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138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/* DHT.h
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*
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* An implementation of the DHT as seen in docs/DHT.txt
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*
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Copyright (C) 2013 Tox project All Rights Reserved.
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This file is part of Tox.
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Tox is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Tox is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DHT_H
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#define DHT_H
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#include "network.h"
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//Current time, unix format
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#define unix_time() ((uint32_t)time(NULL))
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//size of the client_id in bytes
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#define CLIENT_ID_SIZE 32
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typedef struct
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{
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char client_id[CLIENT_ID_SIZE];
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IP_Port ip_port;
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uint32_t timestamp;
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uint32_t last_pinged;
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}Client_data;
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//maximum number of clients stored per friend.
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#define MAX_FRIEND_CLIENTS 8
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typedef struct
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{
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char client_id[CLIENT_ID_SIZE];
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Client_data client_list[MAX_FRIEND_CLIENTS];
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}Friend;
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typedef struct
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{
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char client_id[CLIENT_ID_SIZE];
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IP_Port ip_port;
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}Node_format;
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typedef struct
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{
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IP_Port ip_port;
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uint32_t ping_id;
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uint32_t timestamp;
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}Pinged;
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//Add a new friend to the friends list
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//client_id must be CLIENT_ID_SIZE bytes long.
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//returns 0 if success
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//returns 1 if failure (friends list is full)
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int addfriend(char * client_id);
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//Delete a friend from the friends list
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//client_id must be CLIENT_ID_SIZE bytes long.
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//returns 0 if success
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//returns 1 if failure (client_id not in friends list)
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int delfriend(char * client_id);
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//Get ip of friend
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//client_id must be CLIENT_ID_SIZE bytes long.
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//ip must be 4 bytes long.
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//port must be 2 bytes long.
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//returns ip if success
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//returns ip of 0 if failure (This means the friend is either offline or we have not found him yet.)
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//returns ip of 1 if friend is not in list.
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IP_Port getfriendip(char * client_id);
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//Run this function at least a couple times per second (It's the main loop)
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void doDHT();
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//if we recieve a DHT packet we call this function so it can be handled.
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//Return 0 if packet is handled correctly.
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//return 1 if it didn't handle the packet or if the packet was shit.
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int DHT_handlepacket(char * packet, uint32_t length, IP_Port source);
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//Use this function to bootstrap the client
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//Sends a get nodes request to the given ip port
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void bootstrap(IP_Port ip_port);
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//TODO:
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//Add functions to save and load the state(client list, friends list)
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//Global variables
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//Our client id
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extern char self_client_id[CLIENT_ID_SIZE];
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//TODO: Move these out of here and put them into the .c file.
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//A list of the clients mathematically closest to ours.
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#define LCLIENT_LIST 32
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Client_data close_clientlist[LCLIENT_LIST];
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//Hard maximum number of friends
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#define MAX_FRIENDS 256
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//Let's start with a static array for testing.
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Friend friends_list[MAX_FRIENDS];
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uint16_t num_friends;
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//The list of ip ports along with the ping_id of what we sent them and a timestamp
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#define LPING_ARRAY 128
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Pinged pings[LPING_ARRAY];
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#define LSEND_NODES_ARRAY LPING_ARRAY/2
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Pinged send_nodes[LSEND_NODES_ARRAY];
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#endif |