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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 static 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 static DPQ_DECL_COMPARECB( cbUglyPig, GUID )
  94 {
  95   return IsEqualGUID( elem1, elem2 );
  96 }
  97
  98 /* Store the given NS remote address for future reference */
  99 void NS_AddRemoteComputerAsNameServer( LPCVOID                      lpcNSAddrHdr,
 100                                        DWORD                        dwHdrSize,
 101                                        LPCDPMSG_ENUMSESSIONSREPLY   lpcMsg,
 102                                        LPVOID                       lpNSInfo )
 103 {
 104   DWORD len;
 105   lpNSCache     lpCache = (lpNSCache)lpNSInfo;
 106   lpNSCacheData lpCacheNode;
 107
 108   TRACE( "%p, %p, %p\n", lpcNSAddrHdr, lpcMsg, lpNSInfo );
 109
 110   /* See if we can find this session. If we can, remove it as it's a dup */
 111   DPQ_REMOVE_ENTRY_CB( lpCache->first, next, data->guidInstance, cbUglyPig,
 112                        lpcMsg->sd.guidInstance, lpCacheNode );
 113
 114   if( lpCacheNode != NULL )
 115   {
 116     TRACE( "Duplicate session entry for %s removed - updated version kept\n",
 117            debugstr_guid( &lpCacheNode->data->guidInstance ) );
 118     cbDeleteNSNodeFromHeap( lpCacheNode );
 119   }
 120
 121   /* Add this to the list */
 122   lpCacheNode = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof( *lpCacheNode ) );
 123
 124   if( lpCacheNode == NULL )
 125   {
 126     ERR( "no memory for NS node\n" );
 127     return;
 128   }
 129
 130   lpCacheNode->lpNSAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 131                                         dwHdrSize );
 132   CopyMemory( lpCacheNode->lpNSAddrHdr, lpcNSAddrHdr, dwHdrSize );
 133
 134   lpCacheNode->data = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof( *(lpCacheNode->data) ) );
 135
 136   if( lpCacheNode->data == NULL )
 137   {
 138     ERR( "no memory for SESSIONDESC2\n" );
 139     return;
 140   }
 141
 142   CopyMemory( lpCacheNode->data, &lpcMsg->sd, sizeof( *lpCacheNode->data ) );
 143   len = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)(lpcMsg+1), -1, NULL, 0, NULL, NULL );
 144   if ((lpCacheNode->data->u1.lpszSessionNameA = HeapAlloc( GetProcessHeap(), 0, len )))
 145   {
 146       WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)(lpcMsg+1), -1,
 147                            lpCacheNode->data->u1.lpszSessionNameA, len, NULL, NULL );
 148   }
 149
 150   lpCacheNode->dwTime = timeGetTime();
 151
 152   DPQ_INSERT(lpCache->first, lpCacheNode, next );
 153
 154   lpCache->present = lpCacheNode;
 155
 156   /* Use this message as an opportunity to weed out any old sessions so
 157    * that we don't enum them again
 158    */
 159   NS_PruneSessionCache( lpNSInfo );
 160 }
 161
 162 LPVOID NS_GetNSAddr( LPVOID lpNSInfo )
 163 {
 164   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 165
 166   FIXME( ":quick stub\n" );
 167
 168   /* Ok. Cheat and don't search for the correct stuff just take the first.
 169    * FIXME: In the future how are we to know what is _THE_ enum we used?
 170    *        This is going to have to go into dplay somehow. Perhaps it
 171    *        comes back with app server id for the join command! Oh...that
 172    *        must be it. That would make this method obsolete once that's
 173    *        in place.
 174    */
 175 #if 1
 176   return lpCache->first.lpQHFirst->lpNSAddrHdr;
 177 #else
 178   /* FIXME: Should convert over to this */
 179   return lpCache->bNsIsLocal ? lpCache->lpLocalAddrHdr
 180                              : lpCache->lpRemoteAddrHdr;
 181 #endif
 182 }
 183
 184 /* Get the magic number associated with the Name Server */
 185 DWORD NS_GetNsMagic( LPVOID lpNSInfo )
 186 {
 187   LPDWORD lpHdrInfo = (LPDWORD)NS_GetNSAddr( lpNSInfo );
 188
 189   return lpHdrInfo[1];
 190 }
 191
 192 /* Get the magic number associated with the non NS end */
 193 DWORD NS_GetOtherMagic( LPVOID lpNSInfo )
 194 {
 195   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 196
 197   return ((LPDWORD)lpCache->lpLocalAddrHdr)[1];
 198 }
 199
 200 void NS_SetLocalAddr( LPVOID lpNSInfo, LPCVOID lpHdr, DWORD dwHdrSize )
 201 {
 202   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 203
 204   lpCache->lpLocalAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, dwHdrSize );
 205
 206   CopyMemory( lpCache->lpLocalAddrHdr, lpHdr, dwHdrSize );
 207 }
 208
 209 /* This function is responsible for sending a request for all other known
 210    nameservers to send us what sessions they have registered locally
 211  */
 212 HRESULT NS_SendSessionRequestBroadcast( LPCGUID lpcGuid,
 213                                         DWORD dwFlags,
 214                                         LPSPINITDATA lpSpData )
 215
 216 {
 217   DPSP_ENUMSESSIONSDATA data;
 218   LPDPMSG_ENUMSESSIONSREQUEST lpMsg;
 219
 220   TRACE( "enumerating for guid %s\n", debugstr_guid( lpcGuid ) );
 221
 222   /* Get the SP to deal with sending the EnumSessions request */
 223   FIXME( ": not all data fields are correct\n" );
 224
 225   data.dwMessageSize = lpSpData->dwSPHeaderSize + sizeof( *lpMsg ); /*FIXME!*/
 226   data.lpMessage = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 227                               data.dwMessageSize );
 228   data.lpISP = lpSpData->lpISP;
 229   data.bReturnStatus = (dwFlags & DPENUMSESSIONS_RETURNSTATUS) ? TRUE : FALSE;
 230
 231
 232   lpMsg = (LPDPMSG_ENUMSESSIONSREQUEST)(((BYTE*)data.lpMessage)+lpSpData->dwSPHeaderSize);
 233
 234   /* Setup EnumSession request message */
 235   lpMsg->envelope.dwMagic    = DPMSGMAGIC_DPLAYMSG;
 236   lpMsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREQUEST;
 237   lpMsg->envelope.wVersion   = DPMSGVER_DP6;
 238
 239   lpMsg->dwPasswordSize = 0; /* FIXME: If enumerating passwords..? */
 240   lpMsg->dwFlags        = dwFlags;
 241
 242   CopyMemory( &lpMsg->guidApplication, lpcGuid, sizeof( *lpcGuid ) );
 243
 244   return (lpSpData->lpCB->EnumSessions)( &data );
 245 }
 246
 247 /* Delete a name server node which has been allocated on the heap */
 248 static DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData )
 249 {
 250   /* NOTE: This proc doesn't deal with the walking pointer */
 251
 252   /* FIXME: Memory leak on data (contained ptrs) */
 253   HeapFree( GetProcessHeap(), 0, elem->data );
 254   HeapFree( GetProcessHeap(), 0, elem->lpNSAddrHdr );
 255   HeapFree( GetProcessHeap(), 0, elem );
 256 }
 257
 258 /* Render all data in a session cache invalid */
 259 void NS_InvalidateSessionCache( LPVOID lpNSInfo )
 260 {
 261   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 262
 263   if( lpCache == NULL )
 264   {
 265     ERR( ": invalidate nonexistent cache\n" );
 266     return;
 267   }
 268
 269   DPQ_DELETEQ( lpCache->first, next, lpNSCacheData, cbDeleteNSNodeFromHeap );
 270
 271   /* NULL out the walking pointer */
 272   lpCache->present = NULL;
 273
 274   lpCache->bNsIsLocal = FALSE;
 275
 276 }
 277
 278 /* Create and initialize a session cache */
 279 BOOL NS_InitializeSessionCache( LPVOID* lplpNSInfo )
 280 {
 281   lpNSCache lpCache = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof( *lpCache ) );
 282
 283   *lplpNSInfo = lpCache;
 284
 285   if( lpCache == NULL )
 286   {
 287     return FALSE;
 288   }
 289
 290   DPQ_INIT(lpCache->first);
 291   lpCache->present = NULL;
 292
 293   lpCache->bNsIsLocal = FALSE;
 294
 295   return TRUE;
 296 }
 297
 298 /* Delete a session cache */
 299 void NS_DeleteSessionCache( LPVOID lpNSInfo )
 300 {
 301   NS_InvalidateSessionCache( (lpNSCache)lpNSInfo );
 302 }
 303
 304 /* Reinitialize the present pointer for this cache */
 305 void NS_ResetSessionEnumeration( LPVOID lpNSInfo )
 306 {
 307   ((lpNSCache)lpNSInfo)->present = ((lpNSCache)lpNSInfo)->first.lpQHFirst;
 308 }
 309
 310 LPDPSESSIONDESC2 NS_WalkSessions( LPVOID lpNSInfo )
 311 {
 312   LPDPSESSIONDESC2 lpSessionDesc;
 313   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 314
 315   /* FIXME: The pointers could disappear when walking if a prune happens */
 316
 317   /* Test for end of the list */
 318   if( lpCache->present == NULL )
 319   {
 320     return NULL;
 321   }
 322
 323   lpSessionDesc = lpCache->present->data;
 324
 325   /* Advance tracking pointer */
 326   lpCache->present = lpCache->present->next.lpQNext;
 327
 328   return lpSessionDesc;
 329 }
 330
 331 /* This method should check to see if there are any sessions which are
 332  * older than the criteria. If so, just delete that information.
 333  */
 334 /* FIXME: This needs to be called by some periodic timer */
 335 void NS_PruneSessionCache( LPVOID lpNSInfo )
 336 {
 337   lpNSCache     lpCache = lpNSInfo;
 338
 339   const DWORD dwPresentTime = timeGetTime();
 340   const DWORD dwPrunePeriod = DPMSG_WAIT_60_SECS; /* is 60 secs enough? */
 341
 342   /* This silly little algorithm is based on the fact we keep entries in
 343    * the queue in a time based order. It also assumes that it is not possible
 344    * to wrap around over yourself (which is not unreasonable).
 345    * The if statements verify if the first entry in the queue is less
 346    * than dwPrunePeriod old depending on the "clock" roll over.
 347    */
 348   for( ;; )
 349   {
 350     lpNSCacheData lpFirstData;
 351
 352     if( DPQ_IS_EMPTY(lpCache->first) )
 353     {
 354       /* Nothing to prune */
 355       break;
 356     }
 357
 358     /* Deal with time in a wrap around safe manner - unsigned arithmetic.
 359      * Check the difference in time */
 360     if( (dwPresentTime - (DPQ_FIRST(lpCache->first)->dwTime)) < dwPrunePeriod )
 361     {
 362       /* First entry has not expired yet; don't prune */
 363       break;
 364     }
 365
 366     lpFirstData = DPQ_FIRST(lpCache->first);
 367     DPQ_REMOVE( lpCache->first, DPQ_FIRST(lpCache->first), next );
 368     cbDeleteNSNodeFromHeap( lpFirstData );
 369   }
 370
 371 }
 372
 373 /* NAME SERVER Message stuff */
 374 void NS_ReplyToEnumSessionsRequest( LPCVOID lpcMsg,
 375                                     LPVOID* lplpReplyData,
 376                                     LPDWORD lpdwReplySize,
 377                                     IDirectPlay2Impl* lpDP )
 378 {
 379   LPDPMSG_ENUMSESSIONSREPLY rmsg;
 380   DWORD dwVariableSize;
 381   DWORD dwVariableLen;
 382   /* LPCDPMSG_ENUMSESSIONSREQUEST msg = (LPDPMSG_ENUMSESSIONSREQUEST)lpcMsg; */
 383   BOOL bAnsi = TRUE; /* FIXME: This needs to be in the DPLAY interface */
 384
 385   FIXME( ": few fixed + need to check request for response\n" );
 386
 387   if (bAnsi)
 388   {
 389       dwVariableLen = MultiByteToWideChar( CP_ACP, 0,
 390                                            lpDP->dp2->lpSessionDesc->u1.lpszSessionNameA,
 391                                            -1, NULL, 0 );
 392   }
 393   else
 394   {
 395       dwVariableLen = strlenW( lpDP->dp2->lpSessionDesc->u1.lpszSessionName ) + 1;
 396   }
 397
 398   dwVariableSize = dwVariableLen * sizeof( WCHAR );
 399
 400   *lpdwReplySize = lpDP->dp2->spData.dwSPHeaderSize +
 401                      sizeof( *rmsg ) + dwVariableSize;
 402   *lplpReplyData = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 403                               *lpdwReplySize );
 404
 405   rmsg = (LPDPMSG_ENUMSESSIONSREPLY)( (BYTE*)*lplpReplyData +
 406                                              lpDP->dp2->spData.dwSPHeaderSize);
 407
 408   rmsg->envelope.dwMagic    = DPMSGMAGIC_DPLAYMSG;
 409   rmsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREPLY;
 410   rmsg->envelope.wVersion   = DPMSGVER_DP6;
 411
 412   CopyMemory( &rmsg->sd, lpDP->dp2->lpSessionDesc,
 413               sizeof( lpDP->dp2->lpSessionDesc->dwSize ) );
 414   rmsg->dwUnknown = 0x0000005c;
 415   if( bAnsi )
 416   {
 417       MultiByteToWideChar( CP_ACP, 0, lpDP->dp2->lpSessionDesc->u1.lpszSessionNameA, -1,
 418                            (LPWSTR)(rmsg+1), dwVariableLen );
 419   }
 420   else
 421   {
 422       strcpyW( (LPWSTR)(rmsg+1), lpDP->dp2->lpSessionDesc->u1.lpszSessionName );
 423   }
 424 }