1 files changed, 568 insertions, 0 deletions
diff --git a/src/messenger/messenger_api.c b/src/messenger/messenger_api.c
new file mode 100644
index 000000000..6401b18d7
--- /dev/null
+++ b/src/messenger/messenger_api.c
@@ -0,0 +1,568 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020 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
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/messenger_api.c
+ * @brief messenger api: client implementation of GNUnet MESSENGER service
+ */
+
+#include "gnunet_messenger_service.h"
+
+#include "gnunet-service-messenger.h"
+
+#include "messenger_api_handle.h"
+#include "messenger_api_message.h"
+
+const char*
+GNUNET_MESSENGER_name_of_kind (enum GNUNET_MESSENGER_MessageKind kind)
+{
+  switch (kind)
+  {
+  case GNUNET_MESSENGER_KIND_INFO:
+    return "INFO";
+  case GNUNET_MESSENGER_KIND_JOIN:
+    return "JOIN";
+  case GNUNET_MESSENGER_KIND_LEAVE:
+    return "LEAVE";
+  case GNUNET_MESSENGER_KIND_NAME:
+    return "NAME";
+  case GNUNET_MESSENGER_KIND_KEY:
+    return "KEY";
+  case GNUNET_MESSENGER_KIND_PEER:
+    return "PEER";
+  case GNUNET_MESSENGER_KIND_ID:
+    return "ID";
+  case GNUNET_MESSENGER_KIND_MISS:
+    return "MISS";
+  case GNUNET_MESSENGER_KIND_MERGE:
+    return "MERGE";
+  case GNUNET_MESSENGER_KIND_REQUEST:
+    return "REQUEST";
+  case GNUNET_MESSENGER_KIND_INVITE:
+    return "INVITE";
+  case GNUNET_MESSENGER_KIND_TEXT:
+    return "TEXT";
+  case GNUNET_MESSENGER_KIND_FILE:
+    return "FILE";
+  default:
+    return "UNKNOWN";
+  }
+}
+
+static int
+check_get_name (void *cls, const struct GNUNET_MESSENGER_NameMessage *msg)
+{
+  GNUNET_MQ_check_zero_termination(msg);
+  return GNUNET_OK;
+}
+
+static void
+handle_get_name (void *cls, const struct GNUNET_MESSENGER_NameMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const char *name = ((const char*) msg) + sizeof(*msg);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Set name of handle: %s\n", name);
+
+  set_handle_name (handle, strlen(name) > 0? name : NULL);
+}
+
+static void
+handle_get_key (void *cls, const struct GNUNET_MESSENGER_KeyMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const struct GNUNET_IDENTITY_PublicKey *pubkey = &(msg->pubkey);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Set key of handle: %s\n", GNUNET_IDENTITY_public_key_to_string (pubkey));
+
+  set_handle_key (handle, pubkey);
+
+  if (handle->identity_callback)
+    handle->identity_callback (handle->identity_cls, handle);
+}
+
+static void
+handle_member_id (void *cls, const struct GNUNET_MESSENGER_MemberMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const struct GNUNET_HashCode *key = &(msg->key);
+  const struct GNUNET_ShortHashCode *id = &(msg->id);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Set id of handle in room: %s\n", GNUNET_h2s (key));
+
+  struct GNUNET_MESSENGER_Room *room = GNUNET_CONTAINER_multihashmap_get (handle->rooms, key);
+
+  if (room)
+  {
+    if (!room->contact_id)
+      room->contact_id = GNUNET_new(struct GNUNET_ShortHashCode);
+
+    GNUNET_memcpy(room->contact_id, id, sizeof(*id));
+  }
+}
+
+static void
+handle_room_open (void *cls, const struct GNUNET_MESSENGER_RoomMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const struct GNUNET_HashCode *key = &(msg->key);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Opened room: %s\n", GNUNET_h2s (key));
+
+  open_handle_room (handle, key);
+}
+
+static void
+handle_room_entry (void *cls, const struct GNUNET_MESSENGER_RoomMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const struct GNUNET_PeerIdentity *door = &(msg->door);
+  const struct GNUNET_HashCode *key = &(msg->key);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Entered room: %s\n", GNUNET_h2s (key));
+
+  entry_handle_room_at (handle, door, key);
+}
+
+static void
+handle_room_close (void *cls, const struct GNUNET_MESSENGER_RoomMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const struct GNUNET_HashCode *key = &(msg->key);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Closed room: %s\n", GNUNET_h2s (key));
+
+  close_handle_room (handle, key);
+}
+
+static int
+check_recv_message (void *cls, const struct GNUNET_MESSENGER_RecvMessage *msg)
+{
+  const uint16_t full_length = ntohs (msg->header.size) - sizeof(msg->header);
+
+  if (full_length < sizeof(msg->hash))
+    return GNUNET_NO;
+
+  const uint16_t length = full_length - sizeof(msg->hash);
+  const char *buffer = ((const char*) msg) + sizeof(*msg);
+
+  struct GNUNET_MESSENGER_Message message;
+
+  if (length < sizeof(message.header))
+    return GNUNET_NO;
+
+  if (GNUNET_YES != decode_message (&message, length, buffer))
+    return GNUNET_NO;
+
+  return GNUNET_OK;
+}
+
+static void
+handle_recv_message (void *cls, const struct GNUNET_MESSENGER_RecvMessage *msg)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  const struct GNUNET_HashCode *key = &(msg->key);
+  const struct GNUNET_HashCode *hash = &(msg->hash);
+
+  const char *buffer = ((const char*) msg) + sizeof(*msg);
+
+  const uint16_t length = ntohs (msg->header.size) - sizeof(*msg);
+
+  struct GNUNET_MESSENGER_Message message;
+  decode_message (&message, length, buffer);
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Receiving message: %s\n", GNUNET_MESSENGER_name_of_kind (message.header.kind));
+
+  struct GNUNET_MESSENGER_Room *room = GNUNET_CONTAINER_multihashmap_get (handle->rooms, key);
+
+  if (room)
+  {
+    handle_room_message (room, &message, hash);
+
+    if (handle->msg_callback)
+      handle->msg_callback (handle->msg_cls, room, &message, hash);
+  }
+  else
+    GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESSENGER ERROR: Room not found\n");
+}
+
+static void
+reconnect (struct GNUNET_MESSENGER_Handle *handle);
+
+static void
+send_open_room (struct GNUNET_MESSENGER_Handle *handle, struct GNUNET_MESSENGER_Room *room)
+{
+  struct GNUNET_MESSENGER_RoomMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_OPEN);
+  GNUNET_memcpy(&(msg->key), &(room->key), sizeof(room->key));
+  GNUNET_MQ_send (handle->mq, env);
+}
+
+static void
+send_entry_room (struct GNUNET_MESSENGER_Handle *handle, struct GNUNET_MESSENGER_Room *room,
+                 const struct GNUNET_PeerIdentity *door)
+{
+  struct GNUNET_MESSENGER_RoomMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_ENTRY);
+  GNUNET_memcpy(&(msg->door), door, sizeof(*door));
+  GNUNET_memcpy(&(msg->key), &(room->key), sizeof(room->key));
+  GNUNET_MQ_send (handle->mq, env);
+}
+
+static void
+send_close_room (struct GNUNET_MESSENGER_Handle *handle, struct GNUNET_MESSENGER_Room *room)
+{
+  struct GNUNET_MESSENGER_RoomMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_CLOSE);
+  GNUNET_memcpy(&(msg->key), &(room->key), sizeof(room->key));
+  GNUNET_MQ_send (handle->mq, env);
+}
+
+static int
+iterate_reset_room (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+  struct GNUNET_MESSENGER_Room *room = value;
+
+  if (GNUNET_YES == room->opened)
+    send_open_room (handle, room);
+
+  struct GNUNET_MESSENGER_ListTunnel *entry = room->entries.head;
+
+  struct GNUNET_PeerIdentity door;
+
+  while (entry)
+  {
+    GNUNET_PEER_resolve (entry->peer, &door);
+
+    send_entry_room (handle, room, &door);
+
+    entry = entry->next;
+  }
+
+  return GNUNET_YES;
+}
+
+static void
+callback_reconnect (void *cls)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  handle->reconnect_task = NULL;
+  handle->reconnect_time = GNUNET_TIME_STD_BACKOFF(handle->reconnect_time)
+  ;
+
+  reconnect (handle);
+
+  GNUNET_CONTAINER_multihashmap_iterate (handle->rooms, iterate_reset_room, handle);
+}
+
+static int
+iterate_close_room (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+  struct GNUNET_MESSENGER_Room *room = value;
+
+  send_close_room (handle, room);
+
+  return GNUNET_YES;
+}
+
+static void
+callback_mq_error (void *cls, enum GNUNET_MQ_Error error)
+{
+  struct GNUNET_MESSENGER_Handle *handle = cls;
+
+  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MQ ERROR: %u\n", error);
+
+  GNUNET_CONTAINER_multihashmap_iterate (handle->rooms, iterate_close_room, handle);
+
+  if (handle->mq)
+  {
+    GNUNET_MQ_destroy (handle->mq);
+    handle->mq = NULL;
+  }
+
+  handle->reconnect_task = GNUNET_SCHEDULER_add_delayed (handle->reconnect_time, &callback_reconnect, handle);
+}
+
+static void
+reconnect (struct GNUNET_MESSENGER_Handle *handle)
+{
+  const struct GNUNET_MQ_MessageHandler handlers[] = { GNUNET_MQ_hd_var_size(
+      get_name, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_GET_NAME, struct GNUNET_MESSENGER_NameMessage, handle),
+                                                       GNUNET_MQ_hd_fixed_size(
+                                                           get_key, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_GET_KEY,
+                                                           struct GNUNET_MESSENGER_KeyMessage, handle),
+                                                       GNUNET_MQ_hd_fixed_size(
+                                                           member_id,
+                                                           GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_MEMBER_ID,
+                                                           struct GNUNET_MESSENGER_MemberMessage, handle),
+                                                       GNUNET_MQ_hd_fixed_size(room_open,
+                                                                               GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_OPEN,
+                                                                               struct GNUNET_MESSENGER_RoomMessage,
+                                                                               handle),
+                                                       GNUNET_MQ_hd_fixed_size(room_entry,
+                                                                               GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_ENTRY,
+                                                                               struct GNUNET_MESSENGER_RoomMessage,
+                                                                               handle),
+                                                       GNUNET_MQ_hd_fixed_size(room_close,
+                                                                               GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_CLOSE,
+                                                                               struct GNUNET_MESSENGER_RoomMessage,
+                                                                               handle),
+                                                       GNUNET_MQ_hd_var_size(
+                                                           recv_message,
+                                                           GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_RECV_MESSAGE,
+                                                           struct GNUNET_MESSENGER_RecvMessage, handle),
+                                                       GNUNET_MQ_handler_end() };
+
+  handle->mq = GNUNET_CLIENT_connect (handle->cfg,
+  GNUNET_MESSENGER_SERVICE_NAME,
+                                      handlers, &callback_mq_error, handle);
+}
+
+struct GNUNET_MESSENGER_Handle*
+GNUNET_MESSENGER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, const char *name,
+                          GNUNET_MESSENGER_IdentityCallback identity_callback, void *identity_cls,
+                          GNUNET_MESSENGER_MessageCallback msg_callback, void *msg_cls)
+{
+  struct GNUNET_MESSENGER_Handle *handle = create_handle (cfg, identity_callback, identity_cls, msg_callback, msg_cls);
+
+  reconnect (handle);
+
+  if (handle->mq)
+  {
+    const uint16_t name_len = name ? strlen (name) : 0;
+
+    struct GNUNET_MESSENGER_CreateMessage *msg;
+    struct GNUNET_MQ_Envelope *env;
+
+    env = GNUNET_MQ_msg_extra(msg, name_len + 1, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_CREATE);
+
+    char *extra = ((char*) msg) + sizeof(*msg);
+
+    if (name_len)
+      GNUNET_memcpy(extra, name, name_len);
+
+    extra[name_len] = '\0';
+
+    GNUNET_MQ_send (handle->mq, env);
+    return handle;
+  }
+  else
+  {
+    destroy_handle (handle);
+    return NULL;
+  }
+}
+
+int
+GNUNET_MESSENGER_update (struct GNUNET_MESSENGER_Handle *handle)
+{
+  if ((!handle) || (!get_handle_name(handle)))
+    return GNUNET_SYSERR;
+
+  struct GNUNET_MESSENGER_UpdateMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_UPDATE);
+  GNUNET_MQ_send (handle->mq, env);
+  return GNUNET_OK;
+}
+
+void
+GNUNET_MESSENGER_disconnect (struct GNUNET_MESSENGER_Handle *handle)
+{
+  if (!handle)
+    return;
+
+  struct GNUNET_MESSENGER_DestroyMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_DESTROY);
+  GNUNET_MQ_send (handle->mq, env);
+
+  destroy_handle (handle);
+}
+
+const char*
+GNUNET_MESSENGER_get_name (const struct GNUNET_MESSENGER_Handle *handle)
+{
+  if (!handle)
+    return NULL;
+
+  return get_handle_name (handle);
+}
+
+int
+GNUNET_MESSENGER_set_name (struct GNUNET_MESSENGER_Handle *handle, const char *name)
+{
+  if (!handle)
+    return GNUNET_SYSERR;
+
+  const uint16_t name_len = name ? strlen (name) : 0;
+
+  struct GNUNET_MESSENGER_NameMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg_extra(msg, name_len + 1, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_SET_NAME);
+
+  char *extra = ((char*) msg) + sizeof(*msg);
+
+  if (name_len)
+    GNUNET_memcpy(extra, name, name_len);
+
+  extra[name_len] = '\0';
+
+  GNUNET_MQ_send (handle->mq, env);
+  return GNUNET_YES;
+}
+
+const struct GNUNET_IDENTITY_PublicKey*
+GNUNET_MESSENGER_get_key (const struct GNUNET_MESSENGER_Handle *handle)
+{
+  if (!handle)
+    return NULL;
+
+  return get_handle_key (handle);
+}
+
+struct GNUNET_MESSENGER_Room*
+GNUNET_MESSENGER_open_room (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_HashCode *key)
+{
+  struct GNUNET_MESSENGER_Room *room = GNUNET_CONTAINER_multihashmap_get (handle->rooms, key);
+
+  if (!room)
+  {
+    room = create_room (handle, key);
+
+    if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (handle->rooms, key, room,
+                                                        GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
+    {
+      destroy_room (room);
+      return NULL;
+    }
+  }
+
+  send_open_room (handle, room);
+  return room;
+}
+
+struct GNUNET_MESSENGER_Room*
+GNUNET_MESSENGER_entry_room (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_PeerIdentity *door,
+                             const struct GNUNET_HashCode *key)
+{
+  struct GNUNET_MESSENGER_Room *room = GNUNET_CONTAINER_multihashmap_get (handle->rooms, key);
+
+  if (!room)
+  {
+    room = create_room (handle, key);
+
+    if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (handle->rooms, key, room,
+                                                        GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
+    {
+      destroy_room (room);
+      return NULL;
+    }
+  }
+
+  send_entry_room (handle, room, door);
+  return room;
+}
+
+void
+GNUNET_MESSENGER_close_room (struct GNUNET_MESSENGER_Room *room)
+{
+  send_close_room (room->handle, room);
+}
+
+struct GNUNET_MESSENGER_Contact*
+GNUNET_MESSENGER_get_member (const struct GNUNET_MESSENGER_Room *room, const struct GNUNET_ShortHashCode *id)
+{
+  return GNUNET_CONTAINER_multishortmap_get (room->members, id);
+}
+
+const char*
+GNUNET_MESSENGER_contact_get_name (const struct GNUNET_MESSENGER_Contact *contact)
+{
+  if (!contact)
+    return NULL;
+
+  return get_contact_name (contact);
+}
+
+const struct GNUNET_IDENTITY_PublicKey*
+GNUNET_MESSENGER_contact_get_key (const struct GNUNET_MESSENGER_Contact *contact)
+{
+  if (!contact)
+    return NULL;
+
+  return get_contact_key (contact);
+}
+
+void
+GNUNET_MESSENGER_send_message (struct GNUNET_MESSENGER_Room *room, const struct GNUNET_MESSENGER_Message *message)
+{
+  const uint16_t length = get_message_size (message);
+
+  struct GNUNET_MESSENGER_SendMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
+
+  env = GNUNET_MQ_msg_extra(msg, length, GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_SEND_MESSAGE);
+
+  GNUNET_memcpy(&(msg->key), &(room->key), sizeof(room->key));
+
+  char *buffer = ((char*) msg) + sizeof(*msg);
+  encode_message (message, length, buffer);
+
+  GNUNET_MQ_send (room->handle->mq, env);
+}
+
+const struct GNUNET_MESSENGER_Message*
+GNUNET_MESSENGER_get_message (const struct GNUNET_MESSENGER_Room *room, const struct GNUNET_HashCode *hash)
+{
+  const struct GNUNET_MESSENGER_Message *message = get_room_message (room, hash);
+
+  if (!message)
+  {
+    struct GNUNET_MESSENGER_RecvMessage *msg;
+    struct GNUNET_MQ_Envelope *env;
+
+    env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_ROOM_GET_MESSAGE);
+    GNUNET_memcpy(&(msg->key), &(room->key), sizeof(room->key));
+    GNUNET_memcpy(&(msg->hash), hash, sizeof(*hash));
+    GNUNET_MQ_send (room->handle->mq, env);
+  }
+
+  return message;
+}