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 license
  15 /////////////////////////////////////////////////////////////////////////////
  16
  17 // ==========================================================================
  18 // declarations
  19 // ==========================================================================
  20
  21 // --------------------------------------------------------------------------
  22 // headers
  23 // --------------------------------------------------------------------------
  24
  25 #ifdef __GNUG__
  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 = _T(""))
  90 {
  91     // we always use INET sockets under non-Unix systems
  92 #if defined(__UNIX__) && !defined(__WXMAC__)
  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 };
 129
 130 enum
 131 {
 132   _CLIENT_ONREQUEST_ID = 1000,
 133   _SERVER_ONREQUEST_ID
 134 };
 135
 136 static wxTCPEventHandler *gs_handler = NULL;
 137
 138 // ==========================================================================
 139 // implementation
 140 // ==========================================================================
 141
 142 IMPLEMENT_DYNAMIC_CLASS(wxTCPServer, wxServerBase)
 143 IMPLEMENT_DYNAMIC_CLASS(wxTCPClient, wxClientBase)
 144 IMPLEMENT_CLASS(wxTCPConnection, wxConnectionBase)
 145
 146 // --------------------------------------------------------------------------
 147 // wxTCPClient
 148 // --------------------------------------------------------------------------
 149
 150 wxTCPClient::wxTCPClient () : wxClientBase()
 151 {
 152 }
 153
 154 wxTCPClient::~wxTCPClient ()
 155 {
 156 }
 157
 158 bool wxTCPClient::ValidHost(const wxString& host)
 159 {
 160   wxIPV4address addr;
 161
 162   return addr.Hostname(host);
 163 }
 164
 165 wxConnectionBase *wxTCPClient::MakeConnection (const wxString& host,
 166                                                const wxString& serverName,
 167                                                const wxString& topic)
 168 {
 169   wxSocketClient *client = new wxSocketClient(SCKIPC_FLAGS);
 170   wxSocketStream *stream = new wxSocketStream(*client);
 171   wxDataInputStream *data_is = new wxDataInputStream(*stream);
 172   wxDataOutputStream *data_os = new wxDataOutputStream(*stream);
 173
 174   wxSockAddress *addr = GetAddressFromName(serverName, host);
 175   if ( !addr )
 176       return NULL;
 177
 178   bool ok = client->Connect(*addr);
 179   delete addr;
 180
 181   if ( ok )
 182   {
 183     unsigned char msg;
 184
 185     // Send topic name, and enquire whether this has succeeded
 186     data_os->Write8(IPC_CONNECT);
 187     data_os->WriteString(topic);
 188
 189     msg = data_is->Read8();
 190
 191     // OK! Confirmation.
 192     if (msg == IPC_CONNECT)
 193     {
 194       wxTCPConnection *connection = (wxTCPConnection *)OnMakeConnection ();
 195
 196       if (connection)
 197       {
 198         if (connection->IsKindOf(CLASSINFO(wxTCPConnection)))
 199         {
 200           connection->m_topic = topic;
 201           connection->m_sock  = client;
 202           connection->m_sockstrm = stream;
 203           connection->m_codeci = data_is;
 204           connection->m_codeco = data_os;
 205           client->SetEventHandler(*gs_handler, _CLIENT_ONREQUEST_ID);
 206           client->SetClientData(connection);
 207           client->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 208           client->Notify(TRUE);
 209           return connection;
 210         }
 211         else
 212         {
 213           delete connection;
 214           // and fall through to delete everything else
 215         }
 216       }
 217     }
 218   }
 219
 220   // Something went wrong, delete everything
 221   delete data_is;
 222   delete data_os;
 223   delete stream;
 224   client->Destroy();
 225
 226   return NULL;
 227 }
 228
 229 wxConnectionBase *wxTCPClient::OnMakeConnection()
 230 {
 231   return new wxTCPConnection();
 232 }
 233
 234 // --------------------------------------------------------------------------
 235 // wxTCPServer
 236 // --------------------------------------------------------------------------
 237
 238 wxTCPServer::wxTCPServer () : wxServerBase()
 239 {
 240   m_server = NULL;
 241 }
 242
 243 bool wxTCPServer::Create(const wxString& serverName)
 244 {
 245   // Destroy previous server, if any
 246   if (m_server)
 247   {
 248     m_server->SetClientData(NULL);
 249     m_server->Destroy();
 250     m_server = NULL;
 251   }
 252
 253   wxSockAddress *addr = GetAddressFromName(serverName);
 254   if ( !addr )
 255       return FALSE;
 256
 257 #ifdef __UNIX_LIKE__
 258   mode_t umaskOld;
 259   if ( addr->Type() == wxSockAddress::UNIX )
 260   {
 261       // ensure that the file doesn't exist as otherwise calling socket() would
 262       // fail
 263       int rc = remove(serverName.fn_str());
 264       if ( rc < 0 && errno != ENOENT )
 265       {
 266           delete addr;
 267
 268           return FALSE;
 269       }
 270
 271       // also set the umask to prevent the others from reading our file
 272       umaskOld = umask(077);
 273   }
 274   else
 275   {
 276       // unused anyhow but shut down the compiler warnings
 277       umaskOld = 0;
 278   }
 279 #endif // __UNIX_LIKE__
 280
 281   // Create a socket listening on the specified port
 282   m_server = new wxSocketServer(*addr, SCKIPC_FLAGS);
 283
 284 #ifdef __UNIX_LIKE__
 285   if ( addr->Type() == wxSockAddress::UNIX )
 286   {
 287       // restore the umask
 288       umask(umaskOld);
 289
 290       // save the file name to remove it later
 291       m_filename = serverName;
 292   }
 293 #endif // __UNIX_LIKE__
 294
 295   delete addr;
 296
 297   if (!m_server->Ok())
 298   {
 299     m_server->Destroy();
 300     m_server = NULL;
 301
 302     return FALSE;
 303   }
 304
 305   m_server->SetEventHandler(*gs_handler, _SERVER_ONREQUEST_ID);
 306   m_server->SetClientData(this);
 307   m_server->SetNotify(wxSOCKET_CONNECTION_FLAG);
 308   m_server->Notify(TRUE);
 309
 310   return TRUE;
 311 }
 312
 313 wxTCPServer::~wxTCPServer()
 314 {
 315     if (m_server)
 316     {
 317         m_server->SetClientData(NULL);
 318         m_server->Destroy();
 319     }
 320
 321 #ifdef __UNIX_LIKE__
 322     if ( !m_filename.empty() )
 323     {
 324         if ( remove(m_filename.fn_str()) != 0 )
 325         {
 326             wxLogDebug(_T("Stale AF_UNIX file '%s' left."), m_filename.c_str());
 327         }
 328     }
 329 #endif // __UNIX_LIKE__
 330 }
 331
 332 wxConnectionBase *wxTCPServer::OnAcceptConnection( const wxString& WXUNUSED(topic) )
 333 {
 334   return new wxTCPConnection();
 335 }
 336
 337 // --------------------------------------------------------------------------
 338 // wxTCPConnection
 339 // --------------------------------------------------------------------------
 340
 341 wxTCPConnection::wxTCPConnection () : wxConnectionBase()
 342 {
 343   m_sock     = NULL;
 344   m_sockstrm = NULL;
 345   m_codeci   = NULL;
 346   m_codeco   = NULL;
 347 }
 348
 349 wxTCPConnection::wxTCPConnection(wxChar *buffer, int size)
 350        : wxConnectionBase(buffer, size)
 351 {
 352   m_sock     = NULL;
 353   m_sockstrm = NULL;
 354   m_codeci   = NULL;
 355   m_codeco   = NULL;
 356 }
 357
 358 wxTCPConnection::~wxTCPConnection ()
 359 {
 360   Disconnect();
 361   wxDELETE(m_codeci);
 362   wxDELETE(m_codeco);
 363   wxDELETE(m_sockstrm);
 364
 365   if (m_sock)
 366   {
 367     m_sock->SetClientData(NULL);
 368     m_sock->Destroy();
 369   }
 370 }
 371
 372 void wxTCPConnection::Compress(bool WXUNUSED(on))
 373 {
 374   // Use wxLZWStream
 375 }
 376
 377 // Calls that CLIENT can make.
 378 bool wxTCPConnection::Disconnect ()
 379 {
 380   if ( !GetConnected() )
 381       return TRUE;
 382   // Send the the disconnect message to the peer.
 383   m_codeco->Write8(IPC_DISCONNECT);
 384   m_sock->Notify(FALSE);
 385   m_sock->Close();
 386   SetConnected(false);
 387
 388   return TRUE;
 389 }
 390
 391 bool wxTCPConnection::Execute(const wxChar *data, int size, wxIPCFormat format)
 392 {
 393   if (!m_sock->IsConnected())
 394     return FALSE;
 395
 396   // Prepare EXECUTE message
 397   m_codeco->Write8(IPC_EXECUTE);
 398   m_codeco->Write8(format);
 399
 400   if (size < 0)
 401     size = wxStrlen(data) + 1;    // includes final NUL
 402
 403   m_codeco->Write32(size);
 404   m_sockstrm->Write(data, size);
 405
 406   return TRUE;
 407 }
 408
 409 char *wxTCPConnection::Request (const wxString& item, int *size, wxIPCFormat format)
 410 {
 411   if (!m_sock->IsConnected())
 412     return NULL;
 413
 414   m_codeco->Write8(IPC_REQUEST);
 415   m_codeco->WriteString(item);
 416   m_codeco->Write8(format);
 417
 418   // If Unpack doesn't initialize it.
 419   int ret;
 420
 421   ret = m_codeci->Read8();
 422   if (ret == IPC_FAIL)
 423     return NULL;
 424   else
 425   {
 426     size_t s;
 427
 428     s = m_codeci->Read32();
 429     wxChar *data = GetBufferAtLeast( s );
 430     wxASSERT_MSG(data != NULL,
 431                  _T("Buffer too small in wxTCPConnection::Request") );
 432     m_sockstrm->Read(data, s);
 433
 434     if (size)
 435       *size = s;
 436     return data;
 437   }
 438 }
 439
 440 bool wxTCPConnection::Poke (const wxString& item, wxChar *data, int size, wxIPCFormat format)
 441 {
 442   if (!m_sock->IsConnected())
 443     return FALSE;
 444
 445   m_codeco->Write8(IPC_POKE);
 446   m_codeco->WriteString(item);
 447   m_codeco->Write8(format);
 448
 449   if (size < 0)
 450     size = wxStrlen(data) + 1;    // includes final NUL
 451
 452   m_codeco->Write32(size);
 453   m_sockstrm->Write(data, size);
 454
 455   return TRUE;
 456 }
 457
 458 bool wxTCPConnection::StartAdvise (const wxString& item)
 459 {
 460   int ret;
 461
 462   if (!m_sock->IsConnected())
 463     return FALSE;
 464
 465   m_codeco->Write8(IPC_ADVISE_START);
 466   m_codeco->WriteString(item);
 467
 468   ret = m_codeci->Read8();
 469
 470   if (ret != IPC_FAIL)
 471     return TRUE;
 472   else
 473     return FALSE;
 474 }
 475
 476 bool wxTCPConnection::StopAdvise (const wxString& item)
 477 {
 478   int msg;
 479
 480   if (!m_sock->IsConnected())
 481     return FALSE;
 482
 483   m_codeco->Write8(IPC_ADVISE_STOP);
 484   m_codeco->WriteString(item);
 485
 486   msg = m_codeci->Read8();
 487
 488   if (msg != IPC_FAIL)
 489     return TRUE;
 490   else
 491     return FALSE;
 492 }
 493
 494 // Calls that SERVER can make
 495 bool wxTCPConnection::Advise (const wxString& item,
 496                               wxChar *data, int size, wxIPCFormat format)
 497 {
 498   if (!m_sock->IsConnected())
 499     return FALSE;
 500
 501   m_codeco->Write8(IPC_ADVISE);
 502   m_codeco->WriteString(item);
 503   m_codeco->Write8(format);
 504
 505   if (size < 0)
 506     size = wxStrlen(data) + 1;    // includes final NUL
 507
 508   m_codeco->Write32(size);
 509   m_sockstrm->Write(data, size);
 510
 511   return TRUE;
 512 }
 513
 514 // --------------------------------------------------------------------------
 515 // wxTCPEventHandler (private class)
 516 // --------------------------------------------------------------------------
 517
 518 BEGIN_EVENT_TABLE(wxTCPEventHandler, wxEvtHandler)
 519   EVT_SOCKET(_CLIENT_ONREQUEST_ID, wxTCPEventHandler::Client_OnRequest)
 520   EVT_SOCKET(_SERVER_ONREQUEST_ID, wxTCPEventHandler::Server_OnRequest)
 521 END_EVENT_TABLE()
 522
 523 void wxTCPEventHandler::Client_OnRequest(wxSocketEvent &event)
 524 {
 525   wxSocketBase *sock = event.GetSocket();
 526   wxSocketNotify evt = event.GetSocketEvent();
 527   wxTCPConnection *connection = (wxTCPConnection *)(sock->GetClientData());
 528
 529   // This socket is being deleted; skip this event
 530   if (!connection)
 531     return;
 532
 533   int msg = 0;
 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   msg = codeci->Read8();
 554
 555   switch (msg)
 556   {
 557   case IPC_EXECUTE:
 558   {
 559     char *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     char *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     char *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 = strlen(user_data) + 1;      // 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 WXDLLEXPORT 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