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