  }
+
+  return GNUNET_OK;
+}
+
+
+/**
+ * Function called by testbed once we are connected to stats
+ * service. Get the statistics of interest.
+ *
+ * @param cls Closure (unused).
+ * @param op connect operation handle
+ * @param ca_result handle to stats service
+ * @param emsg error message on failure
+ */
+static void
+stats_connect_cb (void *cls,
+                  struct GNUNET_TESTBED_Operation *op,
+                  void *ca_result,
+                  const char *emsg)
+{
+  if (NULL == ca_result || NULL != emsg)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Failed to connect to statistics service: %s\n", emsg);
+    return;
+  }
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "stats for peer %u\n", cls);
+  stats = ca_result;
+
+  stats_get = GNUNET_STATISTICS_get (stats, "mesh", NULL,
+                                     GNUNET_TIME_UNIT_FOREVER_REL,
+                                     &stats_cont, &stats_iterator, cls);
+  if (NULL == stats_get)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not get statistics of peer %u!\n", cls);
+  }
+}
+
+
+/**
+ * Task check that keepalives were sent and received.
+ *
+ * @param cls Closure (NULL).
+ * @param tc Task Context.
+ */
+static void
+check_keepalives (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  if ((GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason) != 0)
+    return;
+
+  disconnect_task = GNUNET_SCHEDULER_NO_TASK;
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "check keepalives\n");
+  GNUNET_MESH_channel_destroy (ch);
+  stats_op = GNUNET_TESTBED_service_connect (NULL,
+                                             testbed_peers[0],
+                                             "statistics",
+                                             &stats_connect_cb,
+                                             NULL,
+                                             &stats_ca,
+                                             &stats_da,
+                                             NULL);
+}
+
+
+/**
+ * Handlers, for diverse services
+ */
+static struct GNUNET_MESH_MessageHandler handlers[] = {
+  {&data_callback, 1, sizeof (struct GNUNET_MessageHeader)},
+  {NULL, 0, 0}
+};
+
+
+/**
+ * Method called whenever another peer has added us to a channel
+ * the other peer initiated.
+ *
+ * @param cls Closure.
+ * @param channel New handle to the channel.
+ * @param initiator Peer that started the channel.
+ * @param port Port this channel is connected to.
+ * @param options channel option flags
+ * @return Initial channel context for the channel
+ *         (can be NULL -- that's not an error).
+ */
+static void *
+incoming_channel (void *cls, struct GNUNET_MESH_Channel *channel,
+                 const struct GNUNET_PeerIdentity *initiator,
+                 uint32_t port, enum GNUNET_MESH_ChannelOption options)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+              "Incoming channel from %s to peer %d\n",
+              GNUNET_i2s (initiator), (long) cls);
+  ok++;
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, " ok: %d\n", ok);
+  if ((long) cls == 4L)
+    incoming_ch = channel;
+  else
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                "Incoming channel for unknown client %lu\n", (long) cls);
+    GNUNET_break(0);
+  }
+  if (GNUNET_SCHEDULER_NO_TASK != disconnect_task)
+  {
+    GNUNET_SCHEDULER_cancel (disconnect_task);
+    if (KEEPALIVE == test)
+    {
+      struct GNUNET_TIME_Relative delay;
+      delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS , 5);
+      disconnect_task =
+        GNUNET_SCHEDULER_add_delayed (delay, &check_keepalives, NULL);
+    }
+    else
+      disconnect_task = GNUNET_SCHEDULER_add_delayed (SHORT_TIME,
+                                                      &disconnect_mesh_peers,
+                                                      (void *) __LINE__);
+  }
+
+  return NULL;
+}
+
+/**
+ * Function called whenever an inbound channel is destroyed.  Should clean up
+ * any associated state.
+ *
+ * @param cls closure (set from GNUNET_MESH_connect)
+ * @param channel connection to the other end (henceforth invalid)
+ * @param channel_ctx place where local state associated
+ *                   with the channel is stored
+ */
+static void
+channel_cleaner (void *cls, const struct GNUNET_MESH_Channel *channel,
+                 void *channel_ctx)
+{
+  long i = (long) cls;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+              "Incoming channel disconnected at peer %d\n",
+              i);
+  if (4L == i)
+  {
+    ok++;
+    GNUNET_break (channel == incoming_ch);
+    incoming_ch = NULL;
+  }
+  else if (0L == i)
+  {
+    if (P2P_SIGNAL == test)
+    {
+      ok ++;
+    }
+    GNUNET_break (channel == ch);
+    ch = NULL;
+  }
+  else
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                "Unknown peer! %d\n", i);
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, " ok: %d\n", ok);
+
+  if (GNUNET_SCHEDULER_NO_TASK != disconnect_task)
+  {
+    GNUNET_SCHEDULER_cancel (disconnect_task);
+    disconnect_task = GNUNET_SCHEDULER_add_now (&disconnect_mesh_peers,
+                                                (void *) __LINE__);
+  }
+
+  return;
+}
+
+
+/**
+ * START THE TESTCASE ITSELF, AS WE ARE CONNECTED TO THE MESH SERVICES.
+ *
+ * Testcase continues when the root receives confirmation of connected peers,
+ * on callback funtion ch.
+ *
+ * @param cls Closure (unsued).
+ * @param tc Task Context.
+ */
+static void
+do_test (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  enum GNUNET_MESH_ChannelOption flags;
+
+  if ((GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason) != 0)
+    return;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "test_task\n");
+
+  if (GNUNET_SCHEDULER_NO_TASK != disconnect_task)
+  {
+    GNUNET_SCHEDULER_cancel (disconnect_task);
+  }
+
+  flags = GNUNET_MESH_OPTION_DEFAULT;
+  if (SPEED_REL == test)
+  {
+    test = SPEED;
+    flags |= GNUNET_MESH_OPTION_RELIABLE;
+  }
+  ch = GNUNET_MESH_channel_create (h1, NULL, p_id[1], 1, flags);
+
+  disconnect_task = GNUNET_SCHEDULER_add_delayed (SHORT_TIME,
+                                                  &disconnect_mesh_peers,
+                                                  (void *) __LINE__);
+  if (KEEPALIVE == test)
+    return; /* Don't send any data. */
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Sending data initializer...\n");
+  data_ack = 0;
+  data_received = 0;
+  data_sent = 0;
+  GNUNET_MESH_notify_transmit_ready (ch, GNUNET_NO,
+                                     GNUNET_TIME_UNIT_FOREVER_REL,
+                                     size_payload, &tmt_rdy, (void *) 1L);
+}
+
+/**
+ * Callback to be called when the requested peer information is available
+ *
+ * @param cls the closure from GNUNET_TESTBED_peer_get_information()
+ * @param op the operation this callback corresponds to
+ * @param pinfo the result; will be NULL if the operation has failed
+ * @param emsg error message if the operation has failed;
+ *             NULL if the operation is successfull
+ */
+static void
+pi_cb (void *cls,
+       struct GNUNET_TESTBED_Operation *op,
+       const struct GNUNET_TESTBED_PeerInformation *pinfo,
+       const char *emsg)
+{
+  long i = (long) cls;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "id callback for %ld\n", i);
+
+  if (NULL == pinfo || NULL != emsg)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "pi_cb: %s\n", emsg);
+    abort_test (__LINE__);
+    return;
+  }
+  p_id[i] = pinfo->result.id;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "  id: %s\n", GNUNET_i2s (p_id[i]));
+  p_ids++;
+  if (p_ids < 2)
+    return;
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got all IDs, starting test\n");
+  test_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
+                                            &do_test, NULL);
+}
+
+/**
+ * test main: start test when all peers are connected
+ *
+ * @param cls Closure.
+ * @param ctx Argument to give to GNUNET_MESH_TEST_cleanup on test end.
+ * @param num_peers Number of peers that are running.
+ * @param peers Array of peers.
+ * @param meshes Handle to each of the MESHs of the peers.
+ */
+static void
+tmain (void *cls,
+       struct GNUNET_MESH_TEST_Context *ctx,
+       unsigned int num_peers,
+       struct GNUNET_TESTBED_Peer **peers,
+       struct GNUNET_MESH_Handle **meshes)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "test main\n");
+  ok = 0;
+  test_ctx = ctx;
+  peers_running = num_peers;
+  testbed_peers = peers;
+  h1 = meshes[0];
+  h2 = meshes[num_peers - 1];
+  disconnect_task = GNUNET_SCHEDULER_add_delayed (SHORT_TIME,
+                                                  &disconnect_mesh_peers,
+                                                  (void *) __LINE__);
+  shutdown_handle = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
+                                                  &shutdown_task, NULL);
+  t_op[0] = GNUNET_TESTBED_peer_get_information (peers[0],
+                                                 GNUNET_TESTBED_PIT_IDENTITY,
+                                                 &pi_cb, (void *) 0L);
+  t_op[1] = GNUNET_TESTBED_peer_get_information (peers[num_peers - 1],
+                                                 GNUNET_TESTBED_PIT_IDENTITY,
+                                                 &pi_cb, (void *) 1L);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "requested peer ids\n");
+}
+
+
+/**
+ * Main: start test
+ */
+int
+main (int argc, char *argv[])
+{
+  initialized = GNUNET_NO;
+  uint32_t ports[2];
+  const char *config_file;
+
+  GNUNET_log_setup ("test", "DEBUG", NULL);
+  config_file = "test_mesh.conf";
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Start\n");
+  if (strstr (argv[0], "_small_forward") != NULL)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "FORWARD\n");
+    test = FORWARD;
+    test_name = "unicast";
+    ok_goal = 4;
+  }
+  else if (strstr (argv[0], "_small_signal") != NULL)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "SIGNAL\n");
+    test = P2P_SIGNAL;
+    test_name = "signal";
+    ok_goal = 4;
+  }
+  else if (strstr (argv[0], "_small_speed_ack") != NULL)
+  {
+    /* Test is supposed to generate the following callbacks:
+     * 1 incoming channel (@dest)
+     * TOTAL_PACKETS received data packet (@dest)
+     * TOTAL_PACKETS received data packet (@orig)
+     * 1 received channel destroy (@dest)
+     */
+    ok_goal = TOTAL_PACKETS * 2 + 2;
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "SPEED_ACK\n");
+    test = SPEED_ACK;
+    test_name = "speed ack";
+  }
+  else if (strstr (argv[0], "_small_speed") != NULL)
+  {
+    /* Test is supposed to generate the following callbacks:
+     * 1 incoming channel (@dest)
+     * 1 initial packet (@dest)
+     * TOTAL_PACKETS received data packet (@dest)
+     * 1 received data packet (@orig)
+     * 1 received channel destroy (@dest)
+     */
+    ok_goal = TOTAL_PACKETS + 4;
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "SPEED\n");
+    if (strstr (argv[0], "_reliable") != NULL)
+    {
+      test = SPEED_REL;
+      test_name = "speed reliable";
+      config_file = "test_mesh_drop.conf";
+    }
+    else
+    {
+      test = SPEED;
+      test_name = "speed";
+    }
+  }
+  else if (strstr (argv[0], "_keepalive") != NULL)
+  {
+    test = KEEPALIVE;
+    /* Test is supposed to generate the following callbacks:
+     * 1 incoming channel (@dest)
+     * [wait]
+     * 1 received channel destroy (@dest)
+     */
+    ok_goal = 2;
+  }
+  else
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "UNKNOWN\n");
+    test = SETUP;
+    ok_goal = 0;
+  }
+
+  if (strstr (argv[0], "backwards") != NULL)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "BACKWARDS (LEAF TO ROOT)\n");
+    test_backwards = GNUNET_YES;
+    GNUNET_asprintf (&test_name, "backwards %s", test_name);
+  }
+
+  p_ids = 0;
+  ports[0] = 1;
+  ports[1] = 0;
+  GNUNET_MESH_TEST_run ("test_mesh_small",
+                        config_file,
+                        5,
+                        &tmain,
+                        NULL, /* tmain cls */
+                        &incoming_channel,
+                        &channel_cleaner,
+                        handlers,
+                        ports);
+
+  if (ok_goal > ok)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "FAILED! (%d/%d)\n", ok, ok_goal);
+    return 1;
+  }
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "success\n");
+  return 0;
+}
+
+/* end of test_mesh_small.c */
+