include/wx/socket.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/socket.h
   3 // Purpose:     Socket handling classes
   4 // Authors:     Guilhem Lavaux, Guillermo Rodriguez Garcia
   5 // Modified by:
   6 // Created:     April 1997
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_SOCKET_H_
  13 #define _WX_SOCKET_H_
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_SOCKETS
  18
  19 // ---------------------------------------------------------------------------
  20 // wxSocket headers
  21 // ---------------------------------------------------------------------------
  22
  23 #include "wx/event.h"
  24 #include "wx/sckaddr.h"
  25 #include "wx/list.h"
  26
  27 class wxSocketImpl;
  28
  29 // ------------------------------------------------------------------------
  30 // Types and constants
  31 // ------------------------------------------------------------------------
  32
  33 // Types of different socket notifications or events.
  34 //
  35 // NB: the values here should be consecutive and start with 0 as they are
  36 //     used to construct the wxSOCKET_XXX_FLAG bit mask values below
  37 enum wxSocketNotify
  38 {
  39     wxSOCKET_INPUT,
  40     wxSOCKET_OUTPUT,
  41     wxSOCKET_CONNECTION,
  42     wxSOCKET_LOST
  43 };
  44
  45 enum
  46 {
  47     wxSOCKET_INPUT_FLAG = 1 << wxSOCKET_INPUT,
  48     wxSOCKET_OUTPUT_FLAG = 1 << wxSOCKET_OUTPUT,
  49     wxSOCKET_CONNECTION_FLAG = 1 << wxSOCKET_CONNECTION,
  50     wxSOCKET_LOST_FLAG = 1 << wxSOCKET_LOST
  51 };
  52
  53 // this is a combination of the bit masks defined above
  54 typedef int wxSocketEventFlags;
  55
  56 enum wxSocketError
  57 {
  58     wxSOCKET_NOERROR = 0,
  59     wxSOCKET_INVOP,
  60     wxSOCKET_IOERR,
  61     wxSOCKET_INVADDR,
  62     wxSOCKET_INVSOCK,
  63     wxSOCKET_NOHOST,
  64     wxSOCKET_INVPORT,
  65     wxSOCKET_WOULDBLOCK,
  66     wxSOCKET_TIMEDOUT,
  67     wxSOCKET_MEMERR,
  68     wxSOCKET_OPTERR
  69 };
  70
  71 // socket options/flags bit masks
  72 enum
  73 {
  74     wxSOCKET_NONE           = 0x0000,
  75     wxSOCKET_NOWAIT_READ    = 0x0001,
  76     wxSOCKET_NOWAIT_WRITE   = 0x0002,
  77     wxSOCKET_NOWAIT         = wxSOCKET_NOWAIT_READ | wxSOCKET_NOWAIT_WRITE,
  78     wxSOCKET_WAITALL_READ   = 0x0004,
  79     wxSOCKET_WAITALL_WRITE  = 0x0008,
  80     wxSOCKET_WAITALL        = wxSOCKET_WAITALL_READ | wxSOCKET_WAITALL_WRITE,
  81     wxSOCKET_BLOCK          = 0x0010,
  82     wxSOCKET_REUSEADDR      = 0x0020,
  83     wxSOCKET_BROADCAST      = 0x0040,
  84     wxSOCKET_NOBIND         = 0x0080
  85 };
  86
  87 typedef int wxSocketFlags;
  88
  89 // socket kind values (badly defined, don't use)
  90 enum wxSocketType
  91 {
  92     wxSOCKET_UNINIT,
  93     wxSOCKET_CLIENT,
  94     wxSOCKET_SERVER,
  95     wxSOCKET_BASE,
  96     wxSOCKET_DATAGRAM
  97 };
  98
  99
 100 // event
 101 class WXDLLIMPEXP_FWD_NET wxSocketEvent;
 102 wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_NET, wxEVT_SOCKET, wxSocketEvent);
 103
 104 // --------------------------------------------------------------------------
 105 // wxSocketBase
 106 // --------------------------------------------------------------------------
 107
 108 class WXDLLIMPEXP_NET wxSocketBase : public wxObject
 109 {
 110 public:
 111     // Public interface
 112     // ----------------
 113
 114     // ctors and dtors
 115     wxSocketBase();
 116     wxSocketBase(wxSocketFlags flags, wxSocketType type);
 117     virtual ~wxSocketBase();
 118     void Init();
 119     bool Destroy();
 120
 121     // state
 122     bool Ok() const { return IsOk(); }
 123     bool IsOk() const { return m_impl != NULL; }
 124     bool Error() const { return LastError() != wxSOCKET_NOERROR; }
 125     bool IsClosed() const { return m_closed; }
 126     bool IsConnected() const { return m_connected; }
 127     bool IsData() { return WaitForRead(0, 0); }
 128     bool IsDisconnected() const { return !IsConnected(); }
 129     wxUint32 LastCount() const { return m_lcount; }
 130     wxUint32 LastReadCount() const { return m_lcount_read; }
 131     wxUint32 LastWriteCount() const { return m_lcount_write; }
 132     wxSocketError LastError() const;
 133     void SaveState();
 134     void RestoreState();
 135
 136     // addresses
 137     virtual bool GetLocal(wxSockAddress& addr_man) const;
 138     virtual bool GetPeer(wxSockAddress& addr_man) const;
 139     virtual bool SetLocal(const wxIPV4address& local);
 140
 141     // base IO
 142     virtual bool  Close();
 143     void ShutdownOutput();
 144     wxSocketBase& Discard();
 145     wxSocketBase& Peek(void* buffer, wxUint32 nbytes);
 146     wxSocketBase& Read(void* buffer, wxUint32 nbytes);
 147     wxSocketBase& ReadMsg(void *buffer, wxUint32 nbytes);
 148     wxSocketBase& Unread(const void *buffer, wxUint32 nbytes);
 149     wxSocketBase& Write(const void *buffer, wxUint32 nbytes);
 150     wxSocketBase& WriteMsg(const void *buffer, wxUint32 nbytes);
 151
 152     // all Wait() functions wait until their condition is satisfied or the
 153     // timeout expires; if seconds == -1 (default) then m_timeout value is used
 154     //
 155     // it is also possible to call InterruptWait() to cancel any current Wait()
 156
 157     // wait for anything at all to happen with this socket
 158     bool Wait(long seconds = -1, long milliseconds = 0);
 159
 160     // wait until we can read from or write to the socket without blocking
 161     // (notice that this does not mean that the operation will succeed but only
 162     // that it will return immediately)
 163     bool WaitForRead(long seconds = -1, long milliseconds = 0);
 164     bool WaitForWrite(long seconds = -1, long milliseconds = 0);
 165
 166     // wait until the connection is terminated
 167     bool WaitForLost(long seconds = -1, long milliseconds = 0);
 168
 169     void InterruptWait() { m_interrupt = true; }
 170
 171
 172     wxSocketFlags GetFlags() const { return m_flags; }
 173     void SetFlags(wxSocketFlags flags);
 174     virtual void SetTimeout(long seconds);
 175     long GetTimeout() const { return m_timeout; }
 176
 177     bool GetOption(int level, int optname, void *optval, int *optlen);
 178     bool SetOption(int level, int optname, const void *optval, int optlen);
 179     wxUint32 GetLastIOSize() const { return m_lcount; }
 180     wxUint32 GetLastIOReadSize() const { return m_lcount_read; }
 181     wxUint32 GetLastIOWriteSize() const { return m_lcount_write; }
 182
 183     // event handling
 184     void *GetClientData() const { return m_clientData; }
 185     void SetClientData(void *data) { m_clientData = data; }
 186     void SetEventHandler(wxEvtHandler& handler, int id = wxID_ANY);
 187     void SetNotify(wxSocketEventFlags flags);
 188     void Notify(bool notify);
 189
 190     // initialize/shutdown the sockets (done automatically so there is no need
 191     // to call these functions usually)
 192     //
 193     // should always be called from the main thread only so one of the cases
 194     // where they should indeed be called explicitly is when the first wxSocket
 195     // object in the application is created in a different thread
 196     static bool Initialize();
 197     static void Shutdown();
 198
 199     // check if wxSocket had been already initialized
 200     //
 201     // notice that this function should be only called from the main thread as
 202     // otherwise it is inherently unsafe because Initialize/Shutdown() may be
 203     // called concurrently with it in the main thread
 204     static bool IsInitialized();
 205
 206     // Implementation from now on
 207     // --------------------------
 208
 209     // do not use, should be private (called from wxSocketImpl only)
 210     void OnRequest(wxSocketNotify notify);
 211
 212     // do not use, not documented nor supported
 213     bool IsNoWait() const { return ((m_flags & wxSOCKET_NOWAIT) != 0); }
 214     wxSocketType GetType() const { return m_type; }
 215
 216 private:
 217     friend class wxSocketClient;
 218     friend class wxSocketServer;
 219     friend class wxDatagramSocket;
 220
 221     // low level IO
 222     wxUint32 DoRead(void* buffer, wxUint32 nbytes);
 223     wxUint32 DoWrite(const void *buffer, wxUint32 nbytes);
 224
 225     // wait until the given flags are set for this socket or the given timeout
 226     // (or m_timeout) expires
 227     //
 228     // notice that wxSOCKET_LOST_FLAG is always taken into account and the
 229     // function returns -1 if the connection was lost; otherwise it returns
 230     // true if any of the events specified by flags argument happened or false
 231     // if the timeout expired
 232     int DoWait(long timeout, wxSocketEventFlags flags);
 233
 234     // a helper calling DoWait() using the same convention as the public
 235     // WaitForXXX() functions use, i.e. use our timeout if seconds == -1 or the
 236     // specified timeout otherwise
 237     int DoWait(long seconds, long milliseconds, wxSocketEventFlags flags);
 238
 239     // another helper calling DoWait() using our m_timeout
 240     int DoWaitWithTimeout(wxSocketEventFlags flags)
 241     {
 242         return DoWait(m_timeout*1000, flags);
 243     }
 244
 245     // pushback buffer
 246     void     Pushback(const void *buffer, wxUint32 size);
 247     wxUint32 GetPushback(void *buffer, wxUint32 size, bool peek);
 248
 249     // store the given error as the LastError()
 250     void SetError(wxSocketError error);
 251
 252 private:
 253     // socket
 254     wxSocketImpl *m_impl;             // port-specific implementation
 255     wxSocketType  m_type;             // wxSocket type
 256
 257     // state
 258     wxSocketFlags m_flags;            // wxSocket flags
 259     bool          m_connected;        // connected?
 260     bool          m_establishing;     // establishing connection?
 261     bool          m_reading;          // busy reading?
 262     bool          m_writing;          // busy writing?
 263     bool          m_closed;           // was the other end closed?
 264     wxUint32      m_lcount;           // last IO transaction size
 265     wxUint32      m_lcount_read;      // last IO transaction size of Read() direction.
 266     wxUint32      m_lcount_write;     // last IO transaction size of Write() direction.
 267     unsigned long m_timeout;          // IO timeout value in seconds
 268                                       // (TODO: remove, wxSocketImpl has it too)
 269     wxList        m_states;           // stack of states (TODO: remove!)
 270     bool          m_interrupt;        // interrupt ongoing wait operations?
 271     bool          m_beingDeleted;     // marked for delayed deletion?
 272     wxIPV4address m_localAddress;     // bind to local address?
 273
 274     // pushback buffer
 275     void         *m_unread;           // pushback buffer
 276     wxUint32      m_unrd_size;        // pushback buffer size
 277     wxUint32      m_unrd_cur;         // pushback pointer (index into buffer)
 278
 279     // events
 280     int           m_id;               // socket id
 281     wxEvtHandler *m_handler;          // event handler
 282     void         *m_clientData;       // client data for events
 283     bool          m_notify;           // notify events to users?
 284     wxSocketEventFlags  m_eventmask;  // which events to notify?
 285     wxSocketEventFlags  m_eventsgot;  // collects events received in OnRequest()
 286
 287
 288     friend class wxSocketReadGuard;
 289     friend class wxSocketWriteGuard;
 290
 291     wxDECLARE_NO_COPY_CLASS(wxSocketBase);
 292     DECLARE_CLASS(wxSocketBase)
 293 };
 294
 295
 296 // --------------------------------------------------------------------------
 297 // wxSocketServer
 298 // --------------------------------------------------------------------------
 299
 300 class WXDLLIMPEXP_NET wxSocketServer : public wxSocketBase
 301 {
 302 public:
 303     wxSocketServer(const wxSockAddress& addr,
 304                    wxSocketFlags flags = wxSOCKET_NONE);
 305
 306     wxSocketBase* Accept(bool wait = true);
 307     bool AcceptWith(wxSocketBase& socket, bool wait = true);
 308
 309     bool WaitForAccept(long seconds = -1, long milliseconds = 0);
 310
 311     wxDECLARE_NO_COPY_CLASS(wxSocketServer);
 312     DECLARE_CLASS(wxSocketServer)
 313 };
 314
 315
 316 // --------------------------------------------------------------------------
 317 // wxSocketClient
 318 // --------------------------------------------------------------------------
 319
 320 class WXDLLIMPEXP_NET wxSocketClient : public wxSocketBase
 321 {
 322 public:
 323     wxSocketClient(wxSocketFlags flags = wxSOCKET_NONE);
 324
 325     virtual bool Connect(const wxSockAddress& addr, bool wait = true);
 326     bool Connect(const wxSockAddress& addr,
 327                  const wxSockAddress& local,
 328                  bool wait = true);
 329
 330     bool WaitOnConnect(long seconds = -1, long milliseconds = 0);
 331
 332     // Sets initial socket buffer sizes using the SO_SNDBUF and SO_RCVBUF
 333     // options before calling connect (either one can be -1 to leave it
 334     // unchanged)
 335     void SetInitialSocketBuffers(int recv, int send)
 336     {
 337         m_initialRecvBufferSize = recv;
 338         m_initialSendBufferSize = send;
 339     }
 340
 341 private:
 342     virtual bool DoConnect(const wxSockAddress& addr,
 343                            const wxSockAddress* local,
 344                            bool wait = true);
 345
 346     // buffer sizes, -1 if unset and defaults should be used
 347     int m_initialRecvBufferSize;
 348     int m_initialSendBufferSize;
 349
 350     wxDECLARE_NO_COPY_CLASS(wxSocketClient);
 351     DECLARE_CLASS(wxSocketClient)
 352 };
 353
 354
 355 // --------------------------------------------------------------------------
 356 // wxDatagramSocket
 357 // --------------------------------------------------------------------------
 358
 359 // WARNING: still in alpha stage
 360
 361 class WXDLLIMPEXP_NET wxDatagramSocket : public wxSocketBase
 362 {
 363 public:
 364     wxDatagramSocket(const wxSockAddress& addr,
 365                      wxSocketFlags flags = wxSOCKET_NONE);
 366
 367     wxDatagramSocket& RecvFrom(wxSockAddress& addr,
 368                                void *buf,
 369                                wxUint32 nBytes);
 370     wxDatagramSocket& SendTo(const wxSockAddress& addr,
 371                              const void* buf,
 372                              wxUint32 nBytes);
 373
 374     /* TODO:
 375        bool Connect(wxSockAddress& addr);
 376      */
 377
 378 private:
 379     wxDECLARE_NO_COPY_CLASS(wxDatagramSocket);
 380     DECLARE_CLASS(wxDatagramSocket)
 381 };
 382
 383
 384 // --------------------------------------------------------------------------
 385 // wxSocketEvent
 386 // --------------------------------------------------------------------------
 387
 388 class WXDLLIMPEXP_NET wxSocketEvent : public wxEvent
 389 {
 390 public:
 391     wxSocketEvent(int id = 0)
 392         : wxEvent(id, wxEVT_SOCKET)
 393     {
 394     }
 395
 396     wxSocketNotify GetSocketEvent() const { return m_event; }
 397     wxSocketBase *GetSocket() const
 398         { return (wxSocketBase *) GetEventObject(); }
 399     void *GetClientData() const { return m_clientData; }
 400
 401     virtual wxEvent *Clone() const { return new wxSocketEvent(*this); }
 402     virtual wxEventCategory GetEventCategory() const { return wxEVT_CATEGORY_SOCKET; }
 403
 404 public:
 405     wxSocketNotify  m_event;
 406     void           *m_clientData;
 407
 408     DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxSocketEvent)
 409 };
 410
 411
 412 typedef void (wxEvtHandler::*wxSocketEventFunction)(wxSocketEvent&);
 413
 414 #define wxSocketEventHandler(func) \
 415     wxEVENT_HANDLER_CAST(wxSocketEventFunction, func)
 416
 417 #define EVT_SOCKET(id, func) \
 418     wx__DECLARE_EVT1(wxEVT_SOCKET, id, wxSocketEventHandler(func))
 419
 420 #endif // wxUSE_SOCKETS
 421
 422 #endif // _WX_SOCKET_H_
 423