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;
119 /** Socket output buffer (binary safe)
121 std::deque<std::string> outbuffer;
123 /** The hostname connected to
127 /** The port connected to
132 * The state for this socket, either
133 * listening, connecting, connected
136 BufferedSocketState state;
139 * The IP address being connected
140 * to stored in string form for
141 * easy retrieval by accessors.
146 * Used by accept() to indicate the
147 * sizes of the sockaddr_in structures
151 /** Flushes the write buffer
152 * @returns true if the writing failed, false if it was successful
154 bool FlushWriteBuffer();
156 /** Set the queue sizes
157 * This private method sets the operating system queue
158 * sizes for this socket to 65535 so that it can queue
159 * more information without application-level queueing
160 * which was required in older software.
162 void SetQueues(int nfd);
164 /** When the socket has been marked as closing, this flag
165 * will be set to true, then the next time the socket is
166 * examined, the socket is deleted and closed.
172 * @param ip IP to bind to
173 * @return True is the binding succeeded
175 bool BindAddr(const std::string &ip);
178 * The default constructor does nothing
179 * and should not be used.
181 BufferedSocket(InspIRCd* SI);
184 * This constructor is used to associate
185 * an existing connecting with an BufferedSocket
186 * class. The given file descriptor must be
187 * valid, and when initialized, the BufferedSocket
188 * will be set with the given IP address
189 * and placed in CONNECTED state.
191 BufferedSocket(InspIRCd* SI, int newfd, const char* ip);
194 * This constructor is used to create a new outbound connection to another host.
195 * Note that if you specify a hostname in the 'ipaddr' parameter, this class will not
196 * connect. You must resolve your hostnames before passing them to BufferedSocket. To do so,
197 * you should use the nonblocking class 'Resolver'.
198 * @param ipaddr The IP to connect to, or bind to
199 * @param port The port number to connect to
200 * @param maxtime Number of seconds to wait, if connecting, before the connection times out and an OnTimeout() event is generated
201 * @param connectbindip When creating an outbound connection, the IP to bind the connection to. If not defined, the port is not bound.
202 * @return On exit, GetState() returns I_ERROR if an error occured, and errno can be used to read the socket error.
204 BufferedSocket(InspIRCd* SI, const std::string &ipaddr, int port, unsigned long maxtime, const std::string &connectbindip = "");
207 * This method is called when an outbound
208 * connection on your socket is completed.
209 * @return false to abort the connection, true to continue
211 virtual bool OnConnected();
214 * This method is called when an error occurs.
215 * A closed socket in itself is not an error,
216 * however errors also generate close events.
217 * @param e The error type which occured
219 virtual void OnError(BufferedSocketError e);
222 * When an established connection is terminated,
223 * the OnDisconnect method is triggered.
225 virtual int OnDisconnect();
228 * When there is data waiting to be read on a
229 * socket, the OnDataReady() method is called.
230 * Within this method, you *MUST* call the Read()
231 * method to read any pending data. At its lowest
232 * level, this event is signalled by the core via
233 * the socket engine. If you return false from this
234 * function, the core removes your socket from its
235 * list and erases it from the socket engine, then
236 * calls BufferedSocket::Close() and deletes it.
237 * @return false to close the socket
239 virtual bool OnDataReady();
242 * When it is ok to write to the socket, and a
243 * write event was requested, this method is
246 * Within this method you should call
247 * write() or send() etc, to send data to the
248 * other end of the socket.
250 * Further write events will not be triggered
251 * unless you call WantWrite().
253 * The default behaviour of this method is to
254 * flush the write buffer, respecting the IO
257 * XXX: this used to be virtual, ask us if you need it to be so.
258 * @return false to close the socket
263 * When an outbound connection fails, and the
264 * attempt times out, you will receive this event.
265 * The method will trigger once maxtime seconds are
266 * reached (as given in the constructor) just
267 * before the socket's descriptor is closed.
268 * A failed DNS lookup may cause this event if
269 * the DNS server is not responding, as well as
270 * a failed connect() call, because DNS lookups are
271 * nonblocking as implemented by this class.
273 virtual void OnTimeout();
276 * Whenever close() is called, OnClose() will be
277 * called first. Please note that this means
278 * OnClose will be called alongside OnError(),
279 * OnTimeout(), and Close().
281 virtual void OnClose();
284 * Reads all pending bytes from the socket
285 * into a char* array which can be up to
286 * 16 kilobytes in length.
288 virtual const char* Read();
291 * Returns the IP address associated with
292 * this connection, or an empty string if
293 * no IP address exists.
298 * Writes a std::string to the socket. No carriage
299 * returns or linefeeds are appended to the string.
300 * @param data The data to send
302 virtual void Write(const std::string &data);
305 * Changes the socket's state. The core uses this
306 * to change socket states, and you should not call
309 void SetState(BufferedSocketState s);
312 * Call this to receive the next write event
313 * that comes along for this fd to the OnWriteReady
319 * Returns the current socket state.
321 BufferedSocketState GetState();
324 * Only the core should call this function.
325 * When called, it is assumed the socket is ready
326 * to read data, and the method call routes the
327 * event to the various methods of BufferedSocket
328 * for you to handle. This can also cause the
329 * socket's state to change.
334 * This method causes the socket to close, and may
335 * also be triggered by other methods such as OnTimeout
338 virtual void Close();
341 * The destructor may implicitly call OnClose(), and
342 * will close() and shutdown() the file descriptor
343 * used for this socket.
345 virtual ~BufferedSocket();
348 * This method attempts to connect to a hostname.
349 * This method is asyncronous.
350 * @param maxtime Number of seconds to wait, if connecting, before the connection times out and an OnTimeout() event is generated
352 virtual bool DoConnect(unsigned long maxtime);
354 /** Handle event from EventHandler parent class
356 void HandleEvent(EventType et, int errornum = 0);
358 /** Returns true if this socket is readable