implementing libgnunettransportaddress

2 files changed, 256 insertions, 0 deletions

diff --git a/src/transport/Makefile.am b/src/transport/Makefile.am
index 93615b023..9cf16ddb6 100644
--- a/src/transport/Makefile.am
+++ b/src/transport/Makefile.am
@@ -154,6 +154,7 @@ endif
 
 lib_LTLIBRARIES = \
   libgnunettransport.la \
+  libgnunettransportaddress.la \
   libgnunettransportcore.la \
   libgnunettransportcommunicator.la \
   libgnunettransportmonitor.la \
@@ -197,6 +198,15 @@ libgnunettransport_la_LDFLAGS = \
 
 
 
+libgnunettransportaddress_la_SOURCES = \
+  transport_api2_address.c
+libgnunettransportaddress_la_LIBADD = \
+  $(top_builddir)/src/util/libgnunetutil.la \
+  $(GN_LIBINTL)
+libgnunettransportaddress_la_LDFLAGS = \
+  $(GN_LIB_LDFLAGS) $(WINFLAGS) \
+  -version-info 0:0:0
+
 libgnunettransportcore_la_SOURCES = \
   transport_api2_core.c
 libgnunettransportcore_la_LIBADD = \
diff --git a/src/transport/transport_api2_address.c b/src/transport/transport_api2_address.c
new file mode 100644
index 000000000..0693a51ac
--- /dev/null
+++ b/src/transport/transport_api2_address.c
@@ -0,0 +1,246 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2009-2013, 2016, 2018, 2019 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 transport/transport_api2_address.c
+ * @brief library to inform the transport service about addresses to be validated
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_constants.h"
+#include "gnunet_protocols.h"
+#include "gnunet_transport_address_service.h"
+#include "gnunet_ats_transport_service.h"
+#include "transport.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "transport-api-address",__VA_ARGS__)
+
+
+/**
+ * Handle for the transport service (includes all of the
+ * state for the transport service).
+ */
+struct GNUNET_TRANSPORT_AddressHandle
+{
+
+  /**
+   * My client connection to the transport service.
+   */
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * My configuration.
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  /**
+   * ID of the task trying to reconnect to the service.
+   */
+  struct GNUNET_SCHEDULER_Task *reconnect_task;
+
+  /**
+   * Delay until we try to reconnect.
+   */
+  struct GNUNET_TIME_Relative reconnect_delay;
+
+};
+
+
+/**
+ * Function that will schedule the job that will try
+ * to connect us again to the client.
+ *
+ * @param h transport service to reconnect
+ */
+static void
+disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_AddressHandle *h);
+
+
+/**
+ * Generic error handler, called with the appropriate
+ * error code and the same closure specified at the creation of
+ * the message queue.
+ * Not every message queue implementation supports an error handler.
+ *
+ * @param cls closure with the `struct GNUNET_TRANSPORT_AddressHandle *`
+ * @param error error code
+ */
+static void
+mq_error_handler (void *cls,
+                  enum GNUNET_MQ_Error error)
+{
+  struct GNUNET_TRANSPORT_AddressHandle *h = cls;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Error receiving from transport service, disconnecting temporarily.\n");
+  disconnect_and_schedule_reconnect (h);
+}
+
+
+/**
+ * Try again to connect to transport service.
+ *
+ * @param cls the handle to the transport service
+ */
+static void
+reconnect (void *cls)
+{
+  struct GNUNET_TRANSPORT_AddressHandle *h = cls;
+  struct GNUNET_MQ_MessageHandler handlers[] = {
+    GNUNET_MQ_handler_end ()
+  };
+
+  h->reconnect_task = NULL;
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Connecting to transport service.\n");
+  GNUNET_assert (NULL == h->mq);
+  h->mq = GNUNET_CLIENT_connect (h->cfg,
+                                 "transport",
+                                 handlers,
+                                 &mq_error_handler,
+                                 h);
+}
+
+
+/**
+ * Disconnect from the transport service.
+ *
+ * @param h transport service to reconnect
+ */
+static void
+disconnect (struct GNUNET_TRANSPORT_AddressHandle *h)
+{
+  if (NULL != h->mq)
+  {
+    GNUNET_MQ_destroy (h->mq);
+    h->mq = NULL;
+  }
+}
+
+
+/**
+ * Function that will schedule the job that will try
+ * to connect us again to the client.
+ *
+ * @param h transport service to reconnect
+ */
+static void
+disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_AddressHandle *h)
+{
+  GNUNET_assert (NULL == h->reconnect_task);
+  disconnect (h);
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Scheduling task to reconnect to transport service in %s.\n",
+       GNUNET_STRINGS_relative_time_to_string (h->reconnect_delay,
+                                               GNUNET_YES));
+  h->reconnect_task =
+      GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
+                                    &reconnect,
+                                    h);
+  h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
+}
+
+
+/**
+ * Connect to the transport service.
+ *
+ * @param cfg configuration to use
+ * @return NULL on error
+ */
+struct GNUNET_TRANSPORT_AddressHandle *
+GNUNET_TRANSPORT_address_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  struct GNUNET_TRANSPORT_AddressHandle *h;
+
+  h = GNUNET_new (struct GNUNET_TRANSPORT_AddressHandle);
+  h->cfg = cfg;
+  h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Connecting to transport service\n");
+  reconnect (h);
+  if (NULL == h->mq)
+  {
+    GNUNET_free (h);
+    return NULL;
+  }
+  return h;
+}
+
+
+/**
+ * Disconnect from the transport service.
+ *
+ * @param handle handle to the service as returned from #GNUNET_TRANSPORT_address_connect()
+ */
+void
+GNUNET_TRANSPORT_address_disconnect (struct GNUNET_TRANSPORT_AddressHandle *handle)
+{
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Transport disconnect called!\n");
+  /* this disconnects all neighbours... */
+  disconnect (handle);
+  /* and now we stop trying to connect again... */
+  if (NULL != handle->reconnect_task)
+  {
+    GNUNET_SCHEDULER_cancel (handle->reconnect_task);
+    handle->reconnect_task = NULL;
+  }
+  GNUNET_free (handle);
+}
+
+
+/**
+ * The client has learned about a possible address for peer @a pid
+ * (i.e. via broadcast, multicast, DHT, ...).  The transport service
+ * should consider validating it. Note that the plugin is NOT expected
+ * to have verified the signature, the transport service must decide
+ * whether to check the signature.
+ *
+ * While the notification is sent to @a ch asynchronously, this API
+ * does not return a handle as the delivery of addresses is simply
+ * unreliable, and if @a ch is down, the data provided will simply be
+ * lost.
+ *
+ * @param ch communicator handle
+ * @param raw raw address data
+ * @param raw_size number of bytes in @a raw
+ */
+void
+GNUNET_TRANSPORT_address_try (struct GNUNET_TRANSPORT_AddressHandle *ch,
+                              const void *raw,
+                              const size_t raw_size)
+{
+  struct GNUNET_MQ_Envelope *env;
+  struct GNUNET_MessageHeader *hdr;
+
+  env = GNUNET_MQ_msg_extra (hdr,
+                             raw_size,
+                             GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_CONSIDER_VERIFY);
+  memcpy (&hdr[1],
+          raw,
+          raw_size);
+  GNUNET_MQ_send (ch->mq,
+                  env);
+}
+
+
+
+/* end of transport_api2_address.c */