mirror of https://github.com/deavminet/dnetd.git
724 lines
15 KiB
D
724 lines
15 KiB
D
/**
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* dconnection
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*
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* Client/server connection handler spawned
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* by socket connection dequeue loop.
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*
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* Handles all interactions between
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* the server and the specific client/server.
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*/
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module dnetd.dconnection;
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import core.thread : Thread;
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import std.socket : Socket;
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import bmessage;
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import tristanable.encoding : DataMessage;
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import core.sync.mutex : Mutex;
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import dnetd.dserver : DServer;
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import std.string : split;
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import dnetd.dchannel : DChannel;
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import std.conv : to;
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import std.stdio : writeln;
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import std.algorithm : reverse;
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public class DConnection : Thread
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{
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/* The connection type */
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public enum ConnectionType
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{
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CLIENT, SERVER, UNSPEC
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}
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/* Command types */
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public enum Command
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{
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JOIN,
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PART,
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AUTH,
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LINK,
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REGISTER,
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LIST,
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MSG,
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MEMBER_COUNT,
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MEMBER_LIST,
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SERVER_INFO,
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MOTD,
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UNKNOWN
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}
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/**
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* Connection information
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*/
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private DServer server;
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private Socket socket;
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private bool hasAuthed;
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private ConnectionType connType;
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private string username;
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/* Write lock for socket */
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/* TODO: Forgot how bmessage works, might need, might not, if multipel calls
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* then yes, if single then no as it is based off (well glibc's write)
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* thread safe code
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*/
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private Mutex writeLock;
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/* Reserved tag for push notifications */
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private long notificationTag = 0;
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this(DServer server, Socket socket)
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{
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/* Set the function to be called on thread start */
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super(&worker);
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/* Set the associated server */
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this.server = server;
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/* Set the socket */
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this.socket = socket;
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/* Set the default state */
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connType = ConnectionType.UNSPEC;
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/* Initialize locks */
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initLocks();
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/* Start the connection handler */
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start();
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}
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/**
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* Initializes mutexes
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*/
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private void initLocks()
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{
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/* Initialie the socket write lock */
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writeLock = new Mutex();
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}
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/**
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* Byte dequeue loop
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*/
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private void worker()
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{
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/* Received bytes (for bformat) */
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byte[] receivedBytes;
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/* Received message */
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DataMessage receivedMessage;
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while(true)
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{
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/**
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* Block to receive a bformat message
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*
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* (Does decoding for bformat too)
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*/
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writeln("waiting");
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bool status = receiveMessage(socket, receivedBytes);
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/* TODO: Check status */
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if(status)
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{
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/* Decode the tristanable message (tagged message) */
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receivedMessage = DataMessage.decode(receivedBytes);
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/* Process the message */
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process(receivedMessage);
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/* TODO: Tristanable needs reserved-tag support (client-side concern) */
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}
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else
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{
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/* TODO: Error handling */
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writeln("Error with receive: "~to!(string)(this));
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break;
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}
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}
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/* Clean up */
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cleanUp();
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}
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private void cleanUp()
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{
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writeln(to!(string)(this)~" Cleaning up connection...");
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/* Remove this user from all channels he is in */
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DChannel[] channels = server.getChannels();
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/* Loop through each channel */
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foreach(DChannel currentChannel; channels)
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{
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/* Check if you are a member of it */
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if(currentChannel.isMember(this))
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{
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/* Leave the channel */
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currentChannel.leave(this);
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writeln(to!(string)(this)~" Leaving '"~currentChannel.getName()~"'...");
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}
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}
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/* Remove this user from the connection queue */
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server.removeConnection(this);
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writeln(to!(string)(this)~" Connection cleaned up");
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}
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/* TODO: add mutex for writing with message and funciton for doing so */
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/**
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* Write to socket
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*
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* Encodes the byte array as a tristanable tagged
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* message and then encodes that as a bformat
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* message
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*
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* Locks the writeLock mutex, sends it over the
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* socket to the client/server, and unlocks the
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* mutex
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*/
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public bool writeSocket(long tag, byte[] data)
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{
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/* Send status */
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bool status;
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/* Create the tagged message */
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DataMessage message = new DataMessage(tag, data);
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writeln("writeSocket: mutex lock");
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/* Lock the write mutex */
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writeLock.lock();
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/* Send the message */
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writeln("writeSocket: Data: "~to!(string)(data)~" Tag: "~to!(string)(tag));
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status = sendMessage(socket, message.encode());
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/* Unlock the write mutex */
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writeLock.unlock();
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writeln("writeSocket: mutex unlock");
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return status;
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}
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private Command getCommand(byte commandByte)
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{
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Command command = Command.UNKNOWN;
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if(commandByte == cast(ulong)0)
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{
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command = Command.AUTH;
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}
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else if(commandByte == cast(ulong)1)
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{
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command = Command.LINK;
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}
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else if(commandByte == cast(ulong)2)
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{
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command = Command.REGISTER;
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}
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else if(commandByte == cast(ulong)3)
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{
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command = Command.JOIN;
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}
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else if(commandByte == cast(ulong)4)
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{
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command = Command.PART;
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}
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else if(commandByte == cast(ulong)5)
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{
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command = Command.MSG;
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}
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else if(commandByte == cast(ulong)6)
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{
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command = Command.LIST;
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}
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else if(commandByte == cast(ulong)7)
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{
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command = Command.MSG;
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}
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else if(commandByte == cast(ulong)8)
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{
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command = Command.MEMBER_COUNT;
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}
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else if(commandByte == cast(ulong)9)
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{
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command = Command.MEMBER_LIST;
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}
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else if(commandByte == cast(ulong)10)
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{
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command = Command.SERVER_INFO;
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}
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else if(commandByte == cast(ulong)11)
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{
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command = Command.MOTD;
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}
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return command;
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}
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/**
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* Process the received message
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*/
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private void process(DataMessage message)
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{
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/* Get the tag */
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/**
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* TODO: Client side will always do 1, because we don't have
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* multi-thread job processing, only need this to differentiate
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* between commands and async notifications
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*/
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long tag = message.tag;
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writeln("tag:", tag);
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/* The reply */
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byte[] reply;
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/* Get the command */
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byte commandByte = message.data[0];
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Command command = getCommand(commandByte);
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writeln(to!(string)(this)~" ~> "~to!(string)(command));
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/* If `auth` command (requires: unauthed) */
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if(command == Command.AUTH && !hasAuthed)
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{
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/* Get the length of the username */
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byte usernameLength = message.data[1];
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/* Get the username and password */
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string username = cast(string)message.data[2..cast(ulong)2+usernameLength];
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string password = cast(string)message.data[cast(ulong)2+usernameLength..message.data.length];
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/* Authenticate */
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bool status = authenticate(username, password);
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/* TODO: What to do on bad authetication? */
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/* Set the username */
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this.username = username;
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/* Set the type of this connection to `client` */
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connType = ConnectionType.CLIENT;
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hasAuthed = true;
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/* Encode the reply */
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reply = [status];
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}
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/* If `link` command (requires: unauthed) */
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else if(command == Command.LINK && !hasAuthed)
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{
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/* TODO: Implement me later */
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/* Check if this connection is a DLink'd one */
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//server.getMeyer().get
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/* Set the type of this connection to `server` */
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connType = ConnectionType.SERVER;
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hasAuthed = true;
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}
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/* If `register` command (requires: unauthed, client) */
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else if(command == Command.REGISTER && !hasAuthed && connType == ConnectionType.CLIENT)
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{
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}
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/* If `join` command (requires: authed, client) */
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else if(command == Command.JOIN && hasAuthed && connType == ConnectionType.CLIENT)
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{
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/* Get the channel names */
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string channelList = cast(string)message.data[1..message.data.length];
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string[] channels = split(channelList, ",");
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/**
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* Loop through each channel, check if it
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* exists, if so join it, else create it
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* and then join it
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*/
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bool isPresentInfo = false;
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foreach(string channelName; channels)
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{
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/**
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* Finds the channel, if it exists then it returns it,
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* if it does not exist then it will create it and then
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* return it
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*/
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DChannel channel = server.getChannel(this, channelName);
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/* Join the channel */
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isPresentInfo = channel.join(this);
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}
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/* TODO: Do reply */
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/* Encode the reply */
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reply = [isPresentInfo];
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}
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/* If `part` command (requires: authed, client) */
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else if(command == Command.PART && hasAuthed && connType == ConnectionType.CLIENT)
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{
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/* Get the channel names */
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string channelList = cast(string)message.data[1..message.data.length];
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string[] channels = split(channelList, ",");
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/**
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* Loop through each channel, check if it
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* exists, if so leave it
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*/
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foreach(string channelName; channels)
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{
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/* Attempt to find the channel */
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DChannel channel = server.getChannelByName(channelName);
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/* Leave a channel the channel only if it exists */
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if(!(channel is null))
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{
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channel.leave(this);
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}
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}
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/* TODO: Do reply */
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/* Encode the reply */
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reply = [true];
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}
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/* If `list` command (requires: authed, client) */
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else if(command == Command.LIST && hasAuthed && connType == ConnectionType.CLIENT)
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{
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/* Get all channels */
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DChannel[] channels = server.getChannels();
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/* Generate a list of channel names (CSV) */
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string channelList;
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for(ulong i = 0; i < channels.length; i++)
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{
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if(i == channels.length-1)
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{
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channelList ~= channels[i].getName();
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}
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else
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{
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channelList ~= channels[i].getName()~",";
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}
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}
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/* TODO: Reply */
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/* Encode the reply */
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reply = [true];
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reply ~= channelList;
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}
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/* If `msg` command (requires: authed, client) */
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else if(command == Command.MSG && hasAuthed && connType == ConnectionType.CLIENT)
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{
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/* Status */
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bool status = true;
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/* Get the type of message */
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byte messageType = message.data[1];
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/* Get the location length */
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byte locationLength = message.data[2];
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/* Get the channel/person name */
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string destination = cast(string)message.data[3..cast(ulong)3+locationLength];
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/* Get the message */
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string msg = cast(string)message.data[cast(ulong)3+locationLength..message.data.length];
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/* Send status */
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bool sendStatus;
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/* If we are sending to a user */
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if(messageType == cast(byte)0)
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{
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/* Send the message to the user */
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sendStatus = sendUserMessage(destination, msg);
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}
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/* If we are sending to a channel */
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else if(messageType == cast(ubyte)1)
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{
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/* The channel wanting to send to */
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DChannel channel = server.getChannelByName(destination);
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/* If the channel exists */
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if(channel)
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{
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/* TODO Implemet me */
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sendStatus = channel.sendMessage(this, msg);
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}
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/* If the channel does not exist */
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else
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{
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status = false;
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}
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}
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/* Unknown destination type */
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else
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{
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status = false;
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}
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/* TODO: Handling here, should we make the user wait? */
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/* Encode the reply */
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/* TODO: */
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reply = [status];
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}
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/* If `membercount` command (requires: authed, client) */
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else if(command == Command.MEMBER_COUNT && hasAuthed && connType == ConnectionType.CLIENT)
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{
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/* Status */
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bool status = true;
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/* Get the channel name */
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string channelName = cast(string)message.data[1..message.data.length];
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/* The memebr count */
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long memberCount;
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/* Get the member count */
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status = getMemberCount(channelName, memberCount);
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/* Encode the status */
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reply = [status];
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/* If there was no error fetching the member count */
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if(status)
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{
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/* Data bytes */
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byte[] numberBytes;
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numberBytes.length = 8;
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/* Encode the length (Big Endian) from Little Endian */
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numberBytes[0] = *((cast(byte*)&memberCount)+7);
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numberBytes[1] = *((cast(byte*)&memberCount)+6);
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numberBytes[2] = *((cast(byte*)&memberCount)+5);
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numberBytes[3] = *((cast(byte*)&memberCount)+4);
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numberBytes[4] = *((cast(byte*)&memberCount)+3);
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numberBytes[5] = *((cast(byte*)&memberCount)+2);
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numberBytes[6] = *((cast(byte*)&memberCount)+1);
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numberBytes[7] = *((cast(byte*)&memberCount)+0);
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/* Append the length */
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reply ~= numberBytes;
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}
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}
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/* If `memberlist` command (requires: authed, client) */
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else if(command == Command.MEMBER_LIST && hasAuthed && connType == ConnectionType.CLIENT)
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{
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/* Status */
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bool status = true;
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/* Get the channel name */
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string channelName = cast(string)message.data[1..message.data.length];
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/* Get the channel */
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DChannel channel = server.getChannelByName(channelName);
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/* Encode the status */
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reply ~= [channel !is null];
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/* If the channel exists */
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if(channel)
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{
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/* Get the list of members in the channel */
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DConnection[] members = channel.getMembers();
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/* Construct a CSV string of the members */
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string memberString;
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for(ulong i = 0; i < members.length; i++)
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{
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if(i == members.length-1)
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{
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memberString ~= members[i].getUsername();
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}
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else
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{
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memberString ~= members[i].getUsername()~",";
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}
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}
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/* Encode the string into the reply */
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reply ~= cast(byte[])memberString;
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}
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/* If the channel does not exist */
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else
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{
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status = false;
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}
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}
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/* If `serverinfo` command (requires: authed, !unspec) */
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else if(command == Command.SERVER_INFO && hasAuthed && connType != ConnectionType.UNSPEC)
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{
|
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/* Status */
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bool status = true;
|
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/* Get the server info */
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string serverInfo = server.getServerInfo();
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/* Encode the reply */
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reply ~= [status];
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reply ~= serverInfo;
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}
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/* If `motd` command (requires: _nothing_) */
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else if(command == Command.MOTD)
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{
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/* Status */
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bool status = true;
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/* Get the message of the day */
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string motd = server.getConfig().getGeneral().getMotd();
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/* Encode the reply */
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reply ~= [status];
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reply ~= motd;
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}
|
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/* If no matching built-in command was found */
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else
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{
|
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/* TODO: Check plugins */
|
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bool isPlugin = false;
|
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|
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/* A matching plugin was found */
|
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if(isPlugin)
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{
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/* TODO: Implement me */
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}
|
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/* The command was invalid */
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else
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{
|
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/* Write error message */
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reply = [2];
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}
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}
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|
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/* Write the response */
|
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writeSocket(tag, reply);
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}
|
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|
|
/**
|
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* Authenticate
|
|
*
|
|
* Login as a user with the given credentials
|
|
*/
|
|
private bool authenticate(string username, string password)
|
|
{
|
|
/* TODO: Implement me */
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get member count
|
|
*
|
|
* Gets the member count of a given channel
|
|
*/
|
|
private bool getMemberCount(string channelName, ref long count)
|
|
{
|
|
/* Status of operation */
|
|
bool status;
|
|
|
|
/* The channel */
|
|
DChannel channel = server.getChannelByName(channelName);
|
|
|
|
/* Check if the channel exists */
|
|
if(channel)
|
|
{
|
|
/* Get the channel count */
|
|
count = channel.getMemberCount();
|
|
|
|
|
|
status = true;
|
|
}
|
|
/* If the channel does not exist */
|
|
else
|
|
{
|
|
status = false;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Send user a message
|
|
*
|
|
* Sends the provided user the specified message
|
|
*/
|
|
private bool sendUserMessage(string username, string message)
|
|
{
|
|
/* Find the user to send to */
|
|
DConnection user = server.findUser(username);
|
|
|
|
writeln("sendUserMessage(): ", user);
|
|
|
|
/* If the user was found */
|
|
if(user)
|
|
{
|
|
/* The protocol data to send */
|
|
byte[] protocolData;
|
|
|
|
/* Set the sub-type (ntype=0) */
|
|
protocolData ~= [0];
|
|
|
|
/* Encode the sender's length */
|
|
protocolData ~= [cast(byte)username.length];
|
|
|
|
/* Encode the username */
|
|
protocolData ~= cast(byte[])username;
|
|
|
|
/* Encode the message */
|
|
protocolData ~= cast(byte[])message;
|
|
|
|
/* Send the messge */
|
|
bool sendStatus = user.writeSocket(0, protocolData);
|
|
|
|
return sendStatus;
|
|
}
|
|
/* If the user was not found */
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
public string getUsername()
|
|
{
|
|
return username;
|
|
}
|
|
|
|
public ConnectionType getConnectionType()
|
|
{
|
|
return connType;
|
|
}
|
|
|
|
public override string toString()
|
|
{
|
|
string toStr = "["~to!(string)(connType)~" (";
|
|
toStr ~= socket.remoteAddress.toString();
|
|
|
|
|
|
toStr ~= ")]: ";
|
|
|
|
|
|
if(connType == ConnectionType.CLIENT)
|
|
{
|
|
toStr = toStr ~ getUsername();
|
|
}
|
|
else
|
|
{
|
|
/* TODO Implement me */
|
|
}
|
|
|
|
return toStr;
|
|
}
|
|
}
|