forked from lesderid/salty-ircd
688 lines
15 KiB
D
688 lines
15 KiB
D
module ircd.connection;
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import std.stdio;
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import std.string;
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import std.algorithm;
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import std.range;
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import std.conv;
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import std.socket;
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import std.utf;
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import vibe.core.core;
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import vibe.stream.operations;
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import ircd.message;
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import ircd.server;
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import ircd.channel;
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import ircd.helpers;
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class Connection
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{
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private TCPConnection _connection;
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private Server _server;
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//TODO: Make into auto-properties (via template)
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string nick;
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string user;
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string realname;
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string hostname;
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char[] modes;
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@property auto channels() { return _server.channels.filter!(c => c.members.canFind(this)); }
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@property string mask() { return nick ~ "!" ~ user ~ "@" ~ hostname; }
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@property bool registered() { return nick !is null && user !is null; }
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@property bool isOperator() { return modes.canFind('o') || modes.canFind('O'); }
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@property string servername() { return _server.name; } //TODO: Support server linking
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string awayMessage;
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bool connected;
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this(TCPConnection connection, Server server)
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{
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_connection = connection;
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_server = server;
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connected = _connection.connected;
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}
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override int opCmp(Object o)
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{
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Connection other;
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if((other = cast(Connection)other) !is null)
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{
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return cmp(nick, other.nick);
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}
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return 0;
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}
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bool visibleTo(Connection other)
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{
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return !modes.canFind('i') || channels.any!(c => c.members.canFind(other));
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}
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void send(Message message)
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{
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string messageString = message.toString;
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writeln("S> " ~ messageString);
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_connection.write(messageString ~ "\r\n");
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}
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//sends the message to all clients who have a channel in common with this client
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void sendToPeers(Message message)
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{
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if(channels.empty)
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{
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return;
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}
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foreach(connection; channels.map!(c => c.members).fold!((a, b) => a ~ b).sort().uniq.filter!(c => c != this))
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{
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connection.send(message);
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}
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}
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void onDisconnect()
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{
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writeln("client disconnected");
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}
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void handle()
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{
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while(connected)
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{
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Message message = void;
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try
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{
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message = Message.fromString((cast(string)_connection.readLine()).chomp);
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}
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catch(Throwable)
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{
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//TODO: The actual Throwable could be useful?
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connected = _connection.connected;
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continue;
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}
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writeln("C> " ~ message.toString);
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//TODO: If RFC-strictness is off, ignore case
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switch(message.command)
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{
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case "NICK":
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onNick(message);
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break;
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case "USER":
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onUser(message);
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break;
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case "PING":
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//TODO: Connection timeout when we don't get a PONG
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send(Message(_server.name, "PONG", [_server.name, message.parameters[0]], true));
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break;
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case "PONG":
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//TODO: Handle pong
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break;
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case "QUIT":
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onQuit(message);
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break;
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case "JOIN":
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if(!registered) sendErrNotRegistered();
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else onJoin(message);
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break;
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case "PART":
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if(!registered) sendErrNotRegistered();
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else onPart(message);
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break;
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case "PRIVMSG":
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if(!registered) sendErrNotRegistered();
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else onPrivMsg(message);
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break;
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case "NOTICE":
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if(!registered) sendErrNotRegistered();
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else onNotice(message);
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break;
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case "WHO":
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if(!registered) sendErrNotRegistered();
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else onWho(message);
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break;
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case "AWAY":
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if(!registered) sendErrNotRegistered();
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else onAway(message);
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break;
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case "TOPIC":
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if(!registered) sendErrNotRegistered();
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else onTopic(message);
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break;
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case "NAMES":
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if(!registered) sendErrNotRegistered();
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else onNames(message);
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break;
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case "LIST":
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if(!registered) sendErrNotRegistered();
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else onList(message);
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break;
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case "INVITE":
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if(!registered) sendErrNotRegistered();
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else onInvite(message);
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break;
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default:
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writeln("unknown command '", message.command, "'");
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send(Message(_server.name, "421", [nick, message.command, "Unknown command"]));
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break;
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}
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}
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onDisconnect();
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}
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void onNick(Message message)
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{
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if(message.parameters.length == 0)
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{
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sendErrNoNickGiven();
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return;
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}
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auto newNick = message.parameters[0];
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if(!_server.isNickAvailable(newNick))
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{
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send(Message(_server.name, "433", [nick, newNick, "Nickname already in use"]));
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return;
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}
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if(nick !is null)
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{
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sendToPeers(Message(nick, "NICK", [newNick]));
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send(Message(nick, "NICK", [newNick]));
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}
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auto wasRegistered = registered;
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//TODO: Check validity etc.
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nick = newNick;
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if(!wasRegistered && registered)
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{
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sendWelcome();
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}
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}
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void onUser(Message message)
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{
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if(message.parameters.length < 4)
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{
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sendErrNeedMoreParams(message.command);
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return;
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}
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if(user !is null)
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{
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send(Message(_server.name, "462", [nick, "Unauthorized command (already registered)"], true));
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return;
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}
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auto wasRegistered = registered;
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//TODO: Maybe do something with the unused parameter?
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user = message.parameters[0];
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modes = modeMaskToModes(message.parameters[1]);
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realname = message.parameters[3];
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hostname = getHost();
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if(!wasRegistered && registered)
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{
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sendWelcome();
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}
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}
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void onQuit(Message message)
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{
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connected = false;
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send(Message(_server.name, "ERROR", ["Bye!"]));
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if(message.parameters.length > 0)
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{
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_server.quit(this, message.parameters[0]);
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}
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else
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{
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_server.quit(this, null);
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}
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}
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void onJoin(Message message)
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{
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if(message.parameters.length == 0)
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{
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sendErrNeedMoreParams(message.command);
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return;
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}
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auto channel = message.parameters[0];
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if(!Server.isValidChannelName(channel))
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{
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sendErrNoSuchChannel(channel);
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}
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else
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{
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_server.join(this, channel);
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}
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}
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void onPart(Message message)
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{
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if(message.parameters.length == 0)
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{
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sendErrNeedMoreParams(message.command);
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return;
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}
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//TODO: Support channel lists
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//TODO: Check if user is member of channel(s)
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auto channel = message.parameters[0];
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if(!Server.isValidChannelName(channel))
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{
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sendErrNoSuchChannel(channel);
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}
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else if(!channels.canFind!(c => c.name == channel))
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{
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send(Message(_server.name, "442", [nick, channel, "You're not on that channel"], true));
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}
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else
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{
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if(message.parameters.length > 1)
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{
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_server.part(this, channel, message.parameters[1]);
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}
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else
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{
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_server.part(this, channel, null);
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}
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}
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}
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void onPrivMsg(Message message)
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{
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//TODO: Support special message targets
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auto target = message.parameters[0];
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auto text = message.parameters[1];
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if(message.parameters.length == 0)
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{
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send(Message(_server.name, "411", [nick, "No recipient given (PRIVMSG)"], true));
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return;
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}
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if(message.parameters.length == 1)
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{
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send(Message(_server.name, "412", [nick, "No text to send"], true));
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return;
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}
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if(Server.isValidChannelName(target))
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{
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if(!_server.channels.canFind!(c => c.name == target))
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{
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sendErrNoSuchNick(target);
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}
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else
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{
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_server.privmsgToChannel(this, target, text);
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}
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}
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else if(Server.isValidNick(target))
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{
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if(!_server.connections.canFind!(c => c.nick == target))
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{
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sendErrNoSuchNick(target);
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}
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else
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{
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_server.privmsgToUser(this, target, text);
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auto targetUser = _server.connections.find!(c => c.nick == target)[0];
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if(targetUser.modes.canFind('a'))
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{
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sendRplAway(target, targetUser.awayMessage);
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}
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}
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}
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else
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{
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//is this the right reply?
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sendErrNoSuchNick(target);
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}
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}
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void onNotice(Message message)
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{
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//TODO: Support special message targets
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auto target = message.parameters[0];
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auto text = message.parameters[1];
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//TODO: Figure out what we are allowed to send exactly
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if(message.parameters.length < 2)
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{
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return;
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}
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if(Server.isValidChannelName(target))
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{
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if(_server.channels.canFind!(c => c.name == target))
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{
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_server.noticeToChannel(this, target, text);
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}
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}
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else if(Server.isValidNick(target) && _server.connections.canFind!(c => c.nick == target))
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{
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_server.noticeToUser(this, target, text);
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}
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}
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void onWho(Message message)
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{
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if(message.parameters.length == 0)
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{
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_server.whoGlobal(this, "*", false);
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}
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else
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{
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auto mask = message.parameters[0];
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auto operatorsOnly = message.parameters.length > 1 && message.parameters[1] == "o";
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if(_server.isValidChannelName(mask) && _server.channels.canFind!(c => c.name == mask))
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{
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_server.whoChannel(this, mask, operatorsOnly);
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}
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else
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{
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_server.whoGlobal(this, mask == "0" ? "*" : mask, operatorsOnly);
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}
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}
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auto name = message.parameters.length == 0 ? "*" : message.parameters[0];
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send(Message(_server.name, "315", [nick, name, "End of WHO list"], true));
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}
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void onAway(Message message)
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{
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if(message.parameters.length == 0)
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{
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//NOTE: byCodeUnit is necessary due to auto-decoding (https://wiki.dlang.org/Language_issues#Unicode_and_ranges)
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modes = modes.byCodeUnit.remove!(a => a == 'a').array;
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awayMessage = null;
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send(Message(_server.name, "305", [nick, "You are no longer marked as being away"], true));
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}
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else
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{
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modes ~= 'a';
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awayMessage = message.parameters[0];
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send(Message(_server.name, "306", [nick, "You have been marked as being away"], true));
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}
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}
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void onTopic(Message message)
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{
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if(message.parameters.length == 0)
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{
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sendErrNeedMoreParams(message.command);
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return;
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}
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auto channelName = message.parameters[0];
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if(message.parameters.length == 1)
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{
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if(!_server.channels.canFind!(c => c.name == channelName && (!(c.modes.canFind('s') || c.modes.canFind('p')) || c.members.canFind(this))))
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{
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//NOTE: The RFCs don't allow ERR_NOSUCHCHANNEL as a response to TOPIC
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//TODO: If RFC-strictness is off, do send ERR_NOSUCHCHANNEL
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send(Message(_server.name, "331", [nick, channelName, "No topic is set"], true));
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}
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else
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{
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_server.sendChannelTopic(this, channelName);
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}
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}
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else
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{
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auto newTopic = message.parameters[1];
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if(!channels.canFind!(c => c.name == channelName))
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{
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sendErrNotOnChannel(channelName);
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}
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//TODO: Allow operators to set flags
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else if(channels.find!(c => c.name == channelName).map!(c => c.modes.canFind('t') /* && this user isn't an operator */).array[0])
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{
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sendErrChanopPrivsNeeded(channelName);
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}
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else
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{
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_server.setChannelTopic(this, channelName, newTopic);
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}
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}
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}
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void onNames(Message message)
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{
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if(message.parameters.length > 1)
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{
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notImplemented("forwarding NAMES to another server");
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return;
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}
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if(message.parameters.length == 0)
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{
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_server.sendGlobalNames(this);
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}
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else
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{
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foreach(channelName; message.parameters[0].split(','))
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{
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if(_server.channels.canFind!(c => c.name == channelName && c.visibleTo(this)))
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{
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_server.sendChannelNames(this, channelName);
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}
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else
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{
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sendRplEndOfNames(channelName);
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}
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}
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}
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}
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void onList(Message message)
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{
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if(message.parameters.length > 1)
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{
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notImplemented("forwarding LIST to another server");
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return;
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}
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if(message.parameters.length == 0)
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{
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_server.sendFullList(this);
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}
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else
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{
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auto channelNames = message.parameters[0].split(',');
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_server.sendPartialList(this, channelNames);
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}
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}
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void onInvite(Message message)
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{
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if(message.parameters.length < 2)
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{
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sendErrNeedMoreParams(message.command);
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return;
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}
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auto targetNick = message.parameters[0];
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auto targetUserRange = _server.connections.find!(c => c.nick == targetNick);
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if(targetUserRange.empty)
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{
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sendErrNoSuchNick(targetNick);
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return;
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}
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auto targetUser = targetUserRange[0];
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auto channelName = message.parameters[1];
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auto channelRange = _server.channels.find!(c => c.name == channelName);
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if(channelRange.empty)
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{
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_server.invite(this, targetUser.nick, channelName);
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sendRplInviting(channelName, targetUser.nick);
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if(targetUser.modes.canFind('a'))
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{
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sendRplAway(targetUser.nick, targetUser.awayMessage);
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}
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}
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else
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{
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auto channel = channelRange[0];
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if(!channel.members.canFind(this))
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{
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sendErrNotOnChannel(channel.name);
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}
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else if(channel.members.canFind(targetUser))
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{
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send(Message(_server.name, "443", [nick, targetUser.nick, channel.name, "is already on channel"], true));
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}
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else if(channel.modes.canFind('i') /* TODO: and this connection isn't a chanop */)
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{
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sendErrChanopPrivsNeeded(channel.name);
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}
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else
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{
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_server.invite(this, targetUser.nick, channel.name);
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sendRplInviting(channel.name, targetUser.nick);
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if(targetUser.modes.canFind('a'))
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{
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sendRplAway(targetUser.nick, targetUser.awayMessage);
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}
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}
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}
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}
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void sendWhoReply(string channel, Connection user, uint hopCount)
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{
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auto flags = user.modes.canFind('a') ? "G" : "H";
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if(user.isOperator) flags ~= "*";
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//TODO: Add channel prefix
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send(Message(_server.name, "352", [nick, channel, user.user, user.hostname, user.servername, user.nick, flags, hopCount.to!string ~ " " ~ user.realname], true));
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}
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void sendRplAway(string target, string message)
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{
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send(Message(_server.name, "301", [nick, target, message], true));
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}
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void sendRplList(string channelName, ulong visibleCount, string topic)
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{
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send(Message(_server.name, "322", [nick, channelName, visibleCount.to!string, topic], true));
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}
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void sendRplListEnd()
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{
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send(Message(_server.name, "323", [nick, "End of LIST"], true));
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}
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void sendRplInviting(string channelName, string name)
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{
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//TODO: If RFC-strictness is off, send parameters in reverse order
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send(Message(_server.name, "341", [nick, channelName, name]));
|
|
}
|
|
|
|
void sendRplEndOfNames(string channelName)
|
|
{
|
|
send(Message(_server.name, "366", [nick, channelName, "End of NAMES list"], true));
|
|
}
|
|
|
|
void sendErrNoSuchNick(string name)
|
|
{
|
|
send(Message(_server.name, "401", [nick, name, "No such nick/channel"], true));
|
|
}
|
|
|
|
void sendErrNoSuchChannel(string name)
|
|
{
|
|
send(Message(_server.name, "403", [nick, name, "No such channel"], true));
|
|
}
|
|
|
|
void sendErrNoNickGiven()
|
|
{
|
|
send(Message(_server.name, "431", [nick, "No nickname given"], true));
|
|
}
|
|
|
|
void sendErrNotOnChannel(string channel)
|
|
{
|
|
send(Message(_server.name, "442", [nick, channel, "You're not on that channel"], true));
|
|
}
|
|
|
|
void sendErrNotRegistered()
|
|
{
|
|
send(Message(_server.name, "451", ["(You)", "You have not registered"], true));
|
|
}
|
|
|
|
void sendErrNeedMoreParams(string command)
|
|
{
|
|
send(Message(_server.name, "461", [nick, command, "Not enough parameters"], true));
|
|
}
|
|
|
|
void sendErrChanopPrivsNeeded(string channel)
|
|
{
|
|
send(Message(_server.name, "482", [nick, channel, "You're not channel operator"], true));
|
|
}
|
|
|
|
void notImplemented(string description)
|
|
{
|
|
send(Message(_server.name, "ERROR", ["Not implemented yet (" ~ description ~ ")"], true));
|
|
}
|
|
|
|
void sendWelcome()
|
|
{
|
|
send(Message(_server.name, "001", [nick, "Welcome to the Internet Relay Network " ~ mask], true));
|
|
send(Message(_server.name, "002", [nick, "Your host is " ~ _server.name ~ ", running version " ~ _server.versionString], true));
|
|
send(Message(_server.name, "003", [nick, "This server was created " ~ _server.creationDate], true));
|
|
send(Message(_server.name, "004", [nick, _server.name, _server.versionString, "w", "snt"]));
|
|
}
|
|
|
|
string getHost()
|
|
{
|
|
auto address = parseAddress(_connection.peerAddress);
|
|
auto hostname = address.toHostNameString;
|
|
if(hostname is null)
|
|
{
|
|
hostname = address.toAddrString;
|
|
}
|
|
return hostname;
|
|
}
|
|
|
|
char[] modeMaskToModes(string maskString)
|
|
{
|
|
import std.conv : to;
|
|
import std.exception : ifThrown;
|
|
|
|
auto mask = maskString.to!ubyte.ifThrown(0);
|
|
|
|
char[] modes;
|
|
|
|
if(mask & 0b100)
|
|
{
|
|
modes ~= 'w';
|
|
}
|
|
if(mask & 0b1000)
|
|
{
|
|
modes ~= 'i';
|
|
}
|
|
|
|
return modes;
|
|
}
|
|
}
|
|
|