starting with #5385 in earnest

1 files changed, 179 insertions, 0 deletions

diff --git a/src/cadet/cadet_api_list_peers.c b/src/cadet/cadet_api_list_peers.c
new file mode 100644
index 000000000..4bdc8b961
--- /dev/null
+++ b/src/cadet/cadet_api_list_peers.c
@@ -0,0 +1,179 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2011, 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/cadet_api.c
+ * @brief cadet api: client implementation of cadet service
+ * @author Bartlomiej Polot
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_constants.h"
+#include "gnunet_cadet_service.h"
+#include "cadet.h"
+#include "cadet_protocol.h"
+
+
+
+/**
+ * Ugly legacy hack.
+ */
+struct GNUNET_CADET_PeersLister
+{
+
+  /**
+   * Monitor callback
+   */
+  GNUNET_CADET_PeersCB peers_cb;
+
+  /**
+   * Info callback closure for @c info_cb.
+   */
+  void *peers_cb_cls;
+};
+
+
+/**
+ * Send message of @a type to CADET service of @a h
+ *
+ * @param h handle to CADET service
+ * @param type message type of trivial information request to send
+ */
+static void
+send_info_request (struct GNUNET_CADET_Handle *h,
+                   uint16_t type)
+{
+  struct GNUNET_MessageHeader *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg (msg,
+                       type);
+  GNUNET_MQ_send (h->mq,
+                  env);
+}
+
+
+/**
+ * Request information about peers known to the running cadet service.
+ * The callback will be called for every peer known to the service.
+ * Only one info request (of any kind) can be active at once.
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Handle to the cadet peer.
+ * @param callback Function to call with the requested data.
+ * @param callback_cls Closure for @c callback.
+ * @return #GNUNET_OK / #GNUNET_SYSERR
+ */
+int
+GNUNET_CADET_list_peers (struct GNUNET_CADET_Handle *h,
+                         GNUNET_CADET_PeersCB callback,
+                         void *callback_cls)
+{
+  if (NULL != h->info_cb.peers_cb)
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  send_info_request (h,
+                     GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
+  h->info_cb.peers_cb = callback;
+  h->info_cls = callback_cls;
+  return GNUNET_OK;
+}
+
+
+/**
+ * Cancel a peer info request. The callback will not be called (anymore).
+ *
+ * WARNING: unstable API, likely to change in the future!
+ *
+ * @param h Cadet handle.
+ * @return Closure given to GNUNET_CADET_get_peers().
+ */
+void *
+GNUNET_CADET_list_peers_cancel (struct GNUNET_CADET_Handle *h)
+{
+  void *cls = h->info_cls;
+
+  h->info_cb.peers_cb = NULL;
+  h->info_cls = NULL;
+  return cls;
+}
+
+
+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param message the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ *         #GNUNET_SYSERR otherwise
+ */
+static int
+check_get_peers (void *cls,
+                 const struct GNUNET_MessageHeader *message)
+{
+  size_t esize;
+
+  (void) cls;
+  esize = ntohs (message->size);
+  if (sizeof (struct GNUNET_CADET_LocalInfoPeer) == esize)
+    return GNUNET_OK;
+  if (sizeof (struct GNUNET_MessageHeader) == esize)
+    return GNUNET_OK;
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Process a local reply about info on all tunnels, pass info to the user.
+ *
+ * @param cls Closure (Cadet handle).
+ * @param msg Message itself.
+ */
+static void
+handle_get_peers (void *cls,
+                  const struct GNUNET_MessageHeader *msg)
+{
+  struct GNUNET_CADET_Handle *h = cls;
+  const struct GNUNET_CADET_LocalInfoPeer *info =
+    (const struct GNUNET_CADET_LocalInfoPeer *) msg;
+
+  if (NULL == h->info_cb.peers_cb)
+    return;
+  if (sizeof (struct GNUNET_CADET_LocalInfoPeer) == ntohs (msg->size))
+    h->info_cb.peers_cb (h->info_cls,
+                         &info->destination,
+                         (int) ntohs (info->tunnel),
+                         (unsigned int) ntohs (info->paths),
+                         0);
+  else
+    h->info_cb.peers_cb (h->info_cls,
+                         NULL,
+                         0,
+                         0,
+                         0);
+}
+
+
+
+
+