1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
7 * <brain@chatspike.net>
8 * <Craig@chatspike.net>
10 * Written by Craig Edwards, Craig McLure, and others.
11 * This program is free but copyrighted software; see
12 * the file COPYING for details.
14 * ---------------------------------------------------
17 #ifndef __INSP_SOCKET_H__
18 #define __INSP_SOCKET_H__
24 #include "inspircd_config.h"
28 * States which a socket may be in
30 enum InspSocketState { I_DISCONNECTED, I_CONNECTING, I_CONNECTED, I_LISTENING, I_ERROR };
33 * Error types which a socket may exhibit
35 enum InspSocketError { I_ERR_TIMEOUT, I_ERR_SOCKET, I_ERR_CONNECT, I_ERR_BIND, I_ERR_RESOLVE, I_ERR_WRITE, I_ERR_NOMOREFDS };
41 * InspSocket is an extendable socket class which modules
42 * can use for TCP socket support. It is fully integrated
43 * into InspIRCds socket loop and attaches its sockets to
44 * the core's instance of the SocketEngine class, meaning
45 * that any sockets you create have the same power and
46 * abilities as a socket created by the core itself.
47 * To use InspSocket, you must inherit a class from it,
48 * and use the InspSocket constructors to establish connections
51 class InspSocket : public Extensible
56 std::deque<std::string> outbuffer;
59 * The file descriptor of this socket
64 * The hostname connected to
69 * The port connected to, or the port
70 * this socket is listening on
75 * The state for this socket, either
76 * listening, connecting, connected
79 InspSocketState state;
82 * The host being connected to,
88 * The host being connected to,
94 * When this time is reached,
95 * the socket times out if it is
96 * in the CONNECTING state
101 * This value is true if the
102 * socket has timed out.
107 * Socket input buffer, used by read(). The class which
108 * extends InspSocket is expected to implement an extendable
109 * buffer which can grow much larger than 64k,
110 * this buffer is just designed to be temporary storage.
116 * The IP address being connected
117 * to stored in string form for
118 * easy retrieval by accessors.
123 * Client sockaddr structure used
126 insp_sockaddr client;
129 * Server sockaddr structure used
132 insp_sockaddr server;
135 * Used by accept() to indicate the
136 * sizes of the sockaddr_in structures
140 /** Flushes the write buffer
142 bool FlushWriteBuffer();
144 /** Set the queue sizes
145 * This private method sets the operating system queue
146 * sizes for this socket to 65535 so that it can queue
147 * more information without application-level queueing
148 * which was required in older software.
150 void SetQueues(int nfd);
152 /** When the socket has been marked as closing, this flag
153 * will be set to true, then the next time the socket is
154 * examined, the socket is deleted and closed.
158 /** Set to true when we're waiting for a write event.
159 * If this is true and a write event comes in, we
160 * call the write instead of the read method.
162 bool WaitingForWriteEvent;
167 * The default constructor does nothing
168 * and should not be used.
170 InspSocket(InspIRCd* SI);
173 * This constructor is used to associate
174 * an existing connecting with an InspSocket
175 * class. The given file descriptor must be
176 * valid, and when initialized, the InspSocket
177 * will be set with the given IP address
178 * and placed in CONNECTED state.
180 InspSocket(InspIRCd* SI, int newfd, const char* ip);
183 * This constructor is used to create a new
184 * socket, either listening for connections, or an outbound connection to another host.
185 * Note that if you specify a hostname in the 'ipaddr' parameter, this class will not
186 * connect. You must resolve your hostnames before passing them to InspSocket. To do so,
187 * you should use the nonblocking class 'Resolver'.
188 * @param ipaddr The IP to connect to, or bind to
189 * @param port The port number to connect to, or bind to
190 * @param listening true to listen on the given host:port pair, or false to connect to them
191 * @param maxtime Number of seconds to wait, if connecting, before the connection times out and an OnTimeout() event is generated
193 InspSocket(InspIRCd* SI, const std::string &ipaddr, int port, bool listening, unsigned long maxtime);
196 * This method is called when an outbound
197 * connection on your socket is completed.
198 * @return false to abort the connection, true to continue
200 virtual bool OnConnected();
203 * This method is called when an error occurs.
204 * A closed socket in itself is not an error,
205 * however errors also generate close events.
206 * @param e The error type which occured
208 virtual void OnError(InspSocketError e);
211 * When an established connection is terminated,
212 * the OnDisconnect method is triggered.
214 virtual int OnDisconnect();
217 * When there is data waiting to be read on a
218 * socket, the OnDataReady() method is called.
219 * Within this method, you *MUST* call the Read()
220 * method to read any pending data. At its lowest
221 * level, this event is signalled by the core via
222 * the socket engine. If you return false from this
223 * function, the core removes your socket from its
224 * list and erases it from the socket engine, then
225 * calls InspSocket::Close() and deletes it.
226 * @return false to close the socket
228 virtual bool OnDataReady();
230 virtual bool OnWriteReady();
233 * When an outbound connection fails, and the
234 * attempt times out, you will receive this event.
235 * The method will trigger once maxtime seconds are
236 * reached (as given in the constructor) just
237 * before the socket's descriptor is closed.
238 * A failed DNS lookup may cause this event if
239 * the DNS server is not responding, as well as
240 * a failed connect() call, because DNS lookups are
241 * nonblocking as implemented by this class.
243 virtual void OnTimeout();
246 * Whenever close() is called, OnClose() will be
247 * called first. Please note that this means
248 * OnClose will be called alongside OnError(),
249 * OnTimeout(), and Close(), and also when
250 * cancelling a listening socket by calling
251 * the destructor indirectly.
253 virtual void OnClose();
256 * Reads all pending bytes from the socket
257 * into a char* array which can be up to
258 * 16 kilobytes in length.
260 virtual char* Read();
263 * Returns the IP address associated with
264 * this connection, or an empty string if
265 * no IP address exists.
270 * This function checks if the socket has
271 * timed out yet, given the current time
273 * @return true if timed out, false if not timed out
275 bool Timeout(time_t current);
278 * Writes a std::string to the socket. No carriage
279 * returns or linefeeds are appended to the string.
280 * @param data The data to send
282 virtual int Write(const std::string &data);
285 * If your socket is a listening socket, when a new
286 * connection comes in on the socket this method will
287 * be called. Given the new file descriptor in the
288 * parameters, and the IP, it is recommended you copy
289 * them to a new instance of your socket class,
292 * MySocket* newsocket = new MySocket(newfd,ip);
294 * Once you have done this, you can then associate the
295 * new socket with the core using Server::AddSocket().
297 virtual int OnIncomingConnection(int newfd, char* ip);
300 * Changes the socket's state. The core uses this
301 * to change socket states, and you should not call
304 void SetState(InspSocketState s);
307 * Call this to receive the next write event
308 * that comes along for this fd to the OnWriteReady
314 * Returns the current socket state.
316 InspSocketState GetState();
319 * Only the core should call this function.
320 * When called, it is assumed the socket is ready
321 * to read data, and the method call routes the
322 * event to the various methods of InspSocket
323 * for you to handle. This can also cause the
324 * socket's state to change.
329 * This method returns the socket's file descriptor
330 * as assigned by the operating system, or -1
331 * if no descriptor has been assigned.
336 * This method causes the socket to close, and may
337 * also be triggered by other methods such as OnTimeout
340 virtual void Close();
343 * The destructor may implicitly call OnClose(), and
344 * will close() and shutdown() the file descriptor
345 * used for this socket.
347 virtual ~InspSocket();
350 * This method attempts to connect to a hostname.
351 * This only occurs on a non-listening socket. This
352 * method is asyncronous.
354 virtual bool DoConnect();
357 * This method marks the socket closed.
358 * The next time the core examines a socket marked
359 * as closed, the socket will be closed and the