1 files changed, 195 insertions, 0 deletions

diff --git a/src/service/cadet/gnunet-service-cadet_hello.c b/src/service/cadet/gnunet-service-cadet_hello.c
new file mode 100644
index 000000000..cc28f0fde
--- /dev/null
+++ b/src/service/cadet/gnunet-service-cadet_hello.c
@@ -0,0 +1,195 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2014, 2017 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 cadet/gnunet-service-cadet_hello.c
+ * @brief spread knowledge about how to contact us (get HELLO from peerinfo),
+ *         and remember HELLOs of other peers we have an interest in
+ * @author Bartlomiej Polot
+ * @author Christian Grothoff
+ */
+#include "gnunet_common.h"
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_peerstore_service.h"
+#include "cadet_protocol.h"
+#include "gnunet-service-cadet.h"
+#include "gnunet-service-cadet_dht.h"
+#include "gnunet-service-cadet_hello.h"
+#include "gnunet-service-cadet_peer.h"
+
+#define LOG(level, ...) GNUNET_log_from (level, "cadet-hll", __VA_ARGS__)
+
+/**
+ * Hello message of local peer.
+ */
+static struct GNUNET_MessageHeader *mine;
+
+/**
+ * Handle to the PEERSTORE service.
+ */
+static struct GNUNET_PEERSTORE_Handle *peerstore;
+
+/**
+ * Our peerstore notification context.  We use notification
+ * to instantly learn about new peers as they are discovered.
+ */
+static struct GNUNET_PEERSTORE_Monitor *peerstore_notify;
+
+
+/**
+ * Process each hello message received from peerinfo.
+ *
+ * @param cls Closure (unused).
+ * @param id Identity of the peer.
+ * @param hello Hello of the peer.
+ * @param err_msg Error message.
+ */
+static void
+got_hello (void *cls,
+           const struct GNUNET_PEERSTORE_Record *record,
+           const char *err_msg)
+{
+  struct CadetPeer *peer;
+  struct GNUNET_HELLO_Builder *builder;
+  struct GNUNET_MessageHeader *hello;
+
+  if (NULL == record->value)
+  {
+    GNUNET_PEERSTORE_monitor_next (peerstore_notify, 1);
+    return;
+  }
+  hello = record->value;
+  if (0 == GNUNET_memcmp (&record->peer,
+                          &my_full_id))
+  {
+    GNUNET_free (mine);
+    builder = GNUNET_HELLO_builder_from_msg (hello);
+    mine = GNUNET_HELLO_builder_to_dht_hello_msg (builder,
+                                                  my_private_key,
+                                                  GNUNET_TIME_UNIT_ZERO);
+    GNUNET_HELLO_builder_free (builder);
+    GCD_hello_update ();
+    GNUNET_PEERSTORE_monitor_next (peerstore_notify, 1);
+    return;
+  }
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Hello for %s (%d bytes), expires on %s\n",
+       GNUNET_i2s (&record->peer),
+       ntohs (hello->size),
+       GNUNET_STRINGS_absolute_time_to_string (
+         GNUNET_HELLO_builder_get_expiration_time (hello)));
+  peer = GCP_get (&record->peer,
+                  GNUNET_YES);
+  GCP_set_hello (peer,
+                 hello);
+  GNUNET_PEERSTORE_monitor_next (peerstore_notify, 1);
+}
+
+
+static void
+error_cb (void *cls)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+              "Error in PEERSTORE monitoring\n");
+}
+
+
+static void
+sync_cb (void *cls)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+              "Done with initial PEERSTORE iteration during monitoring\n");
+}
+
+
+/**
+ * Initialize the hello subsystem.
+ *
+ * @param c Configuration.
+ */
+void
+GCH_init (const struct GNUNET_CONFIGURATION_Handle *c)
+{
+  GNUNET_assert (NULL == peerstore_notify);
+  peerstore = GNUNET_PEERSTORE_connect (c);
+  peerstore_notify =
+    GNUNET_PEERSTORE_monitor_start (c,
+                                    GNUNET_YES,
+                                    "peerstore",
+                                    NULL,
+                                    GNUNET_PEERSTORE_HELLO_KEY,
+                                    &error_cb,
+                                    NULL,
+                                    &sync_cb,
+                                    NULL,
+                                    &got_hello,
+                                    NULL);
+}
+
+
+/**
+ * Shut down the hello subsystem.
+ */
+void
+GCH_shutdown ()
+{
+  if (NULL != peerstore_notify)
+  {
+    GNUNET_PEERSTORE_monitor_stop (peerstore_notify);
+    peerstore_notify = NULL;
+  }
+  if (NULL != peerstore)
+  {
+    GNUNET_PEERSTORE_disconnect (peerstore);
+    peerstore = NULL;
+  }
+  if (NULL != mine)
+  {
+    GNUNET_free (mine);
+    mine = NULL;
+  }
+}
+
+
+/**
+ * Get own hello message.
+ *
+ * @return Own hello message.
+ */
+const struct GNUNET_MessageHeader *
+GCH_get_mine (void)
+{
+  struct GNUNET_HELLO_Builder *builder;
+
+  if (NULL == mine)
+  {
+    builder = GNUNET_HELLO_builder_new (&my_full_id);
+    mine = GNUNET_HELLO_builder_to_dht_hello_msg (builder,
+                                                  my_private_key,
+                                                  GNUNET_TIME_UNIT_ZERO);
+    GNUNET_HELLO_builder_free (builder);
+  }
+  return mine;
+}
+
+
+/* end of gnunet-service-cadet-new_hello.c */