include/wx/gsocket.h

   1 /* -------------------------------------------------------------------------
   2  * Project: GSocket (Generic Socket)
   3  * Name:    gsocket.h
   4  * Author:  Guilhem Lavaux
   5  *          Guillermo Rodriguez Garcia <guille@iies.es> (maintainer)
   6  * Purpose: GSocket include file (system independent)
   7  * CVSID:   $Id$
   8  * -------------------------------------------------------------------------
   9  */
  10
  11 #ifndef __GSOCKET_H
  12 #define __GSOCKET_H
  13
  14 /* DFE: Define this and compile gsocket.cpp instead of gsocket.c and
  15    compile existing GUI gsock*.c as C++ to try out the new GSocket. */
  16 /* #define wxUSE_GSOCKET_CPLUSPLUS 1 */
  17 #undef wxUSE_GSOCKET_CPLUSPLUS
  18 #if !defined(__cplusplus) && defined(wxUSE_GSOCKET_CPLUSPLUS)
  19 #error "You need to compile this file (probably a GUI gsock peice) as C++"
  20 #endif
  21
  22 #ifndef __GSOCKET_STANDALONE__
  23 #include "wx/setup.h"
  24 #include "wx/platform.h"
  25
  26 #include "wx/dlimpexp.h" /* for WXDLLIMPEXP_NET */
  27
  28 #endif
  29
  30 #if wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__)
  31
  32 #include <stddef.h>
  33
  34 /*
  35    Including sys/types.h under cygwin results in the warnings about "fd_set
  36    having been defined in sys/types.h" when winsock.h is included later and
  37    doesn't seem to be necessary anyhow. It's not needed under Mac neither.
  38  */
  39 #if !defined(__WXMAC__) && !defined(__CYGWIN__) && !defined(__WXWINCE__)
  40 #include <sys/types.h>
  41 #endif
  42
  43 #ifdef __WXWINCE__
  44 #include <stdlib.h>
  45 #endif
  46
  47 #ifdef wxUSE_GSOCKET_CPLUSPLUS
  48 class GSocket;
  49 #endif
  50
  51 #ifdef __cplusplus
  52 extern "C" {
  53 #endif
  54
  55 #ifndef wxUSE_GSOCKET_CPLUSPLUS
  56 typedef struct _GSocket GSocket;
  57 #endif
  58 typedef struct _GAddress GAddress;
  59
  60 typedef enum {
  61   GSOCK_NOFAMILY = 0,
  62   GSOCK_INET,
  63   GSOCK_INET6,
  64   GSOCK_UNIX
  65 } GAddressType;
  66
  67 typedef enum {
  68   GSOCK_STREAMED,
  69   GSOCK_UNSTREAMED
  70 } GSocketStream;
  71
  72 typedef enum {
  73   GSOCK_NOERROR = 0,
  74   GSOCK_INVOP,
  75   GSOCK_IOERR,
  76   GSOCK_INVADDR,
  77   GSOCK_INVSOCK,
  78   GSOCK_NOHOST,
  79   GSOCK_INVPORT,
  80   GSOCK_WOULDBLOCK,
  81   GSOCK_TIMEDOUT,
  82   GSOCK_MEMERR,
  83   GSOCK_OPTERR,
  84 } GSocketError;
  85
  86 /* See below for an explanation on how events work.
  87  */
  88 typedef enum {
  89   GSOCK_INPUT  = 0,
  90   GSOCK_OUTPUT = 1,
  91   GSOCK_CONNECTION = 2,
  92   GSOCK_LOST = 3,
  93   GSOCK_MAX_EVENT = 4
  94 } GSocketEvent;
  95
  96 enum {
  97   GSOCK_INPUT_FLAG = 1 << GSOCK_INPUT,
  98   GSOCK_OUTPUT_FLAG = 1 << GSOCK_OUTPUT,
  99   GSOCK_CONNECTION_FLAG = 1 << GSOCK_CONNECTION,
 100   GSOCK_LOST_FLAG = 1 << GSOCK_LOST
 101 };
 102
 103 typedef int GSocketEventFlags;
 104
 105 typedef void (*GSocketCallback)(GSocket *socket, GSocketEvent event,
 106                                 char *cdata);
 107
 108
 109 /* Functions tables for internal use by GSocket code: */
 110
 111 #if !defined(__WINDOWS__) && !defined(wxUSE_GSOCKET_CPLUSPLUS)
 112 struct GSocketBaseFunctionsTable
 113 {
 114     void (*Detected_Read)(GSocket *socket);
 115     void (*Detected_Write)(GSocket *socket);
 116 };
 117 #endif
 118
 119 #if defined(wxUSE_GSOCKET_CPLUSPLUS)
 120 /* Actually this is a misnomer now, but reusing this name means I don't
 121    have to ifdef app traits or common socket code */
 122 class GSocketGUIFunctionsTable
 123 {
 124 public:
 125     virtual bool OnInit() = 0;
 126     virtual void OnExit() = 0;
 127     virtual bool CanUseEventLoop() = 0;
 128     virtual bool Init_Socket(GSocket *socket) = 0;
 129     virtual void Destroy_Socket(GSocket *socket) = 0;
 130 #ifndef __WINDOWS__
 131     virtual void Install_Callback(GSocket *socket, GSocketEvent event) = 0;
 132     virtual void Uninstall_Callback(GSocket *socket, GSocketEvent event) = 0;
 133 #endif
 134     virtual void Enable_Events(GSocket *socket) = 0;
 135     virtual void Disable_Events(GSocket *socket) = 0;
 136 };
 137
 138 #else
 139 struct GSocketGUIFunctionsTable
 140 {
 141     int  (*GUI_Init)(void);
 142     void (*GUI_Cleanup)(void);
 143     int  (*GUI_Init_Socket)(GSocket *socket);
 144     void (*GUI_Destroy_Socket)(GSocket *socket);
 145 #ifndef __WINDOWS__
 146     void (*Install_Callback)(GSocket *socket, GSocketEvent event);
 147     void (*Uninstall_Callback)(GSocket *socket, GSocketEvent event);
 148 #endif
 149     void (*Enable_Events)(GSocket *socket);
 150     void (*Disable_Events)(GSocket *socket);
 151 };
 152 #endif /* defined(wxUSE_GSOCKET_CPLUSPLUS) */
 153
 154
 155 /* Global initializers */
 156
 157 /* Sets GUI functions callbacks. Must be called *before* GSocket_Init
 158    if the app uses async sockets. */
 159 void GSocket_SetGUIFunctions(struct GSocketGUIFunctionsTable *guifunc);
 160
 161 /* GSocket_Init() must be called at the beginning */
 162 int GSocket_Init(void);
 163
 164 /* GSocket_Cleanup() must be called at the end */
 165 void GSocket_Cleanup(void);
 166
 167
 168 /* Constructors / Destructors */
 169
 170 GSocket *GSocket_new(void);
 171 #if !defined(wxUSE_GSOCKET_CPLUSPLUS)
 172 void GSocket_destroy(GSocket *socket);
 173 #endif
 174
 175
 176 #ifndef wxUSE_GSOCKET_CPLUSPLUS
 177
 178 /* GSocket_Shutdown:
 179  *  Disallow further read/write operations on this socket, close
 180  *  the fd and disable all callbacks.
 181  */
 182 void GSocket_Shutdown(GSocket *socket);
 183
 184 /* Address handling */
 185
 186 /* GSocket_SetLocal:
 187  * GSocket_GetLocal:
 188  * GSocket_SetPeer:
 189  * GSocket_GetPeer:
 190  *  Set or get the local or peer address for this socket. The 'set'
 191  *  functions return GSOCK_NOERROR on success, an error code otherwise.
 192  *  The 'get' functions return a pointer to a GAddress object on success,
 193  *  or NULL otherwise, in which case they set the error code of the
 194  *  corresponding GSocket.
 195  *
 196  *  Error codes:
 197  *    GSOCK_INVSOCK - the socket is not valid.
 198  *    GSOCK_INVADDR - the address is not valid.
 199  */
 200 GSocketError GSocket_SetLocal(GSocket *socket, GAddress *address);
 201 GSocketError GSocket_SetPeer(GSocket *socket, GAddress *address);
 202 GAddress *GSocket_GetLocal(GSocket *socket);
 203 GAddress *GSocket_GetPeer(GSocket *socket);
 204
 205 /* Server specific parts */
 206
 207 /* GSocket_SetServer:
 208  *  Sets up this socket as a server. The local address must have been
 209  *  set with GSocket_SetLocal() before GSocket_SetServer() is called.
 210  *  Returns GSOCK_NOERROR on success, one of the following otherwise:
 211  *
 212  *  Error codes:
 213  *    GSOCK_INVSOCK - the socket is in use.
 214  *    GSOCK_INVADDR - the local address has not been set.
 215  *    GSOCK_IOERR   - low-level error.
 216  */
 217 GSocketError GSocket_SetServer(GSocket *socket);
 218
 219 /* GSocket_WaitConnection:
 220  *  Waits for an incoming client connection. Returns a pointer to
 221  *  a GSocket object, or NULL if there was an error, in which case
 222  *  the last error field will be updated for the calling GSocket.
 223  *
 224  *  Error codes (set in the calling GSocket)
 225  *    GSOCK_INVSOCK    - the socket is not valid or not a server.
 226  *    GSOCK_TIMEDOUT   - timeout, no incoming connections.
 227  *    GSOCK_WOULDBLOCK - the call would block and the socket is nonblocking.
 228  *    GSOCK_MEMERR     - couldn't allocate memory.
 229  *    GSOCK_IOERR      - low-level error.
 230  */
 231 GSocket *GSocket_WaitConnection(GSocket *socket);
 232
 233
 234 /* Client specific parts */
 235
 236 /* GSocket_Connect:
 237  *  For stream (connection oriented) sockets, GSocket_Connect() tries
 238  *  to establish a client connection to a server using the peer address
 239  *  as established with GSocket_SetPeer(). Returns GSOCK_NOERROR if the
 240  *  connection has been succesfully established, or one of the error
 241  *  codes listed below. Note that for nonblocking sockets, a return
 242  *  value of GSOCK_WOULDBLOCK doesn't mean a failure. The connection
 243  *  request can be completed later; you should use GSocket_Select()
 244  *  to poll for GSOCK_CONNECTION | GSOCK_LOST, or wait for the
 245  *  corresponding asynchronous events.
 246  *
 247  *  For datagram (non connection oriented) sockets, GSocket_Connect()
 248  *  just sets the peer address established with GSocket_SetPeer() as
 249  *  default destination.
 250  *
 251  *  Error codes:
 252  *    GSOCK_INVSOCK    - the socket is in use or not valid.
 253  *    GSOCK_INVADDR    - the peer address has not been established.
 254  *    GSOCK_TIMEDOUT   - timeout, the connection failed.
 255  *    GSOCK_WOULDBLOCK - connection in progress (nonblocking sockets only)
 256  *    GSOCK_MEMERR     - couldn't allocate memory.
 257  *    GSOCK_IOERR      - low-level error.
 258  */
 259 GSocketError GSocket_Connect(GSocket *socket, GSocketStream stream);
 260
 261 /* GSocket_SetReusable:
 262 *  Simply sets the m_resuable flag on the socket. GSocket_SetServer will
 263 *  make the appropriate setsockopt() call.
 264 *  Implemented as a GSocket function because clients (ie, wxSocketServer)
 265 *  don't have access to the GSocket struct information.
 266 *  Returns TRUE if the flag was set correctly, FALSE if an error occured
 267 *  (ie, if the parameter was NULL)
 268 */
 269 int GSocket_SetReusable(GSocket *socket);
 270
 271 /* Datagram sockets */
 272
 273 /* GSocket_SetNonOriented:
 274  *  Sets up this socket as a non-connection oriented (datagram) socket.
 275  *  Before using this function, the local address must have been set
 276  *  with GSocket_SetLocal(), or the call will fail. Returns GSOCK_NOERROR
 277  *  on success, or one of the following otherwise.
 278  *
 279  *  Error codes:
 280  *    GSOCK_INVSOCK - the socket is in use.
 281  *    GSOCK_INVADDR - the local address has not been set.
 282  *    GSOCK_IOERR   - low-level error.
 283  */
 284 GSocketError GSocket_SetNonOriented(GSocket *socket);
 285
 286
 287 /* Generic IO */
 288
 289 /* Like recv(), send(), ... */
 290
 291 /* For datagram sockets, the incoming / outgoing addresses
 292  * are stored as / read from the 'peer' address field.
 293  */
 294 int GSocket_Read(GSocket *socket, char *buffer, int size);
 295 int GSocket_Write(GSocket *socket, const char *buffer,
 296                   int size);
 297
 298 /* GSocket_Select:
 299  *  Polls the socket to determine its status. This function will
 300  *  check for the events specified in the 'flags' parameter, and
 301  *  it will return a mask indicating which operations can be
 302  *  performed. This function won't block, regardless of the
 303  *  mode (blocking | nonblocking) of the socket.
 304  */
 305 GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags);
 306
 307 GSocketError GSocket_GetSockOpt(GSocket *socket, int level, int optname,
 308                                 void *optval, int *optlen);
 309
 310 GSocketError GSocket_SetSockOpt(GSocket *socket, int level, int optname,
 311                                 const void *optval, int optlen);
 312
 313 /* Attributes */
 314
 315 /* GSocket_SetNonBlocking:
 316  *  Sets the socket to non-blocking mode. All IO calls will return
 317  *  immediately.
 318  */
 319 void GSocket_SetNonBlocking(GSocket *socket, int non_block);
 320
 321 /* GSocket_SetTimeout:
 322  *  Sets the timeout for blocking calls. Time is expressed in
 323  *  milliseconds.
 324  */
 325 void GSocket_SetTimeout(GSocket *socket, unsigned long millisec);
 326
 327 /* GSocket_GetError:
 328  *  Returns the last error occured for this socket. Note that successful
 329  *  operations do not clear this back to GSOCK_NOERROR, so use it only
 330  *  after an error.
 331  */
 332 GSocketError WXDLLIMPEXP_NET GSocket_GetError(GSocket *socket);
 333
 334 /* Callbacks */
 335
 336 /* GSOCK_INPUT:
 337  *   There is data to be read in the input buffer. If, after a read
 338  *   operation, there is still data available, the callback function will
 339  *   be called again.
 340  * GSOCK_OUTPUT:
 341  *   The socket is available for writing. That is, the next write call
 342  *   won't block. This event is generated only once, when the connection is
 343  *   first established, and then only if a call failed with GSOCK_WOULDBLOCK,
 344  *   when the output buffer empties again. This means that the app should
 345  *   assume that it can write since the first OUTPUT event, and no more
 346  *   OUTPUT events will be generated unless an error occurs.
 347  * GSOCK_CONNECTION:
 348  *   Connection succesfully established, for client sockets, or incoming
 349  *   client connection, for server sockets. Wait for this event (also watch
 350  *   out for GSOCK_LOST) after you issue a nonblocking GSocket_Connect() call.
 351  * GSOCK_LOST:
 352  *   The connection is lost (or a connection request failed); this could
 353  *   be due to a failure, or due to the peer closing it gracefully.
 354  */
 355
 356 /* GSocket_SetCallback:
 357  *  Enables the callbacks specified by 'flags'. Note that 'flags'
 358  *  may be a combination of flags OR'ed toghether, so the same
 359  *  callback function can be made to accept different events.
 360  *  The callback function must have the following prototype:
 361  *
 362  *  void function(GSocket *socket, GSocketEvent event, char *cdata)
 363  */
 364 void GSocket_SetCallback(GSocket *socket, GSocketEventFlags flags,
 365                          GSocketCallback fallback, char *cdata);
 366
 367 /* GSocket_UnsetCallback:
 368  *  Disables all callbacks specified by 'flags', which may be a
 369  *  combination of flags OR'ed toghether.
 370  */
 371 void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags flags);
 372
 373 #endif /* ndef wxUSE_GSOCKET_CPLUSPLUS */
 374
 375
 376 /* GAddress */
 377
 378 GAddress *GAddress_new(void);
 379 GAddress *GAddress_copy(GAddress *address);
 380 void GAddress_destroy(GAddress *address);
 381
 382 void GAddress_SetFamily(GAddress *address, GAddressType type);
 383 GAddressType GAddress_GetFamily(GAddress *address);
 384
 385 /* The use of any of the next functions will set the address family to
 386  * the specific one. For example if you use GAddress_INET_SetHostName,
 387  * address family will be implicitly set to AF_INET.
 388  */
 389
 390 GSocketError GAddress_INET_SetHostName(GAddress *address, const char *hostname);
 391 GSocketError GAddress_INET_SetAnyAddress(GAddress *address);
 392 GSocketError GAddress_INET_SetHostAddress(GAddress *address,
 393                                           unsigned long hostaddr);
 394 GSocketError GAddress_INET_SetPortName(GAddress *address, const char *port,
 395                                        const char *protocol);
 396 GSocketError GAddress_INET_SetPort(GAddress *address, unsigned short port);
 397
 398 GSocketError GAddress_INET_GetHostName(GAddress *address, char *hostname,
 399                                        size_t sbuf);
 400 unsigned long GAddress_INET_GetHostAddress(GAddress *address);
 401 unsigned short GAddress_INET_GetPort(GAddress *address);
 402
 403 /* TODO: Define specific parts (INET6, UNIX) */
 404
 405 GSocketError GAddress_UNIX_SetPath(GAddress *address, const char *path);
 406 GSocketError GAddress_UNIX_GetPath(GAddress *address, char *path, size_t sbuf);
 407
 408 #ifdef __cplusplus
 409 }
 410 #endif /* __cplusplus */
 411
 412 #ifdef wxUSE_GSOCKET_CPLUSPLUS
 413 # ifdef __WINDOWS__
 414 #  include "wx/msw/gsockmsw.h"
 415 # else
 416 #  include "wx/unix/gsockunx.h"
 417 # endif
 418 #endif
 419
 420 #endif    /* wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__) */
 421
 422 #endif    /* __GSOCKET_H */