1 files changed, 178 insertions, 0 deletions

diff --git a/src/cli/dht/gnunet-dht-hello.c b/src/cli/dht/gnunet-dht-hello.c
new file mode 100644
index 000000000..369ed5643
--- /dev/null
+++ b/src/cli/dht/gnunet-dht-hello.c
@@ -0,0 +1,178 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2022 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 dht/gnunet-dht-hello.c
+ * @brief Obtain HELLO from DHT for bootstrapping
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_dht_service.h"
+
+#define LOG(kind, ...) GNUNET_log_from (kind, "dht-clients", __VA_ARGS__)
+
+/**
+ * Handle to the DHT
+ */
+static struct GNUNET_DHT_Handle *dht_handle;
+
+/**
+ * Handle to the DHT hello get operation.
+ */
+static struct GNUNET_DHT_HelloGetHandle *get_hello_handle;
+
+/**
+ * Global status value
+ */
+static int global_ret;
+
+
+/**
+ * Task run to clean up on shutdown.
+ *
+ * @param cls unused
+ */
+static void
+cleanup_task (void *cls)
+{
+  if (NULL != get_hello_handle)
+  {
+    GNUNET_DHT_hello_get_cancel (get_hello_handle);
+    get_hello_handle = NULL;
+  }
+  if (NULL != dht_handle)
+  {
+    GNUNET_DHT_disconnect (dht_handle);
+    dht_handle = NULL;
+  }
+}
+
+
+/**
+ * Task run when we are finished. Triggers shutdown.
+ *
+ * @param cls unused
+ */
+static void
+hello_done_cb (void *cls)
+{
+  GNUNET_SCHEDULER_shutdown ();
+}
+
+
+/**
+ * Function called on our HELLO.
+ *
+ * @param cls closure
+ * @param url the HELLO URL
+ */
+static void
+hello_result_cb (void *cls,
+                 const char *url)
+{
+  get_hello_handle = NULL;
+  fprintf (stdout,
+           "%s\n",
+           url);
+  GNUNET_SCHEDULER_shutdown ();
+}
+
+
+/**
+ * Main function that will be run by the scheduler.
+ *
+ * @param cls closure, NULL
+ * @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)
+{
+  (void) cls;
+  (void) cfgfile;
+  GNUNET_SCHEDULER_add_shutdown (&cleanup_task,
+                                 NULL);
+  if (NULL == (dht_handle = GNUNET_DHT_connect (cfg,
+                                                1)))
+  {
+    fprintf (stderr,
+             _ ("Failed to connect to DHT service!\n"));
+    global_ret = EXIT_NOTCONFIGURED;
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  if (NULL == args[0])
+  {
+    get_hello_handle = GNUNET_DHT_hello_get (dht_handle,
+                                             &hello_result_cb,
+                                             NULL);
+    GNUNET_break (NULL != get_hello_handle);
+  }
+  else
+  {
+    GNUNET_DHT_hello_offer (dht_handle,
+                            args[0],
+                            &hello_done_cb,
+                            NULL);
+  }
+}
+
+
+/**
+ * Entry point for gnunet-dht-hello
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc,
+      char *const *argv)
+{
+  struct GNUNET_GETOPT_CommandLineOption options[] = {
+    GNUNET_GETOPT_OPTION_END
+  };
+  enum GNUNET_GenericReturnValue iret;
+
+  if (GNUNET_OK !=
+      GNUNET_STRINGS_get_utf8_args (argc, argv,
+                                    &argc, &argv))
+    return 2;
+  iret = GNUNET_PROGRAM_run (
+    argc,
+    argv,
+    "gnunet-dht-hello [URL]",
+    gettext_noop (
+      "Obtain HELLO from DHT or provide HELLO to DHT for bootstrapping"),
+    options,
+    &run,
+    NULL);
+  if (GNUNET_SYSERR == iret)
+    return EXIT_FAILURE;
+  if (GNUNET_NO == iret)
+    return EXIT_SUCCESS;
+  return global_ret;
+}
+
+
+/* end of gnunet-dht-hello.c */