src/common/sckipc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        sckipc.cpp
   3 // Purpose:     Interprocess communication implementation (wxSocket version)
   4 // Author:      Julian Smart
   5 // Modified by: Guilhem Lavaux (big rewrite) May 1997, 1998
   6 //              Guillermo Rodriguez (updated for wxSocket v2) Jan 2000
   7 //                                  (callbacks deprecated)    Mar 2000
   8 //              Vadim Zeitlin (added support for Unix sockets) Apr 2002
   9 // Created:     1993
  10 // RCS-ID:      $Id$
  11 // Copyright:   (c) Julian Smart 1993
  12 //              (c) Guilhem Lavaux 1997, 1998
  13 //              (c) 2000 Guillermo Rodriguez <guille@iies.es>
  14 // Licence:     wxWindows licence
  15 /////////////////////////////////////////////////////////////////////////////
  16
  17 // ==========================================================================
  18 // declarations
  19 // ==========================================================================
  20
  21 // --------------------------------------------------------------------------
  22 // headers
  23 // --------------------------------------------------------------------------
  24
  25 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  26 #pragma implementation "sckipc.h"
  27 #endif
  28
  29 // For compilers that support precompilation, includes "wx.h".
  30 #include "wx/wxprec.h"
  31
  32 #ifdef __BORLANDC__
  33 #pragma hdrstop
  34 #endif
  35
  36 #ifndef WX_PRECOMP
  37 #include "wx/log.h"
  38 #endif
  39
  40 #if wxUSE_SOCKETS && wxUSE_IPC && wxUSE_STREAMS
  41
  42 #include <stdlib.h>
  43 #include <stdio.h>
  44 #include <errno.h>
  45
  46 #include "wx/socket.h"
  47 #include "wx/sckipc.h"
  48 #include "wx/module.h"
  49 #include "wx/event.h"
  50
  51 // --------------------------------------------------------------------------
  52 // macros and constants
  53 // --------------------------------------------------------------------------
  54
  55 // It seems to be already defined somewhere in the Xt includes.
  56 #ifndef __XT__
  57 // Message codes
  58 enum
  59 {
  60   IPC_EXECUTE = 1,
  61   IPC_REQUEST,
  62   IPC_POKE,
  63   IPC_ADVISE_START,
  64   IPC_ADVISE_REQUEST,
  65   IPC_ADVISE,
  66   IPC_ADVISE_STOP,
  67   IPC_REQUEST_REPLY,
  68   IPC_FAIL,
  69   IPC_CONNECT,
  70   IPC_DISCONNECT
  71 };
  72 #endif
  73
  74 // All sockets will be created with the following flags
  75 #define SCKIPC_FLAGS (wxSOCKET_WAITALL)
  76
  77 // headers needed for umask()
  78 #ifdef __UNIX_LIKE__
  79     #include <sys/types.h>
  80     #include <sys/stat.h>
  81 #endif // __UNIX_LIKE__
  82
  83 // ----------------------------------------------------------------------------
  84 // private functions
  85 // ----------------------------------------------------------------------------
  86
  87 // get the address object for the given server name, the caller must delete it
  88 static wxSockAddress *
  89 GetAddressFromName(const wxString& serverName, const wxString& host = wxEmptyString)
  90 {
  91     // we always use INET sockets under non-Unix systems
  92 #if defined(__UNIX__) && !defined(__WINDOWS__) && !defined(__WXMAC__) && !defined(__WINE__)
  93     // under Unix, if the server name looks like a path, create a AF_UNIX
  94     // socket instead of AF_INET one
  95     if ( serverName.Find(_T('/')) != wxNOT_FOUND )
  96     {
  97         wxUNIXaddress *addr = new wxUNIXaddress;
  98         addr->Filename(serverName);
  99
 100         return addr;
 101     }
 102 #endif // Unix/!Unix
 103     {
 104         wxIPV4address *addr = new wxIPV4address;
 105         addr->Service(serverName);
 106         if ( !host.empty() )
 107         {
 108             addr->Hostname(host);
 109         }
 110
 111         return addr;
 112     }
 113 }
 114
 115 // --------------------------------------------------------------------------
 116 // wxTCPEventHandler stuff (private class)
 117 // --------------------------------------------------------------------------
 118
 119 class wxTCPEventHandler : public wxEvtHandler
 120 {
 121 public:
 122   wxTCPEventHandler() : wxEvtHandler() {}
 123
 124   void Client_OnRequest(wxSocketEvent& event);
 125   void Server_OnRequest(wxSocketEvent& event);
 126
 127   DECLARE_EVENT_TABLE()
 128   DECLARE_NO_COPY_CLASS(wxTCPEventHandler)
 129 };
 130
 131 enum
 132 {
 133   _CLIENT_ONREQUEST_ID = 1000,
 134   _SERVER_ONREQUEST_ID
 135 };
 136
 137 static wxTCPEventHandler *gs_handler = NULL;
 138
 139 // ==========================================================================
 140 // implementation
 141 // ==========================================================================
 142
 143 IMPLEMENT_DYNAMIC_CLASS(wxTCPServer, wxServerBase)
 144 IMPLEMENT_DYNAMIC_CLASS(wxTCPClient, wxClientBase)
 145 IMPLEMENT_CLASS(wxTCPConnection, wxConnectionBase)
 146
 147 // --------------------------------------------------------------------------
 148 // wxTCPClient
 149 // --------------------------------------------------------------------------
 150
 151 wxTCPClient::wxTCPClient () : wxClientBase()
 152 {
 153 }
 154
 155 wxTCPClient::~wxTCPClient ()
 156 {
 157 }
 158
 159 bool wxTCPClient::ValidHost(const wxString& host)
 160 {
 161   wxIPV4address addr;
 162
 163   return addr.Hostname(host);
 164 }
 165
 166 wxConnectionBase *wxTCPClient::MakeConnection (const wxString& host,
 167                                                const wxString& serverName,
 168                                                const wxString& topic)
 169 {
 170   wxSocketClient *client = new wxSocketClient(SCKIPC_FLAGS);
 171   wxSocketStream *stream = new wxSocketStream(*client);
 172   wxDataInputStream *data_is = new wxDataInputStream(*stream);
 173   wxDataOutputStream *data_os = new wxDataOutputStream(*stream);
 174
 175   wxSockAddress *addr = GetAddressFromName(serverName, host);
 176   if ( !addr )
 177       return NULL;
 178
 179   bool ok = client->Connect(*addr);
 180   delete addr;
 181
 182   if ( ok )
 183   {
 184     unsigned char msg;
 185
 186     // Send topic name, and enquire whether this has succeeded
 187     data_os->Write8(IPC_CONNECT);
 188     data_os->WriteString(topic);
 189
 190     msg = data_is->Read8();
 191
 192     // OK! Confirmation.
 193     if (msg == IPC_CONNECT)
 194     {
 195       wxTCPConnection *connection = (wxTCPConnection *)OnMakeConnection ();
 196
 197       if (connection)
 198       {
 199         if (connection->IsKindOf(CLASSINFO(wxTCPConnection)))
 200         {
 201           connection->m_topic = topic;
 202           connection->m_sock  = client;
 203           connection->m_sockstrm = stream;
 204           connection->m_codeci = data_is;
 205           connection->m_codeco = data_os;
 206           client->SetEventHandler(*gs_handler, _CLIENT_ONREQUEST_ID);
 207           client->SetClientData(connection);
 208           client->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 209           client->Notify(true);
 210           return connection;
 211         }
 212         else
 213         {
 214           delete connection;
 215           // and fall through to delete everything else
 216         }
 217       }
 218     }
 219   }
 220
 221   // Something went wrong, delete everything
 222   delete data_is;
 223   delete data_os;
 224   delete stream;
 225   client->Destroy();
 226
 227   return NULL;
 228 }
 229
 230 wxConnectionBase *wxTCPClient::OnMakeConnection()
 231 {
 232   return new wxTCPConnection();
 233 }
 234
 235 // --------------------------------------------------------------------------
 236 // wxTCPServer
 237 // --------------------------------------------------------------------------
 238
 239 wxTCPServer::wxTCPServer () : wxServerBase()
 240 {
 241   m_server = NULL;
 242 }
 243
 244 bool wxTCPServer::Create(const wxString& serverName)
 245 {
 246   // Destroy previous server, if any
 247   if (m_server)
 248   {
 249     m_server->SetClientData(NULL);
 250     m_server->Destroy();
 251     m_server = NULL;
 252   }
 253
 254   wxSockAddress *addr = GetAddressFromName(serverName);
 255   if ( !addr )
 256       return false;
 257
 258 #ifdef __UNIX_LIKE__
 259   mode_t umaskOld;
 260   if ( addr->Type() == wxSockAddress::UNIX )
 261   {
 262       // ensure that the file doesn't exist as otherwise calling socket() would
 263       // fail
 264       int rc = remove(serverName.fn_str());
 265       if ( rc < 0 && errno != ENOENT )
 266       {
 267           delete addr;
 268
 269           return false;
 270       }
 271
 272       // also set the umask to prevent the others from reading our file
 273       umaskOld = umask(077);
 274   }
 275   else
 276   {
 277       // unused anyhow but shut down the compiler warnings
 278       umaskOld = 0;
 279   }
 280 #endif // __UNIX_LIKE__
 281
 282   // Create a socket listening on the specified port
 283   m_server = new wxSocketServer(*addr, SCKIPC_FLAGS);
 284
 285 #ifdef __UNIX_LIKE__
 286   if ( addr->Type() == wxSockAddress::UNIX )
 287   {
 288       // restore the umask
 289       umask(umaskOld);
 290
 291       // save the file name to remove it later
 292       m_filename = serverName;
 293   }
 294 #endif // __UNIX_LIKE__
 295
 296   delete addr;
 297
 298   if (!m_server->Ok())
 299   {
 300     m_server->Destroy();
 301     m_server = NULL;
 302
 303     return false;
 304   }
 305
 306   m_server->SetEventHandler(*gs_handler, _SERVER_ONREQUEST_ID);
 307   m_server->SetClientData(this);
 308   m_server->SetNotify(wxSOCKET_CONNECTION_FLAG);
 309   m_server->Notify(true);
 310
 311   return true;
 312 }
 313
 314 wxTCPServer::~wxTCPServer()
 315 {
 316     if (m_server)
 317     {
 318         m_server->SetClientData(NULL);
 319         m_server->Destroy();
 320     }
 321
 322 #ifdef __UNIX_LIKE__
 323     if ( !m_filename.empty() )
 324     {
 325         if ( remove(m_filename.fn_str()) != 0 )
 326         {
 327             wxLogDebug(_T("Stale AF_UNIX file '%s' left."), m_filename.c_str());
 328         }
 329     }
 330 #endif // __UNIX_LIKE__
 331 }
 332
 333 wxConnectionBase *wxTCPServer::OnAcceptConnection( const wxString& WXUNUSED(topic) )
 334 {
 335   return new wxTCPConnection();
 336 }
 337
 338 // --------------------------------------------------------------------------
 339 // wxTCPConnection
 340 // --------------------------------------------------------------------------
 341
 342 wxTCPConnection::wxTCPConnection () : wxConnectionBase()
 343 {
 344   m_sock     = NULL;
 345   m_sockstrm = NULL;
 346   m_codeci   = NULL;
 347   m_codeco   = NULL;
 348 }
 349
 350 wxTCPConnection::wxTCPConnection(wxChar *buffer, int size)
 351        : wxConnectionBase(buffer, size)
 352 {
 353   m_sock     = NULL;
 354   m_sockstrm = NULL;
 355   m_codeci   = NULL;
 356   m_codeco   = NULL;
 357 }
 358
 359 wxTCPConnection::~wxTCPConnection ()
 360 {
 361   Disconnect();
 362   wxDELETE(m_codeci);
 363   wxDELETE(m_codeco);
 364   wxDELETE(m_sockstrm);
 365
 366   if (m_sock)
 367   {
 368     m_sock->SetClientData(NULL);
 369     m_sock->Destroy();
 370   }
 371 }
 372
 373 void wxTCPConnection::Compress(bool WXUNUSED(on))
 374 {
 375   // Use wxLZWStream
 376 }
 377
 378 // Calls that CLIENT can make.
 379 bool wxTCPConnection::Disconnect ()
 380 {
 381   if ( !GetConnected() )
 382       return true;
 383   // Send the the disconnect message to the peer.
 384   m_codeco->Write8(IPC_DISCONNECT);
 385   m_sock->Notify(false);
 386   m_sock->Close();
 387   SetConnected(false);
 388
 389   return true;
 390 }
 391
 392 bool wxTCPConnection::Execute(const wxChar *data, int size, wxIPCFormat format)
 393 {
 394   if (!m_sock->IsConnected())
 395     return false;
 396
 397   // Prepare EXECUTE message
 398   m_codeco->Write8(IPC_EXECUTE);
 399   m_codeco->Write8(format);
 400
 401   if (size < 0)
 402     size = (wxStrlen(data) + 1) * sizeof(wxChar);    // includes final NUL
 403
 404   m_codeco->Write32(size);
 405   m_sockstrm->Write(data, size);
 406
 407   return true;
 408 }
 409
 410 wxChar *wxTCPConnection::Request (const wxString& item, int *size, wxIPCFormat format)
 411 {
 412   if (!m_sock->IsConnected())
 413     return NULL;
 414
 415   m_codeco->Write8(IPC_REQUEST);
 416   m_codeco->WriteString(item);
 417   m_codeco->Write8(format);
 418
 419   // If Unpack doesn't initialize it.
 420   int ret;
 421
 422   ret = m_codeci->Read8();
 423   if (ret == IPC_FAIL)
 424     return NULL;
 425   else
 426   {
 427     size_t s;
 428
 429     s = m_codeci->Read32();
 430     wxChar *data = GetBufferAtLeast( s );
 431     wxASSERT_MSG(data != NULL,
 432                  _T("Buffer too small in wxTCPConnection::Request") );
 433     m_sockstrm->Read(data, s);
 434
 435     if (size)
 436       *size = s;
 437     return data;
 438   }
 439 }
 440
 441 bool wxTCPConnection::Poke (const wxString& item, wxChar *data, int size, wxIPCFormat format)
 442 {
 443   if (!m_sock->IsConnected())
 444     return false;
 445
 446   m_codeco->Write8(IPC_POKE);
 447   m_codeco->WriteString(item);
 448   m_codeco->Write8(format);
 449
 450   if (size < 0)
 451     size = (wxStrlen(data) + 1) * sizeof(wxChar);    // includes final NUL
 452
 453   m_codeco->Write32(size);
 454   m_sockstrm->Write(data, size);
 455
 456   return true;
 457 }
 458
 459 bool wxTCPConnection::StartAdvise (const wxString& item)
 460 {
 461   int ret;
 462
 463   if (!m_sock->IsConnected())
 464     return false;
 465
 466   m_codeco->Write8(IPC_ADVISE_START);
 467   m_codeco->WriteString(item);
 468
 469   ret = m_codeci->Read8();
 470
 471   if (ret != IPC_FAIL)
 472     return true;
 473   else
 474     return false;
 475 }
 476
 477 bool wxTCPConnection::StopAdvise (const wxString& item)
 478 {
 479   int msg;
 480
 481   if (!m_sock->IsConnected())
 482     return false;
 483
 484   m_codeco->Write8(IPC_ADVISE_STOP);
 485   m_codeco->WriteString(item);
 486
 487   msg = m_codeci->Read8();
 488
 489   if (msg != IPC_FAIL)
 490     return true;
 491   else
 492     return false;
 493 }
 494
 495 // Calls that SERVER can make
 496 bool wxTCPConnection::Advise (const wxString& item,
 497                               wxChar *data, int size, wxIPCFormat format)
 498 {
 499   if (!m_sock->IsConnected())
 500     return false;
 501
 502   m_codeco->Write8(IPC_ADVISE);
 503   m_codeco->WriteString(item);
 504   m_codeco->Write8(format);
 505
 506   if (size < 0)
 507     size = (wxStrlen(data) + 1) * sizeof(wxChar);    // includes final NUL
 508
 509   m_codeco->Write32(size);
 510   m_sockstrm->Write(data, size);
 511
 512   return true;
 513 }
 514
 515 // --------------------------------------------------------------------------
 516 // wxTCPEventHandler (private class)
 517 // --------------------------------------------------------------------------
 518
 519 BEGIN_EVENT_TABLE(wxTCPEventHandler, wxEvtHandler)
 520   EVT_SOCKET(_CLIENT_ONREQUEST_ID, wxTCPEventHandler::Client_OnRequest)
 521   EVT_SOCKET(_SERVER_ONREQUEST_ID, wxTCPEventHandler::Server_OnRequest)
 522 END_EVENT_TABLE()
 523
 524 void wxTCPEventHandler::Client_OnRequest(wxSocketEvent &event)
 525 {
 526   wxSocketBase *sock = event.GetSocket();
 527   wxSocketNotify evt = event.GetSocketEvent();
 528   wxTCPConnection *connection = (wxTCPConnection *)(sock->GetClientData());
 529
 530   // This socket is being deleted; skip this event
 531   if (!connection)
 532     return;
 533
 534   wxDataInputStream *codeci;
 535   wxDataOutputStream *codeco;
 536   wxSocketStream *sockstrm;
 537   wxString topic_name = connection->m_topic;
 538   wxString item;
 539
 540   // We lost the connection: destroy everything
 541   if (evt == wxSOCKET_LOST)
 542   {
 543     sock->Notify(false);
 544     sock->Close();
 545     connection->OnDisconnect();
 546     return;
 547   }
 548
 549   // Receive message number.
 550   codeci = connection->m_codeci;
 551   codeco = connection->m_codeco;
 552   sockstrm = connection->m_sockstrm;
 553   int msg = codeci->Read8();
 554
 555   switch (msg)
 556   {
 557   case IPC_EXECUTE:
 558   {
 559     wxChar *data;
 560     size_t size;
 561     wxIPCFormat format;
 562
 563     format = (wxIPCFormat)codeci->Read8();
 564     size = codeci->Read32();
 565     data = connection->GetBufferAtLeast( size );
 566     wxASSERT_MSG(data != NULL,
 567                  _T("Buffer too small in wxTCPEventHandler::Client_OnRequest") );
 568     sockstrm->Read(data, size);
 569
 570     connection->OnExecute (topic_name, data, size, format);
 571
 572     break;
 573   }
 574   case IPC_ADVISE:
 575   {
 576     wxChar *data;
 577     size_t size;
 578     wxIPCFormat format;
 579
 580     item = codeci->ReadString();
 581     format = (wxIPCFormat)codeci->Read8();
 582     size = codeci->Read32();
 583     data = connection->GetBufferAtLeast( size );
 584     wxASSERT_MSG(data != NULL,
 585                  _T("Buffer too small in wxTCPEventHandler::Client_OnRequest") );
 586     sockstrm->Read(data, size);
 587
 588     connection->OnAdvise (topic_name, item, data, size, format);
 589
 590     break;
 591   }
 592   case IPC_ADVISE_START:
 593   {
 594     item = codeci->ReadString();
 595
 596     bool ok = connection->OnStartAdvise (topic_name, item);
 597     if (ok)
 598       codeco->Write8(IPC_ADVISE_START);
 599     else
 600       codeco->Write8(IPC_FAIL);
 601
 602     break;
 603   }
 604   case IPC_ADVISE_STOP:
 605   {
 606     item = codeci->ReadString();
 607
 608     bool ok = connection->OnStopAdvise (topic_name, item);
 609     if (ok)
 610       codeco->Write8(IPC_ADVISE_STOP);
 611     else
 612       codeco->Write8(IPC_FAIL);
 613
 614     break;
 615   }
 616   case IPC_POKE:
 617   {
 618     wxIPCFormat format;
 619     size_t size;
 620     wxChar *data;
 621
 622     item = codeci->ReadString();
 623     format = (wxIPCFormat)codeci->Read8();
 624     size = codeci->Read32();
 625     data = connection->GetBufferAtLeast( size );
 626     wxASSERT_MSG(data != NULL,
 627                  _T("Buffer too small in wxTCPEventHandler::Client_OnRequest") );
 628     sockstrm->Read(data, size);
 629
 630     connection->OnPoke (topic_name, item, data, size, format);
 631
 632     break;
 633   }
 634   case IPC_REQUEST:
 635   {
 636     wxIPCFormat format;
 637
 638     item = codeci->ReadString();
 639     format = (wxIPCFormat)codeci->Read8();
 640
 641     int user_size = -1;
 642     wxChar *user_data = connection->OnRequest (topic_name, item, &user_size, format);
 643
 644     if (user_data)
 645     {
 646       codeco->Write8(IPC_REQUEST_REPLY);
 647
 648       if (user_size == -1)
 649         user_size = (wxStrlen(user_data) + 1) * sizeof(wxChar);    // includes final NUL
 650
 651       codeco->Write32(user_size);
 652       sockstrm->Write(user_data, user_size);
 653     }
 654     else
 655       codeco->Write8(IPC_FAIL);
 656
 657     break;
 658   }
 659   case IPC_DISCONNECT:
 660   {
 661     sock->Notify(false);
 662     sock->Close();
 663     connection->SetConnected(false);
 664     connection->OnDisconnect();
 665     break;
 666   }
 667   default:
 668     codeco->Write8(IPC_FAIL);
 669     break;
 670   }
 671 }
 672
 673 void wxTCPEventHandler::Server_OnRequest(wxSocketEvent &event)
 674 {
 675   wxSocketServer *server = (wxSocketServer *) event.GetSocket();
 676   wxTCPServer *ipcserv = (wxTCPServer *) server->GetClientData();
 677
 678   // This socket is being deleted; skip this event
 679   if (!ipcserv)
 680     return;
 681
 682   if (event.GetSocketEvent() != wxSOCKET_CONNECTION)
 683     return;
 684
 685   // Accept the connection, getting a new socket
 686   wxSocketBase *sock = server->Accept();
 687   if (!sock->Ok())
 688   {
 689     sock->Destroy();
 690     return;
 691   }
 692
 693   wxSocketStream *stream     = new wxSocketStream(*sock);
 694   wxDataInputStream *codeci  = new wxDataInputStream(*stream);
 695   wxDataOutputStream *codeco = new wxDataOutputStream(*stream);
 696
 697   int msg;
 698   msg = codeci->Read8();
 699
 700   if (msg == IPC_CONNECT)
 701   {
 702     wxString topic_name;
 703     topic_name = codeci->ReadString();
 704
 705     wxTCPConnection *new_connection =
 706          (wxTCPConnection *)ipcserv->OnAcceptConnection (topic_name);
 707
 708     if (new_connection)
 709     {
 710       if (new_connection->IsKindOf(CLASSINFO(wxTCPConnection)))
 711       {
 712         // Acknowledge success
 713         codeco->Write8(IPC_CONNECT);
 714         new_connection->m_topic = topic_name;
 715         new_connection->m_sock = sock;
 716         new_connection->m_sockstrm = stream;
 717         new_connection->m_codeci = codeci;
 718         new_connection->m_codeco = codeco;
 719         sock->SetEventHandler(*gs_handler, _CLIENT_ONREQUEST_ID);
 720         sock->SetClientData(new_connection);
 721         sock->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 722         sock->Notify(true);
 723         return;
 724       }
 725       else
 726       {
 727         delete new_connection;
 728         // and fall through to delete everything else
 729       }
 730     }
 731   }
 732
 733   // Something went wrong, send failure message and delete everything
 734   codeco->Write8(IPC_FAIL);
 735
 736   delete codeco;
 737   delete codeci;
 738   delete stream;
 739   sock->Destroy();
 740 }
 741
 742 // --------------------------------------------------------------------------
 743 // wxTCPEventHandlerModule (private class)
 744 // --------------------------------------------------------------------------
 745
 746 class wxTCPEventHandlerModule: public wxModule
 747 {
 748   DECLARE_DYNAMIC_CLASS(wxTCPEventHandlerModule)
 749
 750 public:
 751   bool OnInit() { gs_handler = new wxTCPEventHandler(); return true; }
 752   void OnExit() { wxDELETE(gs_handler); }
 753 };
 754
 755 IMPLEMENT_DYNAMIC_CLASS(wxTCPEventHandlerModule, wxModule)
 756
 757
 758 #endif
 759     // wxUSE_SOCKETS && wxUSE_IPC