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[gnunet] branch master updated: - added rudimentary cmd helper (copied f


From: gnunet
Subject: [gnunet] branch master updated: - added rudimentary cmd helper (copied from testbed-helper), binary to start a testcase plugin, rudimentary testcase plugin
Date: Wed, 07 Jul 2021 10:44:32 +0200

This is an automated email from the git hooks/post-receive script.

t3sserakt pushed a commit to branch master
in repository gnunet.

The following commit(s) were added to refs/heads/master by this push:
     new 48cc7d6cb - added rudimentary cmd helper (copied from testbed-helper), 
binary to start a testcase plugin, rudimentary testcase plugin
     new 097d7e3c2 Merge branch 'master' of ssh://gnunet.org/gnunet
48cc7d6cb is described below

commit 48cc7d6cbc9552794e846200deaf679714ffa4eb
Author: t3sserakt <t3ss@posteo.de>
AuthorDate: Wed Jul 7 10:40:07 2021 +0200

    - added rudimentary cmd helper (copied from testbed-helper), binary to 
start a testcase plugin, rudimentary testcase plugin
---
 src/include/gnunet_testing_plugin.h                |  60 +++
 src/testbed/Makefile.am                            |  32 ++
 src/testbed/gnunet-cmd.c                           |  93 ++++
 src/testbed/gnunet-helper-cmds.c                   | 581 +++++++++++++++++++++
 src/testbed/plugin_testcmd.c                       |  87 +++
 src/testbed/testbed_api.h                          |   5 +
 .../testbed_api_cmd_netjail_start_testbed.c        |   7 +-
 src/testing/testing_api_loop.c                     |  47 +-
 8 files changed, 899 insertions(+), 13 deletions(-)

diff --git a/src/include/gnunet_testing_plugin.h 
b/src/include/gnunet_testing_plugin.h
new file mode 100644
index 000000000..527f509ad
--- /dev/null
+++ b/src/include/gnunet_testing_plugin.h
@@ -0,0 +1,60 @@
+/*
+      This file is part of GNUnet
+      Copyright (C) 2021 GNUnet e.V.
+
+      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
+      Affero General Public License for more details.
+
+      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
+ */
+
+/**
+ *
+ * @author t3sserakt
+ *
+ * Plugin API to start test cases.
+ *
+ */
+#ifndef GNUNET_TESTING_PLUGIN_H
+#define GNUNET_TESTING_PLUGIN_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0                           /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+
+typedef void
+(*GNUNET_TESTING_PLUGIN_StartTestCase) ();
+
+struct GNUNET_TESTING_PluginFunctions
+{
+  /**
+   * Closure for all of the callbacks.
+   */
+  void *cls;
+
+  GNUNET_TESTING_PLUGIN_StartTestCase start_testcase;
+};
+
+#if 0                           /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/testbed/Makefile.am b/src/testbed/Makefile.am
index 79989bae7..8c4a6342b 100644
--- a/src/testbed/Makefile.am
+++ b/src/testbed/Makefile.am
@@ -6,6 +6,8 @@ if USE_COVERAGE
   XLIB = -lgcov
 endif
 
+plugindir = $(libdir)/gnunet
+
 libexecdir= $(pkglibdir)/libexec/
 
 pkgcfgdir= $(pkgdatadir)/config.d/
@@ -21,6 +23,8 @@ if HAVE_SQLITE
 endif
 
 libexec_PROGRAMS = \
+  gnunet-cmd \
+  gnunet-helper-cmds \
   gnunet-service-testbed \
   gnunet-helper-testbed \
   gnunet-daemon-testbed-blacklist \
@@ -33,6 +37,18 @@ bin_PROGRAMS = \
 noinst_PROGRAMS = \
   $(generate_underlay)
 
+plugin_LTLIBRARIES = \
+  libgnunet_plugin_testcmd.la
+
+libgnunet_plugin_testcmd_la_SOURCES = \
+  plugin_testcmd.c
+libgnunet_plugin_testcmd_la_LIBADD = \
+  $(top_builddir)/src/util/libgnunetutil.la \
+  $(top_builddir)/src/testing/libgnunettesting.la \
+  $(LTLIBINTL)
+libgnunet_plugin_testcmd_la_LDFLAGS = \
+ $(GN_PLUGIN_LDFLAGS)
+
 gnunet_service_testbed_SOURCES = \
   gnunet-service-testbed.c gnunet-service-testbed.h \
   gnunet-service-testbed_links.c gnunet-service-testbed_links.h \
@@ -70,6 +86,22 @@ gnunet_helper_testbed_LDADD = $(XLIB) \
  libgnunettestbed.la \
  $(LTLIBINTL) $(Z_LIBS)
 
+gnunet_cmd_SOURCES = \
+  gnunet-cmd.c
+gnunet_cmd_LDADD = $(XLIB) \
+ $(top_builddir)/src/util/libgnunetutil.la \
+ $(top_builddir)/src/testing/libgnunettesting.la \
+ libgnunettestbed.la \
+ $(LTLIBINTL) $(Z_LIBS)
+
+gnunet_helper_cmds_SOURCES = \
+  gnunet-helper-cmds.c
+gnunet_helper_cmds_LDADD = $(XLIB) \
+ $(top_builddir)/src/util/libgnunetutil.la \
+ $(top_builddir)/src/testing/libgnunettesting.la \
+ libgnunettestbed.la \
+ $(LTLIBINTL) $(Z_LIBS)
+
 gnunet_daemon_testbed_blacklist_SOURCES = gnunet-daemon-testbed-blacklist.c
 gnunet_daemon_testbed_blacklist_LDADD = $(XLIB) \
  $(top_builddir)/src/transport/libgnunettransport.la \
diff --git a/src/testbed/gnunet-cmd.c b/src/testbed/gnunet-cmd.c
new file mode 100644
index 000000000..477c3c454
--- /dev/null
+++ b/src/testbed/gnunet-cmd.c
@@ -0,0 +1,93 @@
+/*
+      This file is part of GNUnet
+      Copyright (C) 2008--2013, 2016 GNUnet e.V.
+
+      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
+      Affero General Public License for more details.
+
+      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
+ */
+
+/**
+ * @file testbed/gnunet-cmd.c
+ *
+ * @brief Binary to start testcase plugins
+ *
+ * @author t3sserakt
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_testing_lib.h"
+#include "gnunet_testing_plugin.h"
+
+/**
+ * Generic logging shortcut
+ */
+#define LOG(kind, ...) GNUNET_log (kind, __VA_ARGS__)
+
+
+/**
+ * Handle for a plugin.
+ */
+struct Plugin
+{
+  /**
+   * Name of the shared library.
+   */
+  char *library_name;
+
+  /**
+   * Plugin API.
+   */
+  struct GNUNET_TESTING_PluginFunctions *api;
+};
+
+
+/**
+ * Main function to run the test cases.
+ *
+ * @param cls not used.
+ *
+ */
+static void
+run (void *cls)
+{
+  struct Plugin *plugin;
+
+  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "gnunet-cmd",
+                   "running plugin.\n");
+  LOG (GNUNET_ERROR_TYPE_ERROR,
+       "running plugin.\n");
+  plugin = GNUNET_new (struct Plugin);
+  plugin->api = GNUNET_PLUGIN_load ("libgnunet_plugin_testcmd",
+                                    NULL);
+  plugin->library_name = GNUNET_strdup ("libgnunet_plugin_testcmd");
+  plugin->api->start_testcase ();
+}
+
+
+int
+main (int argc, char *const *argv)
+{
+  int rv = 0;
+
+  GNUNET_log_setup ("gnunet-cmd",
+                    "DEBUG",
+                    NULL);
+
+  GNUNET_SCHEDULER_run (&run,
+                        NULL);
+
+  return rv;
+}
diff --git a/src/testbed/gnunet-helper-cmds.c b/src/testbed/gnunet-helper-cmds.c
new file mode 100644
index 000000000..3073ebdfb
--- /dev/null
+++ b/src/testbed/gnunet-helper-cmds.c
@@ -0,0 +1,581 @@
+/*
+      This file is part of GNUnet
+      Copyright (C) 2008--2013, 2016 GNUnet e.V.
+
+      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
+      Affero General Public License for more details.
+
+      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
+ */
+
+/**
+ * @file testbed/gnunet-helper-cmds.c
+ * @brief Helper binary that is started from a remote interpreter loop to start
+ *        a local interpreter loop.
+ *
+ *        This helper monitors for three termination events.  They are: (1)The
+ *        stdin of the helper is closed for reading; (2)the helper received
+ *        SIGTERM/SIGINT; (3)the local loop crashed.  In case of events 1 and 2
+ *        the helper kills the interpreter loop.  When the interpreter loop
+ *        crashed (event 3), the helper should send a SIGTERM to its own 
process
+ *        group; this behaviour will help terminate any child processes the 
loop
+ *        has started and prevents them from leaking and running forever.
+ *
+ * @author t3sserakt
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ */
+
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_testing_lib.h"
+#include "gnunet_testbed_service.h"
+#include "testbed_helper.h"
+#include "testbed_api.h"
+#include <zlib.h>
+
+/**
+ * Generic logging shortcut
+ */
+#define LOG(kind, ...) GNUNET_log (kind, __VA_ARGS__)
+
+/**
+ * Debug logging shorthand
+ */
+#define LOG_DEBUG(...) LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
+
+
+/**
+ * Context for a single write on a chunk of memory
+ */
+struct WriteContext
+{
+  /**
+   * The data to write
+   */
+  void *data;
+
+  /**
+   * The length of the data
+   */
+  size_t length;
+
+  /**
+   * The current position from where the write operation should begin
+   */
+  size_t pos;
+};
+
+/**
+ * The process handle to the testbed service
+ */
+static struct GNUNET_OS_Process *cmd_binary_process;
+
+/**
+ * Handle to the testing system
+ */
+static struct GNUNET_TESTING_System *test_system;
+
+/**
+ * Our message stream tokenizer
+ */
+struct GNUNET_MessageStreamTokenizer *tokenizer;
+
+/**
+ * Disk handle from stdin
+ */
+static struct GNUNET_DISK_FileHandle *stdin_fd;
+
+/**
+ * Disk handle for stdout
+ */
+static struct GNUNET_DISK_FileHandle *stdout_fd;
+
+/**
+ * Pipe used to communicate shutdown via signal.
+ */
+static struct GNUNET_DISK_PipeHandle *sigpipe;
+
+/**
+ * Task identifier for the read task
+ */
+static struct GNUNET_SCHEDULER_Task *read_task_id;
+
+/**
+ * Task identifier for the write task
+ */
+static struct GNUNET_SCHEDULER_Task *write_task_id;
+
+/**
+ * Task to kill the child
+ */
+static struct GNUNET_SCHEDULER_Task *child_death_task_id;
+
+/**
+ * Are we done reading messages from stdin?
+ */
+static int done_reading;
+
+/**
+ * Result to return in case we fail
+ */
+static int status;
+
+
+/**
+ * Task to shut down cleanly
+ *
+ * @param cls NULL
+ */
+static void
+shutdown_task (void *cls)
+{
+  LOG_DEBUG ("Shutting down\n");
+
+  if (NULL != read_task_id)
+  {
+    GNUNET_SCHEDULER_cancel (read_task_id);
+    read_task_id = NULL;
+  }
+  if (NULL != write_task_id)
+  {
+    struct WriteContext *wc;
+
+    wc = GNUNET_SCHEDULER_cancel (write_task_id);
+    write_task_id = NULL;
+    GNUNET_free (wc->data);
+    GNUNET_free (wc);
+  }
+  if (NULL != child_death_task_id)
+  {
+    GNUNET_SCHEDULER_cancel (child_death_task_id);
+    child_death_task_id = NULL;
+  }
+  if (NULL != stdin_fd)
+    (void) GNUNET_DISK_file_close (stdin_fd);
+  if (NULL != stdout_fd)
+    (void) GNUNET_DISK_file_close (stdout_fd);
+  GNUNET_MST_destroy (tokenizer);
+  tokenizer = NULL;
+
+  if (NULL != test_system)
+  {
+    GNUNET_TESTING_system_destroy (test_system, GNUNET_YES);
+    test_system = NULL;
+  }
+}
+
+
+/**
+ * Task to write to the standard out
+ *
+ * @param cls the WriteContext
+ */
+static void
+write_task (void *cls)
+{
+  struct WriteContext *wc = cls;
+  ssize_t bytes_wrote;
+
+  GNUNET_assert (NULL != wc);
+  write_task_id = NULL;
+  bytes_wrote = GNUNET_DISK_file_write (stdout_fd,
+                                        wc->data + wc->pos,
+                                        wc->length - wc->pos);
+  if (GNUNET_SYSERR == bytes_wrote)
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING, "Cannot reply back configuration\n");
+    GNUNET_free (wc->data);
+    GNUNET_free (wc);
+    return;
+  }
+  wc->pos += bytes_wrote;
+  if (wc->pos == wc->length)
+  {
+    GNUNET_free (wc->data);
+    GNUNET_free (wc);
+    return;
+  }
+  write_task_id = GNUNET_SCHEDULER_add_write_file 
(GNUNET_TIME_UNIT_FOREVER_REL,
+                                                   stdout_fd,
+                                                   &write_task,
+                                                   wc);
+}
+
+
+/**
+ * Task triggered whenever we receive a SIGCHLD (child
+ * process died).
+ *
+ * @param cls closure, NULL if we need to self-restart
+ */
+static void
+child_death_task (void *cls)
+{
+  const struct GNUNET_DISK_FileHandle *pr;
+  char c[16];
+
+  pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
+  child_death_task_id = NULL;
+  /* consume the signal */
+  GNUNET_break (0 < GNUNET_DISK_file_read (pr, &c, sizeof(c)));
+  LOG_DEBUG ("Got SIGCHLD\n");
+
+  LOG_DEBUG ("Child hasn't died.  Resuming to monitor its status\n");
+  child_death_task_id =
+    GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+                                    pr,
+                                    &child_death_task,
+                                    NULL);
+}
+
+
+/**
+ * Functions with this signature are called whenever a
+ * complete message is received by the tokenizer.
+ *
+ * Do not call #GNUNET_mst_destroy() in this callback
+ *
+ * @param cls identification of the client
+ * @param message the actual message
+ * @return #GNUNET_OK on success,
+ *    #GNUNET_NO to stop further processing (no error)
+ *    #GNUNET_SYSERR to stop further processing with error
+ */
+static int
+tokenizer_cb (void *cls, const struct GNUNET_MessageHeader *message)
+{
+  const struct GNUNET_TESTBED_HelperInit *msg;
+  struct GNUNET_TESTBED_HelperReply *reply;
+  struct GNUNET_CONFIGURATION_Handle *cfg;
+  struct WriteContext *wc;
+  char *binary;
+  char *trusted_ip;
+  char *hostname;
+  char *config;
+  char *xconfig;
+  char *evstr;
+  // char *str;
+  size_t config_size;
+  uLongf ul_config_size;
+  size_t xconfig_size;
+  uint16_t trusted_ip_size;
+  uint16_t hostname_size;
+  uint16_t msize;
+
+  msize = ntohs (message->size);
+  if ((sizeof(struct GNUNET_TESTBED_HelperInit) >= msize) ||
+      (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_INIT != ntohs (message->type)))
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING, "Received unexpected message -- 
exiting\n");
+    goto error;
+  }
+  msg = (const struct GNUNET_TESTBED_HelperInit *) message;
+  trusted_ip_size = ntohs (msg->trusted_ip_size);
+  trusted_ip = (char *) &msg[1];
+  if ('\0' != trusted_ip[trusted_ip_size])
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING, "Trusted IP cannot be empty -- exiting\n");
+    goto error;
+  }
+  hostname_size = ntohs (msg->hostname_size);
+  if ((sizeof(struct GNUNET_TESTBED_HelperInit) + trusted_ip_size + 1
+       + hostname_size) >= msize)
+  {
+    GNUNET_break (0);
+    LOG (GNUNET_ERROR_TYPE_WARNING, "Received unexpected message -- 
exiting\n");
+    goto error;
+  }
+  ul_config_size = (uLongf) ntohs (msg->config_size);
+  config = GNUNET_malloc (ul_config_size);
+  xconfig_size = msize - (trusted_ip_size + 1 + hostname_size
+                          + sizeof(struct GNUNET_TESTBED_HelperInit));
+  int ret = uncompress ((Bytef *) config,
+                        &ul_config_size,
+                        (const Bytef *) (trusted_ip + trusted_ip_size + 1
+                                         + hostname_size),
+                        (uLongf) xconfig_size);
+  if (Z_OK != ret)
+  {
+    switch (ret)
+    {
+    case Z_MEM_ERROR:
+      LOG (GNUNET_ERROR_TYPE_ERROR, "Not enough memory for decompression\n");
+      break;
+
+    case Z_BUF_ERROR:
+      LOG (GNUNET_ERROR_TYPE_ERROR, "Output buffer too small\n");
+      break;
+
+    case Z_DATA_ERROR:
+      LOG (GNUNET_ERROR_TYPE_ERROR, "Data corrupted/incomplete\n");
+      break;
+
+    default:
+      GNUNET_break (0);
+    }
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         "Error while uncompressing config -- exiting\n");
+    GNUNET_free (config);
+    goto error;
+  }
+  cfg = GNUNET_CONFIGURATION_create ();
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_deserialize (cfg, config, ul_config_size, NULL))
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR, "Unable to deserialize config -- exiting\n");
+    GNUNET_free (config);
+    goto error;
+  }
+  GNUNET_free (config);
+  hostname = NULL;
+  if (0 != hostname_size)
+  {
+    hostname = GNUNET_malloc (hostname_size + 1);
+    GNUNET_strlcpy (hostname,
+                    ((char *) &msg[1]) + trusted_ip_size + 1,
+                    hostname_size + 1);
+  }
+  /* unset GNUNET_TESTING_PREFIX if present as it is more relevant for testbed 
*/
+  evstr = getenv (GNUNET_TESTING_PREFIX);
+  if (NULL != evstr)
+  {
+    /* unsetting the variable will invalidate the pointer! */
+    evstr = GNUNET_strdup (evstr);
+    GNUNET_break (0 == unsetenv (GNUNET_TESTING_PREFIX));
+  }
+  test_system =
+    GNUNET_TESTING_system_create ("testbed-helper", trusted_ip, hostname, 
NULL);
+  if (NULL != evstr)
+  {
+    char *evar;
+
+    GNUNET_asprintf (&evar, GNUNET_TESTING_PREFIX "=%s", evstr);
+    GNUNET_assert (0 == putenv (evar)); /* consumes 'evar',
+                                           see putenv(): becomes part of 
environment! */
+    GNUNET_free (evstr);
+    evstr = NULL;
+  }
+  GNUNET_free (hostname);
+  hostname = NULL;
+  GNUNET_assert (NULL != test_system);
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_TESTING_configuration_create (test_system, cfg));
+  GNUNET_assert (GNUNET_OK ==
+                 GNUNET_CONFIGURATION_get_value_filename (cfg,
+                                                          "PATHS",
+                                                          "DEFAULTCONFIG",
+                                                          &config));
+  if (GNUNET_OK != GNUNET_CONFIGURATION_write (cfg, config))
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING,
+         "Unable to write config file: %s -- exiting\n",
+         config);
+    GNUNET_CONFIGURATION_destroy (cfg);
+    GNUNET_free (config);
+    goto error;
+  }
+  LOG_DEBUG ("Staring testbed with config: %s\n", config);
+  binary = GNUNET_OS_get_libexec_binary_path ("gnunet-cmd");
+  {
+    char *evar;
+
+    /* expose testbed configuration through env variable */
+    GNUNET_asprintf (&evar, "%s=%s", ENV_TESTBED_CONFIG, config);
+    GNUNET_assert (0 == putenv (evar));   /* consumes 'evar',
+                                            see putenv(): becomes part of 
environment! */
+    evstr = NULL;
+  }
+
+  cmd_binary_process = GNUNET_OS_start_process (
+    GNUNET_OS_INHERIT_STD_ERR /*verbose? */,
+    NULL,
+    NULL,
+    NULL,
+    binary);
+
+  if (NULL == cmd_binary_process)
+  {
+    return GNUNET_SYSERR;
+  }
+
+  GNUNET_free (binary);
+  GNUNET_free (config);
+
+  done_reading = GNUNET_YES;
+  config = GNUNET_CONFIGURATION_serialize (cfg, &config_size);
+  GNUNET_CONFIGURATION_destroy (cfg);
+  cfg = NULL;
+  xconfig_size =
+    GNUNET_TESTBED_compress_config_ (config, config_size, &xconfig);
+  GNUNET_free (config);
+  wc = GNUNET_new (struct WriteContext);
+  wc->length = xconfig_size + sizeof(struct GNUNET_TESTBED_HelperReply);
+  reply = GNUNET_realloc (xconfig, wc->length);
+  memmove (&reply[1], reply, xconfig_size);
+  reply->header.type = htons (GNUNET_MESSAGE_TYPE_TESTBED_HELPER_REPLY);
+  reply->header.size = htons ((uint16_t) wc->length);
+  reply->config_size = htons ((uint16_t) config_size);
+  wc->data = reply;
+  write_task_id = GNUNET_SCHEDULER_add_write_file 
(GNUNET_TIME_UNIT_FOREVER_REL,
+                                                   stdout_fd,
+                                                   &write_task,
+                                                   wc);
+  child_death_task_id = GNUNET_SCHEDULER_add_read_file (
+    GNUNET_TIME_UNIT_FOREVER_REL,
+    GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ),
+    &child_death_task,
+    NULL);
+  return GNUNET_OK;
+
+  error:
+  status = GNUNET_SYSERR;
+  GNUNET_SCHEDULER_shutdown ();
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Task to read from stdin
+ *
+ * @param cls NULL
+ */
+static void
+read_task (void *cls)
+{
+  char buf[GNUNET_MAX_MESSAGE_SIZE];
+  ssize_t sread;
+
+  read_task_id = NULL;
+  sread = GNUNET_DISK_file_read (stdin_fd, buf, sizeof(buf));
+  if ((GNUNET_SYSERR == sread) || (0 == sread))
+  {
+    LOG_DEBUG ("STDIN closed\n");
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  if (GNUNET_YES == done_reading)
+  {
+    /* didn't expect any more data! */
+    GNUNET_break_op (0);
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  LOG_DEBUG ("Read %u bytes\n", (unsigned int) sread);
+  /* FIXME: could introduce a GNUNET_MST_read2 to read
+     directly from 'stdin_fd' and save a memcpy() here */
+  if (GNUNET_OK !=
+      GNUNET_MST_from_buffer (tokenizer, buf, sread, GNUNET_NO, GNUNET_NO))
+  {
+    GNUNET_break (0);
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  read_task_id /* No timeout while reading */
+    = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+                                      stdin_fd,
+                                      &read_task,
+                                      NULL);
+}
+
+
+/**
+ * Main function that will be run.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be 
NULL!)
+ * @param cfg configuration
+ */
+static void
+run (void *cls,
+     char *const *args,
+     const char *cfgfile,
+     const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  LOG_DEBUG ("Starting interpreter loop helper...\n");
+  tokenizer = GNUNET_MST_create (&tokenizer_cb, NULL);
+  stdin_fd = GNUNET_DISK_get_handle_from_native (stdin);
+  stdout_fd = GNUNET_DISK_get_handle_from_native (stdout);
+  read_task_id = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+                                                 stdin_fd,
+                                                 &read_task,
+                                                 NULL);
+  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
+}
+
+
+/**
+ * Signal handler called for SIGCHLD.
+ */
+static void
+sighandler_child_death ()
+{
+  static char c;
+  int old_errno; /* back-up errno */
+
+  old_errno = errno;
+  GNUNET_break (
+    1 ==
+    GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle (sigpipe,
+                                                     
GNUNET_DISK_PIPE_END_WRITE),
+                            &c,
+                            sizeof(c)));
+  errno = old_errno;
+}
+
+
+/**
+ * Main function
+ *
+ * @param argc the number of command line arguments
+ * @param argv command line arg array
+ * @return return code
+ */
+int
+main (int argc, char **argv)
+{
+  struct GNUNET_SIGNAL_Context *shc_chld;
+  struct GNUNET_GETOPT_CommandLineOption options[] =
+  { GNUNET_GETOPT_OPTION_END };
+  int ret;
+
+  GNUNET_log_setup ("gnunet-helper-cmds",
+                    "DEBUG",
+                    NULL);
+  status = GNUNET_OK;
+  if (NULL ==
+      (sigpipe = GNUNET_DISK_pipe (GNUNET_DISK_PF_NONE)))
+  {
+    GNUNET_break (0);
+    return 1;
+  }
+  shc_chld =
+    GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD, &sighandler_child_death);
+  ret = GNUNET_PROGRAM_run (argc,
+                            argv,
+                            "gnunet-helper-cmds",
+                            "Helper for starting a local interpreter loop",
+                            options,
+                            &run,
+                            NULL);
+  GNUNET_SIGNAL_handler_uninstall (shc_chld);
+  shc_chld = NULL;
+  GNUNET_DISK_pipe_close (sigpipe);
+  if (GNUNET_OK != ret)
+    return 1;
+  return (GNUNET_OK == status) ? 0 : 1;
+}
+
+
+/* end of gnunet-helper-testbed.c */
diff --git a/src/testbed/plugin_testcmd.c b/src/testbed/plugin_testcmd.c
new file mode 100644
index 000000000..90e4a90a1
--- /dev/null
+++ b/src/testbed/plugin_testcmd.c
@@ -0,0 +1,87 @@
+/*
+     This file is part of GNUnet
+     Copyright (C) 2013, 2014 GNUnet e.V.
+
+     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
+     Affero General Public License for more details.
+
+     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
+ */
+
+/**
+ * @file testbed/plugin_testcmd.c
+ * @brief a plugin to provide the API for running test cases.
+ * @author t3sserakt
+ */
+#include "platform.h"
+#include "gnunet_testing_ng_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_testing_plugin.h"
+
+
+
+
+
+static void
+start_testcase ()
+{
+  struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
+
+  struct GNUNET_TESTING_Command commands[] = {
+    GNUNET_TESTING_cmd_hello_world_birth ("hello-world-birth-0",
+                                          &now),
+    GNUNET_TESTING_cmd_hello_world ("hello-world-0","hello-world-birth-0",""),
+    GNUNET_TESTING_cmd_end ()
+  };
+
+  GNUNET_TESTING_run (NULL,
+                      commands,
+                      GNUNET_TIME_UNIT_FOREVER_REL);
+
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls NULL
+ * @return the exported block API
+ */
+void *
+libgnunet_plugin_testcmd_init (void *cls)
+{
+  struct GNUNET_TESTING_PluginFunctions *api;
+
+  api = GNUNET_new (struct GNUNET_TESTING_PluginFunctions);
+  api->start_testcase = &start_testcase;
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls the return value from #libgnunet_plugin_block_test_init
+ * @return NULL
+ */
+void *
+libgnunet_plugin_testcmd_done (void *cls)
+{
+  struct GNUNET_TESTING_PluginFunctions *api = cls;
+
+  GNUNET_free (api);
+  return NULL;
+}
+
+
+/* end of plugin_gnsrecord_dns.c */
diff --git a/src/testbed/testbed_api.h b/src/testbed/testbed_api.h
index d4ef832ad..ea78a14ff 100644
--- a/src/testbed/testbed_api.h
+++ b/src/testbed/testbed_api.h
@@ -37,6 +37,11 @@
  */
 #define HELPER_TESTBED_BINARY "gnunet-helper-testbed"
 
+/**
+ * Cmds Helper binary name
+ */
+#define HELPER_CMDS_BINARY "gnunet-helper-cmds"
+
 
 /**
  * Enumeration of operations
diff --git a/src/testbed/testbed_api_cmd_netjail_start_testbed.c 
b/src/testbed/testbed_api_cmd_netjail_start_testbed.c
index 786084917..dc8196e94 100644
--- a/src/testbed/testbed_api_cmd_netjail_start_testbed.c
+++ b/src/testbed/testbed_api_cmd_netjail_start_testbed.c
@@ -248,7 +248,7 @@ start_testbed (struct NetJailState *ns, struct
                                m_char,
                                n_char,
                                GNUNET_OS_get_libexec_binary_path (
-                                 HELPER_TESTBED_BINARY),
+                                 HELPER_CMDS_BINARY),
                                NULL};
   unsigned int m = atoi (m_char);
   unsigned int n = atoi (n_char);
@@ -285,9 +285,8 @@ start_testbed (struct NetJailState *ns, struct
                          GNUNET_YES,
                          NETJAIL_EXEC_SCRIPT,
                          script_argv,
-                         &
-                         helper_mst,
-                         exp_cb,
+                         &helper_mst,
+                         &exp_cb,
                          tbc));
 
   struct GNUNET_HELPER_Handle *helper = ns->helper[tbc->count - 1];
diff --git a/src/testing/testing_api_loop.c b/src/testing/testing_api_loop.c
index 82f6d0cab..49ed48063 100644
--- a/src/testing/testing_api_loop.c
+++ b/src/testing/testing_api_loop.c
@@ -204,6 +204,8 @@ run_finish_task_next (void *cls)
   }
   else
   {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Next task finished with an error.\n");
     GNUNET_TESTING_interpreter_fail ();
   }
 
@@ -246,6 +248,8 @@ run_finish_task_sync (void *cls)
   }
   else
   {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Sync task finished with an error.\n");
     GNUNET_TESTING_interpreter_fail ();
   }
 }
@@ -325,16 +329,39 @@ GNUNET_TESTING_interpreter_fail ()
 {
   struct GNUNET_TESTING_Command *cmd = &is->commands[is->ip];
 
-  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-              "Failed at command `%s'\n",
-              cmd->label);
-  while (GNUNET_TESTING_cmd_is_batch (cmd))
+  if (GNUNET_SYSERR == is->result)
+    return; /* ignore, we already failed! */
+
+  if (NULL != cmd)
+  {
+    while (GNUNET_TESTING_cmd_is_batch (cmd))
+    {
+      cmd = GNUNET_TESTING_cmd_batch_get_current (cmd);
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  "Batch is at command `%s'\n",
+                  cmd->label);
+    }
+
+  }
+  else
   {
-    cmd = GNUNET_TESTING_cmd_batch_get_current (cmd);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Batch is at command `%s'\n",
+                "cmd is NULL.\n");
+  }
+
+  if (NULL == cmd->label)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Failed at command `%s'\n",
                 cmd->label);
+
   }
+  else
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "cmd->label is NULL.\n");
+  }
+
   is->result = GNUNET_SYSERR;
   GNUNET_SCHEDULER_shutdown ();
 }
@@ -386,7 +413,8 @@ interpreter_run (void *cls)
   {
 
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Running command END\n");
+                "Running command END %p\n",
+                is);
     is->result = GNUNET_OK;
     GNUNET_SCHEDULER_shutdown ();
     return;
@@ -394,8 +422,9 @@ interpreter_run (void *cls)
   else if (NULL != cmd)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Running command `%s'\n",
-                cmd->label);
+                "Running command `%s' %p\n",
+                cmd->label,
+                is);
   }
   cmd->start_time
     = cmd->last_req_time

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