src/common/socket.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:       socket.cpp
   3 // Purpose:    Socket handler classes
   4 // Authors:    Guilhem Lavaux, Guillermo Rodriguez Garcia
   5 // Created:    April 1997
   6 // Copyright:  (C) 1999-1997, Guilhem Lavaux
   7 //             (C) 2000-1999, Guillermo Rodriguez Garcia
   8 // RCS_ID:     $Id$
   9 // License:    see wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ==========================================================================
  13 // Declarations
  14 // ==========================================================================
  15
  16 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  17 #pragma implementation "socket.h"
  18 #endif
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_SOCKETS
  28
  29 #include "wx/app.h"
  30 #include "wx/apptrait.h"
  31 #include "wx/defs.h"
  32 #include "wx/object.h"
  33 #include "wx/string.h"
  34 #include "wx/timer.h"
  35 #include "wx/utils.h"
  36 #include "wx/module.h"
  37 #include "wx/log.h"
  38 #include "wx/intl.h"
  39 #include "wx/event.h"
  40
  41 #include "wx/sckaddr.h"
  42 #include "wx/socket.h"
  43
  44 // DLL options compatibility check:
  45 #include "wx/build.h"
  46 WX_CHECK_BUILD_OPTIONS("wxNet")
  47
  48 // --------------------------------------------------------------------------
  49 // macros and constants
  50 // --------------------------------------------------------------------------
  51
  52 // discard buffer
  53 #define MAX_DISCARD_SIZE (10 * 1024)
  54
  55 // what to do within waits: we have 2 cases: from the main thread itself we
  56 // have to call wxYield() to let the events (including the GUI events and the
  57 // low-level (not wxWindows) events from GSocket) be processed. From another
  58 // thread it is enough to just call wxThread::Yield() which will give away the
  59 // rest of our time slice: the explanation is that the events will be processed
  60 // by the main thread anyhow, without calling wxYield(), but we don't want to
  61 // eat the CPU time uselessly while sitting in the loop waiting for the data
  62 #if wxUSE_THREADS
  63     #define PROCESS_EVENTS()        \
  64     {                               \
  65         if ( wxThread::IsMain() )   \
  66             wxYield();              \
  67         else                        \
  68             wxThread::Yield();      \
  69     }
  70 #else // !wxUSE_THREADS
  71     #define PROCESS_EVENTS() wxYield()
  72 #endif // wxUSE_THREADS/!wxUSE_THREADS
  73
  74 #define wxTRACE_Socket _T("wxSocket")
  75
  76 // --------------------------------------------------------------------------
  77 // wxWin macros
  78 // --------------------------------------------------------------------------
  79
  80 IMPLEMENT_CLASS(wxSocketBase, wxObject)
  81 IMPLEMENT_CLASS(wxSocketServer, wxSocketBase)
  82 IMPLEMENT_CLASS(wxSocketClient, wxSocketBase)
  83 IMPLEMENT_CLASS(wxDatagramSocket, wxSocketBase)
  84 IMPLEMENT_DYNAMIC_CLASS(wxSocketEvent, wxEvent)
  85
  86 // --------------------------------------------------------------------------
  87 // private classes
  88 // --------------------------------------------------------------------------
  89
  90 class wxSocketState : public wxObject
  91 {
  92 public:
  93   wxSocketFlags            m_flags;
  94   wxSocketEventFlags       m_eventmask;
  95   bool                     m_notify;
  96   void                    *m_clientData;
  97
  98 public:
  99   wxSocketState() : wxObject() {}
 100
 101     DECLARE_NO_COPY_CLASS(wxSocketState)
 102 };
 103
 104 // ==========================================================================
 105 // wxSocketBase
 106 // ==========================================================================
 107
 108 // --------------------------------------------------------------------------
 109 // Initialization and shutdown
 110 // --------------------------------------------------------------------------
 111
 112 // FIXME-MT: all this is MT-unsafe, of course, we should protect all accesses
 113 //           to m_countInit with a crit section
 114 size_t wxSocketBase::m_countInit = 0;
 115
 116 bool wxSocketBase::IsInitialized()
 117 {
 118     return m_countInit > 0;
 119 }
 120
 121 bool wxSocketBase::Initialize()
 122 {
 123     if ( !m_countInit++ )
 124     {
 125         wxAppTraits *traits = wxAppConsole::GetInstance() ?
 126                               wxAppConsole::GetInstance()->GetTraits() : NULL;
 127         GSocketGUIFunctionsTable *functions =
 128             traits ? traits->GetSocketGUIFunctionsTable() : NULL;
 129         GSocket_SetGUIFunctions(functions);
 130
 131         if ( !GSocket_Init() )
 132         {
 133             m_countInit--;
 134
 135             return FALSE;
 136         }
 137     }
 138
 139     return TRUE;
 140 }
 141
 142 void wxSocketBase::Shutdown()
 143 {
 144     // we should be initialized
 145     wxASSERT_MSG( m_countInit, _T("extra call to Shutdown()") );
 146     if ( !--m_countInit )
 147     {
 148         GSocket_Cleanup();
 149     }
 150 }
 151
 152 // --------------------------------------------------------------------------
 153 // Ctor and dtor
 154 // --------------------------------------------------------------------------
 155
 156 void wxSocketBase::Init()
 157 {
 158   m_socket       = NULL;
 159   m_type         = wxSOCKET_UNINIT;
 160
 161   // state
 162   m_flags        = 0;
 163   m_connected    =
 164   m_establishing =
 165   m_reading      =
 166   m_writing      =
 167   m_error        = FALSE;
 168   m_lcount       = 0;
 169   m_timeout      = 600;
 170   m_beingDeleted = FALSE;
 171
 172   // pushback buffer
 173   m_unread       = NULL;
 174   m_unrd_size    = 0;
 175   m_unrd_cur     = 0;
 176
 177   // events
 178   m_id           = -1;
 179   m_handler      = NULL;
 180   m_clientData   = NULL;
 181   m_notify       = FALSE;
 182   m_eventmask    = 0;
 183
 184   if ( !IsInitialized() )
 185   {
 186       // this Initialize() will be undone by wxSocketModule::OnExit(), all the
 187       // other calls to it should be matched by a call to Shutdown()
 188       Initialize();
 189   }
 190 }
 191
 192 wxSocketBase::wxSocketBase()
 193 {
 194   Init();
 195 }
 196
 197 wxSocketBase::wxSocketBase(wxSocketFlags flags, wxSocketType type)
 198 {
 199   Init();
 200
 201   m_flags = flags;
 202   m_type  = type;
 203 }
 204
 205 wxSocketBase::~wxSocketBase()
 206 {
 207   // Just in case the app called Destroy() *and* then deleted
 208   // the socket immediately: don't leave dangling pointers.
 209   wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 210   if ( traits )
 211       traits->RemoveFromPendingDelete(this);
 212
 213   // Shutdown and close the socket
 214   if (!m_beingDeleted)
 215     Close();
 216
 217   // Destroy the GSocket object
 218   if (m_socket)
 219     GSocket_destroy(m_socket);
 220
 221   // Free the pushback buffer
 222   if (m_unread)
 223     free(m_unread);
 224 }
 225
 226 bool wxSocketBase::Destroy()
 227 {
 228   // Delayed destruction: the socket will be deleted during the next
 229   // idle loop iteration. This ensures that all pending events have
 230   // been processed.
 231   m_beingDeleted = TRUE;
 232
 233   // Shutdown and close the socket
 234   Close();
 235
 236   // Supress events from now on
 237   Notify(FALSE);
 238
 239   // schedule this object for deletion
 240   wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 241   if ( traits )
 242   {
 243       // let the traits object decide what to do with us
 244       traits->ScheduleForDestroy(this);
 245   }
 246   else // no app or no traits
 247   {
 248       // in wxBase we might have no app object at all, don't leak memory
 249       delete this;
 250   }
 251
 252   return TRUE;
 253 }
 254
 255 // --------------------------------------------------------------------------
 256 // Basic IO calls
 257 // --------------------------------------------------------------------------
 258
 259 // The following IO operations update m_error and m_lcount:
 260 // {Read, Write, ReadMsg, WriteMsg, Peek, Unread, Discard}
 261 //
 262 // TODO: Should Connect, Accept and AcceptWith update m_error?
 263
 264 bool wxSocketBase::Close()
 265 {
 266   // Interrupt pending waits
 267   InterruptWait();
 268
 269   if (m_socket)
 270   {
 271     // Disable callbacks
 272     GSocket_UnsetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
 273                                     GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG);
 274
 275     // Shutdown the connection
 276     GSocket_Shutdown(m_socket);
 277   }
 278
 279   m_connected = FALSE;
 280   m_establishing = FALSE;
 281   return TRUE;
 282 }
 283
 284 wxSocketBase& wxSocketBase::Read(void* buffer, wxUint32 nbytes)
 285 {
 286   // Mask read events
 287   m_reading = TRUE;
 288
 289   m_lcount = _Read(buffer, nbytes);
 290
 291   // If in wxSOCKET_WAITALL mode, all bytes should have been read.
 292   if (m_flags & wxSOCKET_WAITALL)
 293     m_error = (m_lcount != nbytes);
 294   else
 295     m_error = (m_lcount == 0);
 296
 297   // Allow read events from now on
 298   m_reading = FALSE;
 299
 300   return *this;
 301 }
 302
 303 wxUint32 wxSocketBase::_Read(void* buffer, wxUint32 nbytes)
 304 {
 305   int total;
 306   int ret = 1;
 307
 308   // Try the pushback buffer first
 309   total = GetPushback(buffer, nbytes, FALSE);
 310   nbytes -= total;
 311   buffer  = (char *)buffer + total;
 312
 313   // Return now in one of the following cases:
 314   // - the socket is invalid,
 315   // - we got all the data,
 316   // - we got *some* data and we are not using wxSOCKET_WAITALL.
 317   if ( !m_socket ||
 318        !nbytes ||
 319        ((total != 0) && !(m_flags & wxSOCKET_WAITALL)) )
 320     return total;
 321
 322   // Possible combinations (they are checked in this order)
 323   // wxSOCKET_NOWAIT
 324   // wxSOCKET_WAITALL (with or without wxSOCKET_BLOCK)
 325   // wxSOCKET_BLOCK
 326   // wxSOCKET_NONE
 327   //
 328   if (m_flags & wxSOCKET_NOWAIT)
 329   {
 330     GSocket_SetNonBlocking(m_socket, 1);
 331     ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
 332     GSocket_SetNonBlocking(m_socket, 0);
 333
 334     if (ret > 0)
 335       total += ret;
 336   }
 337   else
 338   {
 339     bool more = TRUE;
 340
 341     while (more)
 342     {
 343       if ( !(m_flags & wxSOCKET_BLOCK) && !WaitForRead() )
 344         break;
 345
 346       ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
 347
 348       if (ret > 0)
 349       {
 350         total  += ret;
 351         nbytes -= ret;
 352         buffer  = (char *)buffer + ret;
 353       }
 354
 355       // If we got here and wxSOCKET_WAITALL is not set, we can leave
 356       // now. Otherwise, wait until we recv all the data or until there
 357       // is an error.
 358       //
 359       more = (ret > 0 && nbytes > 0 && (m_flags & wxSOCKET_WAITALL));
 360     }
 361   }
 362
 363   return total;
 364 }
 365
 366 wxSocketBase& wxSocketBase::ReadMsg(void* buffer, wxUint32 nbytes)
 367 {
 368   wxUint32 len, len2, sig, total;
 369   bool error;
 370   int old_flags;
 371   struct
 372   {
 373     unsigned char sig[4];
 374     unsigned char len[4];
 375   } msg;
 376
 377   // Mask read events
 378   m_reading = TRUE;
 379
 380   total = 0;
 381   error = TRUE;
 382   old_flags = m_flags;
 383   SetFlags((m_flags & wxSOCKET_BLOCK) | wxSOCKET_WAITALL);
 384
 385   if (_Read(&msg, sizeof(msg)) != sizeof(msg))
 386     goto exit;
 387
 388   sig = (wxUint32)msg.sig[0];
 389   sig |= (wxUint32)(msg.sig[1] << 8);
 390   sig |= (wxUint32)(msg.sig[2] << 16);
 391   sig |= (wxUint32)(msg.sig[3] << 24);
 392
 393   if (sig != 0xfeeddead)
 394   {
 395     wxLogWarning(_("wxSocket: invalid signature in ReadMsg."));
 396     goto exit;
 397   }
 398
 399   len = (wxUint32)msg.len[0];
 400   len |= (wxUint32)(msg.len[1] << 8);
 401   len |= (wxUint32)(msg.len[2] << 16);
 402   len |= (wxUint32)(msg.len[3] << 24);
 403
 404   if (len > nbytes)
 405   {
 406     len2 = len - nbytes;
 407     len = nbytes;
 408   }
 409   else
 410     len2 = 0;
 411
 412   // Don't attemp to read if the msg was zero bytes long.
 413   if (len)
 414   {
 415     total = _Read(buffer, len);
 416
 417     if (total != len)
 418       goto exit;
 419   }
 420   if (len2)
 421   {
 422     char *discard_buffer = new char[MAX_DISCARD_SIZE];
 423     long discard_len;
 424
 425     // NOTE: discarded bytes don't add to m_lcount.
 426     do
 427     {
 428       discard_len = ((len2 > MAX_DISCARD_SIZE)? MAX_DISCARD_SIZE : len2);
 429       discard_len = _Read(discard_buffer, (wxUint32)discard_len);
 430       len2 -= (wxUint32)discard_len;
 431     }
 432     while ((discard_len > 0) && len2);
 433
 434     delete [] discard_buffer;
 435
 436     if (len2 != 0)
 437       goto exit;
 438   }
 439   if (_Read(&msg, sizeof(msg)) != sizeof(msg))
 440     goto exit;
 441
 442   sig = (wxUint32)msg.sig[0];
 443   sig |= (wxUint32)(msg.sig[1] << 8);
 444   sig |= (wxUint32)(msg.sig[2] << 16);
 445   sig |= (wxUint32)(msg.sig[3] << 24);
 446
 447   if (sig != 0xdeadfeed)
 448   {
 449     wxLogWarning(_("wxSocket: invalid signature in ReadMsg."));
 450     goto exit;
 451   }
 452
 453   // everything was OK
 454   error = FALSE;
 455
 456 exit:
 457   m_error = error;
 458   m_lcount = total;
 459   m_reading = FALSE;
 460   SetFlags(old_flags);
 461
 462   return *this;
 463 }
 464
 465 wxSocketBase& wxSocketBase::Peek(void* buffer, wxUint32 nbytes)
 466 {
 467   // Mask read events
 468   m_reading = TRUE;
 469
 470   m_lcount = _Read(buffer, nbytes);
 471   Pushback(buffer, m_lcount);
 472
 473   // If in wxSOCKET_WAITALL mode, all bytes should have been read.
 474   if (m_flags & wxSOCKET_WAITALL)
 475     m_error = (m_lcount != nbytes);
 476   else
 477     m_error = (m_lcount == 0);
 478
 479   // Allow read events again
 480   m_reading = FALSE;
 481
 482   return *this;
 483 }
 484
 485 wxSocketBase& wxSocketBase::Write(const void *buffer, wxUint32 nbytes)
 486 {
 487   // Mask write events
 488   m_writing = TRUE;
 489
 490   m_lcount = _Write(buffer, nbytes);
 491
 492   // If in wxSOCKET_WAITALL mode, all bytes should have been written.
 493   if (m_flags & wxSOCKET_WAITALL)
 494     m_error = (m_lcount != nbytes);
 495   else
 496     m_error = (m_lcount == 0);
 497
 498   // Allow write events again
 499   m_writing = FALSE;
 500
 501   return *this;
 502 }
 503
 504 wxUint32 wxSocketBase::_Write(const void *buffer, wxUint32 nbytes)
 505 {
 506   wxUint32 total = 0;
 507   int ret = 1;
 508
 509   // If the socket is invalid or parameters are ill, return immediately
 510   if (!m_socket || !buffer || !nbytes)
 511     return 0;
 512
 513   // Possible combinations (they are checked in this order)
 514   // wxSOCKET_NOWAIT
 515   // wxSOCKET_WAITALL (with or without wxSOCKET_BLOCK)
 516   // wxSOCKET_BLOCK
 517   // wxSOCKET_NONE
 518   //
 519   if (m_flags & wxSOCKET_NOWAIT)
 520   {
 521     GSocket_SetNonBlocking(m_socket, 1);
 522     ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
 523     GSocket_SetNonBlocking(m_socket, 0);
 524
 525     if (ret > 0)
 526       total = ret;
 527   }
 528   else
 529   {
 530     bool more = TRUE;
 531
 532     while (more)
 533     {
 534       if ( !(m_flags & wxSOCKET_BLOCK) && !WaitForWrite() )
 535         break;
 536
 537       ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
 538
 539       if (ret > 0)
 540       {
 541         total  += ret;
 542         nbytes -= ret;
 543         buffer  = (const char *)buffer + ret;
 544       }
 545
 546       // If we got here and wxSOCKET_WAITALL is not set, we can leave
 547       // now. Otherwise, wait until we send all the data or until there
 548       // is an error.
 549       //
 550       more = (ret > 0 && nbytes > 0 && (m_flags & wxSOCKET_WAITALL));
 551     }
 552   }
 553
 554   return total;
 555 }
 556
 557 wxSocketBase& wxSocketBase::WriteMsg(const void *buffer, wxUint32 nbytes)
 558 {
 559   wxUint32 total;
 560   bool error;
 561   struct
 562   {
 563     unsigned char sig[4];
 564     unsigned char len[4];
 565   } msg;
 566
 567   // Mask write events
 568   m_writing = TRUE;
 569
 570   error = TRUE;
 571   total = 0;
 572   SetFlags((m_flags & wxSOCKET_BLOCK) | wxSOCKET_WAITALL);
 573
 574   msg.sig[0] = (unsigned char) 0xad;
 575   msg.sig[1] = (unsigned char) 0xde;
 576   msg.sig[2] = (unsigned char) 0xed;
 577   msg.sig[3] = (unsigned char) 0xfe;
 578
 579   msg.len[0] = (unsigned char) (nbytes & 0xff);
 580   msg.len[1] = (unsigned char) ((nbytes >> 8) & 0xff);
 581   msg.len[2] = (unsigned char) ((nbytes >> 16) & 0xff);
 582   msg.len[3] = (unsigned char) ((nbytes >> 24) & 0xff);
 583
 584   if (_Write(&msg, sizeof(msg)) < sizeof(msg))
 585     goto exit;
 586
 587   total = _Write(buffer, nbytes);
 588
 589   if (total < nbytes)
 590     goto exit;
 591
 592   msg.sig[0] = (unsigned char) 0xed;
 593   msg.sig[1] = (unsigned char) 0xfe;
 594   msg.sig[2] = (unsigned char) 0xad;
 595   msg.sig[3] = (unsigned char) 0xde;
 596   msg.len[0] = msg.len[1] = msg.len[2] = msg.len[3] = (char) 0;
 597
 598   if ((_Write(&msg, sizeof(msg))) < sizeof(msg))
 599     goto exit;
 600
 601   // everything was OK
 602   error = FALSE;
 603
 604 exit:
 605   m_error = error;
 606   m_lcount = total;
 607   m_writing = FALSE;
 608
 609   return *this;
 610 }
 611
 612 wxSocketBase& wxSocketBase::Unread(const void *buffer, wxUint32 nbytes)
 613 {
 614   if (nbytes != 0)
 615     Pushback(buffer, nbytes);
 616
 617   m_error = FALSE;
 618   m_lcount = nbytes;
 619
 620   return *this;
 621 }
 622
 623 wxSocketBase& wxSocketBase::Discard()
 624 {
 625   char *buffer = new char[MAX_DISCARD_SIZE];
 626   wxUint32 ret;
 627   wxUint32 total = 0;
 628
 629   // Mask read events
 630   m_reading = TRUE;
 631
 632   SetFlags(wxSOCKET_NOWAIT);
 633
 634   do
 635   {
 636     ret = _Read(buffer, MAX_DISCARD_SIZE);
 637     total += ret;
 638   }
 639   while (ret == MAX_DISCARD_SIZE);
 640
 641   delete[] buffer;
 642   m_lcount = total;
 643   m_error  = FALSE;
 644
 645   // Allow read events again
 646   m_reading = FALSE;
 647
 648   return *this;
 649 }
 650
 651 // --------------------------------------------------------------------------
 652 // Wait functions
 653 // --------------------------------------------------------------------------
 654
 655 // All Wait functions poll the socket using GSocket_Select() to
 656 // check for the specified combination of conditions, until one
 657 // of these conditions become true, an error occurs, or the
 658 // timeout elapses. The polling loop calls PROCESS_EVENTS(), so
 659 // this won't block the GUI.
 660
 661 bool wxSocketBase::_Wait(long seconds,
 662                          long milliseconds,
 663                          wxSocketEventFlags flags)
 664 {
 665   GSocketEventFlags result;
 666   long timeout;
 667
 668   // Set this to TRUE to interrupt ongoing waits
 669   m_interrupt = FALSE;
 670
 671   // Check for valid socket
 672   if (!m_socket)
 673     return FALSE;
 674
 675   // Check for valid timeout value.
 676   if (seconds != -1)
 677     timeout = seconds * 1000 + milliseconds;
 678   else
 679     timeout = m_timeout * 1000;
 680
 681   // Wait in an active polling loop.
 682   //
 683   // NOTE: We duplicate some of the code in OnRequest, but this doesn't
 684   //   hurt. It has to be here because the (GSocket) event might arrive
 685   //   a bit delayed, and it has to be in OnRequest as well because we
 686   //   don't know whether the Wait functions are being used.
 687   //
 688   // Do this at least once (important if timeout == 0, when
 689   // we are just polling). Also, if just polling, do not yield.
 690
 691   wxStopWatch chrono;
 692   bool done = FALSE;
 693
 694   while (!done)
 695   {
 696     result = GSocket_Select(m_socket, flags | GSOCK_LOST_FLAG);
 697
 698     // Incoming connection (server) or connection established (client)
 699     if (result & GSOCK_CONNECTION_FLAG)
 700     {
 701       m_connected = TRUE;
 702       m_establishing = FALSE;
 703       return TRUE;
 704     }
 705
 706     // Data available or output buffer ready
 707     if ((result & GSOCK_INPUT_FLAG) || (result & GSOCK_OUTPUT_FLAG))
 708     {
 709       return TRUE;
 710     }
 711
 712     // Connection lost
 713     if (result & GSOCK_LOST_FLAG)
 714     {
 715       m_connected = FALSE;
 716       m_establishing = FALSE;
 717       return (flags & GSOCK_LOST_FLAG) != 0;
 718     }
 719
 720     // Wait more?
 721     if ((!timeout) || (chrono.Time() > timeout) || (m_interrupt))
 722       done = TRUE;
 723     else
 724       PROCESS_EVENTS();
 725   }
 726
 727   return FALSE;
 728 }
 729
 730 bool wxSocketBase::Wait(long seconds, long milliseconds)
 731 {
 732   return _Wait(seconds, milliseconds, GSOCK_INPUT_FLAG |
 733                                       GSOCK_OUTPUT_FLAG |
 734                                       GSOCK_CONNECTION_FLAG |
 735                                       GSOCK_LOST_FLAG);
 736 }
 737
 738 bool wxSocketBase::WaitForRead(long seconds, long milliseconds)
 739 {
 740   // Check pushback buffer before entering _Wait
 741   if (m_unread)
 742     return TRUE;
 743
 744   // Note that GSOCK_INPUT_LOST has to be explicitly passed to
 745   // _Wait becuase of the semantics of WaitForRead: a return
 746   // value of TRUE means that a GSocket_Read call will return
 747   // immediately, not that there is actually data to read.
 748
 749   return _Wait(seconds, milliseconds, GSOCK_INPUT_FLAG |
 750                                       GSOCK_LOST_FLAG);
 751 }
 752
 753 bool wxSocketBase::WaitForWrite(long seconds, long milliseconds)
 754 {
 755   return _Wait(seconds, milliseconds, GSOCK_OUTPUT_FLAG);
 756 }
 757
 758 bool wxSocketBase::WaitForLost(long seconds, long milliseconds)
 759 {
 760   return _Wait(seconds, milliseconds, GSOCK_LOST_FLAG);
 761 }
 762
 763 // --------------------------------------------------------------------------
 764 // Miscellaneous
 765 // --------------------------------------------------------------------------
 766
 767 //
 768 // Get local or peer address
 769 //
 770
 771 bool wxSocketBase::GetPeer(wxSockAddress& addr_man) const
 772 {
 773   GAddress *peer;
 774
 775   if (!m_socket)
 776     return FALSE;
 777
 778   peer = GSocket_GetPeer(m_socket);
 779
 780     // copying a null address would just trigger an assert anyway
 781
 782   if (!peer)
 783     return FALSE;
 784
 785   addr_man.SetAddress(peer);
 786   GAddress_destroy(peer);
 787
 788   return TRUE;
 789 }
 790
 791 bool wxSocketBase::GetLocal(wxSockAddress& addr_man) const
 792 {
 793   GAddress *local;
 794
 795   if (!m_socket)
 796     return FALSE;
 797
 798   local = GSocket_GetLocal(m_socket);
 799   addr_man.SetAddress(local);
 800   GAddress_destroy(local);
 801
 802   return TRUE;
 803 }
 804
 805 //
 806 // Save and restore socket state
 807 //
 808
 809 void wxSocketBase::SaveState()
 810 {
 811   wxSocketState *state;
 812
 813   state = new wxSocketState();
 814
 815   state->m_flags      = m_flags;
 816   state->m_notify     = m_notify;
 817   state->m_eventmask  = m_eventmask;
 818   state->m_clientData = m_clientData;
 819
 820   m_states.Append(state);
 821 }
 822
 823 void wxSocketBase::RestoreState()
 824 {
 825   wxList::compatibility_iterator node;
 826   wxSocketState *state;
 827
 828   node = m_states.GetLast();
 829   if (!node)
 830     return;
 831
 832   state = (wxSocketState *)node->GetData();
 833
 834   m_flags      = state->m_flags;
 835   m_notify     = state->m_notify;
 836   m_eventmask  = state->m_eventmask;
 837   m_clientData = state->m_clientData;
 838
 839   m_states.Erase(node);
 840   delete state;
 841 }
 842
 843 //
 844 // Timeout and flags
 845 //
 846
 847 void wxSocketBase::SetTimeout(long seconds)
 848 {
 849   m_timeout = seconds;
 850
 851   if (m_socket)
 852     GSocket_SetTimeout(m_socket, m_timeout * 1000);
 853 }
 854
 855 void wxSocketBase::SetFlags(wxSocketFlags flags)
 856 {
 857   m_flags = flags;
 858 }
 859
 860
 861 // --------------------------------------------------------------------------
 862 // Event handling
 863 // --------------------------------------------------------------------------
 864
 865 // A note on how events are processed, which is probably the most
 866 // difficult thing to get working right while keeping the same API
 867 // and functionality for all platforms.
 868 //
 869 // When GSocket detects an event, it calls wx_socket_callback, which in
 870 // turn just calls wxSocketBase::OnRequest in the corresponding wxSocket
 871 // object. OnRequest does some housekeeping, and if the event is to be
 872 // propagated to the user, it creates a new wxSocketEvent object and
 873 // posts it. The event is not processed immediately, but delayed with
 874 // AddPendingEvent instead. This is necessary in order to decouple the
 875 // event processing from wx_socket_callback; otherwise, subsequent IO
 876 // calls made from the user event handler would fail, as gtk callbacks
 877 // are not reentrant.
 878 //
 879 // Note that, unlike events, user callbacks (now deprecated) are _not_
 880 // decoupled from wx_socket_callback and thus they suffer from a variety
 881 // of problems. Avoid them where possible and use events instead.
 882
 883 extern "C"
 884 void LINKAGEMODE wx_socket_callback(GSocket * WXUNUSED(socket),
 885                                     GSocketEvent notification,
 886                                     char *cdata)
 887 {
 888   wxSocketBase *sckobj = (wxSocketBase *)cdata;
 889
 890   sckobj->OnRequest((wxSocketNotify) notification);
 891 }
 892
 893 void wxSocketBase::OnRequest(wxSocketNotify notification)
 894 {
 895   // NOTE: We duplicate some of the code in _Wait, but this doesn't
 896   //   hurt. It has to be here because the (GSocket) event might arrive
 897   //   a bit delayed, and it has to be in _Wait as well because we don't
 898   //   know whether the Wait functions are being used.
 899
 900   switch(notification)
 901   {
 902     case wxSOCKET_CONNECTION:
 903       m_establishing = FALSE;
 904       m_connected = TRUE;
 905       break;
 906
 907     // If we are in the middle of a R/W operation, do not
 908     // propagate events to users. Also, filter 'late' events
 909     // which are no longer valid.
 910
 911     case wxSOCKET_INPUT:
 912       if (m_reading || !GSocket_Select(m_socket, GSOCK_INPUT_FLAG))
 913         return;
 914       break;
 915
 916     case wxSOCKET_OUTPUT:
 917       if (m_writing || !GSocket_Select(m_socket, GSOCK_OUTPUT_FLAG))
 918         return;
 919       break;
 920
 921     case wxSOCKET_LOST:
 922       m_connected = FALSE;
 923       m_establishing = FALSE;
 924       break;
 925
 926     default:
 927       break;
 928   }
 929
 930   // Schedule the event
 931
 932   wxSocketEventFlags flag = 0;
 933   switch (notification)
 934   {
 935     case GSOCK_INPUT:      flag = GSOCK_INPUT_FLAG; break;
 936     case GSOCK_OUTPUT:     flag = GSOCK_OUTPUT_FLAG; break;
 937     case GSOCK_CONNECTION: flag = GSOCK_CONNECTION_FLAG; break;
 938     case GSOCK_LOST:       flag = GSOCK_LOST_FLAG; break;
 939     default:
 940       wxLogWarning(_("wxSocket: unknown event!."));
 941       return;
 942   }
 943
 944   if (((m_eventmask & flag) == flag) && m_notify)
 945   {
 946     if (m_handler)
 947     {
 948       wxSocketEvent event(m_id);
 949       event.m_event      = notification;
 950       event.m_clientData = m_clientData;
 951       event.SetEventObject(this);
 952
 953       m_handler->AddPendingEvent(event);
 954     }
 955   }
 956 }
 957
 958 void wxSocketBase::Notify(bool notify)
 959 {
 960   m_notify = notify;
 961 }
 962
 963 void wxSocketBase::SetNotify(wxSocketEventFlags flags)
 964 {
 965   m_eventmask = flags;
 966 }
 967
 968 void wxSocketBase::SetEventHandler(wxEvtHandler& handler, int id)
 969 {
 970   m_handler = &handler;
 971   m_id      = id;
 972 }
 973
 974 // --------------------------------------------------------------------------
 975 // Pushback buffer
 976 // --------------------------------------------------------------------------
 977
 978 void wxSocketBase::Pushback(const void *buffer, wxUint32 size)
 979 {
 980   if (!size) return;
 981
 982   if (m_unread == NULL)
 983     m_unread = malloc(size);
 984   else
 985   {
 986     void *tmp;
 987
 988     tmp = malloc(m_unrd_size + size);
 989     memcpy((char *)tmp + size, m_unread, m_unrd_size);
 990     free(m_unread);
 991
 992     m_unread = tmp;
 993   }
 994
 995   m_unrd_size += size;
 996
 997   memcpy(m_unread, buffer, size);
 998 }
 999
1000 wxUint32 wxSocketBase::GetPushback(void *buffer, wxUint32 size, bool peek)
1001 {
1002   if (!m_unrd_size)
1003     return 0;
1004
1005   if (size > (m_unrd_size-m_unrd_cur))
1006     size = m_unrd_size-m_unrd_cur;
1007
1008   memcpy(buffer, (char *)m_unread + m_unrd_cur, size);
1009
1010   if (!peek)
1011   {
1012     m_unrd_cur += size;
1013     if (m_unrd_size == m_unrd_cur)
1014     {
1015       free(m_unread);
1016       m_unread = NULL;
1017       m_unrd_size = 0;
1018       m_unrd_cur  = 0;
1019     }
1020   }
1021
1022   return size;
1023 }
1024
1025
1026 // ==========================================================================
1027 // wxSocketServer
1028 // ==========================================================================
1029
1030 // --------------------------------------------------------------------------
1031 // Ctor
1032 // --------------------------------------------------------------------------
1033
1034 wxSocketServer::wxSocketServer(wxSockAddress& addr_man,
1035                                wxSocketFlags flags)
1036               : wxSocketBase(flags, wxSOCKET_SERVER)
1037 {
1038     wxLogTrace( wxTRACE_Socket, _T("Opening wxSocketServer") );
1039
1040     m_socket = GSocket_new();
1041
1042     if (!m_socket)
1043     {
1044         wxLogTrace( wxTRACE_Socket, _T("*** GSocket_new failed") );
1045         return;
1046     }
1047
1048         // Setup the socket as server
1049
1050     GSocket_SetLocal(m_socket, addr_man.GetAddress());
1051     if (GSocket_SetServer(m_socket) != GSOCK_NOERROR)
1052     {
1053         GSocket_destroy(m_socket);
1054         m_socket = NULL;
1055
1056         wxLogTrace( wxTRACE_Socket, _T("*** GSocket_SetServer failed") );
1057         return;
1058     }
1059
1060     GSocket_SetTimeout(m_socket, m_timeout * 1000);
1061     GSocket_SetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1062                                   GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1063                                   wx_socket_callback, (char *)this);
1064 }
1065
1066 // --------------------------------------------------------------------------
1067 // Accept
1068 // --------------------------------------------------------------------------
1069
1070 bool wxSocketServer::AcceptWith(wxSocketBase& sock, bool wait)
1071 {
1072   GSocket *child_socket;
1073
1074   if (!m_socket)
1075     return FALSE;
1076
1077   // If wait == FALSE, then the call should be nonblocking.
1078   // When we are finished, we put the socket to blocking mode
1079   // again.
1080
1081   if (!wait)
1082     GSocket_SetNonBlocking(m_socket, 1);
1083
1084   child_socket = GSocket_WaitConnection(m_socket);
1085
1086   if (!wait)
1087     GSocket_SetNonBlocking(m_socket, 0);
1088
1089   if (!child_socket)
1090     return FALSE;
1091
1092   sock.m_type = wxSOCKET_BASE;
1093   sock.m_socket = child_socket;
1094   sock.m_connected = TRUE;
1095
1096   GSocket_SetTimeout(sock.m_socket, sock.m_timeout * 1000);
1097   GSocket_SetCallback(sock.m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1098                                      GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1099                                      wx_socket_callback, (char *)&sock);
1100
1101   return TRUE;
1102 }
1103
1104 wxSocketBase *wxSocketServer::Accept(bool wait)
1105 {
1106   wxSocketBase* sock = new wxSocketBase();
1107
1108   sock->SetFlags(m_flags);
1109
1110   if (!AcceptWith(*sock, wait))
1111   {
1112     sock->Destroy();
1113     sock = NULL;
1114   }
1115
1116   return sock;
1117 }
1118
1119 bool wxSocketServer::WaitForAccept(long seconds, long milliseconds)
1120 {
1121   return _Wait(seconds, milliseconds, GSOCK_CONNECTION_FLAG);
1122 }
1123
1124 // ==========================================================================
1125 // wxSocketClient
1126 // ==========================================================================
1127
1128 // --------------------------------------------------------------------------
1129 // Ctor and dtor
1130 // --------------------------------------------------------------------------
1131
1132 wxSocketClient::wxSocketClient(wxSocketFlags flags)
1133               : wxSocketBase(flags, wxSOCKET_CLIENT)
1134 {
1135 }
1136
1137 wxSocketClient::~wxSocketClient()
1138 {
1139 }
1140
1141 // --------------------------------------------------------------------------
1142 // Connect
1143 // --------------------------------------------------------------------------
1144
1145 bool wxSocketClient::Connect(wxSockAddress& addr_man, bool wait)
1146 {
1147   GSocketError err;
1148
1149   if (m_socket)
1150   {
1151     // Shutdown and destroy the socket
1152     Close();
1153     GSocket_destroy(m_socket);
1154   }
1155
1156   m_socket = GSocket_new();
1157   m_connected = FALSE;
1158   m_establishing = FALSE;
1159
1160   if (!m_socket)
1161     return FALSE;
1162
1163   GSocket_SetTimeout(m_socket, m_timeout * 1000);
1164   GSocket_SetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1165                                 GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1166                                 wx_socket_callback, (char *)this);
1167
1168   // If wait == FALSE, then the call should be nonblocking.
1169   // When we are finished, we put the socket to blocking mode
1170   // again.
1171
1172   if (!wait)
1173     GSocket_SetNonBlocking(m_socket, 1);
1174
1175   GSocket_SetPeer(m_socket, addr_man.GetAddress());
1176   err = GSocket_Connect(m_socket, GSOCK_STREAMED);
1177
1178   if (!wait)
1179     GSocket_SetNonBlocking(m_socket, 0);
1180
1181   if (err != GSOCK_NOERROR)
1182   {
1183     if (err == GSOCK_WOULDBLOCK)
1184       m_establishing = TRUE;
1185
1186     return FALSE;
1187   }
1188
1189   m_connected = TRUE;
1190   return TRUE;
1191 }
1192
1193 bool wxSocketClient::WaitOnConnect(long seconds, long milliseconds)
1194 {
1195   if (m_connected)                      // Already connected
1196     return TRUE;
1197
1198   if (!m_establishing || !m_socket)     // No connection in progress
1199     return FALSE;
1200
1201   return _Wait(seconds, milliseconds, GSOCK_CONNECTION_FLAG |
1202                                       GSOCK_LOST_FLAG);
1203 }
1204
1205 // ==========================================================================
1206 // wxDatagramSocket
1207 // ==========================================================================
1208
1209 /* NOTE: experimental stuff - might change */
1210
1211 wxDatagramSocket::wxDatagramSocket( wxSockAddress& addr,
1212                                     wxSocketFlags flags )
1213                 : wxSocketBase( flags, wxSOCKET_DATAGRAM )
1214 {
1215   // Create the socket
1216   m_socket = GSocket_new();
1217
1218   if(!m_socket)
1219     return;
1220
1221   // Setup the socket as non connection oriented
1222   GSocket_SetLocal(m_socket, addr.GetAddress());
1223   if( GSocket_SetNonOriented(m_socket) != GSOCK_NOERROR )
1224   {
1225     GSocket_destroy(m_socket);
1226     m_socket = NULL;
1227     return;
1228   }
1229
1230   // Initialize all stuff
1231   m_connected = FALSE;
1232   m_establishing = FALSE;
1233   GSocket_SetTimeout( m_socket, m_timeout );
1234   GSocket_SetCallback( m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
1235                                  GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
1236                                  wx_socket_callback, (char*)this );
1237
1238 }
1239
1240 wxDatagramSocket& wxDatagramSocket::RecvFrom( wxSockAddress& addr,
1241                                               void* buf,
1242                                               wxUint32 nBytes )
1243 {
1244     Read(buf, nBytes);
1245     GetPeer(addr);
1246     return (*this);
1247 }
1248
1249 wxDatagramSocket& wxDatagramSocket::SendTo( wxSockAddress& addr,
1250                                             const void* buf,
1251                                             wxUint32 nBytes )
1252 {
1253     GSocket_SetPeer(m_socket, addr.GetAddress());
1254     Write(buf, nBytes);
1255     return (*this);
1256 }
1257
1258 // ==========================================================================
1259 // wxSocketModule
1260 // ==========================================================================
1261
1262 class wxSocketModule : public wxModule
1263 {
1264 public:
1265     virtual bool OnInit()
1266     {
1267         // wxSocketBase will call GSocket_Init() itself when/if needed
1268         return TRUE;
1269     }
1270
1271     virtual void OnExit()
1272     {
1273         if ( wxSocketBase::IsInitialized() )
1274             wxSocketBase::Shutdown();
1275     }
1276
1277 private:
1278     DECLARE_DYNAMIC_CLASS(wxSocketModule)
1279 };
1280
1281 IMPLEMENT_DYNAMIC_CLASS(wxSocketModule, wxModule)
1282
1283 #endif
1284   // wxUSE_SOCKETS
1285
1286 // vi:sts=4:sw=4:et