src/msw/gsocket.c

   1 /* -------------------------------------------------------------------------
   2  * Project: GSocket (Generic Socket) for WX
   3  * Name:    gsocket.c
   4  * Purpose: GSocket main MSW file
   5  * CVSID:   $Id$
   6  * -------------------------------------------------------------------------
   7  */
   8
   9 #if defined(__GSOCKET_STANDALONE__) || defined(wxUSE_SOCKETS)
  10
  11 #ifndef __GSOCKET_STANDALONE__
  12
  13 #include "wx/setup.h"
  14 #include "wx/msw/gsockmsw.h"
  15 #include "wx/gsocket.h"
  16
  17 #define INSTANCE wxhInstance
  18
  19 #else
  20
  21 #include "gsockmsw.h"
  22 #include "gsocket.h"
  23
  24 /* If not using wxWindows, a global var called hInst must
  25  * be available and it must containt the app's instance
  26  * handle.
  27  */
  28 #define INSTANCE hInst
  29
  30 #endif /* __GSOCKET_STANDALONE__ */
  31
  32
  33 #include <assert.h>
  34 #include <string.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stddef.h>
  38 #include <ctype.h>
  39 #include <winsock.h>
  40
  41 #define SOCKLEN_T  int
  42 #define CLASSNAME  "_GSocket_Internal_Window_Class"
  43 #define WINDOWNAME "_GSocket_Internal_Window_Name"
  44
  45 /* Maximum number of different GSocket objects at a given time.
  46  * This value can be modified at will, but it CANNOT be greater
  47  * than (0x7FFF - WM_USER + 1)
  48  */
  49 #define MAXSOCKETS 1024
  50
  51 #if (MAXSOCKETS > (0x7FFF - WM_USER + 1))
  52 #error "MAXSOCKETS is too big!"
  53 #endif
  54
  55
  56 /* Global variables */
  57
  58 extern HINSTANCE INSTANCE;
  59 static HWND hWin;
  60 static CRITICAL_SECTION critical;
  61 static GSocket* socketList[MAXSOCKETS];
  62 static int firstAvailable;
  63
  64 /* Global initializers */
  65
  66 bool GSocket_Init()
  67 {
  68   WSADATA wsaData;
  69   WNDCLASS winClass;
  70   int i;
  71
  72   /* Create internal window for event notifications */
  73   winClass.style         = 0;
  74   winClass.lpfnWndProc   = _GSocket_Internal_WinProc;
  75   winClass.cbClsExtra    = 0;
  76   winClass.cbWndExtra    = 0;
  77   winClass.hInstance     = INSTANCE;
  78   winClass.hIcon         = (HICON) NULL;
  79   winClass.hCursor       = (HCURSOR) NULL;
  80   winClass.hbrBackground = (HBRUSH) NULL;
  81   winClass.lpszMenuName  = (LPCTSTR) NULL;
  82   winClass.lpszClassName = CLASSNAME;
  83
  84   RegisterClass(&winClass);
  85   hWin = CreateWindow(CLASSNAME,
  86                       WINDOWNAME,
  87                       0, 0, 0, 0, 0,
  88                       (HWND) NULL, (HMENU) NULL, INSTANCE, (LPVOID) NULL);
  89
  90   if (!hWin) return FALSE;
  91
  92   /* Initialize socket list */
  93   InitializeCriticalSection(&critical);
  94
  95   for (i = 0; i < MAXSOCKETS; i++)
  96   {
  97     socketList[i] = NULL;
  98   }
  99   firstAvailable = 0;
 100
 101   /* Initialize WinSocket */
 102   return (WSAStartup((1 << 8) | 1, &wsaData) == 0);
 103 }
 104
 105 void GSocket_Cleanup()
 106 {
 107   /* Destroy internal window */
 108   DestroyWindow(hWin);
 109   UnregisterClass(CLASSNAME, INSTANCE);
 110
 111   /* Delete critical section */
 112   DeleteCriticalSection(&critical);
 113
 114   /* Cleanup WinSocket */
 115   WSACleanup();
 116 }
 117
 118 /* Constructors / Destructors */
 119
 120 GSocket *GSocket_new()
 121 {
 122   int i;
 123   GSocket *socket;
 124
 125   if ((socket = (GSocket *) malloc(sizeof(GSocket))) == NULL)
 126     return NULL;
 127
 128   socket->m_fd              = INVALID_SOCKET;
 129   for (i = 0; i < GSOCK_MAX_EVENT; i++)
 130   {
 131     socket->m_cbacks[i]     = NULL;
 132   }
 133   socket->m_local           = NULL;
 134   socket->m_peer            = NULL;
 135   socket->m_error           = GSOCK_NOERROR;
 136   socket->m_server          = FALSE;
 137   socket->m_stream          = TRUE;
 138   socket->m_non_blocking    = FALSE;
 139   socket->m_timeout.tv_sec  = 10 * 60;  /* 10 minutes */
 140   socket->m_timeout.tv_usec = 0;
 141
 142   /* Allocate a new message number for this socket */
 143   EnterCriticalSection(&critical);
 144
 145   i = firstAvailable;
 146   while (socketList[i] != NULL)
 147   {
 148     i = (i + 1) % MAXSOCKETS;
 149
 150     if (i == firstAvailable)    /* abort! */
 151     {
 152       free(socket);
 153       LeaveCriticalSection(&critical);
 154       return NULL;
 155     }
 156   }
 157   socketList[i] = socket;
 158   firstAvailable = (i + 1) % MAXSOCKETS;
 159   socket->m_msgnumber = (i + WM_USER);
 160
 161   LeaveCriticalSection(&critical);
 162
 163   return socket;
 164 }
 165
 166 void GSocket_destroy(GSocket *socket)
 167 {
 168   assert(socket != NULL);
 169
 170   /* We don't want more event notifications; so first of all we
 171    * remove the socket from the list (NOTE: we won't get a CLOSE
 172    * event for this socket if it wasn't closed before).
 173    */
 174   EnterCriticalSection(&critical);
 175   socketList[(socket->m_msgnumber - WM_USER)] = NULL;
 176   LeaveCriticalSection(&critical);
 177
 178   /* We check that the socket is really shutdowned */
 179   if (socket->m_fd != INVALID_SOCKET)
 180     GSocket_Shutdown(socket);
 181
 182   /* We destroy private addresses */
 183   if (socket->m_local)
 184     GAddress_destroy(socket->m_local);
 185
 186   if (socket->m_peer)
 187     GAddress_destroy(socket->m_peer);
 188
 189   /* We destroy socket itself */
 190   free(socket);
 191 }
 192
 193 void GSocket_Shutdown(GSocket *socket)
 194 {
 195   int evt;
 196
 197   assert(socket != NULL);
 198
 199   /* If socket has been created, we shutdown it */
 200   if (socket->m_fd != INVALID_SOCKET)
 201   {
 202     shutdown(socket->m_fd, 2);
 203     closesocket(socket->m_fd);
 204     socket->m_fd = INVALID_SOCKET;
 205   }
 206
 207   /* We disable GUI callbacks */
 208   for (evt = 0; evt < GSOCK_MAX_EVENT; evt++)
 209   {
 210     socket->m_cbacks[evt] = NULL;
 211   }
 212
 213   _GSocket_Configure_Callbacks(socket);
 214 }
 215
 216 /* Address handling */
 217
 218 GSocketError GSocket_SetLocal(GSocket *socket, GAddress *address)
 219 {
 220   assert(socket != NULL);
 221
 222   if (socket->m_fd != INVALID_SOCKET && !socket->m_server)
 223   {
 224     socket->m_error = GSOCK_INVSOCK;
 225     return GSOCK_INVSOCK;
 226   }
 227
 228   if (address == NULL || address->m_family == GSOCK_NOFAMILY)
 229   {
 230     socket->m_error = GSOCK_INVADDR;
 231     return GSOCK_INVADDR;
 232   }
 233
 234   if (socket->m_local)
 235     GAddress_destroy(socket->m_local);
 236
 237   socket->m_local = GAddress_copy(address);
 238
 239   return GSOCK_NOERROR;
 240 }
 241
 242 GSocketError GSocket_SetPeer(GSocket *socket, GAddress *address)
 243 {
 244   assert(socket != NULL);
 245
 246   if (address == NULL || address->m_family == GSOCK_NOFAMILY)
 247   {
 248     socket->m_error = GSOCK_INVADDR;
 249     return GSOCK_INVADDR;
 250   }
 251
 252   if (socket->m_peer)
 253     GAddress_destroy(socket->m_peer);
 254
 255   socket->m_peer = GAddress_copy(address);
 256
 257   return GSOCK_NOERROR;
 258 }
 259
 260 GAddress *GSocket_GetLocal(GSocket *socket)
 261 {
 262   GAddress *address;
 263   struct sockaddr addr;
 264   SOCKLEN_T size;
 265
 266   assert(socket != NULL);
 267
 268   if (socket->m_local)
 269     return GAddress_copy(socket->m_local);
 270
 271   if (socket->m_fd == INVALID_SOCKET)
 272   {
 273     socket->m_error = GSOCK_INVSOCK;
 274     return NULL;
 275   }
 276
 277   size = sizeof(addr);
 278
 279   if (getsockname(socket->m_fd, &addr, &size) == SOCKET_ERROR)
 280   {
 281     socket->m_error = GSOCK_IOERR;
 282     return NULL;
 283   }
 284
 285   address = GAddress_new();
 286   if (address == NULL)
 287   {
 288      socket->m_error = GSOCK_MEMERR;
 289      return NULL;
 290   }
 291   if (_GAddress_translate_from(address, &addr, size) != GSOCK_NOERROR)
 292   {
 293      socket->m_error = GSOCK_MEMERR;
 294      GAddress_destroy(address);
 295      return NULL;
 296   }
 297
 298   return address;
 299 }
 300
 301 GAddress *GSocket_GetPeer(GSocket *socket)
 302 {
 303   assert(socket != NULL);
 304
 305   if (socket->m_peer)
 306     return GAddress_copy(socket->m_peer);
 307
 308   return NULL;
 309 }
 310
 311 /* Server specific parts */
 312
 313 /* GSocket_SetServer:
 314  *  Sets up the socket as a server. It uses the "Local" field of GSocket.
 315  *  "Local" must be set by GSocket_SetLocal() before GSocket_SetServer()
 316  *  is called. Possible error codes are: GSOCK_INVSOCK if socket has not
 317  *  been initialized, GSOCK_INVADDR if the local address has not been
 318  *  defined and GSOCK_IOERR for other internal errors.
 319  */
 320 GSocketError GSocket_SetServer(GSocket *sck)
 321 {
 322   u_long arg = 1;
 323
 324   assert(sck != NULL);
 325
 326   if (sck->m_fd != INVALID_SOCKET)
 327   {
 328     sck->m_error = GSOCK_INVSOCK;
 329     return GSOCK_INVSOCK;
 330   }
 331
 332   if (!sck->m_local)
 333   {
 334     sck->m_error = GSOCK_INVADDR;
 335     return GSOCK_INVADDR;
 336   }
 337
 338   /* Initialize all fields */
 339   sck->m_server   = TRUE;
 340   sck->m_stream   = TRUE;
 341   sck->m_oriented = TRUE;
 342
 343   /* Create the socket */
 344   sck->m_fd = socket(sck->m_local->m_realfamily, SOCK_STREAM, 0);
 345
 346   if (sck->m_fd == INVALID_SOCKET)
 347   {
 348     sck->m_error = GSOCK_IOERR;
 349     return GSOCK_IOERR;
 350   }
 351
 352   ioctlsocket(sck->m_fd, FIONBIO, (u_long FAR *) &arg);
 353   _GSocket_Configure_Callbacks(sck);
 354
 355   /* Bind the socket to the LOCAL address */
 356   if (bind(sck->m_fd, sck->m_local->m_addr, sck->m_local->m_len) != 0)
 357   {
 358     closesocket(sck->m_fd);
 359     sck->m_fd = INVALID_SOCKET;
 360     sck->m_error = GSOCK_IOERR;
 361     return GSOCK_IOERR;
 362   }
 363
 364   /* Enable listening up to 5 connections */
 365   if (listen(sck->m_fd, 5) != 0)
 366   {
 367     closesocket(sck->m_fd);
 368     sck->m_fd = INVALID_SOCKET;
 369     sck->m_error = GSOCK_IOERR;
 370     return GSOCK_IOERR;
 371   }
 372
 373   return GSOCK_NOERROR;
 374 }
 375
 376 /* GSocket_WaitConnection:
 377  *  Waits for an incoming client connection.
 378  */
 379 GSocket *GSocket_WaitConnection(GSocket *sck)
 380 {
 381   GSocket *connection;
 382   u_long arg = 1;
 383
 384   assert(sck != NULL);
 385
 386   /* If the socket has already been created, we exit immediately */
 387   if (sck->m_fd == INVALID_SOCKET || !sck->m_server)
 388   {
 389     sck->m_error = GSOCK_INVSOCK;
 390     return NULL;
 391   }
 392
 393   /* Create a GSocket object for the new connection */
 394   connection = GSocket_new();
 395
 396   if (!connection)
 397   {
 398     sck->m_error = GSOCK_MEMERR;
 399     return NULL;
 400   }
 401
 402   /* Wait for a connection (with timeout) */
 403   if (_GSocket_Input_Timeout(sck) == GSOCK_TIMEDOUT)
 404   {
 405     GSocket_destroy(connection);
 406     /* sck->m_error set by _GSocket_Input_Timeout */
 407     return NULL;
 408   }
 409
 410   connection->m_fd = accept(sck->m_fd, NULL, NULL);
 411
 412   if (connection->m_fd == INVALID_SOCKET)
 413   {
 414     if (WSAGetLastError() == WSAEWOULDBLOCK)
 415       sck->m_error = GSOCK_WOULDBLOCK;
 416     else
 417       sck->m_error = GSOCK_IOERR;
 418
 419     GSocket_destroy(connection);
 420     return NULL;
 421   }
 422
 423   /* Initialize all fields */
 424   connection->m_server   = FALSE;
 425   connection->m_stream   = TRUE;
 426   connection->m_oriented = TRUE;
 427
 428   ioctlsocket(connection->m_fd, FIONBIO, (u_long FAR *) &arg);
 429   _GSocket_Configure_Callbacks(connection);
 430
 431   return connection;
 432 }
 433
 434 /* Non oriented connections */
 435
 436 GSocketError GSocket_SetNonOriented(GSocket *sck)
 437 {
 438   u_long arg = 1;
 439
 440   assert(sck != NULL);
 441
 442   if (sck->m_fd != INVALID_SOCKET)
 443   {
 444     sck->m_error = GSOCK_INVSOCK;
 445     return GSOCK_INVSOCK;
 446   }
 447
 448   if (!sck->m_local)
 449   {
 450     sck->m_error = GSOCK_INVADDR;
 451     return GSOCK_INVADDR;
 452   }
 453
 454   /* Initialize all fields */
 455   sck->m_stream   = FALSE;
 456   sck->m_server   = FALSE;
 457   sck->m_oriented = FALSE;
 458
 459   /* Create the socket */
 460   sck->m_fd = socket(sck->m_local->m_realfamily, SOCK_DGRAM, 0);
 461
 462   if (sck->m_fd == INVALID_SOCKET)
 463   {
 464     sck->m_error = GSOCK_IOERR;
 465     return GSOCK_IOERR;
 466   }
 467
 468   ioctlsocket(sck->m_fd, FIONBIO, (u_long FAR *) &arg);
 469   _GSocket_Configure_Callbacks(sck);
 470
 471   /* Bind it to the LOCAL address */
 472   if (bind(sck->m_fd, sck->m_local->m_addr, sck->m_local->m_len) != 0)
 473   {
 474     closesocket(sck->m_fd);
 475     sck->m_fd    = INVALID_SOCKET;
 476     sck->m_error = GSOCK_IOERR;
 477     return GSOCK_IOERR;
 478   }
 479
 480   return GSOCK_NOERROR;
 481 }
 482
 483 GSocketError GSocket_SetBroadcast(GSocket *sck)
 484 {
 485   BOOL b;
 486
 487   assert(sck != NULL);
 488
 489   if (GSocket_SetNonOriented(sck) != GSOCK_NOERROR)
 490     return sck->m_error;
 491
 492   b = TRUE;
 493   setsockopt(sck->m_fd, SOL_SOCKET, SO_BROADCAST, (const char FAR *) &b, sizeof(b));
 494
 495   return GSOCK_NOERROR;
 496 }
 497
 498 /* Client specific parts */
 499
 500 /* GSocket_Connect:
 501  *  Establishes a client connection to a server using the "Peer"
 502  *  field of GSocket. "Peer" must be set by GSocket_SetPeer() before
 503  *  GSocket_Connect() is called. Possible error codes are GSOCK_INVSOCK,
 504  *  GSOCK_INVADDR, GSOCK_TIMEDOUT, GSOCK_WOULDBLOCK and GSOCK_IOERR.
 505  *  If a socket is nonblocking and Connect() returns GSOCK_WOULDBLOCK,
 506  *  the connection request can be completed later. Use GSocket_Select()
 507  *  to check or wait for a GSOCK_CONNECTION event.
 508  */
 509 GSocketError GSocket_Connect(GSocket *sck, GSocketStream stream)
 510 {
 511   u_long arg = 1;
 512   int type, ret, err;
 513
 514   assert(sck != NULL);
 515
 516   if (sck->m_fd != INVALID_SOCKET)
 517   {
 518     sck->m_error = GSOCK_INVSOCK;
 519     return GSOCK_INVSOCK;
 520   }
 521
 522   if (!sck->m_peer)
 523   {
 524     sck->m_error = GSOCK_INVADDR;
 525     return GSOCK_INVADDR;
 526   }
 527
 528   /* Test whether we want the socket to be a stream (e.g. TCP) */
 529   sck->m_stream   = (stream == GSOCK_STREAMED);
 530   sck->m_oriented = TRUE;
 531   sck->m_server   = FALSE;
 532
 533   if (sck->m_stream)
 534     type = SOCK_STREAM;
 535   else
 536     type = SOCK_DGRAM;
 537
 538   /* Create the socket */
 539   sck->m_fd = socket(sck->m_peer->m_realfamily, type, 0);
 540
 541   if (sck->m_fd == INVALID_SOCKET)
 542   {
 543     sck->m_error = GSOCK_IOERR;
 544     return GSOCK_IOERR;
 545   }
 546
 547   ioctlsocket(sck->m_fd, FIONBIO, (u_long FAR *) &arg);
 548   _GSocket_Configure_Callbacks(sck);
 549
 550   /* Connect it to the PEER address, with a timeout (see below) */
 551   ret = connect(sck->m_fd, sck->m_peer->m_addr, sck->m_peer->m_len);
 552
 553   if (ret == SOCKET_ERROR)
 554   {
 555     err = WSAGetLastError();
 556
 557     /* If connect failed with EWOULDBLOCK and the GSocket object
 558      * is in blocking mode, we select() for the specified timeout
 559      * checking for writability to see if the connection request
 560      * completes.
 561      */
 562     if ((err == WSAEWOULDBLOCK) && (!sck->m_non_blocking))
 563     {
 564       if (_GSocket_Output_Timeout(sck) == GSOCK_TIMEDOUT)
 565       {
 566         closesocket(sck->m_fd);
 567         sck->m_fd = INVALID_SOCKET;
 568         /* sck->m_error is set in _GSocket_Output_Timeout */
 569         return GSOCK_TIMEDOUT;
 570       }
 571       else
 572         return GSOCK_NOERROR;
 573     }
 574
 575     /* If connect failed with EWOULDBLOCK and the GSocket object
 576      * is set to nonblocking, we set m_error to GSOCK_WOULDBLOCK
 577      * (and return GSOCK_WOULDBLOCK) but we don't close the socket;
 578      * this way if the connection completes, a GSOCK_CONNECTION
 579      * event will be generated, if enabled.
 580      */
 581     if ((err == WSAEWOULDBLOCK) && (sck->m_non_blocking))
 582     {
 583       sck->m_error = GSOCK_WOULDBLOCK;
 584       return GSOCK_WOULDBLOCK;
 585     }
 586
 587     /* If connect failed with an error other than EWOULDBLOCK,
 588      * then the call to GSocket_Connect has failed.
 589      */
 590     closesocket(sck->m_fd);
 591     sck->m_fd = INVALID_SOCKET;
 592     sck->m_error = GSOCK_IOERR;
 593     return GSOCK_IOERR;
 594   }
 595
 596   return GSOCK_NOERROR;
 597 }
 598
 599 /* Generic IO */
 600
 601 /* Like recv(), send(), ... */
 602 int GSocket_Read(GSocket *socket, char *buffer, int size)
 603 {
 604   assert(socket != NULL);
 605
 606   if (socket->m_fd == INVALID_SOCKET || socket->m_server)
 607   {
 608     socket->m_error = GSOCK_INVSOCK;
 609     return -1;
 610   }
 611
 612   if (_GSocket_Input_Timeout(socket) == GSOCK_TIMEDOUT)
 613     return -1;
 614
 615   if (socket->m_stream)
 616     return _GSocket_Recv_Stream(socket, buffer, size);
 617   else
 618     return _GSocket_Recv_Dgram(socket, buffer, size);
 619 }
 620
 621 int GSocket_Write(GSocket *socket, const char *buffer, int size)
 622 {
 623   assert(socket != NULL);
 624
 625   if (socket->m_fd == INVALID_SOCKET || socket->m_server)
 626   {
 627     socket->m_error = GSOCK_INVSOCK;
 628     return -1;
 629   }
 630
 631   if (_GSocket_Output_Timeout(socket) == GSOCK_TIMEDOUT)
 632     return -1;
 633
 634   if (socket->m_stream)
 635     return _GSocket_Send_Stream(socket, buffer, size);
 636   else
 637     return _GSocket_Send_Dgram(socket, buffer, size);
 638 }
 639
 640 /* GSocket_Select:
 641  *  Polls the socket to determine its status. This function will
 642  *  check for the events specified in the 'flags' parameter, and
 643  *  it will return a mask indicating which operations can be
 644  *  performed. This function won't block, regardless of the
 645  *  mode (blocking|nonblocking) of the socket.
 646  */
 647 GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags)
 648 {
 649   fd_set readfds, writefds, exceptfds;
 650   struct timeval tv;
 651   GSocketEventFlags mask;
 652
 653   assert(socket != NULL);
 654
 655   if (socket->m_fd == INVALID_SOCKET)
 656   {
 657     socket->m_error = GSOCK_INVSOCK;
 658     return FALSE;
 659   }
 660
 661   FD_ZERO(&readfds);
 662   FD_ZERO(&writefds);
 663   FD_ZERO(&exceptfds);
 664   FD_SET(socket->m_fd, &readfds);
 665   FD_SET(socket->m_fd, &writefds);
 666   FD_SET(socket->m_fd, &exceptfds);
 667
 668   tv.tv_sec = 0;
 669   tv.tv_usec = 0;
 670   select(socket->m_fd + 1, &readfds, &writefds, &exceptfds, &tv);
 671
 672   mask = 0;
 673
 674   /* If select() says that the socket is readable, then we have
 675    * no way to distinguish if that means 'data available' (to
 676    * recv) or 'incoming connection' (to accept). The same goes
 677    * for writability: we cannot distinguish between 'you can
 678    * send data' and 'connection request completed'. So we will
 679    * assume the following: if the flag was set upon entry,
 680    * that means that the event was possible.
 681    */
 682   if (FD_ISSET(socket->m_fd, &readfds))
 683   {
 684     mask |= (flags & GSOCK_CONNECTION_FLAG);
 685     mask |= (flags & GSOCK_INPUT_FLAG);
 686   }
 687   if (FD_ISSET(socket->m_fd, &writefds))
 688   {
 689     mask |= (flags & GSOCK_CONNECTION_FLAG);
 690     mask |= (flags & GSOCK_OUTPUT_FLAG);
 691   }
 692   if (FD_ISSET(socket->m_fd, &exceptfds))
 693     mask |= (flags & GSOCK_LOST_FLAG);
 694
 695   return mask;
 696 }
 697
 698 /* Flags */
 699
 700 /* GSocket_SetNonBlocking:
 701  *  Sets the socket to non-blocking mode. This is useful if
 702  *  we don't want to wait.
 703  */
 704 void GSocket_SetNonBlocking(GSocket *socket, bool non_block)
 705 {
 706   assert(socket != NULL);
 707
 708   socket->m_non_blocking = non_block;
 709 }
 710
 711 /* GSocket_SetTimeout:
 712  *  Sets the timeout for blocking calls. Time is
 713  *  expressed in milliseconds.
 714  */
 715 void GSocket_SetTimeout(GSocket *socket, unsigned long millisecs)
 716 {
 717   assert(socket != NULL);
 718
 719   socket->m_timeout.tv_sec  = (millisecs / 1000);
 720   socket->m_timeout.tv_usec = (millisecs % 1000) * 1000;
 721 }
 722
 723 /* GSocket_GetError:
 724  *  Returns the last error occured for this socket.
 725  */
 726 GSocketError GSocket_GetError(GSocket *socket)
 727 {
 728   assert(socket != NULL);
 729
 730   return socket->m_error;
 731 }
 732
 733 /* Callbacks */
 734
 735 /* Only one callback is possible for each event (INPUT, OUTPUT, CONNECTION
 736  * and LOST). The callbacks are called in the following situations:
 737  *
 738  * INPUT: There is at least one byte in the input buffer
 739  * OUTPUT: The system is sure that the next write call will not block
 740  * CONNECTION: Two cases are possible:
 741  *           Client socket -> the connection is established
 742  *           Server socket -> a client requests a connection
 743  * LOST: The connection is lost
 744  *
 745  * An event is generated only once and its state is reseted when the
 746  * relative IO call is requested.
 747  * For example: INPUT -> GSocket_Read()
 748  *              CONNECTION -> GSocket_Accept()
 749  */
 750
 751 /* GSocket_SetCallback:
 752  *  Enables the callbacks specified by 'flags'. Note that 'flags'
 753  *  may be a combination of flags OR'ed toghether, so the same
 754  *  callback function can be made to accept different events.
 755  *  The callback function must have the following prototype:
 756  *
 757  *  void function(GSocket *socket, GSocketEvent event, char *cdata)
 758  */
 759 void GSocket_SetCallback(GSocket *socket, GSocketEventFlags flags,
 760                          GSocketCallback callback, char *cdata)
 761 {
 762   int count;
 763
 764   assert (socket != NULL);
 765
 766   for (count = 0; count < GSOCK_MAX_EVENT; count++)
 767   {
 768     /* We test each flag and enable the corresponding events */
 769     if ((flags & (1 << count)) != 0)
 770     {
 771       socket->m_cbacks[count] = callback;
 772       socket->m_data[count] = cdata;
 773     }
 774   }
 775
 776   _GSocket_Configure_Callbacks(socket);
 777 }
 778
 779 /* GSocket_UnsetCallback:
 780  *  Disables all callbacks specified by 'flags', which may be a
 781  *  combination of flags OR'ed toghether.
 782  */
 783 void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags flags)
 784 {
 785   int count = 0;
 786
 787   assert(socket != NULL);
 788
 789   for (count = 0; count < GSOCK_MAX_EVENT; count++)
 790   {
 791     /* We test each flag and disable the corresponding events */
 792     if ((flags & (1 << count)) != 0)
 793     {
 794       socket->m_cbacks[count] = NULL;
 795     }
 796   }
 797
 798   _GSocket_Configure_Callbacks(socket);
 799 }
 800
 801
 802 /* Internals */
 803
 804 void _GSocket_Configure_Callbacks(GSocket *socket)
 805 {
 806   long mask = 0;
 807   int count;
 808
 809   if (socket->m_fd == INVALID_SOCKET)
 810     return;
 811
 812   for (count = 0; count < GSOCK_MAX_EVENT; count++)
 813   {
 814     if (socket->m_cbacks[count] != NULL)
 815     {
 816       switch (count)
 817       {
 818         case GSOCK_INPUT:      mask |= FD_READ; break;
 819         case GSOCK_OUTPUT:     mask |= FD_WRITE; break;
 820         case GSOCK_CONNECTION: mask |= (FD_ACCEPT | FD_CONNECT); break;
 821         case GSOCK_LOST:       mask |= FD_CLOSE; break;
 822       }
 823     }
 824   }
 825
 826   WSAAsyncSelect(socket->m_fd, hWin, socket->m_msgnumber, mask);
 827 }
 828
 829 LRESULT CALLBACK _GSocket_Internal_WinProc(HWND hWnd,
 830                                            UINT uMsg,
 831                                            WPARAM wParam,
 832                                            LPARAM lParam)
 833 {
 834   GSocket *socket;
 835   GSocketEvent event;
 836   GSocketCallback cback;
 837
 838   if (uMsg >= WM_USER && uMsg <= (WM_USER + MAXSOCKETS - 1))
 839   {
 840     EnterCriticalSection(&critical);
 841     socket = socketList[(uMsg - WM_USER)];
 842     event = -1;
 843     cback = NULL;
 844
 845     /* Check that the socket still exists (it has not been
 846      * destroyed) and for safety, check that the m_fd field
 847      * is what we expect it to be.
 848      */
 849     if ((socket != NULL) && (socket->m_fd == wParam))
 850     {
 851       switch WSAGETSELECTEVENT(lParam)
 852       {
 853         case FD_READ:    event = GSOCK_INPUT; break;
 854         case FD_WRITE:   event = GSOCK_OUTPUT; break;
 855         case FD_ACCEPT:  event = GSOCK_CONNECTION; break;
 856         case FD_CONNECT:
 857         {
 858           if (WSAGETSELECTERROR(lParam) != 0)
 859             event = GSOCK_LOST;
 860           else
 861             event = GSOCK_CONNECTION;
 862           break;
 863         }
 864         case FD_CLOSE:   event = GSOCK_LOST; break;
 865       }
 866
 867       if (event != -1)
 868         cback = socket->m_cbacks[event];
 869     }
 870
 871     /* OK, we can now leave the critical section because we have
 872      * already obtained the callback address (we make no further
 873      * accesses to socket->whatever)
 874      */
 875     LeaveCriticalSection(&critical);
 876
 877     if (cback != NULL)
 878       (cback)(socket, event, socket->m_data[event]);
 879
 880     return (LRESULT) 0;
 881   }
 882   else
 883     return DefWindowProc(hWnd, uMsg, wParam, lParam);
 884 }
 885
 886
 887 /* _GSocket_Input_Timeout:
 888  *  For blocking sockets, wait until data is available or
 889  *  until timeout ellapses.
 890  */
 891 GSocketError _GSocket_Input_Timeout(GSocket *socket)
 892 {
 893   fd_set readfds;
 894
 895   if (!socket->m_non_blocking)
 896   {
 897     FD_ZERO(&readfds);
 898     FD_SET(socket->m_fd, &readfds);
 899     if (select(0, &readfds, NULL, NULL, &socket->m_timeout) == 0)
 900     {
 901       socket->m_error = GSOCK_TIMEDOUT;
 902       return GSOCK_TIMEDOUT;
 903     }
 904   }
 905   return GSOCK_NOERROR;
 906 }
 907
 908 /* _GSocket_Output_Timeout:
 909  *  For blocking sockets, wait until data can be sent without
 910  *  blocking or until timeout ellapses.
 911  */
 912 GSocketError _GSocket_Output_Timeout(GSocket *socket)
 913 {
 914   fd_set writefds;
 915
 916   if (!socket->m_non_blocking)
 917   {
 918     FD_ZERO(&writefds);
 919     FD_SET(socket->m_fd, &writefds);
 920     if (select(0, NULL, &writefds, NULL, &socket->m_timeout) == 0)
 921     {
 922       socket->m_error = GSOCK_TIMEDOUT;
 923       return GSOCK_TIMEDOUT;
 924     }
 925   }
 926   return GSOCK_NOERROR;
 927 }
 928
 929 int _GSocket_Recv_Stream(GSocket *socket, char *buffer, int size)
 930 {
 931   int ret;
 932
 933   ret = recv(socket->m_fd, buffer, size, 0);
 934
 935   if (ret == SOCKET_ERROR)
 936   {
 937     if (WSAGetLastError() != WSAEWOULDBLOCK)
 938       socket->m_error = GSOCK_IOERR;
 939     else
 940       socket->m_error = GSOCK_WOULDBLOCK;
 941
 942     return -1;
 943   }
 944
 945   return ret;
 946 }
 947
 948 int _GSocket_Recv_Dgram(GSocket *socket, char *buffer, int size)
 949 {
 950   struct sockaddr from;
 951   SOCKLEN_T fromlen;
 952   int ret;
 953
 954   fromlen = sizeof(from);
 955
 956   ret = recvfrom(socket->m_fd, buffer, size, 0, &from, &fromlen);
 957
 958   if (ret == SOCKET_ERROR)
 959   {
 960     if (WSAGetLastError() != WSAEWOULDBLOCK)
 961       socket->m_error = GSOCK_IOERR;
 962     else
 963       socket->m_error = GSOCK_WOULDBLOCK;
 964
 965     return -1;
 966   }
 967
 968   /* Translate a system address into a GSocket address */
 969   if (!socket->m_peer)
 970   {
 971     socket->m_peer = GAddress_new();
 972     if (!socket->m_peer)
 973     {
 974       socket->m_error = GSOCK_MEMERR;
 975       return -1;
 976     }
 977   }
 978   if (_GAddress_translate_from(socket->m_peer, &from, fromlen) != GSOCK_NOERROR)
 979   {
 980     socket->m_error = GSOCK_MEMERR;
 981     GAddress_destroy(socket->m_peer);
 982     return -1;
 983   }
 984
 985   return ret;
 986 }
 987
 988 int _GSocket_Send_Stream(GSocket *socket, const char *buffer, int size)
 989 {
 990   int ret;
 991
 992   ret = send(socket->m_fd, buffer, size, 0);
 993
 994   if (ret == SOCKET_ERROR)
 995   {
 996     if (WSAGetLastError() != WSAEWOULDBLOCK)
 997       socket->m_error = GSOCK_IOERR;
 998     else
 999       socket->m_error = GSOCK_WOULDBLOCK;
1000
1001     return -1;
1002   }
1003   return ret;
1004 }
1005
1006 int _GSocket_Send_Dgram(GSocket *socket, const char *buffer, int size)
1007 {
1008   struct sockaddr *addr;
1009   int len, ret;
1010
1011   if (!socket->m_peer)
1012   {
1013     socket->m_error = GSOCK_INVADDR;
1014     return -1;
1015   }
1016
1017   if (!_GAddress_translate_to(socket->m_peer, &addr, &len))
1018   {
1019     socket->m_error = GSOCK_MEMERR;
1020     return -1;
1021   }
1022
1023   ret = sendto(socket->m_fd, buffer, size, 0, addr, len);
1024
1025   /* Frees memory allocated by _GAddress_translate_to */
1026   free(addr);
1027
1028   if (ret == SOCKET_ERROR)
1029   {
1030     if (WSAGetLastError() != WSAEWOULDBLOCK)
1031       socket->m_error = GSOCK_IOERR;
1032     else
1033       socket->m_error = GSOCK_WOULDBLOCK;
1034
1035     return -1;
1036   }
1037   return ret;
1038 }
1039
1040
1041 /*
1042  * -------------------------------------------------------------------------
1043  * GAddress
1044  * -------------------------------------------------------------------------
1045  */
1046
1047 /* CHECK_ADDRESS verifies that the current family is either GSOCK_NOFAMILY
1048  * or GSOCK_*family*, and if it is GSOCK_NOFAMILY, it initalizes address
1049  * to be a GSOCK_*family*. In other cases, it returns GSOCK_INVADDR.
1050  */
1051 #define CHECK_ADDRESS(address, family, retval)                      \
1052 {                                                                   \
1053   if (address->m_family == GSOCK_NOFAMILY)                          \
1054     if (_GAddress_Init_##family(address) != GSOCK_NOERROR)          \
1055       return address->m_error;                                      \
1056   if (address->m_family != GSOCK_##family)                          \
1057   {                                                                 \
1058     address->m_error = GSOCK_INVADDR;                               \
1059     return retval;                                                  \
1060   }                                                                 \
1061 }
1062
1063 GAddress *GAddress_new()
1064 {
1065   GAddress *address;
1066
1067   if ((address = (GAddress *) malloc(sizeof(GAddress))) == NULL)
1068     return NULL;
1069
1070   address->m_family = GSOCK_NOFAMILY;
1071   address->m_addr   = NULL;
1072   address->m_len    = 0;
1073
1074   return address;
1075 }
1076
1077 GAddress *GAddress_copy(GAddress *address)
1078 {
1079   GAddress *addr2;
1080
1081   assert(address != NULL);
1082
1083   if ((addr2 = (GAddress *) malloc(sizeof(GAddress))) == NULL)
1084     return NULL;
1085
1086   memcpy(addr2, address, sizeof(GAddress));
1087
1088   if (address->m_addr)
1089   {
1090     addr2->m_addr = (struct sockaddr *) malloc(addr2->m_len);
1091     if (addr2->m_addr == NULL)
1092     {
1093       free(addr2);
1094       return NULL;
1095     }
1096     memcpy(addr2->m_addr, address->m_addr, addr2->m_len);
1097   }
1098
1099   return addr2;
1100 }
1101
1102 void GAddress_destroy(GAddress *address)
1103 {
1104   assert(address != NULL);
1105
1106   free(address);
1107 }
1108
1109 void GAddress_SetFamily(GAddress *address, GAddressType type)
1110 {
1111   assert(address != NULL);
1112
1113   address->m_family = type;
1114 }
1115
1116 GAddressType GAddress_GetFamily(GAddress *address)
1117 {
1118   assert(address != NULL);
1119
1120   return address->m_family;
1121 }
1122
1123 GSocketError _GAddress_translate_from(GAddress *address,
1124                                       struct sockaddr *addr, int len)
1125 {
1126   address->m_realfamily = addr->sa_family;
1127   switch (addr->sa_family)
1128   {
1129     case AF_INET:
1130       address->m_family = GSOCK_INET;
1131       break;
1132     case AF_UNIX:
1133       address->m_family = GSOCK_UNIX;
1134       break;
1135 #ifdef AF_INET6
1136     case AF_INET6:
1137       address->m_family = GSOCK_INET6;
1138       break;
1139 #endif
1140     default:
1141     {
1142       address->m_error = GSOCK_INVOP;
1143       return GSOCK_INVOP;
1144     }
1145   }
1146
1147   if (address->m_addr)
1148     free(address->m_addr);
1149
1150   address->m_len = len;
1151   address->m_addr = (struct sockaddr *) malloc(len);
1152
1153   if (address->m_addr == NULL)
1154   {
1155     address->m_error = GSOCK_MEMERR;
1156     return GSOCK_MEMERR;
1157   }
1158   memcpy(address->m_addr, addr, len);
1159
1160   return GSOCK_NOERROR;
1161 }
1162
1163 GSocketError _GAddress_translate_to(GAddress *address,
1164                                     struct sockaddr **addr, int *len)
1165 {
1166   if (!address->m_addr)
1167   {
1168     address->m_error = GSOCK_INVADDR;
1169     return GSOCK_INVADDR;
1170   }
1171
1172   *len = address->m_len;
1173   *addr = (struct sockaddr *) malloc(address->m_len);
1174   if (*addr == NULL)
1175   {
1176     address->m_error = GSOCK_MEMERR;
1177     return GSOCK_MEMERR;
1178   }
1179
1180   memcpy(*addr, address->m_addr, address->m_len);
1181   return GSOCK_NOERROR;
1182 }
1183
1184 /*
1185  * -------------------------------------------------------------------------
1186  * Internet address family
1187  * -------------------------------------------------------------------------
1188  */
1189
1190 GSocketError _GAddress_Init_INET(GAddress *address)
1191 {
1192   address->m_addr = (struct sockaddr *) malloc(address->m_len);
1193   if (address->m_addr == NULL)
1194   {
1195     address->m_error = GSOCK_MEMERR;
1196     return GSOCK_MEMERR;
1197   }
1198
1199   address->m_len = sizeof(struct sockaddr_in);
1200   address->m_family = GSOCK_INET;
1201   address->m_realfamily = PF_INET;
1202   ((struct sockaddr_in *)address->m_addr)->sin_family = AF_INET;
1203   ((struct sockaddr_in *)address->m_addr)->sin_addr.s_addr = INADDR_ANY;
1204
1205   return GSOCK_NOERROR;
1206 }
1207
1208 GSocketError GAddress_INET_SetHostName(GAddress *address, const char *hostname)
1209 {
1210   struct hostent *he;
1211   struct in_addr *addr;
1212
1213   assert(address != NULL);
1214
1215   CHECK_ADDRESS(address, INET, GSOCK_INVADDR);
1216
1217   addr = &(((struct sockaddr_in *)address->m_addr)->sin_addr);
1218
1219   addr->s_addr = inet_addr(hostname);
1220
1221   /* If it is a numeric host name, convert it now */
1222   if (addr->s_addr == INADDR_NONE)
1223   {
1224     struct in_addr *array_addr;
1225
1226     /* It is a real name, we solve it */
1227     if ((he = gethostbyname(hostname)) == NULL)
1228     {
1229       address->m_error = GSOCK_NOHOST;
1230       return GSOCK_NOHOST;
1231     }
1232     array_addr = (struct in_addr *) *(he->h_addr_list);
1233     addr->s_addr = array_addr[0].s_addr;
1234   }
1235   return GSOCK_NOERROR;
1236 }
1237
1238 GSocketError GAddress_INET_SetHostAddress(GAddress *address,
1239                                           unsigned long hostaddr)
1240 {
1241   struct in_addr *addr;
1242
1243   assert(address != NULL);
1244
1245   CHECK_ADDRESS(address, INET, GSOCK_INVADDR);
1246
1247   addr = &(((struct sockaddr_in *)address->m_addr)->sin_addr);
1248   addr->s_addr = hostaddr;
1249
1250   return GSOCK_NOERROR;
1251 }
1252
1253 GSocketError GAddress_INET_SetPortName(GAddress *address, const char *port,
1254                                        const char *protocol)
1255 {
1256   struct servent *se;
1257   struct sockaddr_in *addr;
1258
1259   assert(address != NULL);
1260   CHECK_ADDRESS(address, INET, GSOCK_INVADDR);
1261
1262   if (!port)
1263   {
1264     address->m_error = GSOCK_INVPORT;
1265     return GSOCK_INVOP;
1266   }
1267
1268   se = getservbyname(port, protocol);
1269   if (!se)
1270   {
1271     if (isdigit(port[0]))
1272     {
1273       int port_int;
1274
1275       port_int = atoi(port);
1276       addr = (struct sockaddr_in *)address->m_addr;
1277       addr->sin_port = htons((u_short) port_int);
1278       return GSOCK_NOERROR;
1279     }
1280
1281     address->m_error = GSOCK_INVPORT;
1282     return GSOCK_INVPORT;
1283   }
1284
1285   addr = (struct sockaddr_in *)address->m_addr;
1286   addr->sin_port = se->s_port;
1287
1288   return GSOCK_NOERROR;
1289 }
1290
1291 GSocketError GAddress_INET_SetPort(GAddress *address, unsigned short port)
1292 {
1293   struct sockaddr_in *addr;
1294
1295   assert(address != NULL);
1296   CHECK_ADDRESS(address, INET, GSOCK_INVADDR);
1297
1298   addr = (struct sockaddr_in *)address->m_addr;
1299   addr->sin_port = htons(port);
1300
1301   return GSOCK_NOERROR;
1302 }
1303
1304 GSocketError GAddress_INET_GetHostName(GAddress *address, char *hostname, size_t sbuf)
1305 {
1306   struct hostent *he;
1307   char *addr_buf;
1308   struct sockaddr_in *addr;
1309
1310   assert(address != NULL);
1311   CHECK_ADDRESS(address, INET, GSOCK_INVADDR);
1312
1313   addr = (struct sockaddr_in *)address->m_addr;
1314   addr_buf = (char *)&(addr->sin_addr);
1315
1316   he = gethostbyaddr(addr_buf, sizeof(addr->sin_addr), AF_INET);
1317   if (he == NULL)
1318   {
1319     address->m_error = GSOCK_NOHOST;
1320     return GSOCK_NOHOST;
1321   }
1322
1323   strncpy(hostname, he->h_name, sbuf);
1324
1325   return GSOCK_NOERROR;
1326 }
1327
1328 unsigned long GAddress_INET_GetHostAddress(GAddress *address)
1329 {
1330   struct sockaddr_in *addr;
1331
1332   assert(address != NULL);
1333   CHECK_ADDRESS(address, INET, 0);
1334
1335   addr = (struct sockaddr_in *)address->m_addr;
1336
1337   return addr->sin_addr.s_addr;
1338 }
1339
1340 unsigned short GAddress_INET_GetPort(GAddress *address)
1341 {
1342   struct sockaddr_in *addr;
1343
1344   assert(address != NULL);
1345   CHECK_ADDRESS(address, INET, 0);
1346
1347   addr = (struct sockaddr_in *)address->m_addr;
1348   return ntohs(addr->sin_port);
1349 }
1350
1351 /*
1352  * -------------------------------------------------------------------------
1353  * Unix address family
1354  * -------------------------------------------------------------------------
1355  */
1356
1357 GSocketError _GAddress_Init_UNIX(GAddress *address)
1358 {
1359   assert (address != NULL);
1360   address->m_error = GSOCK_INVADDR;
1361   return GSOCK_INVADDR;
1362 }
1363
1364 GSocketError GAddress_UNIX_SetPath(GAddress *address, const char *path)
1365 {
1366   assert (address != NULL);
1367   address->m_error = GSOCK_INVADDR;
1368   return GSOCK_INVADDR;
1369 }
1370
1371 GSocketError GAddress_UNIX_GetPath(GAddress *address, char *path, size_t sbuf)
1372 {
1373   assert (address != NULL);
1374   address->m_error = GSOCK_INVADDR;
1375   return GSOCK_INVADDR;
1376 }
1377
1378
1379 #endif  /* defined(__GSOCKET_STANDALONE__) || defined(wxUSE_SOCKETS) */
1380
1381
1382
1383
1384 /* Diferencias con la version Unix:
1385  *  - El descriptor es SOCKET y no int
1386  *  - Constantes -1 pasan a INVALID_SOCKET
1387  *  - Errores en muchas funciones pasan de -1 o <0 a SOCKET_ERROR
1388  *  - ioctl y close pasan a ioctlsocket y closesocket
1389  *  - inet_addr en lugar de inet_aton
1390  *  - Codigo de inicializacion y terminacion para inicializar y
1391  *    terminar WinSocket y para la ventana interna.
1392  *  - SetTimeout en la version MSW simplemente guarda el valor en
1393  *    socket.m_timeout, por tanto no hay necesidad de llamar a
1394  *    SetTimeout cada vez que se crea realmente un socket (no
1395  *    un gsocket).
1396  *  - Lo mismo para SetNonBlocking.
1397  */