1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2008 InspIRCd Development Team
6 * See: http://www.inspircd.org/wiki/index.php/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
14 #ifndef __INSP_SOCKET_H__
15 #define __INSP_SOCKET_H__
20 * States which a socket may be in
22 enum BufferedSocketState
24 /** Socket disconnected */
26 /** Socket connecting */
28 /** Socket fully connected */
30 /** Socket has an error */
35 * Error types which a socket may exhibit
37 enum BufferedSocketError
39 /** Socket connect timed out */
41 /** Socket could not be created */
43 /** Socket could not connect (refused) */
45 /** Socket could not bind to local port/ip */
47 /** Socket could not reslve host (depreciated) */
49 /** Socket could not write data */
51 /** No more file descriptors left to create socket! */
55 /* Required forward declarations */
59 using irc::sockets::insp_sockaddr;
60 using irc::sockets::insp_inaddr;
61 using irc::sockets::insp_ntoa;
62 using irc::sockets::insp_aton;
64 /** Used to time out socket connections
66 class CoreExport SocketTimeout : public Timer
69 /** BufferedSocket the class is attached to
72 /** Server instance creating the timeout class
74 InspIRCd* ServerInstance;
75 /** File descriptor of class this is attached to
79 /** Create a socket timeout class
80 * @param fd File descriptor of BufferedSocket
81 * @pram Instance server instance to attach to
82 * @param thesock BufferedSocket to attach to
83 * @param secs_from_now Seconds from now to time out
84 * @param now The current time
86 SocketTimeout(int fd, InspIRCd* Instance, BufferedSocket* thesock, long secs_from_now, time_t now) : Timer(secs_from_now, now), sock(thesock), ServerInstance(Instance), sfd(fd) { };
89 virtual void Tick(time_t now);
93 * BufferedSocket is an extendable socket class which modules
94 * can use for TCP socket support. It is fully integrated
95 * into InspIRCds socket loop and attaches its sockets to
96 * the core's instance of the SocketEngine class, meaning
97 * that any sockets you create have the same power and
98 * abilities as a socket created by the core itself.
99 * To use BufferedSocket, you must inherit a class from it,
100 * and use the BufferedSocket constructors to establish connections
103 class CoreExport BufferedSocket : public EventHandler
111 /** Instance we were created by
115 /** Timeout class or NULL
117 SocketTimeout* Timeout;
121 unsigned long timeout_val;
123 /** Socket output buffer (binary safe)
125 std::deque<std::string> outbuffer;
127 /** The hostname connected to
131 /** The port connected to
136 * The state for this socket, either
137 * listening, connecting, connected
140 BufferedSocketState state;
143 * This value is true if the
144 * socket has timed out.
149 * The IP address being connected
150 * to stored in string form for
151 * easy retrieval by accessors.
156 * Used by accept() to indicate the
157 * sizes of the sockaddr_in structures
161 /** Flushes the write buffer
163 bool FlushWriteBuffer();
165 /** Set the queue sizes
166 * This private method sets the operating system queue
167 * sizes for this socket to 65535 so that it can queue
168 * more information without application-level queueing
169 * which was required in older software.
171 void SetQueues(int nfd);
173 /** When the socket has been marked as closing, this flag
174 * will be set to true, then the next time the socket is
175 * examined, the socket is deleted and closed.
179 /** Set to true when we're waiting for a write event.
180 * If this is true and a write event comes in, we
181 * call the write instead of the read method.
183 bool WaitingForWriteEvent;
187 * @param ip IP to bind to
188 * @return True is the binding succeeded
190 bool BindAddr(const std::string &ip);
193 * The default constructor does nothing
194 * and should not be used.
196 BufferedSocket(InspIRCd* SI);
199 * This constructor is used to associate
200 * an existing connecting with an BufferedSocket
201 * class. The given file descriptor must be
202 * valid, and when initialized, the BufferedSocket
203 * will be set with the given IP address
204 * and placed in CONNECTED state.
206 BufferedSocket(InspIRCd* SI, int newfd, const char* ip);
209 * This constructor is used to create a new outbound connection to another host.
210 * Note that if you specify a hostname in the 'ipaddr' parameter, this class will not
211 * connect. You must resolve your hostnames before passing them to BufferedSocket. To do so,
212 * you should use the nonblocking class 'Resolver'.
213 * @param ipaddr The IP to connect to, or bind to
214 * @param port The port number to connect to
215 * @param maxtime Number of seconds to wait, if connecting, before the connection times out and an OnTimeout() event is generated
216 * @param connectbindip When creating an outbound connection, the IP to bind the connection to. If not defined, the port is not bound.
217 * @return On exit, GetState() returns I_ERROR if an error occured, and errno can be used to read the socket error.
219 BufferedSocket(InspIRCd* SI, const std::string &ipaddr, int port, unsigned long maxtime, const std::string &connectbindip = "");
222 * This method is called when an outbound
223 * connection on your socket is completed.
224 * @return false to abort the connection, true to continue
226 virtual bool OnConnected();
229 * This method is called when an error occurs.
230 * A closed socket in itself is not an error,
231 * however errors also generate close events.
232 * @param e The error type which occured
234 virtual void OnError(BufferedSocketError e);
237 * When an established connection is terminated,
238 * the OnDisconnect method is triggered.
240 virtual int OnDisconnect();
243 * When there is data waiting to be read on a
244 * socket, the OnDataReady() method is called.
245 * Within this method, you *MUST* call the Read()
246 * method to read any pending data. At its lowest
247 * level, this event is signalled by the core via
248 * the socket engine. If you return false from this
249 * function, the core removes your socket from its
250 * list and erases it from the socket engine, then
251 * calls BufferedSocket::Close() and deletes it.
252 * @return false to close the socket
254 virtual bool OnDataReady();
257 * When it is ok to write to the socket, and a
258 * write event was requested, this method is
259 * triggered. Within this method you should call
260 * write() or send() etc, to send data to the
261 * other end of the socket. Further write events
262 * will not be triggered unless you call WantWrite().
263 * @return false to close the socket
265 virtual bool OnWriteReady();
268 * When an outbound connection fails, and the
269 * attempt times out, you will receive this event.
270 * The method will trigger once maxtime seconds are
271 * reached (as given in the constructor) just
272 * before the socket's descriptor is closed.
273 * A failed DNS lookup may cause this event if
274 * the DNS server is not responding, as well as
275 * a failed connect() call, because DNS lookups are
276 * nonblocking as implemented by this class.
278 virtual void OnTimeout();
281 * Whenever close() is called, OnClose() will be
282 * called first. Please note that this means
283 * OnClose will be called alongside OnError(),
284 * OnTimeout(), and Close().
286 virtual void OnClose();
289 * Reads all pending bytes from the socket
290 * into a char* array which can be up to
291 * 16 kilobytes in length.
293 virtual const char* Read();
296 * Returns the IP address associated with
297 * this connection, or an empty string if
298 * no IP address exists.
303 * Writes a std::string to the socket. No carriage
304 * returns or linefeeds are appended to the string.
305 * @param data The data to send
307 virtual void Write(const std::string &data);
310 * Changes the socket's state. The core uses this
311 * to change socket states, and you should not call
314 void SetState(BufferedSocketState s);
317 * Call this to receive the next write event
318 * that comes along for this fd to the OnWriteReady
324 * Returns the current socket state.
326 BufferedSocketState GetState();
329 * Only the core should call this function.
330 * When called, it is assumed the socket is ready
331 * to read data, and the method call routes the
332 * event to the various methods of BufferedSocket
333 * for you to handle. This can also cause the
334 * socket's state to change.
339 * This method causes the socket to close, and may
340 * also be triggered by other methods such as OnTimeout
343 virtual void Close();
346 * The destructor may implicitly call OnClose(), and
347 * will close() and shutdown() the file descriptor
348 * used for this socket.
350 virtual ~BufferedSocket();
353 * This method attempts to connect to a hostname.
354 * This method is asyncronous.
356 virtual bool DoConnect();
358 /** Handle event from EventHandler parent class
360 void HandleEvent(EventType et, int errornum = 0);
362 /** Returns true if this socket is readable