373 lines
13 KiB
C++
373 lines
13 KiB
C++
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: wx/private/socket.h
|
|
// Purpose: wxSocketImpl and related declarations
|
|
// Authors: Guilhem Lavaux, Vadim Zeitlin
|
|
// Created: April 1997
|
|
// Copyright: (c) 1997 Guilhem Lavaux
|
|
// (c) 2008 Vadim Zeitlin
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
/*
|
|
Brief overview of different socket classes:
|
|
|
|
- wxSocketBase is the public class representing a socket ("Base" here
|
|
refers to the fact that wxSocketClient and wxSocketServer are derived
|
|
from it and predates the convention of using "Base" for common base
|
|
classes for platform-specific classes in wxWidgets) with implementation
|
|
common to all platforms and forwarding methods whose implementation
|
|
differs between platforms to wxSocketImpl which it contains.
|
|
|
|
- wxSocketImpl is actually just an abstract base class having only code
|
|
common to all platforms, the concrete implementation classes derive from
|
|
it and are created by wxSocketImpl::Create().
|
|
|
|
- Some socket operations have different implementations in console-mode and
|
|
GUI applications. wxSocketManager class exists to abstract this in such
|
|
way that console applications (using wxBase) don't depend on wxNet. An
|
|
object of this class is made available via wxApp and GUI applications set
|
|
up a different kind of global socket manager from console ones.
|
|
|
|
TODO: it looks like wxSocketManager could be eliminated by providing
|
|
methods for registering/unregistering sockets directly in
|
|
wxEventLoop.
|
|
*/
|
|
|
|
#ifndef _WX_PRIVATE_SOCKET_H_
|
|
#define _WX_PRIVATE_SOCKET_H_
|
|
|
|
#include "wx/defs.h"
|
|
|
|
#if wxUSE_SOCKETS
|
|
|
|
#include "wx/socket.h"
|
|
#include "wx/private/sckaddr.h"
|
|
|
|
#include <stddef.h>
|
|
|
|
/*
|
|
Including sys/types.h under Cygwin results in the warnings about "fd_set
|
|
having been defined in sys/types.h" when winsock.h is included later and
|
|
doesn't seem to be necessary anyhow. It's not needed under Mac neither.
|
|
*/
|
|
#if !defined(__WXMAC__) && !defined(__WXMSW__)
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
// include the header defining timeval: under Windows this struct is used only
|
|
// with sockets so we need to include winsock.h which we do via windows.h
|
|
#ifdef __WINDOWS__
|
|
#include "wx/msw/wrapwin.h"
|
|
#else
|
|
#include <sys/time.h> // for timeval
|
|
#endif
|
|
|
|
// these definitions are for MSW when we don't use configure, otherwise these
|
|
// symbols are defined by configure
|
|
#ifndef WX_SOCKLEN_T
|
|
#define WX_SOCKLEN_T int
|
|
#endif
|
|
|
|
#ifndef SOCKOPTLEN_T
|
|
#define SOCKOPTLEN_T int
|
|
#endif
|
|
|
|
// define some symbols which winsock.h defines but traditional BSD headers
|
|
// don't
|
|
#ifndef INVALID_SOCKET
|
|
#define INVALID_SOCKET (-1)
|
|
#endif
|
|
|
|
#ifndef SOCKET_ERROR
|
|
#define SOCKET_ERROR (-1)
|
|
#endif
|
|
|
|
typedef int wxSocketEventFlags;
|
|
|
|
class wxSocketImpl;
|
|
|
|
/*
|
|
Class providing hooks abstracting the differences between console and GUI
|
|
applications for socket code.
|
|
|
|
We also have different implementations of this class for different platforms
|
|
allowing us to keep more things in the common code but the main reason for
|
|
its existence is that we want the same socket code work differently
|
|
depending on whether it's used from a console or a GUI program. This is
|
|
achieved by implementing the virtual methods of this class differently in
|
|
the objects returned by wxConsoleAppTraits::GetSocketManager() and the same
|
|
method in wxGUIAppTraits.
|
|
*/
|
|
class wxSocketManager
|
|
{
|
|
public:
|
|
// set the manager to use, we don't take ownership of it
|
|
//
|
|
// this should be called before creating the first wxSocket object,
|
|
// otherwise the manager returned by wxAppTraits::GetSocketManager() will
|
|
// be used
|
|
static void Set(wxSocketManager *manager);
|
|
|
|
// return the manager to use
|
|
//
|
|
// this initializes the manager at first use
|
|
static wxSocketManager *Get()
|
|
{
|
|
if ( !ms_manager )
|
|
Init();
|
|
|
|
return ms_manager;
|
|
}
|
|
|
|
// called before the first wxSocket is created and should do the
|
|
// initializations needed in order to use the network
|
|
//
|
|
// return true if initialized successfully; if this returns false sockets
|
|
// can't be used at all
|
|
virtual bool OnInit() = 0;
|
|
|
|
// undo the initializations of OnInit()
|
|
virtual void OnExit() = 0;
|
|
|
|
|
|
// create the socket implementation object matching this manager
|
|
virtual wxSocketImpl *CreateSocket(wxSocketBase& wxsocket) = 0;
|
|
|
|
// these functions enable or disable monitoring of the given socket for the
|
|
// specified events inside the currently running event loop (but notice
|
|
// that both BSD and Winsock implementations actually use socket->m_server
|
|
// value to determine what exactly should be monitored so it needs to be
|
|
// set before calling these functions)
|
|
//
|
|
// the default event value is used just for the convenience of wxMSW
|
|
// implementation which doesn't use this parameter anyhow, it doesn't make
|
|
// sense to pass wxSOCKET_LOST for the Unix implementation which does use
|
|
// this parameter
|
|
virtual void Install_Callback(wxSocketImpl *socket,
|
|
wxSocketNotify event = wxSOCKET_LOST) = 0;
|
|
virtual void Uninstall_Callback(wxSocketImpl *socket,
|
|
wxSocketNotify event = wxSOCKET_LOST) = 0;
|
|
|
|
virtual ~wxSocketManager() { }
|
|
|
|
private:
|
|
// get the manager to use if we don't have it yet
|
|
static void Init();
|
|
|
|
static wxSocketManager *ms_manager;
|
|
};
|
|
|
|
/*
|
|
Base class for all socket implementations providing functionality common to
|
|
BSD and Winsock sockets.
|
|
|
|
Objects of this class are not created directly but only via the factory
|
|
function wxSocketManager::CreateSocket().
|
|
*/
|
|
class wxSocketImpl
|
|
{
|
|
public:
|
|
virtual ~wxSocketImpl();
|
|
|
|
// set various socket properties: all of those can only be called before
|
|
// creating the socket
|
|
void SetTimeout(unsigned long millisec);
|
|
void SetReusable() { m_reusable = true; }
|
|
void SetBroadcast() { m_broadcast = true; }
|
|
void DontDoBind() { m_dobind = false; }
|
|
void SetInitialSocketBuffers(int recv, int send)
|
|
{
|
|
m_initialRecvBufferSize = recv;
|
|
m_initialSendBufferSize = send;
|
|
}
|
|
|
|
wxSocketError SetLocal(const wxSockAddressImpl& address);
|
|
wxSocketError SetPeer(const wxSockAddressImpl& address);
|
|
|
|
// accessors
|
|
// ---------
|
|
|
|
bool IsServer() const { return m_server; }
|
|
|
|
const wxSockAddressImpl& GetLocal(); // non const as may update m_local
|
|
const wxSockAddressImpl& GetPeer() const { return m_peer; }
|
|
|
|
wxSocketError GetError() const { return m_error; }
|
|
bool IsOk() const { return m_error == wxSOCKET_NOERROR; }
|
|
|
|
// get the error code corresponding to the last operation
|
|
virtual wxSocketError GetLastError() const = 0;
|
|
|
|
|
|
// creating/closing the socket
|
|
// --------------------------
|
|
|
|
// notice that SetLocal() must be called before creating the socket using
|
|
// any of the functions below
|
|
//
|
|
// all of Create() functions return wxSOCKET_NOERROR if the operation
|
|
// completed successfully or one of:
|
|
// wxSOCKET_INVSOCK - the socket is in use.
|
|
// wxSOCKET_INVADDR - the local (server) or peer (client) address has not
|
|
// been set.
|
|
// wxSOCKET_IOERR - any other error.
|
|
|
|
// create a socket listening on the local address specified by SetLocal()
|
|
// (notice that DontDoBind() is ignored by this function)
|
|
wxSocketError CreateServer();
|
|
|
|
// create a socket connected to the peer address specified by SetPeer()
|
|
// (notice that DontDoBind() is ignored by this function)
|
|
//
|
|
// this function may return wxSOCKET_WOULDBLOCK in addition to the return
|
|
// values listed above if wait is false
|
|
wxSocketError CreateClient(bool wait);
|
|
|
|
// create (and bind unless DontDoBind() had been called) an UDP socket
|
|
// associated with the given local address
|
|
wxSocketError CreateUDP();
|
|
|
|
// may be called whether the socket was created or not, calls DoClose() if
|
|
// it was indeed created
|
|
void Close();
|
|
|
|
// shuts down the writing end of the socket and closes it, this is a more
|
|
// graceful way to close
|
|
//
|
|
// does nothing if the socket wasn't created
|
|
void Shutdown();
|
|
|
|
|
|
// IO operations
|
|
// -------------
|
|
|
|
// basic IO, work for both TCP and UDP sockets
|
|
//
|
|
// return the number of bytes read/written (possibly 0) or -1 on error
|
|
int Read(void *buffer, int size);
|
|
int Write(const void *buffer, int size);
|
|
|
|
// basically a wrapper for select(): returns the condition of the socket,
|
|
// blocking for not longer than timeout if it is specified (otherwise just
|
|
// poll without blocking at all)
|
|
//
|
|
// flags defines what kind of conditions we're interested in, the return
|
|
// value is composed of a (possibly empty) subset of the bits set in flags
|
|
wxSocketEventFlags Select(wxSocketEventFlags flags,
|
|
const timeval *timeout = NULL);
|
|
|
|
// convenient wrapper calling Select() with our default timeout
|
|
wxSocketEventFlags SelectWithTimeout(wxSocketEventFlags flags)
|
|
{
|
|
return Select(flags, &m_timeout);
|
|
}
|
|
|
|
// just a wrapper for accept(): it is called to create a new wxSocketImpl
|
|
// corresponding to a new server connection represented by the given
|
|
// wxSocketBase, returns NULL on error (including immediately if there are
|
|
// no pending connections as our sockets are non-blocking)
|
|
wxSocketImpl *Accept(wxSocketBase& wxsocket);
|
|
|
|
|
|
// notifications
|
|
// -------------
|
|
|
|
// notify m_wxsocket about the given socket event by calling its (inaptly
|
|
// named) OnRequest() method
|
|
void NotifyOnStateChange(wxSocketNotify event);
|
|
|
|
// called after reading/writing the data from/to the socket and should
|
|
// enable back the wxSOCKET_INPUT/OUTPUT_FLAG notifications if they were
|
|
// turned off when this data was first detected
|
|
virtual void ReenableEvents(wxSocketEventFlags flags) = 0;
|
|
|
|
// TODO: make these fields protected and provide accessors for those of
|
|
// them that wxSocketBase really needs
|
|
//protected:
|
|
wxSOCKET_T m_fd;
|
|
|
|
int m_initialRecvBufferSize;
|
|
int m_initialSendBufferSize;
|
|
|
|
wxSockAddressImpl m_local,
|
|
m_peer;
|
|
wxSocketError m_error;
|
|
|
|
bool m_stream;
|
|
bool m_establishing;
|
|
bool m_reusable;
|
|
bool m_broadcast;
|
|
bool m_dobind;
|
|
|
|
struct timeval m_timeout;
|
|
|
|
protected:
|
|
wxSocketImpl(wxSocketBase& wxsocket);
|
|
|
|
// get the associated socket flags
|
|
wxSocketFlags GetSocketFlags() const { return m_wxsocket->GetFlags(); }
|
|
|
|
// true if we're a listening stream socket
|
|
bool m_server;
|
|
|
|
private:
|
|
// called by Close() if we have a valid m_fd
|
|
virtual void DoClose() = 0;
|
|
|
|
// put this socket into non-blocking mode and enable monitoring this socket
|
|
// as part of the event loop
|
|
virtual void UnblockAndRegisterWithEventLoop() = 0;
|
|
|
|
// check that the socket wasn't created yet and that the given address
|
|
// (either m_local or m_peer depending on the socket kind) is valid and
|
|
// set m_error and return false if this is not the case
|
|
bool PreCreateCheck(const wxSockAddressImpl& addr);
|
|
|
|
// set the given socket option: this just wraps setsockopt(SOL_SOCKET)
|
|
int SetSocketOption(int optname, int optval)
|
|
{
|
|
// although modern Unix systems use "const void *" for the 4th
|
|
// parameter here, old systems and Winsock still use "const char *"
|
|
return setsockopt(m_fd, SOL_SOCKET, optname,
|
|
reinterpret_cast<const char *>(&optval),
|
|
sizeof(optval));
|
|
}
|
|
|
|
// set the given socket option to true value: this is an even simpler
|
|
// wrapper for setsockopt(SOL_SOCKET) for boolean options
|
|
int EnableSocketOption(int optname)
|
|
{
|
|
return SetSocketOption(optname, 1);
|
|
}
|
|
|
|
// apply the options to the (just created) socket and register it with the
|
|
// event loop by calling UnblockAndRegisterWithEventLoop()
|
|
void PostCreation();
|
|
|
|
// update local address after binding/connecting
|
|
wxSocketError UpdateLocalAddress();
|
|
|
|
// functions used to implement Read/Write()
|
|
int RecvStream(void *buffer, int size);
|
|
int RecvDgram(void *buffer, int size);
|
|
int SendStream(const void *buffer, int size);
|
|
int SendDgram(const void *buffer, int size);
|
|
|
|
|
|
// set in ctor and never changed except that it's reset to NULL when the
|
|
// socket is shut down
|
|
wxSocketBase *m_wxsocket;
|
|
|
|
wxDECLARE_NO_COPY_CLASS(wxSocketImpl);
|
|
};
|
|
|
|
#if defined(__WINDOWS__)
|
|
#include "wx/msw/private/sockmsw.h"
|
|
#else
|
|
#include "wx/unix/private/sockunix.h"
|
|
#endif
|
|
|
|
#endif /* wxUSE_SOCKETS */
|
|
|
|
#endif /* _WX_PRIVATE_SOCKET_H_ */
|