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 // Created:     1993
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) Julian Smart 1993
  10 //              (c) Guilhem Lavaux 1997, 1998
  11 //              (c) 2000 Guillermo Rodriguez <guille@iies.es>
  12 // Licence:     wxWindows license
  13 /////////////////////////////////////////////////////////////////////////////
  14
  15 #ifdef __GNUG__
  16 #pragma implementation "sckipc.h"
  17 #endif
  18
  19 // For compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23 #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27 #include "wx/defs.h"
  28 #endif
  29
  30 #if wxUSE_SOCKETS
  31
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34
  35 #include "wx/socket.h"
  36 #include "wx/sckipc.h"
  37 #include "wx/log.h"
  38
  39 #ifdef __BORLANDC__
  40 #pragma hdrstop
  41 #endif
  42
  43 IMPLEMENT_DYNAMIC_CLASS(wxTCPServer, wxServerBase)
  44 IMPLEMENT_DYNAMIC_CLASS(wxTCPClient, wxClientBase)
  45 IMPLEMENT_CLASS(wxTCPConnection, wxConnectionBase)
  46
  47 // It seems to be already defined somewhere in the Xt includes.
  48 #ifndef __XT__
  49 // Message codes
  50 enum {
  51   IPC_EXECUTE = 1,
  52   IPC_REQUEST,
  53   IPC_POKE,
  54   IPC_ADVISE_START,
  55   IPC_ADVISE_REQUEST,
  56   IPC_ADVISE,
  57   IPC_ADVISE_STOP,
  58   IPC_REQUEST_REPLY,
  59   IPC_FAIL,
  60   IPC_CONNECT,
  61   IPC_DISCONNECT
  62 };
  63 #endif
  64
  65 void Server_OnRequest(wxSocketServer& server,
  66                       wxSocketNotify evt,
  67                       char *cdata);
  68 void Client_OnRequest(wxSocketBase& sock,
  69                       wxSocketNotify evt,
  70                       char *cdata);
  71
  72
  73 // All sockets will be created with the following flags
  74
  75 #define SCKIPC_FLAGS wxSOCKET_NONE
  76
  77 // ---------------------------------------------------------------------------
  78 // wxTCPClient
  79 // ---------------------------------------------------------------------------
  80
  81 wxTCPClient::wxTCPClient ()
  82   : wxClientBase()
  83 {
  84 }
  85
  86 wxTCPClient::~wxTCPClient ()
  87 {
  88 }
  89
  90 bool wxTCPClient::ValidHost(const wxString& host)
  91 {
  92   wxIPV4address addr;
  93
  94   return addr.Hostname(host);
  95 }
  96
  97 wxConnectionBase *wxTCPClient::MakeConnection (const wxString& host,
  98                                                const wxString& server_name,
  99                                                const wxString& topic)
 100 {
 101   wxSocketClient *client = new wxSocketClient(SCKIPC_FLAGS);
 102   wxSocketStream *stream = new wxSocketStream(*client);
 103   wxDataInputStream *data_is = new wxDataInputStream(*stream);
 104   wxDataOutputStream *data_os = new wxDataOutputStream(*stream);
 105
 106   wxIPV4address addr;
 107   addr.Service(server_name);
 108   addr.Hostname(host);
 109
 110   if (client->Connect(addr))
 111   {
 112     unsigned char msg;
 113
 114     // Send topic name, and enquire whether this has succeeded
 115     data_os->Write8(IPC_CONNECT);
 116     data_os->WriteString(topic);
 117
 118     msg = data_is->Read8();
 119
 120     // OK! Confirmation.
 121     if (msg == IPC_CONNECT)
 122     {
 123       wxTCPConnection *connection = (wxTCPConnection *)OnMakeConnection ();
 124
 125       if (connection)
 126       {
 127         if (!connection->IsKindOf(CLASSINFO(wxTCPConnection)))
 128         {
 129           delete connection;
 130           // and fall through to delete everything else
 131         }
 132         else
 133         {
 134           connection->m_topic = topic;
 135           connection->m_sock  = client;
 136           connection->m_sockstrm = stream;
 137           connection->m_codeci = data_is;
 138           connection->m_codeco = data_os;
 139           client->Callback(Client_OnRequest);
 140           client->CallbackData((char *)connection);
 141           client->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 142           client->Notify(TRUE);
 143           return connection;
 144         }
 145       }
 146     }
 147   }
 148
 149   // something went wrong
 150   delete data_is;
 151   delete data_os;
 152   delete stream;
 153   delete client;
 154   return NULL;
 155 }
 156
 157 wxConnectionBase *wxTCPClient::OnMakeConnection()
 158 {
 159   return new wxTCPConnection;
 160 }
 161
 162 // ---------------------------------------------------------------------------
 163 // wxTCPServer
 164 // ---------------------------------------------------------------------------
 165
 166 wxTCPServer::wxTCPServer ()
 167   : wxServerBase()
 168 {
 169 }
 170
 171 bool wxTCPServer::Create(const wxString& server_name)
 172 {
 173   wxSocketServer *server;
 174
 175   // wxIPV4address defaults to INADDR_ANY:0
 176   wxIPV4address addr;
 177   addr.Service(server_name);
 178
 179   // Create a socket listening on specified port
 180   server = new wxSocketServer(addr, SCKIPC_FLAGS);
 181   server->Callback((wxSocketBase::wxSockCbk)Server_OnRequest);
 182   server->CallbackData((char *)this);
 183   server->SetNotify(wxSOCKET_CONNECTION_FLAG);
 184   server->Notify(TRUE);
 185
 186   return TRUE;
 187 }
 188
 189 wxTCPServer::~wxTCPServer()
 190 {
 191 }
 192
 193 wxConnectionBase *wxTCPServer::OnAcceptConnection( const wxString& WXUNUSED(topic) )
 194 {
 195   return new wxTCPConnection();
 196 }
 197
 198 // ---------------------------------------------------------------------------
 199 // wxTCPConnection
 200 // ---------------------------------------------------------------------------
 201
 202 wxTCPConnection::wxTCPConnection ()
 203   : wxConnectionBase(),
 204     m_sock(NULL), m_sockstrm(NULL), m_codeci(NULL), m_codeco(NULL)
 205 {
 206 }
 207
 208 wxTCPConnection::wxTCPConnection(char * WXUNUSED(buffer), int WXUNUSED(size))
 209 {
 210 }
 211
 212 wxTCPConnection::~wxTCPConnection ()
 213 {
 214   wxDELETE(m_sock);
 215   wxDELETE(m_codeci);
 216   wxDELETE(m_codeco);
 217   wxDELETE(m_sockstrm);
 218 }
 219
 220 void wxTCPConnection::Compress(bool WXUNUSED(on))
 221 {
 222   // Use wxLZWStream
 223 }
 224
 225 // Calls that CLIENT can make.
 226 bool wxTCPConnection::Disconnect ()
 227 {
 228   // Send the the disconnect message to the peer.
 229   m_codeco->Write8(IPC_DISCONNECT);
 230   m_sock->Close();
 231
 232   return TRUE;
 233 }
 234
 235 bool wxTCPConnection::Execute(const wxChar *data, int size, wxIPCFormat format)
 236 {
 237   if (!m_sock->IsConnected())
 238     return FALSE;
 239
 240   // Prepare EXECUTE message
 241   m_codeco->Write8(IPC_EXECUTE);
 242   m_codeco->Write8(format);
 243
 244   if (size < 0)
 245     size = strlen(data) + 1;    // includes final NUL
 246
 247   m_codeco->Write32(size);
 248   m_sockstrm->Write(data, size);
 249
 250   return TRUE;
 251 }
 252
 253 char *wxTCPConnection::Request (const wxString& item, int *size, wxIPCFormat format)
 254 {
 255   if (!m_sock->IsConnected())
 256     return NULL;
 257
 258   m_codeco->Write8(IPC_REQUEST);
 259   m_codeco->WriteString(item);
 260   m_codeco->Write8(format);
 261
 262   // If Unpack doesn't initialize it.
 263   int ret;
 264
 265   ret = m_codeci->Read8();
 266   if (ret == IPC_FAIL)
 267     return NULL;
 268   else
 269   {
 270     size_t s;
 271     char *data = NULL;
 272
 273     s = m_codeci->Read32();
 274     data = new char[s];
 275     m_sockstrm->Read(data, s);
 276
 277     if (size)
 278       *size = s;
 279     return data;
 280   }
 281 }
 282
 283 bool wxTCPConnection::Poke (const wxString& item, wxChar *data, int size, wxIPCFormat format)
 284 {
 285   if (!m_sock->IsConnected())
 286     return FALSE;
 287
 288   m_codeco->Write8(IPC_POKE);
 289   m_codeco->WriteString(item);
 290   m_codeco->Write8(format);
 291
 292   if (size < 0)
 293     size = strlen(data) + 1;    // includes final NUL
 294
 295   m_codeco->Write32(size);
 296   m_sockstrm->Write(data, size);
 297
 298   return TRUE;
 299 }
 300
 301 bool wxTCPConnection::StartAdvise (const wxString& item)
 302 {
 303   int ret;
 304
 305   if (!m_sock->IsConnected())
 306     return FALSE;
 307
 308   m_codeco->Write8(IPC_ADVISE_START);
 309   m_codeco->WriteString(item);
 310
 311   ret = m_codeci->Read8();
 312
 313   if (ret != IPC_FAIL)
 314     return TRUE;
 315   else
 316     return FALSE;
 317 }
 318
 319 bool wxTCPConnection::StopAdvise (const wxString& item)
 320 {
 321   int msg;
 322
 323   if (!m_sock->IsConnected())
 324     return FALSE;
 325
 326   m_codeco->Write8(IPC_ADVISE_STOP);
 327   m_codeco->WriteString(item);
 328
 329   msg = m_codeci->Read8();
 330
 331   if (msg != IPC_FAIL)
 332     return TRUE;
 333   else
 334     return FALSE;
 335 }
 336
 337 // Calls that SERVER can make
 338 bool wxTCPConnection::Advise (const wxString& item,
 339                               wxChar *data, int size, wxIPCFormat format)
 340 {
 341   if (!m_sock->IsConnected())
 342     return FALSE;
 343
 344   m_codeco->Write8(IPC_ADVISE);
 345   m_codeco->WriteString(item);
 346   m_codeco->Write8(format);
 347
 348   if (size < 0)
 349     size = strlen(data) + 1;    // includes final NUL
 350
 351   m_codeco->Write32(size);
 352   m_sockstrm->Write(data, size);
 353
 354   return TRUE;
 355 }
 356
 357 void Client_OnRequest(wxSocketBase& sock, wxSocketNotify evt,
 358                       char *cdata)
 359 {
 360   int msg = 0;
 361   wxTCPConnection *connection = (wxTCPConnection *)cdata;
 362   wxDataInputStream *codeci;
 363   wxDataOutputStream *codeco;
 364   wxSocketStream *sockstrm;
 365   wxString topic_name = connection->m_topic;
 366   wxString item;
 367
 368   // The socket handler signals us that we lost the connection: destroy all.
 369   if (evt == wxSOCKET_LOST)
 370   {
 371     sock.Close();
 372     connection->OnDisconnect();
 373     return;
 374   }
 375
 376   // Receive message number.
 377   codeci = connection->m_codeci;
 378   codeco = connection->m_codeco;
 379   sockstrm = connection->m_sockstrm;
 380   msg = codeci->Read8();
 381
 382   switch (msg)
 383   {
 384   case IPC_EXECUTE:
 385   {
 386     char *data;
 387     size_t size;
 388     wxIPCFormat format;
 389
 390     format = (wxIPCFormat)codeci->Read8();
 391     size = codeci->Read32();
 392     data = new char[size];
 393     sockstrm->Read(data, size);
 394
 395     connection->OnExecute (topic_name, data, size, format);
 396
 397     delete [] data;
 398     break;
 399   }
 400   case IPC_ADVISE:
 401   {
 402     char *data;
 403     size_t size;
 404     wxIPCFormat format;
 405
 406     item = codeci->ReadString();
 407     format = (wxIPCFormat)codeci->Read8();
 408     size = codeci->Read32();
 409     data = new char[size];
 410     sockstrm->Read(data, size);
 411
 412     connection->OnAdvise (topic_name, item, data, size, format);
 413
 414     delete [] data;
 415     break;
 416   }
 417   case IPC_ADVISE_START:
 418   {
 419     item = codeci->ReadString();
 420
 421     bool ok = connection->OnStartAdvise (topic_name, item);
 422     if (ok)
 423       codeco->Write8(IPC_ADVISE_START);
 424     else
 425       codeco->Write8(IPC_FAIL);
 426
 427     break;
 428   }
 429   case IPC_ADVISE_STOP:
 430   {
 431     item = codeci->ReadString();
 432
 433     bool ok = connection->OnStopAdvise (topic_name, item);
 434     if (ok)
 435       codeco->Write8(IPC_ADVISE_STOP);
 436     else
 437       codeco->Write8(IPC_FAIL);
 438
 439     break;
 440   }
 441   case IPC_POKE:
 442   {
 443     wxIPCFormat format;
 444     size_t size;
 445     wxChar *data;
 446
 447     item = codeci->ReadString();
 448     format = (wxIPCFormat)codeci->Read8();
 449     size = codeci->Read32();
 450     data = new wxChar[size];
 451     sockstrm->Read(data, size);
 452
 453     connection->OnPoke (topic_name, item, data, size, format);
 454
 455     delete [] data;
 456
 457     break;
 458   }
 459   case IPC_REQUEST:
 460   {
 461     wxIPCFormat format;
 462
 463     item = codeci->ReadString();
 464     format = (wxIPCFormat)codeci->Read8();
 465
 466     int user_size = -1;
 467     char *user_data = connection->OnRequest (topic_name, item, &user_size, format);
 468
 469     if (user_data)
 470     {
 471       codeco->Write8(IPC_REQUEST_REPLY);
 472
 473       if (user_size == -1)
 474         user_size = strlen(user_data) + 1;      // includes final NUL
 475
 476       codeco->Write32(user_size);
 477       sockstrm->Write(user_data, user_size);
 478     }
 479     else
 480       codeco->Write8(IPC_FAIL);
 481
 482     break;
 483   }
 484   case IPC_DISCONNECT:
 485   {
 486     sock.Close();
 487     connection->OnDisconnect();
 488     break;
 489   }
 490   default:
 491     codeco->Write8(IPC_FAIL);
 492     break;
 493   }
 494 }
 495
 496 void Server_OnRequest(wxSocketServer& server,
 497                       wxSocketNotify evt, char *cdata)
 498 {
 499   wxTCPServer *ipcserv = (wxTCPServer *)cdata;
 500   wxSocketStream *stream;
 501   wxDataInputStream *codeci;
 502   wxDataOutputStream *codeco;
 503
 504   if (evt != wxSOCKET_CONNECTION)
 505     return;
 506
 507   /* Accept the connection, getting a new socket */
 508   wxSocketBase *sock = server.Accept();
 509   if (!sock->Ok())
 510     return;
 511
 512   stream = new wxSocketStream(*sock);
 513   codeci = new wxDataInputStream(*stream);
 514   codeco = new wxDataOutputStream(*stream);
 515
 516   int msg;
 517   msg = codeci->Read8();
 518
 519   if (msg == IPC_CONNECT)
 520   {
 521     wxString topic_name;
 522     topic_name = codeci->ReadString();
 523
 524     /* Register new socket with the notifier */
 525     wxTCPConnection *new_connection =
 526          (wxTCPConnection *)ipcserv->OnAcceptConnection (topic_name);
 527     if (new_connection)
 528     {
 529       if (!new_connection->IsKindOf(CLASSINFO(wxTCPConnection)))
 530       {
 531         delete new_connection;
 532         codeco->Write8(IPC_FAIL);
 533         return;
 534       }
 535       // Acknowledge success
 536       codeco->Write8(IPC_CONNECT);
 537       new_connection->m_topic = topic_name;
 538       new_connection->m_sock = sock;
 539       new_connection->m_sockstrm = stream;
 540       new_connection->m_codeci = codeci;
 541       new_connection->m_codeco = codeco;
 542       sock->Callback(Client_OnRequest);
 543       sock->CallbackData((char *)new_connection);
 544       sock->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 545       sock->Notify(TRUE);
 546     }
 547     else
 548     {
 549       // Send failure message
 550       codeco->Write8(IPC_FAIL);
 551     }
 552   }
 553 }
 554
 555 #endif
 556   // wxUSE_SOCKETS