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