1 files changed, 143 insertions, 0 deletions

diff --git a/src/cli/nse/gnunet-nse.c b/src/cli/nse/gnunet-nse.c
new file mode 100644
index 000000000..b88697695
--- /dev/null
+++ b/src/cli/nse/gnunet-nse.c
@@ -0,0 +1,143 @@
+/*
+      This file is part of GNUnet
+      Copyright (C) 2008--2014, 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 nse/gnunet-nse.c
+ * @brief Program to display network size estimates from the NSE service
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ */
+
+#include "platform.h"
+#include "gnunet_nse_service.h"
+#include <gnunet_util_lib.h>
+
+/**
+ * The handle to the NSE service
+ */
+static struct GNUNET_NSE_Handle *nse;
+
+/**
+ * The program status; 0 for success.
+ */
+static int status;
+
+/**
+ * Monitor flag.
+ */
+static int monitor;
+
+
+/**
+ * Task to shutdown and clean up all state
+ *
+ * @param cls NULL
+ */
+static void
+do_shutdown (void *cls)
+{
+  (void) cls;
+  if (NULL != nse)
+  {
+    GNUNET_NSE_disconnect (nse);
+    nse = NULL;
+  }
+}
+
+
+/**
+ * Callback to call when network size estimate is updated.
+ *
+ * @param cls NULL
+ * @param timestamp server timestamp
+ * @param estimate the value of the current network size estimate
+ * @param std_dev standard deviation (rounded down to nearest integer)
+ *                of the size estimation values seen
+ */
+static void
+handle_estimate (void *cls,
+                 struct GNUNET_TIME_Absolute timestamp,
+                 double estimate,
+                 double std_dev)
+{
+  (void) cls;
+  status = 0;
+  fprintf (stdout,
+           "%s: #peers=%f (ld(#peers)=%f, stddev=%f)\n",
+           GNUNET_STRINGS_absolute_time_to_string (timestamp),
+           GNUNET_NSE_log_estimate_to_n (estimate),
+           estimate,
+           std_dev);
+  if (! monitor)
+    GNUNET_SCHEDULER_shutdown ();
+}
+
+
+/**
+ * Actual main function that runs the emulation.
+ *
+ * @param cls unused
+ * @param args remaining args, unused
+ * @param cfgfile name of the configuration
+ * @param cfg configuration handle
+ */
+static void
+run (void *cls,
+     char *const *args,
+     const char *cfgfile,
+     const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  (void) cls;
+  (void) args;
+  (void) cfgfile;
+  nse = GNUNET_NSE_connect (cfg, &handle_estimate, NULL);
+  GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
+}
+
+
+/**
+ * Main function.
+ *
+ * @return 0 on success
+ */
+int
+main (int argc, char *const *argv)
+{
+  struct GNUNET_GETOPT_CommandLineOption options[] = {
+    GNUNET_GETOPT_option_flag ('m',
+                               "monitor",
+                               gettext_noop (
+                                 "Monitor and output current estimates"),
+                               &monitor),
+    GNUNET_GETOPT_OPTION_END
+  };
+
+  status = 1;
+  if (GNUNET_OK !=
+      GNUNET_PROGRAM_run (argc,
+                          argv,
+                          "gnunet-nse",
+                          gettext_noop (
+                            "Show network size estimates from NSE service."),
+                          options,
+                          &run,
+                          NULL))
+    return 2;
+  return status;
+}