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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2012-01-30 20:18:15 -0600
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2012-01-30 20:18:15 -0600
commit255918c59ce22a1523436e8a9b703c54e753106f (patch)
tree42037c692227e57be17c87e0c1ea898e15169127 /tdecore/network/tdesocketbase.h
parentee0c55320dd17dd6cbef85a9bbaa00259ee7eb9a (diff)
downloadtdelibs-255918c59ce22a1523436e8a9b703c54e753106f.tar.gz
tdelibs-255918c59ce22a1523436e8a9b703c54e753106f.zip
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+/* -*- C++ -*-
+ * Copyright (C) 2003,2005 Thiago Macieira <thiago.macieira@kdemail.net>
+ *
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Even before our #ifdef, clean up the namespace
+ */
+#ifdef socket
+#undef socket
+#endif
+
+#ifdef bind
+#undef bind
+#endif
+
+#ifdef listen
+#undef listen
+#endif
+
+#ifdef connect
+#undef connect
+#endif
+
+#ifdef accept
+#undef accept
+#endif
+
+#ifdef getpeername
+#undef getpeername
+#endif
+
+#ifdef getsockname
+#undef getsockname
+#endif
+
+#ifndef TDESOCKETBASE_H
+#define TDESOCKETBASE_H
+
+#include <tqiodevice.h>
+#include <tqstring.h>
+
+#include "tdesocketaddress.h"
+#include <tdelibs_export.h>
+
+/*
+ * This is extending QIODevice's error codes
+ *
+ * According to tqiodevice.h, the last error is IO_UnspecifiedError
+ * These errors will never occur in functions declared in QIODevice
+ * (except open, but you shouldn't call open)
+ */
+#define IO_ListenError (IO_UnspecifiedError+1)
+#define IO_AcceptError (IO_UnspecifiedError+2)
+#define IO_LookupError (IO_UnspecifiedError+3)
+#define IO_SocketCreateError (IO_UnspecifiedError+4)
+#define IO_BindError (IO_UnspecifiedError+5)
+
+class TQMutex;
+
+namespace KNetwork {
+
+class KResolverEntry;
+class KSocketDevice;
+
+class KSocketBasePrivate;
+/** @class KSocketBase tdesocketbase.h tdesocketbase.h
+ * @brief Basic socket functionality.
+ *
+ * This class provides the basic socket functionlity for descended classes.
+ * Socket classes are thread-safe and provide a recursive mutex should it be
+ * needed.
+ *
+ * @note This class is abstract.
+ *
+ * @author Thiago Macieira <thiago.macieira@kdemail.net>
+ */
+class TDECORE_EXPORT KSocketBase
+{
+public:
+ /**
+ * Possible socket options.
+ *
+ * These are the options that may be set on a socket:
+ * - Blocking: whether the socket shall operate in blocking
+ * or non-blocking mode. This flag defaults to on.
+ * See @ref setBlocking.
+ * - AddressReusable: whether the address used by this socket will
+ * be available for reuse by other sockets. This flag defaults to off.
+ * See @ref setAddressReuseable.
+ * - IPv6Only: whether an IPv6 socket will accept IPv4 connections
+ * through a mapped address. This flag defaults to off.
+ * See @ref setIPv6Only.
+ * - KeepAlive: whether TCP should send keepalive probes when a connection
+ * has gone idle for far too long.
+ * - Broadcast: whether this socket is allowed to send broadcast packets
+ * and will receive packets sent to broadcast.
+ */
+ enum SocketOptions
+ {
+ Blocking = 0x01,
+ AddressReuseable = 0x02,
+ IPv6Only = 0x04,
+ Keepalive = 0x08,
+ Broadcast = 0x10
+ };
+
+ /**
+ * Possible socket error codes.
+ *
+ * This is a list of possible error conditions that socket classes may
+ * be expected to find.
+ *
+ * - NoError: no error has been detected
+ * - LookupFailure: if a name lookup has failed
+ * - AddressInUse: address is already in use
+ * - AlreadyBound: cannot bind again
+ * - AlreadyCreated: cannot recreate the socket
+ * - NotBound: operation required socket to be bound and it isn't
+ * - NotCreated: operation required socket to exist and it doesn't
+ * - WouldBlock: requested I/O operation would block
+ * - ConnectionRefused: connection actively refused
+ * - ConnectionTimedOut: connection timed out
+ * - InProgress: operation (connection) is already in progress
+ * - NetFailure: a network failure occurred (no route, host down, host unreachable or similar)
+ * - NotSupported: requested operation is not supported
+ * - Timeout: a timed operation timed out
+ * - UnknownError: an unknown/unexpected error has happened
+ * - RemotelyDisconnected: when a connection is disconnected by the other end (since 3.4)
+ *
+ * @sa error, errorString
+ */
+ enum SocketError
+ {
+ NoError = 0,
+ LookupFailure,
+ AddressInUse,
+ AlreadyCreated,
+ AlreadyBound,
+ AlreadyConnected,
+ NotConnected,
+ NotBound,
+ NotCreated,
+ WouldBlock,
+ ConnectionRefused,
+ ConnectionTimedOut,
+ InProgress,
+ NetFailure,
+ NotSupported,
+ Timeout,
+ UnknownError,
+ RemotelyDisconnected
+ };
+
+public:
+ /**
+ * Default constructor.
+ */
+ KSocketBase();
+
+ /**
+ * Destructor.
+ */
+ virtual ~KSocketBase();
+
+ /*
+ * The following functions are shared by all descended classes and will have
+ * to be reimplemented.
+ */
+
+protected:
+ /**
+ * Set the given socket options.
+ *
+ * The default implementation does nothing but store the mask internally.
+ * Descended classes must override this function to achieve functionality and
+ * must also call this implementation.
+ *
+ * @param opts a mask of @ref SocketOptions or-ed bits of options to set
+ * or unset
+ * @returns true on success
+ * @note this function sets the options corresponding to the bits enabled in @p opts
+ * but will also unset the optiosn corresponding to the bits not set.
+ */
+ virtual bool setSocketOptions(int opts);
+
+ /**
+ * Retrieves the socket options that have been set.
+ *
+ * The default implementation just retrieves the mask from an internal variable.
+ * Descended classes may choose to override this function to read the values
+ * from the operating system.
+ *
+ * @returns the mask of the options set
+ */
+ virtual int socketOptions() const;
+
+public:
+ /**
+ * Sets this socket's blocking mode.
+ *
+ * In blocking operation, all I/O functions are susceptible to blocking --
+ * i.e., will not return unless the I/O can be satisfied. In non-blocking
+ * operation, if the I/O would block, the function will return an error
+ * and set the corresponding error code.
+ *
+ * The default implementation toggles the Blocking flag with the current
+ * socket options and calls @ref setSocketOptions.
+ *
+ * @param enable whether to set this socket to blocking mode
+ * @returns whether setting this value was successful; it is NOT the
+ * final blocking mode.
+ */
+ virtual bool setBlocking(bool enable);
+
+ /**
+ * Retrieves this socket's blocking mode.
+ *
+ * @returns true if this socket is/will be operated in blocking mode,
+ * false if non-blocking.
+ */
+ bool blocking() const;
+
+ /**
+ * Sets this socket's address reuseable flag.
+ *
+ * When the address reuseable flag is active, the address used by
+ * this socket is left reuseable for other sockets to bind. If
+ * the flag is not active, no other sockets may reuse the same
+ * address.
+ *
+ * The default implementation toggles the AddressReuseable flag with the current
+ * socket options and calls @ref setSocketOptions.
+ *
+ * @param enable whether to set the flag on or off
+ * @returns true if setting this flag was successful
+ */
+ virtual bool setAddressReuseable(bool enable);
+
+ /**
+ * Retrieves this socket's address reuseability flag.
+ *
+ * @returns true if this socket's address can be reused,
+ * false if it can't.
+ */
+ bool addressReuseable() const;
+
+ /**
+ * Sets this socket's IPv6 Only flag.
+ *
+ * When this flag is on, an IPv6 socket will only accept, connect, send to or
+ * receive from IPv6 addresses. When it is off, it will also talk to
+ * IPv4 addresses through v4-mapped addresses.
+ *
+ * This option has no effect on non-IPv6 sockets.
+ *
+ * The default implementation toggles the IPv6Only flag with the current
+ * socket options and calls @ref setSocketOptions.
+ *
+ * @param enable whether to set the flag on or off
+ * @returns true if setting this flag was successful
+ */
+ virtual bool setIPv6Only(bool enable);
+
+ /**
+ * Retrieves this socket's IPv6 Only flag.
+ *
+ * @returns true if this socket will ignore IPv4-compatible and IPv4-mapped
+ * addresses, false if it will accept them.
+ */
+ bool isIPv6Only() const;
+
+ /**
+ * Sets this socket Broadcast flag.
+ *
+ * Datagram-oriented sockets cannot normally send packets to broadcast
+ * addresses, nor will they receive packets that were sent to a broadcast
+ * address. To do so, you need to enable the Broadcast flag.
+ *
+ * This option has no effect on stream-oriented sockets.
+ *
+ * @returns true if setting this flag was successful.
+ */
+ virtual bool setBroadcast(bool enable);
+
+ /**
+ * Retrieves this socket's Broadcast flag.
+ *
+ * @returns true if this socket can send and receive broadcast packets,
+ * false if it can't.
+ */
+ bool broadcast() const;
+
+ /**
+ * Retrieves the socket implementation used on this socket.
+ *
+ * This function creates the device if none has been set
+ * using the default factory.
+ */
+ KSocketDevice* socketDevice() const;
+
+ /**
+ * Sets the socket implementation to be used on this socket.
+ *
+ * Note: it is an error to set this if the socket device has
+ * already been set once.
+ *
+ * This function is provided virtual so that derived classes can catch
+ * the setting of a device and properly set their own states and internal
+ * variables. The parent class must be called.
+ *
+ * This function is called by @ref socketDevice above when the socket is
+ * first created.
+ */
+ virtual void setSocketDevice(KSocketDevice* device);
+
+ /**
+ * Sets the internally requested capabilities for a socket device.
+ *
+ * Most socket classes can use any back-end implementation. However, a few
+ * may require specific capabilities not provided in the default
+ * implementation. By using this function, derived classes can request
+ * that a backend with those capabilities be created when necessary.
+ *
+ * For the possible flags, see @ref KSocketDevice::Capabilities. However, note
+ * that only the Can* flags make sense in this context.
+ *
+ * @note Since socketDevice must always return a valid backend object, it
+ * is is possible that the created device does not conform to all
+ * requirements requested. Implementations sensitive to this fact
+ * should test the object returned by @ref socketDevice (through
+ * @ref KSocketDevice::capabilities, for instance) the availability.
+ *
+ * @param add mask of @ref KSocketDevice::Capabilities to add
+ * @param remove mask of bits to remove from the requirements
+ * @return the current mask of requested capabilities
+ */
+ int setRequestedCapabilities(int add, int remove = 0);
+
+protected:
+ /**
+ * Returns true if the socket device has been initialised in this
+ * object, either by calling @ref socketDevice() or @ref setSocketDevice
+ */
+ bool hasDevice() const;
+
+ /**
+ * Sets the socket's error code.
+ *
+ * @param error the error code
+ */
+ void setError(SocketError error);
+
+public:
+ /**
+ * Retrieves the socket error code.
+ * @sa errorString
+ */
+ SocketError error() const;
+
+ /**
+ * Returns the error string corresponding to this error condition.
+ */
+ inline TQString errorString() const
+ { return errorString(error()); }
+
+ /**
+ * Returns the internal mutex for this class.
+ *
+ * Note on multithreaded use of sockets:
+ * the socket classes are thread-safe by design, but you should be aware of
+ * problems regarding socket creation, connection and destruction in
+ * multi-threaded programs. The classes are guaranteed to work while
+ * the socket exists, but it's not wise to call connect in multiple
+ * threads.
+ *
+ * Also, this mutex must be unlocked before the object is destroyed, which
+ * means you cannot use it to guard against other threads accessing the object
+ * while destroying it. You must ensure there are no further references to this
+ * object when deleting it.
+ */
+ TQMutex* mutex() const;
+
+public:
+ /**
+ * Returns the string describing the given error code, i18n'ed.
+ *
+ * @param code the error code
+ */
+ static TQString errorString(SocketError code);
+
+ /**
+ * Returns true if the given error code is a fatal one, false
+ * otherwise. The parameter here is of type int so that
+ * casting isn't necessary when using the parameter to signal
+ * QClientSocketBase::gotError.
+ *
+ * @param code the code to test
+ */
+ static bool isFatalError(int code);
+
+private:
+ /// @internal
+ /// called by KSocketDevice
+ void unsetSocketDevice();
+
+ KSocketBase(const KSocketBase&);
+ KSocketBase& operator =(const KSocketBase&);
+
+ KSocketBasePrivate *d;
+
+ friend class KSocketDevice;
+};
+
+/**
+ * @class KActiveSocketBase tdesocketbase.h tdesocketbase.h
+ * @brief Abstract class for active sockets
+ *
+ * This class provides the standard interfaces for active sockets, i.e.,
+ * sockets that are used to connect to external addresses.
+ *
+ * @author Thiago Macieira <thiago.macieira@kdemail.net>
+ */
+class TDECORE_EXPORT KActiveSocketBase: public TQIODevice, virtual public KSocketBase
+{
+public:
+ /**
+ * Constructor.
+ */
+ KActiveSocketBase();
+
+ /**
+ * Destructor.
+ */
+ virtual ~KActiveSocketBase();
+
+ /**
+ * 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;
+
+ /**
+ * Connect to a remote host.
+ *
+ * This will make this socket try to connect to the remote host.
+ * If the socket is not yet created, it will be created using the
+ * address family, socket type and protocol specified in the
+ * @p address object.
+ *
+ * If this function returns with error InProgress, calling it
+ * again with the same address after a time will cause it to test
+ * if the connection has succeeded in the mean time.
+ *
+ * @param address the address to connect to
+ * @returns true if the connection was successful or has been successfully
+ * queued; false if an error occurred.
+ */
+ virtual bool connect(const KResolverEntry& address) = 0;
+
+ /**
+ * Disconnects this socket from a connection, if possible.
+ *
+ * If this socket was connected to an endpoint, the connection
+ * is severed, but the socket is not closed. If the socket wasn't
+ * connected, this function does nothing.
+ *
+ * If the socket hadn't yet been created, this function does nothing
+ * either.
+ *
+ * Not all socket types can disconnect. Most notably, only
+ * connectionless datagram protocols such as UDP support this operation.
+ *
+ * @return true if the socket is now disconnected or false on error.
+ */
+ virtual bool disconnect() = 0;
+
+ /**
+ * This call is not supported on sockets. Reimplemented from TQIODevice.
+ * This will always return 0.
+ */
+#ifdef USE_QT4
+ virtual qint64 size() const
+#else // USE_QT4
+ virtual Offset size() const
+#endif // USE_QT4
+ { return 0; }
+
+ /**
+ * This call is not supported on sockets. Reimplemented from TQIODevice.
+ * This will always return 0.
+ */
+ virtual Offset at() const
+ { return 0; }
+
+ /**
+ * This call is not supported on sockets. Reimplemented from TQIODevice.
+ * This will always return false.
+ */
+ virtual bool at(Offset)
+ { return false; }
+
+ /**
+ * This call is not supported on sockets. Reimplemented from TQIODevice.
+ * This will always return true.
+ */
+ virtual bool atEnd() const
+ { return true; }
+
+ /**
+ * Returns the number of bytes available for reading without
+ * blocking.
+ */
+#ifdef USE_QT3
+ virtual TQ_LONG bytesAvailable() const = 0;
+#endif
+#ifdef USE_QT4
+ virtual qint64 bytesAvailable() const = 0;
+#endif
+
+ /**
+ * Waits up to @p msecs for more data to be available on this socket.
+ *
+ * If msecs is -1, this call will block indefinetely until more data
+ * is indeed available; if it's 0, this function returns immediately.
+ *
+ * If @p timeout is not NULL, this function will set it to indicate
+ * if a timeout occurred.
+ *
+ * @returns the number of bytes available
+ */
+ virtual TQ_LONG waitForMore(int msecs, bool *timeout = 0L) = 0;
+
+ /**
+ * Reads data from the socket.
+ *
+ * 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, KSocketAddress& 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, KSocketAddress& 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 KSocketAddress& 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 KSocketAddress 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 KSocketAddress peerAddress() const = 0;
+
+ // FIXME KDE 4.0:
+ // enable this function
+#if 0
+ /**
+ * Returns this socket's externally-visible address, if known.
+ */
+ virtual KSocketAddress 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 KSocketBase
+{
+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 KSocketAddress localAddress() const = 0;
+
+ /**
+ * Returns this socket's externally-visible address if known.
+ */
+ virtual KSocketAddress externalAddress() const = 0;
+
+private:
+ KPassiveSocketBase(const KPassiveSocketBase&);
+ KPassiveSocketBase& operator = (const KPassiveSocketBase&);
+};
+
+} // namespace KNetwork
+
+#endif