dlls/dplayx/name_server.c

   1 /* DPLAYX.DLL name server implementation
   2  *
   3  * Copyright 2000 - Peter Hunnisett
   4  *
   5  * <presently under construction - contact hunnise@nortelnetworks.com>
   6  *
   7  */
   8
   9 /* NOTE: Methods with the NS_ prefix are name server methods */
  10
  11 #include "winbase.h"
  12 #include "debugtools.h"
  13 #include "heap.h"
  14
  15 #include "dplayx_global.h"
  16 #include "name_server.h"
  17 #include "dplaysp.h"
  18 #include "dplayx_messages.h"
  19 #include "dplayx_queue.h"
  20
  21 /* FIXME: Need to create a crit section, store and use it */
  22
  23 DEFAULT_DEBUG_CHANNEL(dplay);
  24
  25 /* NS specific structures */
  26 struct NSCacheData
  27 {
  28   DPQ_ENTRY(NSCacheData) next;
  29
  30   DWORD dwTime; /* Time at which data was last known valid */
  31   LPDPSESSIONDESC2 data;
  32
  33   LPVOID lpNSAddrHdr;
  34
  35 };
  36 typedef struct NSCacheData NSCacheData, *lpNSCacheData;
  37
  38 struct NSCache
  39 {
  40   lpNSCacheData present; /* keep track of what is to be looked at when walking */
  41
  42   DPQ_HEAD(NSCacheData) first;
  43 };
  44 typedef struct NSCache NSCache, *lpNSCache;
  45
  46 /* Name Server functions
  47  * ---------------------
  48  */
  49 void NS_SetLocalComputerAsNameServer( LPCDPSESSIONDESC2 lpsd )
  50 {
  51 #if 0
  52   DPLAYX_SetLocalSession( lpsd );
  53 #endif
  54 }
  55
  56 /* Store the given NS remote address for future reference */
  57 void NS_SetRemoteComputerAsNameServer( LPVOID                    lpNSAddrHdr,
  58                                        DWORD                     dwHdrSize,
  59                                        LPDPMSG_ENUMSESSIONSREPLY lpMsg,
  60                                        LPVOID                    lpNSInfo )
  61 {
  62   lpNSCache     lpCache = (lpNSCache)lpNSInfo;
  63   lpNSCacheData lpCacheNode;
  64
  65   TRACE( "%p, %p, %p\n", lpNSAddrHdr, lpMsg, lpNSInfo );
  66
  67   /* FIXME: Should check to see if the reply is for an existing session. If
  68    *        so we just update the contents and update the timestamp.
  69    */
  70   lpCacheNode = (lpNSCacheData)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
  71                                           sizeof( *lpCacheNode ) );
  72
  73   if( lpCacheNode == NULL )
  74   {
  75     ERR( "no memory for NS node\n" );
  76     return;
  77   }
  78
  79   lpCacheNode->lpNSAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
  80                                         dwHdrSize );
  81   CopyMemory( lpCacheNode->lpNSAddrHdr, lpNSAddrHdr, dwHdrSize );
  82
  83
  84   lpCacheNode->data = (LPDPSESSIONDESC2)HeapAlloc( GetProcessHeap(),
  85                                                    HEAP_ZERO_MEMORY,
  86                                                    sizeof( *lpCacheNode->data ) );
  87
  88   if( lpCacheNode->data == NULL )
  89   {
  90     ERR( "no memory for SESSIONDESC2\n" );
  91     return;
  92   }
  93
  94   CopyMemory( lpCacheNode->data, &lpMsg->sd, sizeof( *lpCacheNode->data ) );
  95   lpCacheNode->data->sess.lpszSessionNameA = HEAP_strdupWtoA( GetProcessHeap(),
  96                                                               HEAP_ZERO_MEMORY,
  97                                                               (LPWSTR)(lpMsg+1) );
  98
  99   lpCacheNode->dwTime = GetTickCount();
 100
 101   DPQ_INSERT(lpCache->first, lpCacheNode, next );
 102
 103   lpCache->present = lpCacheNode;
 104
 105   /* Use this message as an oportunity to weed out any old sessions so
 106    * that we don't enum them again
 107    */
 108   NS_PruneSessionCache( lpNSInfo );
 109 }
 110
 111 LPVOID NS_GetNSAddr( LPVOID lpNSInfo )
 112 {
 113   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 114
 115   FIXME( ":quick stub\n" );
 116
 117   /* Ok. Cheat and don't search for the correct stuff just take the first.
 118    * FIXME: In the future how are we to know what is _THE_ enum we used?
 119    */
 120
 121   return lpCache->first.lpQHFirst->lpNSAddrHdr;
 122 }
 123
 124 /* This function is responsible for sending a request for all other known
 125    nameservers to send us what sessions they have registered locally
 126  */
 127 HRESULT NS_SendSessionRequestBroadcast( LPCGUID lpcGuid,
 128                                         DWORD dwFlags,
 129                                         LPSPINITDATA lpSpData )
 130
 131 {
 132   DPSP_ENUMSESSIONSDATA data;
 133   LPDPMSG_ENUMSESSIONSREQUEST lpMsg;
 134
 135   TRACE( "enumerating for guid %s\n", debugstr_guid( lpcGuid ) );
 136
 137   /* Get the SP to deal with sending the EnumSessions request */
 138   FIXME( ": not all data fields are correct\n" );
 139
 140   data.dwMessageSize = lpSpData->dwSPHeaderSize + sizeof( *lpMsg ); /*FIXME!*/
 141   data.lpMessage = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 142                               data.dwMessageSize );
 143   data.lpISP = lpSpData->lpISP;
 144   data.bReturnStatus = (dwFlags & DPENUMSESSIONS_RETURNSTATUS) ? TRUE : FALSE;
 145
 146
 147   lpMsg = (LPDPMSG_ENUMSESSIONSREQUEST)(((BYTE*)data.lpMessage)+lpSpData->dwSPHeaderSize);
 148
 149   /* Setup EnumSession reqest message */
 150   lpMsg->envelope.dwMagic    = DPMSGMAGIC_DPLAYMSG;
 151   lpMsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREQUEST;
 152   lpMsg->envelope.wVersion   = DPMSGVER_DP6;
 153
 154   lpMsg->dwPasswordSize = 0; /* FIXME: If enumerating passwords..? */
 155   lpMsg->dwFlags        = dwFlags;
 156
 157   CopyMemory( &lpMsg->guidApplication, lpcGuid, sizeof( *lpcGuid ) );
 158
 159   return (lpSpData->lpCB->EnumSessions)( &data );
 160 }
 161
 162 DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData );
 163 DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData )
 164 {
 165   /* FIXME: Memory leak on data (contained ptrs) */
 166   HeapFree( GetProcessHeap(), 0, elem->data );
 167   HeapFree( GetProcessHeap(), 0, elem->lpNSAddrHdr );
 168   HeapFree( GetProcessHeap(), 0, elem );
 169 }
 170
 171
 172
 173 /* Render all data in a session cache invalid */
 174 void NS_InvalidateSessionCache( LPVOID lpNSInfo )
 175 {
 176   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 177
 178   if( lpCache == NULL )
 179   {
 180     ERR( ": invalidate non existant cache\n" );
 181     return;
 182   }
 183
 184   DPQ_DELETEQ( lpCache->first, next, lpNSCacheData, cbDeleteNSNodeFromHeap );
 185
 186   /* NULL out the walking pointer */
 187   lpCache->present = NULL;
 188 }
 189
 190 /* Create and initialize a session cache */
 191 BOOL NS_InitializeSessionCache( LPVOID* lplpNSInfo )
 192 {
 193   lpNSCache lpCache = (lpNSCache)HeapAlloc( GetProcessHeap(),
 194                                             HEAP_ZERO_MEMORY,
 195                                             sizeof( *lpCache ) );
 196
 197   *lplpNSInfo = lpCache;
 198
 199   if( lpCache == NULL )
 200   {
 201     return FALSE;
 202   }
 203
 204   DPQ_INIT(lpCache->first);
 205   lpCache->present = NULL;
 206
 207   return TRUE;
 208 }
 209
 210 /* Delete a session cache */
 211 void NS_DeleteSessionCache( LPVOID lpNSInfo )
 212 {
 213   NS_InvalidateSessionCache( (lpNSCache)lpNSInfo );
 214 }
 215
 216 /* Reinitialize the present pointer for this cache */
 217 void NS_ResetSessionEnumeration( LPVOID lpNSInfo )
 218 {
 219
 220   ((lpNSCache)lpNSInfo)->present = ((lpNSCache)lpNSInfo)->first.lpQHFirst;
 221 }
 222
 223 LPDPSESSIONDESC2 NS_WalkSessions( LPVOID lpNSInfo )
 224 {
 225   LPDPSESSIONDESC2 lpSessionDesc;
 226   lpNSCache lpCache = (lpNSCache)lpNSInfo;
 227
 228   /* FIXME: The pointers could disappear when walking if a prune happens */
 229
 230   /* Test for end of the list */
 231   if( lpCache->present == NULL )
 232   {
 233     return NULL;
 234   }
 235
 236   lpSessionDesc = lpCache->present->data;
 237
 238   /* Advance tracking pointer */
 239   lpCache->present = lpCache->present->next.lpQNext;
 240
 241   return lpSessionDesc;
 242 }
 243
 244 /* This method should check to see if there are any sessions which are
 245  * older than the criteria. If so, just delete that information.
 246  */
 247 void NS_PruneSessionCache( LPVOID lpNSInfo )
 248 {
 249   lpNSCache     lpCache = lpNSInfo;
 250   lpNSCacheData lpCacheEntry;
 251
 252   DWORD dwPresentTime = GetTickCount();
 253 #if defined( HACK_TIMEGETTIME )
 254   DWORD dwPruneTime   = dwPresentTime - 2; /* One iteration with safety */
 255 #else
 256   DWORD dwPruneTime   = dwPresentTime - 10000 /* 10 secs? */;
 257 #endif
 258
 259   FIXME( ": semi stub\n" );
 260
 261   /* FIXME: This doesn't handle time roll over correctly */
 262   /* FIXME: Session memory leak on delete */
 263   do
 264   {
 265     DPQ_FIND_ENTRY( lpCache->first, next, dwTime, <=, dwPruneTime, lpCacheEntry );
 266   }
 267   while( lpCacheEntry != NULL );
 268
 269 }
 270
 271
 272
 273 /* Message stuff */
 274 void NS_ReplyToEnumSessionsRequest( LPVOID lpMsg,
 275                                     LPDPSP_REPLYDATA lpReplyData,
 276                                     IDirectPlay2Impl* lpDP )
 277 {
 278   LPDPMSG_ENUMSESSIONSREPLY rmsg;
 279   DWORD dwVariableSize;
 280   DWORD dwVariableLen;
 281   LPWSTR string;
 282   /* LPDPMSG_ENUMSESSIONSREQUEST msg = (LPDPMSG_ENUMSESSIONSREQUEST)lpMsg; */
 283   BOOL bAnsi = TRUE; /* FIXME: This needs to be in the DPLAY interface */
 284
 285   FIXME( ": few fixed + need to check request for response\n" );
 286
 287   dwVariableLen = bAnsi ? lstrlenA( lpDP->dp2->lpSessionDesc->sess.lpszSessionNameA ) + 1
 288                          : lstrlenW( lpDP->dp2->lpSessionDesc->sess.lpszSessionName ) + 1;
 289
 290   dwVariableSize = dwVariableLen * sizeof( WCHAR );
 291
 292   lpReplyData->dwMessageSize = lpDP->dp2->spData.dwSPHeaderSize +
 293                                  sizeof( *rmsg ) + dwVariableSize;
 294   lpReplyData->lpMessage     = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 295                                           lpReplyData->dwMessageSize );
 296
 297   rmsg = (LPDPMSG_ENUMSESSIONSREPLY)( (BYTE*)lpReplyData->lpMessage +
 298                                              lpDP->dp2->spData.dwSPHeaderSize);
 299
 300   rmsg->envelope.dwMagic    = DPMSGMAGIC_DPLAYMSG;
 301   rmsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREPLY;
 302   rmsg->envelope.wVersion   = DPMSGVER_DP6;
 303
 304   CopyMemory( &rmsg->sd, lpDP->dp2->lpSessionDesc,
 305               sizeof( lpDP->dp2->lpSessionDesc->dwSize ) );
 306   rmsg->dwUnknown = 0x0000005c;
 307   if( bAnsi )
 308   {
 309     string = HEAP_strdupAtoW( GetProcessHeap(), 0,
 310                               lpDP->dp2->lpSessionDesc->sess.lpszSessionNameA );
 311     /* FIXME: Memory leak */
 312   }
 313   else
 314   {
 315     string = lpDP->dp2->lpSessionDesc->sess.lpszSessionName;
 316   }
 317
 318   lstrcpyW( (LPWSTR)(rmsg+1), string );
 319
 320 }
 321