/* DPLAYX.DLL name server implementation * * Copyright 2000-2001 - Peter Hunnisett * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ /* NOTE: Methods with the NS_ prefix are name server methods */ #include <stdarg.h> #include <string.h> #define NONAMELESSUNION #include "windef.h" #include "winbase.h" #include "winnls.h" #include "wine/unicode.h" #include "wine/debug.h" #include "mmsystem.h" #include "dplayx_global.h" #include "name_server.h" #include "wine/dplaysp.h" #include "dplayx_messages.h" #include "dplayx_queue.h" /* FIXME: Need to create a crit section, store and use it */ WINE_DEFAULT_DEBUG_CHANNEL(dplay); /* NS specific structures */ struct NSCacheData { DPQ_ENTRY(NSCacheData) next; DWORD dwTime; /* Time at which data was last known valid */ LPDPSESSIONDESC2 data; LPVOID lpNSAddrHdr; }; typedef struct NSCacheData NSCacheData, *lpNSCacheData; struct NSCache { lpNSCacheData present; /* keep track of what is to be looked at when walking */ DPQ_HEAD(NSCacheData) first; BOOL bNsIsLocal; LPVOID lpLocalAddrHdr; /* FIXME: Not yet used */ LPVOID lpRemoteAddrHdr; /* FIXME: Not yet used */ }; typedef struct NSCache NSCache, *lpNSCache; /* Function prototypes */ static DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData ); /* Name Server functions * --------------------- */ void NS_SetLocalComputerAsNameServer( LPCDPSESSIONDESC2 lpsd, LPVOID lpNSInfo ) { lpNSCache lpCache = (lpNSCache)lpNSInfo; lpCache->bNsIsLocal = TRUE; } static DPQ_DECL_COMPARECB( cbUglyPig, GUID ) { return IsEqualGUID( elem1, elem2 ); } /* Store the given NS remote address for future reference */ void NS_AddRemoteComputerAsNameServer( LPCVOID lpcNSAddrHdr, DWORD dwHdrSize, LPCDPMSG_ENUMSESSIONSREPLY lpcMsg, LPVOID lpNSInfo ) { DWORD len; lpNSCache lpCache = (lpNSCache)lpNSInfo; lpNSCacheData lpCacheNode; TRACE( "%p, %p, %p\n", lpcNSAddrHdr, lpcMsg, lpNSInfo ); /* See if we can find this session. If we can, remove it as it's a dup */ DPQ_REMOVE_ENTRY_CB( lpCache->first, next, data->guidInstance, cbUglyPig, lpcMsg->sd.guidInstance, lpCacheNode ); if( lpCacheNode != NULL ) { TRACE( "Duplicate session entry for %s removed - updated version kept\n", debugstr_guid( &lpCacheNode->data->guidInstance ) ); cbDeleteNSNodeFromHeap( lpCacheNode ); } /* Add this to the list */ lpCacheNode = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof( *lpCacheNode ) ); if( lpCacheNode == NULL ) { ERR( "no memory for NS node\n" ); return; } lpCacheNode->lpNSAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, dwHdrSize ); CopyMemory( lpCacheNode->lpNSAddrHdr, lpcNSAddrHdr, dwHdrSize ); lpCacheNode->data = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof( *(lpCacheNode->data) ) ); if( lpCacheNode->data == NULL ) { ERR( "no memory for SESSIONDESC2\n" ); HeapFree( GetProcessHeap(), 0, lpCacheNode ); return; } *lpCacheNode->data = lpcMsg->sd; len = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)(lpcMsg+1), -1, NULL, 0, NULL, NULL ); if ((lpCacheNode->data->u1.lpszSessionNameA = HeapAlloc( GetProcessHeap(), 0, len ))) { WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)(lpcMsg+1), -1, lpCacheNode->data->u1.lpszSessionNameA, len, NULL, NULL ); } lpCacheNode->dwTime = timeGetTime(); DPQ_INSERT(lpCache->first, lpCacheNode, next ); lpCache->present = lpCacheNode; /* Use this message as an opportunity to weed out any old sessions so * that we don't enum them again */ NS_PruneSessionCache( lpNSInfo ); } LPVOID NS_GetNSAddr( LPVOID lpNSInfo ) { lpNSCache lpCache = (lpNSCache)lpNSInfo; FIXME( ":quick stub\n" ); /* Ok. Cheat and don't search for the correct stuff just take the first. * FIXME: In the future how are we to know what is _THE_ enum we used? * This is going to have to go into dplay somehow. Perhaps it * comes back with app server id for the join command! Oh... that * must be it. That would make this method obsolete once that's * in place. */ #if 1 if ( lpCache->first.lpQHFirst ) return lpCache->first.lpQHFirst->lpNSAddrHdr; return NULL; #else /* FIXME: Should convert over to this */ return lpCache->bNsIsLocal ? lpCache->lpLocalAddrHdr : lpCache->lpRemoteAddrHdr; #endif } /* Get the magic number associated with the Name Server */ DWORD NS_GetNsMagic( LPVOID lpNSInfo ) { LPDWORD lpHdrInfo = NS_GetNSAddr( lpNSInfo ); return lpHdrInfo[1]; } void NS_SetLocalAddr( LPVOID lpNSInfo, LPCVOID lpHdr, DWORD dwHdrSize ) { lpNSCache lpCache = (lpNSCache)lpNSInfo; lpCache->lpLocalAddrHdr = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, dwHdrSize ); CopyMemory( lpCache->lpLocalAddrHdr, lpHdr, dwHdrSize ); } /* This function is responsible for sending a request for all other known nameservers to send us what sessions they have registered locally */ HRESULT NS_SendSessionRequestBroadcast( LPCGUID lpcGuid, DWORD dwFlags, const SPINITDATA *lpSpData ) { DPSP_ENUMSESSIONSDATA data; LPDPMSG_ENUMSESSIONSREQUEST lpMsg; TRACE( "enumerating for guid %s\n", debugstr_guid( lpcGuid ) ); /* Get the SP to deal with sending the EnumSessions request */ FIXME( ": not all data fields are correct\n" ); data.dwMessageSize = lpSpData->dwSPHeaderSize + sizeof( *lpMsg ); /*FIXME!*/ data.lpMessage = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, data.dwMessageSize ); data.lpISP = lpSpData->lpISP; data.bReturnStatus = (dwFlags & DPENUMSESSIONS_RETURNSTATUS) != 0; lpMsg = (LPDPMSG_ENUMSESSIONSREQUEST)(((BYTE*)data.lpMessage)+lpSpData->dwSPHeaderSize); /* Setup EnumSession request message */ lpMsg->envelope.dwMagic = DPMSGMAGIC_DPLAYMSG; lpMsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREQUEST; lpMsg->envelope.wVersion = DPMSGVER_DP6; lpMsg->dwPasswordSize = 0; /* FIXME: If enumerating passwords..? */ lpMsg->dwFlags = dwFlags; lpMsg->guidApplication = *lpcGuid; return (lpSpData->lpCB->EnumSessions)( &data ); } /* Delete a name server node which has been allocated on the heap */ static DPQ_DECL_DELETECB( cbDeleteNSNodeFromHeap, lpNSCacheData ) { /* NOTE: This proc doesn't deal with the walking pointer */ /* FIXME: Memory leak on data (contained ptrs) */ HeapFree( GetProcessHeap(), 0, elem->data ); HeapFree( GetProcessHeap(), 0, elem->lpNSAddrHdr ); HeapFree( GetProcessHeap(), 0, elem ); } /* Render all data in a session cache invalid */ void NS_InvalidateSessionCache( LPVOID lpNSInfo ) { lpNSCache lpCache = (lpNSCache)lpNSInfo; if( lpCache == NULL ) { ERR( ": invalidate nonexistent cache\n" ); return; } DPQ_DELETEQ( lpCache->first, next, lpNSCacheData, cbDeleteNSNodeFromHeap ); /* NULL out the walking pointer */ lpCache->present = NULL; lpCache->bNsIsLocal = FALSE; } /* Create and initialize a session cache */ BOOL NS_InitializeSessionCache( LPVOID* lplpNSInfo ) { lpNSCache lpCache = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof( *lpCache ) ); *lplpNSInfo = lpCache; if( lpCache == NULL ) { return FALSE; } DPQ_INIT(lpCache->first); lpCache->present = NULL; lpCache->bNsIsLocal = FALSE; return TRUE; } /* Delete a session cache */ void NS_DeleteSessionCache( LPVOID lpNSInfo ) { NS_InvalidateSessionCache( (lpNSCache)lpNSInfo ); } /* Reinitialize the present pointer for this cache */ void NS_ResetSessionEnumeration( LPVOID lpNSInfo ) { ((lpNSCache)lpNSInfo)->present = ((lpNSCache)lpNSInfo)->first.lpQHFirst; } LPDPSESSIONDESC2 NS_WalkSessions( LPVOID lpNSInfo ) { LPDPSESSIONDESC2 lpSessionDesc; lpNSCache lpCache = (lpNSCache)lpNSInfo; /* FIXME: The pointers could disappear when walking if a prune happens */ /* Test for end of the list */ if( lpCache->present == NULL ) { return NULL; } lpSessionDesc = lpCache->present->data; /* Advance tracking pointer */ lpCache->present = lpCache->present->next.lpQNext; return lpSessionDesc; } /* This method should check to see if there are any sessions which are * older than the criteria. If so, just delete that information. */ /* FIXME: This needs to be called by some periodic timer */ void NS_PruneSessionCache( LPVOID lpNSInfo ) { lpNSCache lpCache = lpNSInfo; const DWORD dwPresentTime = timeGetTime(); const DWORD dwPrunePeriod = DPMSG_WAIT_60_SECS; /* is 60 secs enough? */ /* This silly little algorithm is based on the fact we keep entries in * the queue in a time based order. It also assumes that it is not possible * to wrap around over yourself (which is not unreasonable). * The if statements verify if the first entry in the queue is less * than dwPrunePeriod old depending on the "clock" roll over. */ for( ;; ) { lpNSCacheData lpFirstData; if( DPQ_IS_EMPTY(lpCache->first) ) { /* Nothing to prune */ break; } /* Deal with time in a wrap around safe manner - unsigned arithmetic. * Check the difference in time */ if( (dwPresentTime - (DPQ_FIRST(lpCache->first)->dwTime)) < dwPrunePeriod ) { /* First entry has not expired yet; don't prune */ break; } lpFirstData = DPQ_FIRST(lpCache->first); DPQ_REMOVE( lpCache->first, DPQ_FIRST(lpCache->first), next ); cbDeleteNSNodeFromHeap( lpFirstData ); } } /* NAME SERVER Message stuff */ void NS_ReplyToEnumSessionsRequest( const void *lpcMsg, void **lplpReplyData, DWORD *lpdwReplySize, IDirectPlayImpl *lpDP ) { LPDPMSG_ENUMSESSIONSREPLY rmsg; DWORD dwVariableSize; DWORD dwVariableLen; /* LPCDPMSG_ENUMSESSIONSREQUEST msg = (LPDPMSG_ENUMSESSIONSREQUEST)lpcMsg; */ /* FIXME: Should handle ANSI or WIDECHAR input. Currently just ANSI input */ FIXME( ": few fixed + need to check request for response, might need UNICODE input ability.\n" ); dwVariableLen = MultiByteToWideChar( CP_ACP, 0, lpDP->dp2->lpSessionDesc->u1.lpszSessionNameA, -1, NULL, 0 ); dwVariableSize = dwVariableLen * sizeof( WCHAR ); *lpdwReplySize = lpDP->dp2->spData.dwSPHeaderSize + sizeof( *rmsg ) + dwVariableSize; *lplpReplyData = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, *lpdwReplySize ); rmsg = (LPDPMSG_ENUMSESSIONSREPLY)( (BYTE*)*lplpReplyData + lpDP->dp2->spData.dwSPHeaderSize); rmsg->envelope.dwMagic = DPMSGMAGIC_DPLAYMSG; rmsg->envelope.wCommandId = DPMSGCMD_ENUMSESSIONSREPLY; rmsg->envelope.wVersion = DPMSGVER_DP6; CopyMemory( &rmsg->sd, lpDP->dp2->lpSessionDesc, lpDP->dp2->lpSessionDesc->dwSize ); rmsg->dwUnknown = 0x0000005c; MultiByteToWideChar( CP_ACP, 0, lpDP->dp2->lpSessionDesc->u1.lpszSessionNameA, -1, (LPWSTR)(rmsg+1), dwVariableLen ); }