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