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772 lines
23 KiB
772 lines
23 KiB
/*
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* Copyright (C) 2003,2005 Thiago Macieira <thiago.macieira@kdemail.net>
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*
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Even before our #ifdef, clean up the namespace
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*/
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#ifdef socket
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#undef socket
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#endif
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#ifdef bind
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#undef bind
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#endif
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#ifdef listen
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#undef listen
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#endif
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#ifdef connect
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#undef connect
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#endif
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#ifdef accept
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#undef accept
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#endif
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#ifdef getpeername
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#undef getpeername
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#endif
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#ifdef getsockname
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#undef getsockname
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#endif
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#ifndef TDESOCKETBASE_H
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#define TDESOCKETBASE_H
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#include <tqiodevice.h>
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#include <tqstring.h>
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#include "tdesocketaddress.h"
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#include <tdelibs_export.h>
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/*
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* This is extending QIODevice's error codes
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*
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* According to tqiodevice.h, the last error is IO_UnspecifiedError
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* These errors will never occur in functions declared in QIODevice
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* (except open, but you shouldn't call open)
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*/
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#define IO_ListenError (IO_UnspecifiedError+1)
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#define IO_AcceptError (IO_UnspecifiedError+2)
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#define IO_LookupError (IO_UnspecifiedError+3)
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#define IO_SocketCreateError (IO_UnspecifiedError+4)
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#define IO_BindError (IO_UnspecifiedError+5)
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class TQMutex;
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namespace KNetwork {
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class KResolverEntry;
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class TDESocketDevice;
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class TDESocketBasePrivate;
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/** @class TDESocketBase tdesocketbase.h tdesocketbase.h
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* @brief Basic socket functionality.
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*
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* This class provides the basic socket functionlity for descended classes.
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* Socket classes are thread-safe and provide a recursive mutex should it be
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* needed.
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*
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* @note This class is abstract.
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*
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* @author Thiago Macieira <thiago.macieira@kdemail.net>
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*/
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class TDECORE_EXPORT TDESocketBase
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{
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public:
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/**
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* Possible socket options.
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*
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* These are the options that may be set on a socket:
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* - Blocking: whether the socket shall operate in blocking
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* or non-blocking mode. This flag defaults to on.
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* See @ref setBlocking.
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* - AddressReusable: whether the address used by this socket will
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* be available for reuse by other sockets. This flag defaults to off.
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* See @ref setAddressReuseable.
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* - IPv6Only: whether an IPv6 socket will accept IPv4 connections
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* through a mapped address. This flag defaults to off.
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* See @ref setIPv6Only.
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* - KeepAlive: whether TCP should send keepalive probes when a connection
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* has gone idle for far too long.
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* - Broadcast: whether this socket is allowed to send broadcast packets
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* and will receive packets sent to broadcast.
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*/
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enum SocketOptions
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{
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Blocking = 0x01,
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AddressReuseable = 0x02,
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IPv6Only = 0x04,
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Keepalive = 0x08,
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Broadcast = 0x10
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};
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/**
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* Possible socket error codes.
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*
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* This is a list of possible error conditions that socket classes may
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* be expected to find.
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*
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* - NoError: no error has been detected
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* - LookupFailure: if a name lookup has failed
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* - AddressInUse: address is already in use
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* - AlreadyBound: cannot bind again
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* - AlreadyCreated: cannot recreate the socket
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* - NotBound: operation required socket to be bound and it isn't
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* - NotCreated: operation required socket to exist and it doesn't
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* - WouldBlock: requested I/O operation would block
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* - ConnectionRefused: connection actively refused
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* - ConnectionTimedOut: connection timed out
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* - InProgress: operation (connection) is already in progress
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* - NetFailure: a network failure occurred (no route, host down, host unreachable or similar)
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* - NotSupported: requested operation is not supported
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* - Timeout: a timed operation timed out
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* - UnknownError: an unknown/unexpected error has happened
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* - RemotelyDisconnected: when a connection is disconnected by the other end (since 3.4)
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*
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* @sa error, errorString
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*/
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enum SocketError
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{
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NoError = 0,
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LookupFailure,
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AddressInUse,
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AlreadyCreated,
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AlreadyBound,
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AlreadyConnected,
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NotConnected,
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NotBound,
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NotCreated,
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WouldBlock,
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ConnectionRefused,
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ConnectionTimedOut,
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InProgress,
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NetFailure,
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NotSupported,
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Timeout,
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UnknownError,
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RemotelyDisconnected
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};
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public:
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/**
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* Default constructor.
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*/
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TDESocketBase();
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/**
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* Destructor.
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*/
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virtual ~TDESocketBase();
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/*
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* The following functions are shared by all descended classes and will have
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* to be reimplemented.
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*/
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protected:
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/**
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* Set the given socket options.
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*
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* The default implementation does nothing but store the mask internally.
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* Descended classes must override this function to achieve functionality and
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* must also call this implementation.
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*
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* @param opts a mask of @ref SocketOptions or-ed bits of options to set
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* or unset
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* @returns true on success
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* @note this function sets the options corresponding to the bits enabled in @p opts
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* but will also unset the optiosn corresponding to the bits not set.
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*/
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virtual bool setSocketOptions(int opts);
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/**
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* Retrieves the socket options that have been set.
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*
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* The default implementation just retrieves the mask from an internal variable.
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* Descended classes may choose to override this function to read the values
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* from the operating system.
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*
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* @returns the mask of the options set
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*/
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virtual int socketOptions() const;
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public:
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/**
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* Sets this socket's blocking mode.
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*
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* In blocking operation, all I/O functions are susceptible to blocking --
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* i.e., will not return unless the I/O can be satisfied. In non-blocking
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* operation, if the I/O would block, the function will return an error
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* and set the corresponding error code.
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*
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* The default implementation toggles the Blocking flag with the current
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* socket options and calls @ref setSocketOptions.
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*
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* @param enable whether to set this socket to blocking mode
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* @returns whether setting this value was successful; it is NOT the
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* final blocking mode.
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*/
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virtual bool setBlocking(bool enable);
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/**
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* Retrieves this socket's blocking mode.
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*
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* @returns true if this socket is/will be operated in blocking mode,
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* false if non-blocking.
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*/
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bool blocking() const;
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/**
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* Sets this socket's address reuseable flag.
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*
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* When the address reuseable flag is active, the address used by
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* this socket is left reuseable for other sockets to bind. If
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* the flag is not active, no other sockets may reuse the same
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* address.
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*
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* The default implementation toggles the AddressReuseable flag with the current
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* socket options and calls @ref setSocketOptions.
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*
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* @param enable whether to set the flag on or off
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* @returns true if setting this flag was successful
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*/
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virtual bool setAddressReuseable(bool enable);
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/**
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* Retrieves this socket's address reuseability flag.
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*
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* @returns true if this socket's address can be reused,
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* false if it can't.
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*/
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bool addressReuseable() const;
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/**
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* Sets this socket's IPv6 Only flag.
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*
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* When this flag is on, an IPv6 socket will only accept, connect, send to or
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* receive from IPv6 addresses. When it is off, it will also talk to
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* IPv4 addresses through v4-mapped addresses.
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*
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* This option has no effect on non-IPv6 sockets.
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*
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* The default implementation toggles the IPv6Only flag with the current
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* socket options and calls @ref setSocketOptions.
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*
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* @param enable whether to set the flag on or off
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* @returns true if setting this flag was successful
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*/
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virtual bool setIPv6Only(bool enable);
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/**
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* Retrieves this socket's IPv6 Only flag.
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*
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* @returns true if this socket will ignore IPv4-compatible and IPv4-mapped
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* addresses, false if it will accept them.
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*/
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bool isIPv6Only() const;
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/**
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* Sets this socket Broadcast flag.
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*
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* Datagram-oriented sockets cannot normally send packets to broadcast
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* addresses, nor will they receive packets that were sent to a broadcast
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* address. To do so, you need to enable the Broadcast flag.
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*
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* This option has no effect on stream-oriented sockets.
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*
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* @returns true if setting this flag was successful.
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*/
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virtual bool setBroadcast(bool enable);
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/**
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* Retrieves this socket's Broadcast flag.
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*
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* @returns true if this socket can send and receive broadcast packets,
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* false if it can't.
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*/
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bool broadcast() const;
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/**
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* Retrieves the socket implementation used on this socket.
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*
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* This function creates the device if none has been set
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* using the default factory.
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*/
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TDESocketDevice* socketDevice() const;
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/**
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* Sets the socket implementation to be used on this socket.
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*
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* Note: it is an error to set this if the socket device has
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* already been set once.
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*
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* This function is provided virtual so that derived classes can catch
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* the setting of a device and properly set their own states and internal
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* variables. The parent class must be called.
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*
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* This function is called by @ref socketDevice above when the socket is
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* first created.
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*/
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virtual void setSocketDevice(TDESocketDevice* device);
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/**
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* Sets the internally requested capabilities for a socket device.
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*
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* Most socket classes can use any back-end implementation. However, a few
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* may require specific capabilities not provided in the default
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* implementation. By using this function, derived classes can request
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* that a backend with those capabilities be created when necessary.
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*
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* For the possible flags, see @ref TDESocketDevice::Capabilities. However, note
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* that only the Can* flags make sense in this context.
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*
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* @note Since socketDevice must always return a valid backend object, it
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* is is possible that the created device does not conform to all
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* requirements requested. Implementations sensitive to this fact
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* should test the object returned by @ref socketDevice (through
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* @ref TDESocketDevice::capabilities, for instance) the availability.
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*
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* @param add mask of @ref TDESocketDevice::Capabilities to add
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* @param remove mask of bits to remove from the requirements
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* @return the current mask of requested capabilities
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*/
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int setRequestedCapabilities(int add, int remove = 0);
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protected:
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/**
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* Returns true if the socket device has been initialised in this
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* object, either by calling @ref socketDevice() or @ref setSocketDevice
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*/
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bool hasDevice() const;
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/**
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* Sets the socket's error code.
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*
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* @param error the error code
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*/
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void setError(SocketError error);
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public:
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/**
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* Retrieves the socket error code.
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* @sa errorString
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*/
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SocketError error() const;
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/**
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* Returns the error string corresponding to this error condition.
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*/
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inline TQString errorString() const
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{ return errorString(error()); }
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/**
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* Returns the internal mutex for this class.
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*
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* Note on multithreaded use of sockets:
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* the socket classes are thread-safe by design, but you should be aware of
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* problems regarding socket creation, connection and destruction in
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* multi-threaded programs. The classes are guaranteed to work while
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* the socket exists, but it's not wise to call connect in multiple
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* threads.
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*
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* Also, this mutex must be unlocked before the object is destroyed, which
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* means you cannot use it to guard against other threads accessing the object
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* while destroying it. You must ensure there are no further references to this
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* object when deleting it.
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*/
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TQMutex* mutex() const;
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public:
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/**
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* Returns the string describing the given error code, i18n'ed.
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*
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* @param code the error code
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*/
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static TQString errorString(SocketError code);
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/**
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* Returns true if the given error code is a fatal one, false
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* otherwise. The parameter here is of type int so that
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* casting isn't necessary when using the parameter to signal
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* QClientSocketBase::gotError.
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*
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* @param code the code to test
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*/
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static bool isFatalError(int code);
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private:
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/// @internal
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/// called by TDESocketDevice
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void unsetSocketDevice();
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TDESocketBase(const TDESocketBase&);
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TDESocketBase& operator =(const TDESocketBase&);
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TDESocketBasePrivate *d;
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friend class TDESocketDevice;
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};
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/**
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* @class KActiveSocketBase tdesocketbase.h tdesocketbase.h
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* @brief Abstract class for active sockets
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*
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* This class provides the standard interfaces for active sockets, i.e.,
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* sockets that are used to connect to external addresses.
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*
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* @author Thiago Macieira <thiago.macieira@kdemail.net>
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*/
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class TDECORE_EXPORT KActiveSocketBase: public TQIODevice, virtual public TDESocketBase
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{
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public:
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/**
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* Constructor.
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*/
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KActiveSocketBase();
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/**
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* Destructor.
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*/
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virtual ~KActiveSocketBase();
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/**
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* Binds this socket to the given address.
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*
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* The socket will be constructed with the address family,
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* socket type and protocol as those given in the
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* @p address object.
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*
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* @param address the address to bind to
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* @returns true if the binding was successful, false otherwise
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*/
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virtual bool bind(const KResolverEntry& address) = 0;
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/**
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* Connect to a remote host.
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*
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* This will make this socket try to connect to the remote host.
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* If the socket is not yet created, it will be created using the
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* address family, socket type and protocol specified in the
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* @p address object.
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*
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* If this function returns with error InProgress, calling it
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* again with the same address after a time will cause it to test
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* if the connection has succeeded in the mean time.
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*
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* @param address the address to connect to
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* @returns true if the connection was successful or has been successfully
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* queued; false if an error occurred.
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*/
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virtual bool connect(const KResolverEntry& address) = 0;
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/**
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* Disconnects this socket from a connection, if possible.
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*
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* If this socket was connected to an endpoint, the connection
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* is severed, but the socket is not closed. If the socket wasn't
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* connected, this function does nothing.
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*
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* If the socket hadn't yet been created, this function does nothing
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* either.
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*
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* Not all socket types can disconnect. Most notably, only
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* connectionless datagram protocols such as UDP support this operation.
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*
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* @return true if the socket is now disconnected or false on error.
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*/
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virtual bool disconnect() = 0;
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/**
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* This call is not supported on sockets. Reimplemented from TQIODevice.
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* This will always return 0.
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*/
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#ifdef USE_QT4
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virtual qint64 size() const
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#else // USE_QT4
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virtual Offset size() const
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#endif // USE_QT4
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{ return 0; }
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/**
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* This call is not supported on sockets. Reimplemented from TQIODevice.
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* This will always return 0.
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*/
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virtual Offset at() const
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{ return 0; }
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/**
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* This call is not supported on sockets. Reimplemented from TQIODevice.
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* This will always return false.
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*/
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virtual bool at(Offset)
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{ return false; }
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/**
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* This call is not supported on sockets. Reimplemented from TQIODevice.
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* This will always return true.
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*/
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virtual bool atEnd() const
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{ return true; }
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/**
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* Returns the number of bytes available for reading without
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* blocking.
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*/
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#ifdef USE_QT3
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virtual TQ_LONG bytesAvailable() const = 0;
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#endif
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#ifdef USE_QT4
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virtual qint64 bytesAvailable() const = 0;
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#endif
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/**
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* Waits up to @p msecs for more data to be available on this socket.
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*
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* If msecs is -1, this call will block indefinetely until more data
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* is indeed available; if it's 0, this function returns immediately.
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*
|
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* If @p timeout is not NULL, this function will set it to indicate
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* if a timeout occurred.
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*
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* @returns the number of bytes available
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*/
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virtual TQ_LONG waitForMore(int msecs, bool *timeout = 0L) = 0;
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|
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/**
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* Reads data from the socket.
|
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*
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* Reimplemented from TQIODevice. See TQIODevice::readBlock for
|
|
* more information.
|
|
*/
|
|
virtual TQT_TQIO_LONG tqreadBlock(char *data, TQT_TQIO_ULONG len) = 0;
|
|
|
|
/** @overload
|
|
* Receives data and the source address.
|
|
*
|
|
* This call will read data in the socket and will also
|
|
* place the sender's address in @p from object.
|
|
*
|
|
* @param data where to write the read data to
|
|
* @param maxlen the maximum number of bytes to read
|
|
* @param from the address of the sender will be stored here
|
|
* @returns the actual number of bytes read
|
|
*/
|
|
virtual TQT_TQIO_LONG tqreadBlock(char *data, TQT_TQIO_ULONG maxlen, TDESocketAddress& from) = 0;
|
|
|
|
/**
|
|
* Peeks the data in the socket.
|
|
*
|
|
* This call will allow you to peek the data to be received without actually
|
|
* receiving it -- that is, it will be available for further peekings and
|
|
* for the next read call.
|
|
*
|
|
* @param data where to write the peeked data to
|
|
* @param maxlen the maximum number of bytes to peek
|
|
* @returns the actual number of bytes copied into @p data
|
|
*/
|
|
virtual TQ_LONG peekBlock(char *data, TQ_ULONG maxlen) = 0;
|
|
|
|
/** @overload
|
|
* Peeks the data in the socket and the source address.
|
|
*
|
|
* This call will allow you to peek the data to be received without actually
|
|
* receiving it -- that is, it will be available for further peekings and
|
|
* for the next read call.
|
|
*
|
|
* @param data where to write the peeked data to
|
|
* @param maxlen the maximum number of bytes to peek
|
|
* @param from the address of the sender will be stored here
|
|
* @returns the actual number of bytes copied into @p data
|
|
*/
|
|
virtual TQ_LONG peekBlock(char *data, TQ_ULONG maxlen, TDESocketAddress& from) = 0;
|
|
|
|
/**
|
|
* Writes the given data to the socket.
|
|
*
|
|
* Reimplemented from TQIODevice. See TQIODevice::writeBlock for
|
|
* more information.
|
|
*/
|
|
virtual TQT_TQIO_LONG tqwriteBlock(const char *data, TQT_TQIO_ULONG len) = 0;
|
|
|
|
/** @overload
|
|
* Writes the given data to the destination address.
|
|
*
|
|
* Note that not all socket connections allow sending data to different
|
|
* addresses than the one the socket is connected to.
|
|
*
|
|
* @param data the data to write
|
|
* @param len the length of the data
|
|
* @param to the address to send to
|
|
* @returns the number of bytes actually sent
|
|
*/
|
|
virtual TQT_TQIO_LONG tqwriteBlock(const char *data, TQT_TQIO_ULONG len, const TDESocketAddress& to) = 0;
|
|
|
|
/**
|
|
* Reads one character from the socket.
|
|
* Reimplementation from TQIODevice. See TQIODevice::getch for more information.
|
|
*/
|
|
virtual int getch();
|
|
|
|
/**
|
|
* Writes one character to the socket.
|
|
* Reimplementation from TQIODevice. See TQIODevice::putch for more information.
|
|
*/
|
|
virtual int putch(int ch);
|
|
|
|
/**
|
|
* This call is not supported on sockets. Reimplemented from TQIODevice.
|
|
* This will always return -1;
|
|
*/
|
|
virtual int ungetch(int)
|
|
{ return -1; }
|
|
|
|
/**
|
|
* Returns this socket's local address.
|
|
*/
|
|
virtual TDESocketAddress localAddress() const = 0;
|
|
|
|
/**
|
|
* Return this socket's peer address, if we are connected.
|
|
* If the address cannot be retrieved, the returned object will contain
|
|
* an invalid address.
|
|
*/
|
|
virtual TDESocketAddress peerAddress() const = 0;
|
|
|
|
// FIXME KDE 4.0:
|
|
// enable this function
|
|
#if 0
|
|
/**
|
|
* Returns this socket's externally-visible address, if known.
|
|
*/
|
|
virtual TDESocketAddress externalAddress() const = 0;
|
|
#endif
|
|
|
|
protected:
|
|
/**
|
|
* Sets the socket's error code and the I/O Device's status.
|
|
*
|
|
* @param status the I/O Device status
|
|
* @param error the error code
|
|
*/
|
|
void setError(int status, SocketError error);
|
|
|
|
/**
|
|
* Resets the socket error code and the I/O Device's status.
|
|
*/
|
|
void resetError();
|
|
};
|
|
|
|
/**
|
|
* @class KPassiveSocketBase tdesocketbase.h tdesocketbase.h
|
|
* @brief Abstract base class for passive sockets.
|
|
*
|
|
* This socket provides the initial functionality for passive sockets,
|
|
* i.e., sockets that accept incoming connections.
|
|
*
|
|
* @author Thiago Macieira <thiago.macieira@kdemail.net>
|
|
*/
|
|
class TDECORE_EXPORT KPassiveSocketBase: virtual public TDESocketBase
|
|
{
|
|
public:
|
|
/**
|
|
* Constructor
|
|
*/
|
|
KPassiveSocketBase();
|
|
|
|
/**
|
|
* Destructor
|
|
*/
|
|
virtual ~KPassiveSocketBase();
|
|
|
|
/**
|
|
* Binds this socket to the given address.
|
|
*
|
|
* The socket will be constructed with the address family,
|
|
* socket type and protocol as those given in the
|
|
* @p address object.
|
|
*
|
|
* @param address the address to bind to
|
|
* @returns true if the binding was successful, false otherwise
|
|
*/
|
|
virtual bool bind(const KResolverEntry& address) = 0;
|
|
|
|
/**
|
|
* Puts this socket into listening mode.
|
|
*
|
|
* Placing a socket in listening mode means that it will
|
|
* be allowed to receive incoming connections from
|
|
* remote hosts.
|
|
*
|
|
* Note that some socket types or protocols cannot be
|
|
* put in listening mode.
|
|
*
|
|
* @param backlog the number of accepted connections to
|
|
* hold before starting to refuse
|
|
* @returns true if the socket is now in listening mode
|
|
*/
|
|
virtual bool listen(int backlog) = 0;
|
|
|
|
/**
|
|
* Closes this socket. All resources used are freed. Note that closing
|
|
* a passive socket does not close the connections accepted with it.
|
|
*/
|
|
virtual void close() = 0;
|
|
|
|
/**
|
|
* Accepts a new incoming connection.
|
|
*
|
|
* If this socket was in listening mode, you can call this
|
|
* function to accept an incoming connection.
|
|
*
|
|
* If this function cannot accept a new connection (either
|
|
* because it is not listening for one or because the operation
|
|
* would block), it will return NULL.
|
|
*
|
|
* Also note that descended classes will override this function
|
|
* to return specialised socket classes.
|
|
*/
|
|
virtual KActiveSocketBase* accept() = 0;
|
|
|
|
/**
|
|
* Returns this socket's local address.
|
|
*/
|
|
virtual TDESocketAddress localAddress() const = 0;
|
|
|
|
/**
|
|
* Returns this socket's externally-visible address if known.
|
|
*/
|
|
virtual TDESocketAddress externalAddress() const = 0;
|
|
|
|
private:
|
|
KPassiveSocketBase(const KPassiveSocketBase&);
|
|
KPassiveSocketBase& operator = (const KPassiveSocketBase&);
|
|
};
|
|
|
|
} // namespace KNetwork
|
|
|
|
#endif
|