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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2007 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#ifndef __INSP_SOCKET_H__
#define __INSP_SOCKET_H__
#include <sstream>
#include <string>
#include <deque>
#include "dns.h"
#include "inspircd_config.h"
#include "socket.h"
#include "inspsocket.h"
#include "timer.h"
/**
* States which a socket may be in
*/
enum InspSocketState
{
/** Socket disconnected */
I_DISCONNECTED,
/** Socket connecting */
I_CONNECTING,
/** Socket fully connected */
I_CONNECTED,
/** Socket listening for connections */
I_LISTENING,
/** Socket has an error */
I_ERROR
};
/**
* Error types which a socket may exhibit
*/
enum InspSocketError
{
/** Socket connect timed out */
I_ERR_TIMEOUT,
/** Socket could not be created */
I_ERR_SOCKET,
/** Socket could not connect (refused) */
I_ERR_CONNECT,
/** Socket could not bind to local port/ip */
I_ERR_BIND,
/** Socket could not reslve host (depreciated) */
I_ERR_RESOLVE,
/** Socket could not write data */
I_ERR_WRITE,
/** No more file descriptors left to create socket! */
I_ERR_NOMOREFDS
};
/* Required forward declarations */
class InspSocket;
class InspIRCd;
using irc::sockets::insp_sockaddr;
using irc::sockets::insp_inaddr;
using irc::sockets::insp_ntoa;
using irc::sockets::insp_aton;
/** Used to time out socket connections
*/
class CoreExport SocketTimeout : public InspTimer
{
private:
/** InspSocket the class is attached to
*/
InspSocket* sock;
/** Server instance creating the timeout class
*/
InspIRCd* ServerInstance;
/** File descriptor of class this is attached to
*/
int sfd;
public:
/** Create a socket timeout class
* @param fd File descriptor of InspSocket
* @pram Instance server instance to attach to
* @param thesock InspSocket to attach to
* @param secs_from_now Seconds from now to time out
* @param now The current time
*/
SocketTimeout(int fd, InspIRCd* Instance, InspSocket* thesock, long secs_from_now, time_t now) : InspTimer(secs_from_now, now), sock(thesock), ServerInstance(Instance), sfd(fd) { };
/** Handle tick event
*/
virtual void Tick(time_t now);
};
/**
* InspSocket is an extendable socket class which modules
* can use for TCP socket support. It is fully integrated
* into InspIRCds socket loop and attaches its sockets to
* the core's instance of the SocketEngine class, meaning
* that any sockets you create have the same power and
* abilities as a socket created by the core itself.
* To use InspSocket, you must inherit a class from it,
* and use the InspSocket constructors to establish connections
* and bindings.
*/
class CoreExport InspSocket : public EventHandler
{
public:
/**
* Bind IP
*/
std::string cbindip;
/**
* Is hooked by a module for low level IO
*/
bool IsIOHooked;
/**
* Instance we were created by
*/
InspIRCd* Instance;
/**
* Timeout class or NULL
*/
SocketTimeout* Timeout;
/**
* Timeout length
*/
unsigned long timeout_val;
/**
* Socket output buffer (binary safe)
*/
std::deque<std::string> outbuffer;
/**
* The hostname connected to
*/
char host[MAXBUF];
/**
* The port connected to, or the port
* this socket is listening on
*/
int port;
/**
* The state for this socket, either
* listening, connecting, connected
* or error.
*/
InspSocketState state;
/**
* This value is true if the
* socket has timed out.
*/
bool timeout;
/**
* Socket input buffer, used by read(). The class which
* extends InspSocket is expected to implement an extendable
* buffer which can grow much larger than 64k,
* this buffer is just designed to be temporary storage.
* space.
*/
char ibuf[65535];
/**
* The IP address being connected
* to stored in string form for
* easy retrieval by accessors.
*/
char IP[MAXBUF];
/**
* Used by accept() to indicate the
* sizes of the sockaddr_in structures
*/
socklen_t length;
/** Flushes the write buffer
*/
bool FlushWriteBuffer();
/** Set the queue sizes
* This private method sets the operating system queue
* sizes for this socket to 65535 so that it can queue
* more information without application-level queueing
* which was required in older software.
*/
void SetQueues(int nfd);
/** When the socket has been marked as closing, this flag
* will be set to true, then the next time the socket is
* examined, the socket is deleted and closed.
*/
bool ClosePending;
/** Set to true when we're waiting for a write event.
* If this is true and a write event comes in, we
* call the write instead of the read method.
*/
bool WaitingForWriteEvent;
/**
* Bind to an address
* @param ip IP to bind to
* @return True is the binding succeeded
*/
bool BindAddr(const std::string &ip);
/**
* The default constructor does nothing
* and should not be used.
*/
InspSocket(InspIRCd* SI);
/**
* This constructor is used to associate
* an existing connecting with an InspSocket
* class. The given file descriptor must be
* valid, and when initialized, the InspSocket
* will be set with the given IP address
* and placed in CONNECTED state.
*/
InspSocket(InspIRCd* SI, int newfd, const char* ip);
/**
* This constructor is used to create a new
* socket, either listening for connections, or an outbound connection to another host.
* Note that if you specify a hostname in the 'ipaddr' parameter, this class will not
* connect. You must resolve your hostnames before passing them to InspSocket. To do so,
* you should use the nonblocking class 'Resolver'.
* @param ipaddr The IP to connect to, or bind to
* @param port The port number to connect to, or bind to
* @param listening true to listen on the given host:port pair, or false to connect to them
* @param maxtime Number of seconds to wait, if connecting, before the connection times out and an OnTimeout() event is generated
* @param connectbindip When creating an outbound connection, the IP to bind the connection to. If not defined, the port is not bound.
* @return On exit, GetState() returns I_ERROR if an error occured, and errno can be used to read the socket error.
*/
InspSocket(InspIRCd* SI, const std::string &ipaddr, int port, bool listening, unsigned long maxtime, const std::string &connectbindip = "");
/**
* This method is called when an outbound
* connection on your socket is completed.
* @return false to abort the connection, true to continue
*/
virtual bool OnConnected();
/**
* This method is called when an error occurs.
* A closed socket in itself is not an error,
* however errors also generate close events.
* @param e The error type which occured
*/
virtual void OnError(InspSocketError e);
/**
* When an established connection is terminated,
* the OnDisconnect method is triggered.
*/
virtual int OnDisconnect();
/**
* When there is data waiting to be read on a
* socket, the OnDataReady() method is called.
* Within this method, you *MUST* call the Read()
* method to read any pending data. At its lowest
* level, this event is signalled by the core via
* the socket engine. If you return false from this
* function, the core removes your socket from its
* list and erases it from the socket engine, then
* calls InspSocket::Close() and deletes it.
* @return false to close the socket
*/
virtual bool OnDataReady();
/**
* When it is ok to write to the socket, and a
* write event was requested, this method is
* triggered. Within this method you should call
* write() or send() etc, to send data to the
* other end of the socket. Further write events
* will not be triggered unless you call WantWrite().
* @return false to close the socket
*/
virtual bool OnWriteReady();
/**
* When an outbound connection fails, and the
* attempt times out, you will receive this event.
* The method will trigger once maxtime seconds are
* reached (as given in the constructor) just
* before the socket's descriptor is closed.
* A failed DNS lookup may cause this event if
* the DNS server is not responding, as well as
* a failed connect() call, because DNS lookups are
* nonblocking as implemented by this class.
*/
virtual void OnTimeout();
/**
* Whenever close() is called, OnClose() will be
* called first. Please note that this means
* OnClose will be called alongside OnError(),
* OnTimeout(), and Close(), and also when
* cancelling a listening socket by calling
* the destructor indirectly.
*/
virtual void OnClose();
/**
* Reads all pending bytes from the socket
* into a char* array which can be up to
* 16 kilobytes in length.
*/
virtual char* Read();
/**
* Returns the IP address associated with
* this connection, or an empty string if
* no IP address exists.
*/
std::string GetIP();
/**
* Writes a std::string to the socket. No carriage
* returns or linefeeds are appended to the string.
* @param data The data to send
*/
virtual int Write(const std::string &data);
/**
* If your socket is a listening socket, when a new
* connection comes in on the socket this method will
* be called. Given the new file descriptor in the
* parameters, and the IP, it is recommended you copy
* them to a new instance of your socket class,
* e.g.:
*
* MySocket* newsocket = new MySocket(newfd,ip);
*
* Once you have done this, you can then associate the
* new socket with the core using Server::AddSocket().
*/
virtual int OnIncomingConnection(int newfd, char* ip);
/**
* Changes the socket's state. The core uses this
* to change socket states, and you should not call
* it directly.
*/
void SetState(InspSocketState s);
/**
* Call this to receive the next write event
* that comes along for this fd to the OnWriteReady
* method.
*/
void WantWrite();
/**
* Returns the current socket state.
*/
InspSocketState GetState();
/**
* Only the core should call this function.
* When called, it is assumed the socket is ready
* to read data, and the method call routes the
* event to the various methods of InspSocket
* for you to handle. This can also cause the
* socket's state to change.
*/
bool Poll();
/**
* This method returns the socket's file descriptor
* as assigned by the operating system, or -1
* if no descriptor has been assigned.
*/
int GetFd();
/**
* This method causes the socket to close, and may
* also be triggered by other methods such as OnTimeout
* and OnError.
*/
virtual void Close();
/**
* The destructor may implicitly call OnClose(), and
* will close() and shutdown() the file descriptor
* used for this socket.
*/
virtual ~InspSocket();
/**
* This method attempts to connect to a hostname.
* This only occurs on a non-listening socket. This
* method is asyncronous.
*/
virtual bool DoConnect();
/**
* This method marks the socket closed.
* The next time the core examines a socket marked
* as closed, the socket will be closed and the
* memory reclaimed.
*
* NOTE: This method is DEPRECIATED and will be
* ignored if called!
*/
void MarkAsClosed();
/** Handle event from EventHandler parent class
*/
void HandleEvent(EventType et, int errornum = 0);
/** Returns true if this socket is readable
*/
bool Readable();
};
#endif
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