dlls/dplayx/name_server.c

   1 /* DPLAYX.DLL name server implementation
   2  *
   3  * Copyright 2000-2001 - Peter Hunnisett
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /* NOTE: Methods with the NS_ prefix are name server methods */
  21
  22 #include <stdarg.h>
  23 #include <string.h>
  24
  25 #define NONAMELESSUNION
  26 #define NONAMELESSSTRUCT
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winnls.h"
  30 #include "wine/unicode.h"
  31 #include "wine/debug.h"
  32 #include "mmsystem.h"
  33
  34 #include "dplayx_global.h"
  35 #include "name_server.h"
  36 #include "dplaysp.h"
  37 #include "dplayx_messages.h"
  38 #include "dplayx_queue.h"
  39
  40 /* FIXME: Need to create a crit section, store and use it */
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(dplay);
  43
  44 /* NS specific structures */
  45 struct NSCacheData
  46 {
  47   DPQ_ENTRY(NSCacheData) next;
  48
  49   DWORD dwTime; /* Time at which data was last known valid */
  50   LPDPSESSIONDESC2 data;
  51
  52   LPVOID lpNSAddrHdr;
  53
  54 };
  55 typedef struct NSCacheData NSCacheData, *lpNSCacheData;
  56
  57 struct NSCache
  58 {
  59   lpNSCacheData present; /* keep track of what is to be looked at when walking */
  60
  61   DPQ_HEAD(NSCacheData) first;
  62
  63   BOOL bNsIsLocal;
  64   LPVOID lpLocalAddrHdr;  /* FIXME: Not yet used */
  65   LPVOID lpRemoteAddrHdr; /* FIXME: Not yet used */
  66 };
  67 typedef struct NSCache NSCache, *lpNSCache;
  68
  69 /* Function prototypes */
  70 DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData );
  71
  72 /* Name Server functions
  73  * ---------------------
  74  */
  75 void NS_SetLocalComputerAsNameServer( LPCDPSESSIONDESC2 lpsd, LPVOID lpNSInfo )
  76 {
  77 #if 0
  78   /* FIXME: Remove this method? */
  79   DPLAYX_SetLocalSession( lpsd );
  80 #endif
  81   lpNSCache lpCache = (lpNSCache)lpNSInfo;
  82
  83   lpCache->bNsIsLocal = TRUE;
  84 }
  85
  86 void NS_SetRemoteComputerAsNameServer( LPCDPSESSIONDESC2 lpsd, LPVOID lpNSInfo )
  87 {
  88   lpNSCache lpCache = (lpNSCache)lpNSInfo;
  89
  90   lpCache->bNsIsLocal = FALSE;
  91 }
  92
  93 DPQ_DECL_COMPARECB( cbUglyPig, GUID )
  94 {
  95   return IsEqualGUID( elem1, elem2 );
  96 }
  97
  98 /* Store the given NS remote address for future reference */
  99 /* FIXME: LPDPMSG_ENUMSESSIONSREPLY should be const */
 100 void NS_AddRemoteComputerAsNameServer( LPCVOID                   lpcNSAddrHdr,
 101                                        DWORD                     dwHdrSize,
 102                                        LPDPMSG_ENUMSESSIONSREPLY lpMsg,
 103                                        LPVOID                    lpNSInfo )
 104 {
 105   DWORD len;
 106   lpNSCache     lpCache = (lpNSCache)lpNSInfo;
 107   lpNSCacheData lpCacheNode;
 108
 109   TRACE( "%p, %p, %p\n", lpcNSAddrHdr, lpMsg, lpNSInfo );
 110
 111   /* See if we can find this session. If we can, remove it as it's a dup */
 112   DPQ_REMOVE_ENTRY_CB( lpCache->first, next, data->guidInstance, cbUglyPig,
 113                        lpMsg->sd.guidInstance, lpCacheNode );
 114
 115   if( lpCacheNode != NULL )
 116   {
 117     TRACE( "Duplicate session entry for %s removed - updated version kept\n",
 118            debugstr_guid( &lpCacheNode->data->guidInstance ) );
 119     cbDeleteNSNodeFromHeap( lpCacheNode );
 120   }
 121
 122   /* Add this to the list */
 123   lpCacheNode = (lpNSCacheData)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 124                                           sizeof( *lpCacheNode ) );
 125
 126   if( lpCacheNode == NULL )
 127   {
 128     ERR( "no memory for NS node\n" );
 129     return;
 130   }
 131
 132   lpCacheNode->lpNSAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 133                                         dwHdrSize );
 134   CopyMemory( lpCacheNode->lpNSAddrHdr, lpcNSAddrHdr, dwHdrSize );
 135
 136
 137   lpCacheNode->data = (LPDPSESSIONDESC2)HeapAlloc( GetProcessHeap(),
 138                                                    HEAP_ZERO_MEMORY,
 139                                                    sizeof( *(lpCacheNode->data) ) );
 140
 141   if( lpCacheNode->data == NULL )
 142   {
 143     ERR( "no memory for SESSIONDESC2\n" );
 144     return;
 145   }
 146
 147   CopyMemory( lpCacheNode->data, &lpMsg->sd, sizeof( *lpCacheNode->data ) );
 148   len = WideCharToMultiByte( CP_ACP, 0, (LPWSTR)(lpMsg+1), -1, NULL, 0, NULL, NULL );
 149   if ((lpCacheNode->data->u1.lpszSessionNameA = HeapAlloc( GetProcessHeap(), 0, len )))
 150   {
 151       WideCharToMultiByte( CP_ACP, 0, (LPWSTR)(lpMsg+1), -1,
 152                            lpCacheNode->data->u1.lpszSessionNameA, len, NULL, NULL );
 153   }
 154
 155   lpCacheNode->dwTime = timeGetTime();
 156
 157   DPQ_INSERT(lpCache->first, lpCacheNode, next );
 158
 159   lpCache->present = lpCacheNode;
 160
 161   /* Use this message as an opportunity to weed out any old sessions so
 162    * that we don't enum them again
 163    */
 164   NS_PruneSessionCache( lpNSInfo );
 165 }
 166
 167 LPVOID NS_GetNSAddr( LPVOID lpNSInfo )
 168 {
 169   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 170
 171   FIXME( ":quick stub\n" );
 172
 173   /* Ok. Cheat and don't search for the correct stuff just take the first.
 174    * FIXME: In the future how are we to know what is _THE_ enum we used?
 175    *        This is going to have to go into dplay somehow. Perhaps it
 176    *        comes back with app server id for the join command! Oh...that
 177    *        must be it. That would make this method obsolete once that's
 178    *        in place.
 179    */
 180 #if 1
 181   return lpCache->first.lpQHFirst->lpNSAddrHdr;
 182 #else
 183   /* FIXME: Should convert over to this */
 184   return lpCache->bNsIsLocal ? lpCache->lpLocalAddrHdr
 185                              : lpCache->lpRemoteAddrHdr;
 186 #endif
 187 }
 188
 189 /* Get the magic number associated with the Name Server */
 190 DWORD NS_GetNsMagic( LPVOID lpNSInfo )
 191 {
 192   LPDWORD lpHdrInfo = (LPDWORD)NS_GetNSAddr( lpNSInfo );
 193
 194   return lpHdrInfo[1];
 195 }
 196
 197 /* Get the magic number associated with the non NS end */
 198 DWORD NS_GetOtherMagic( LPVOID lpNSInfo )
 199 {
 200   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 201
 202   return ((LPDWORD)lpCache->lpLocalAddrHdr)[1];
 203 }
 204
 205 void NS_SetLocalAddr( LPVOID lpNSInfo, LPCVOID lpHdr, DWORD dwHdrSize )
 206 {
 207   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 208
 209   lpCache->lpLocalAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, dwHdrSize );
 210
 211   CopyMemory( lpCache->lpLocalAddrHdr, lpHdr, dwHdrSize );
 212 }
 213
 214 /* This function is responsible for sending a request for all other known
 215    nameservers to send us what sessions they have registered locally
 216  */
 217 HRESULT NS_SendSessionRequestBroadcast( LPCGUID lpcGuid,
 218                                         DWORD dwFlags,
 219                                         LPSPINITDATA lpSpData )
 220
 221 {
 222   DPSP_ENUMSESSIONSDATA data;
 223   LPDPMSG_ENUMSESSIONSREQUEST lpMsg;
 224
 225   TRACE( "enumerating for guid %s\n", debugstr_guid( lpcGuid ) );
 226
 227   /* Get the SP to deal with sending the EnumSessions request */
 228   FIXME( ": not all data fields are correct\n" );
 229
 230   data.dwMessageSize = lpSpData->dwSPHeaderSize + sizeof( *lpMsg ); /*FIXME!*/
 231   data.lpMessage = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 232                               data.dwMessageSize );
 233   data.lpISP = lpSpData->lpISP;
 234   data.bReturnStatus = (dwFlags & DPENUMSESSIONS_RETURNSTATUS) ? TRUE : FALSE;
 235
 236
 237   lpMsg = (LPDPMSG_ENUMSESSIONSREQUEST)(((BYTE*)data.lpMessage)+lpSpData->dwSPHeaderSize);
 238
 239   /* Setup EnumSession request message */
 240   lpMsg->envelope.dwMagic    = DPMSGMAGIC_DPLAYMSG;
 241   lpMsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREQUEST;
 242   lpMsg->envelope.wVersion   = DPMSGVER_DP6;
 243
 244   lpMsg->dwPasswordSize = 0; /* FIXME: If enumerating passwords..? */
 245   lpMsg->dwFlags        = dwFlags;
 246
 247   CopyMemory( &lpMsg->guidApplication, lpcGuid, sizeof( *lpcGuid ) );
 248
 249   return (lpSpData->lpCB->EnumSessions)( &data );
 250 }
 251
 252 /* Delete a name server node which has been allocated on the heap */
 253 DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData )
 254 {
 255   /* NOTE: This proc doesn't deal with the walking pointer */
 256
 257   /* FIXME: Memory leak on data (contained ptrs) */
 258   HeapFree( GetProcessHeap(), 0, elem->data );
 259   HeapFree( GetProcessHeap(), 0, elem->lpNSAddrHdr );
 260   HeapFree( GetProcessHeap(), 0, elem );
 261 }
 262
 263 /* Render all data in a session cache invalid */
 264 void NS_InvalidateSessionCache( LPVOID lpNSInfo )
 265 {
 266   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 267
 268   if( lpCache == NULL )
 269   {
 270     ERR( ": invalidate non existent cache\n" );
 271     return;
 272   }
 273
 274   DPQ_DELETEQ( lpCache->first, next, lpNSCacheData, cbDeleteNSNodeFromHeap );
 275
 276   /* NULL out the walking pointer */
 277   lpCache->present = NULL;
 278
 279   lpCache->bNsIsLocal = FALSE;
 280
 281 }
 282
 283 /* Create and initialize a session cache */
 284 BOOL NS_InitializeSessionCache( LPVOID* lplpNSInfo )
 285 {
 286   lpNSCache lpCache = (lpNSCache)HeapAlloc( GetProcessHeap(),
 287                                             HEAP_ZERO_MEMORY,
 288                                             sizeof( *lpCache ) );
 289
 290   *lplpNSInfo = lpCache;
 291
 292   if( lpCache == NULL )
 293   {
 294     return FALSE;
 295   }
 296
 297   DPQ_INIT(lpCache->first);
 298   lpCache->present = NULL;
 299
 300   lpCache->bNsIsLocal = FALSE;
 301
 302   return TRUE;
 303 }
 304
 305 /* Delete a session cache */
 306 void NS_DeleteSessionCache( LPVOID lpNSInfo )
 307 {
 308   NS_InvalidateSessionCache( (lpNSCache)lpNSInfo );
 309 }
 310
 311 /* Reinitialize the present pointer for this cache */
 312 void NS_ResetSessionEnumeration( LPVOID lpNSInfo )
 313 {
 314   ((lpNSCache)lpNSInfo)->present = ((lpNSCache)lpNSInfo)->first.lpQHFirst;
 315 }
 316
 317 LPDPSESSIONDESC2 NS_WalkSessions( LPVOID lpNSInfo )
 318 {
 319   LPDPSESSIONDESC2 lpSessionDesc;
 320   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 321
 322   /* FIXME: The pointers could disappear when walking if a prune happens */
 323
 324   /* Test for end of the list */
 325   if( lpCache->present == NULL )
 326   {
 327     return NULL;
 328   }
 329
 330   lpSessionDesc = lpCache->present->data;
 331
 332   /* Advance tracking pointer */
 333   lpCache->present = lpCache->present->next.lpQNext;
 334
 335   return lpSessionDesc;
 336 }
 337
 338 /* This method should check to see if there are any sessions which are
 339  * older than the criteria. If so, just delete that information.
 340  */
 341 /* FIXME: This needs to be called by some periodic timer */
 342 void NS_PruneSessionCache( LPVOID lpNSInfo )
 343 {
 344   lpNSCache     lpCache = lpNSInfo;
 345
 346   const DWORD dwPresentTime = timeGetTime();
 347   const DWORD dwPrunePeriod = DPMSG_WAIT_60_SECS; /* is 60 secs enough? */
 348
 349   /* This silly little algorithm is based on the fact we keep entries in
 350    * the queue in a time based order. It also assumes that it is not possible
 351    * to wrap around over yourself (which is not unreasonable).
 352    * The if statements verify if the first entry in the queue is less
 353    * than dwPrunePeriod old depending on the "clock" roll over.
 354    */
 355   for( ;; )
 356   {
 357     lpNSCacheData lpFirstData;
 358
 359     if( DPQ_IS_EMPTY(lpCache->first) )
 360     {
 361       /* Nothing to prune */
 362       break;
 363     }
 364
 365     /* Deal with time in a wrap around safe manner - unsigned arithmetic.
 366      * Check the difference in time */
 367     if( (dwPresentTime - (DPQ_FIRST(lpCache->first)->dwTime)) < dwPrunePeriod )
 368     {
 369       /* First entry has not expired yet; don't prune */
 370       break;
 371     }
 372
 373     lpFirstData = DPQ_FIRST(lpCache->first);
 374     DPQ_REMOVE( lpCache->first, DPQ_FIRST(lpCache->first), next );
 375     cbDeleteNSNodeFromHeap( lpFirstData );
 376   }
 377
 378 }
 379
 380 /* NAME SERVER Message stuff */
 381 void NS_ReplyToEnumSessionsRequest( LPCVOID lpcMsg,
 382                                     LPVOID* lplpReplyData,
 383                                     LPDWORD lpdwReplySize,
 384                                     IDirectPlay2Impl* lpDP )
 385 {
 386   LPDPMSG_ENUMSESSIONSREPLY rmsg;
 387   DWORD dwVariableSize;
 388   DWORD dwVariableLen;
 389   /* LPCDPMSG_ENUMSESSIONSREQUEST msg = (LPDPMSG_ENUMSESSIONSREQUEST)lpcMsg; */
 390   BOOL bAnsi = TRUE; /* FIXME: This needs to be in the DPLAY interface */
 391
 392   FIXME( ": few fixed + need to check request for response\n" );
 393
 394   if (bAnsi)
 395   {
 396       dwVariableLen = MultiByteToWideChar( CP_ACP, 0,
 397                                            lpDP->dp2->lpSessionDesc->u1.lpszSessionNameA,
 398                                            -1, NULL, 0 );
 399   }
 400   else
 401   {
 402       dwVariableLen = strlenW( lpDP->dp2->lpSessionDesc->u1.lpszSessionName ) + 1;
 403   }
 404
 405   dwVariableSize = dwVariableLen * sizeof( WCHAR );
 406
 407   *lpdwReplySize = lpDP->dp2->spData.dwSPHeaderSize +
 408                      sizeof( *rmsg ) + dwVariableSize;
 409   *lplpReplyData = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 410                               *lpdwReplySize );
 411
 412   rmsg = (LPDPMSG_ENUMSESSIONSREPLY)( (BYTE*)*lplpReplyData +
 413                                              lpDP->dp2->spData.dwSPHeaderSize);
 414
 415   rmsg->envelope.dwMagic    = DPMSGMAGIC_DPLAYMSG;
 416   rmsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREPLY;
 417   rmsg->envelope.wVersion   = DPMSGVER_DP6;
 418
 419   CopyMemory( &rmsg->sd, lpDP->dp2->lpSessionDesc,
 420               sizeof( lpDP->dp2->lpSessionDesc->dwSize ) );
 421   rmsg->dwUnknown = 0x0000005c;
 422   if( bAnsi )
 423   {
 424       MultiByteToWideChar( CP_ACP, 0, lpDP->dp2->lpSessionDesc->u1.lpszSessionNameA, -1,
 425                            (LPWSTR)(rmsg+1), dwVariableLen );
 426   }
 427   else
 428   {
 429       strcpyW( (LPWSTR)(rmsg+1), lpDP->dp2->lpSessionDesc->u1.lpszSessionName );
 430   }
 431 }