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Diffstat (limited to 'src/messenger/messenger_api.c')
| -rw-r--r-- | src/messenger/messenger_api.c | 568 |
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; +} |