374 lines
11 KiB
C
374 lines
11 KiB
C
/* DPLAYX.DLL name server implementation
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*
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* Copyright 2000 - Peter Hunnisett
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*
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* <presently under construction - contact hunnise@nortelnetworks.com>
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*
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*/
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/* NOTE: Methods with the NS_ prefix are name server methods */
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#include "winbase.h"
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#include "debugtools.h"
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#include "heap.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 "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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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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};
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typedef struct NSCache NSCache, *lpNSCache;
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/* Function prototypes */
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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 )
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{
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#if 0
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/* FIXME: Remove this method? */
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DPLAYX_SetLocalSession( lpsd );
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#endif
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}
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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_SetRemoteComputerAsNameServer( LPVOID lpNSAddrHdr,
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DWORD dwHdrSize,
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LPDPMSG_ENUMSESSIONSREPLY lpMsg,
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LPVOID lpNSInfo )
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{
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lpNSCache lpCache = (lpNSCache)lpNSInfo;
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lpNSCacheData lpCacheNode;
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TRACE( "%p, %p, %p\n", lpNSAddrHdr, lpMsg, lpNSInfo );
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/* FIXME: Should check to see if the reply is for an existing session. If
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* so we remove the old and add the new so oldest is at front.
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*/
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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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lpMsg->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 = (lpNSCacheData)HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
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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, lpNSAddrHdr, dwHdrSize );
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lpCacheNode->data = (LPDPSESSIONDESC2)HeapAlloc( GetProcessHeap(),
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HEAP_ZERO_MEMORY,
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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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return;
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}
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CopyMemory( lpCacheNode->data, &lpMsg->sd, sizeof( *lpCacheNode->data ) );
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lpCacheNode->data->sess.lpszSessionNameA = HEAP_strdupWtoA( GetProcessHeap(),
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HEAP_ZERO_MEMORY,
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(LPWSTR)(lpMsg+1) );
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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 oportunity 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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return lpCache->first.lpQHFirst->lpNSAddrHdr;
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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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LPSPINITDATA 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) ? TRUE : FALSE;
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lpMsg = (LPDPMSG_ENUMSESSIONSREQUEST)(((BYTE*)data.lpMessage)+lpSpData->dwSPHeaderSize);
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/* Setup EnumSession reqest 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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CopyMemory( &lpMsg->guidApplication, lpcGuid, sizeof( *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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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 non existant 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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}
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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 = (lpNSCache)HeapAlloc( GetProcessHeap(),
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HEAP_ZERO_MEMORY,
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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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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 = 60000; /* is 60 secs enough? */
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const DWORD dwPruneTime = dwPresentTime - dwPrunePeriod;
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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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if( dwPruneTime > dwPresentTime ) /* 0 <= dwPresentTime <= dwPrunePeriod */
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{
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if( ( DPQ_FIRST(lpCache->first)->dwTime <= dwPresentTime ) ||
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( DPQ_FIRST(lpCache->first)->dwTime > dwPruneTime )
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)
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{
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/* Less than dwPrunePeriod old - keep */
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break;
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}
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}
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else /* dwPrunePeriod <= dwPresentTime <= max dword */
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{
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if( ( DPQ_FIRST(lpCache->first)->dwTime <= dwPresentTime ) &&
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( DPQ_FIRST(lpCache->first)->dwTime > dwPruneTime )
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)
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{
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/* Less than dwPrunePeriod old - keep */
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break;
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}
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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( LPVOID lpMsg,
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LPDPSP_REPLYDATA lpReplyData,
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IDirectPlay2Impl* 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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LPWSTR string;
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/* LPDPMSG_ENUMSESSIONSREQUEST msg = (LPDPMSG_ENUMSESSIONSREQUEST)lpMsg; */
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BOOL bAnsi = TRUE; /* FIXME: This needs to be in the DPLAY interface */
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FIXME( ": few fixed + need to check request for response\n" );
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dwVariableLen = bAnsi ? lstrlenA( lpDP->dp2->lpSessionDesc->sess.lpszSessionNameA ) + 1
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: lstrlenW( lpDP->dp2->lpSessionDesc->sess.lpszSessionName ) + 1;
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dwVariableSize = dwVariableLen * sizeof( WCHAR );
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lpReplyData->dwMessageSize = lpDP->dp2->spData.dwSPHeaderSize +
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sizeof( *rmsg ) + dwVariableSize;
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lpReplyData->lpMessage = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
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lpReplyData->dwMessageSize );
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rmsg = (LPDPMSG_ENUMSESSIONSREPLY)( (BYTE*)lpReplyData->lpMessage +
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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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sizeof( lpDP->dp2->lpSessionDesc->dwSize ) );
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rmsg->dwUnknown = 0x0000005c;
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if( bAnsi )
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{
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string = HEAP_strdupAtoW( GetProcessHeap(), 0,
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lpDP->dp2->lpSessionDesc->sess.lpszSessionNameA );
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/* FIXME: Memory leak */
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}
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else
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{
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string = lpDP->dp2->lpSessionDesc->sess.lpszSessionName;
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}
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lstrcpyW( (LPWSTR)(rmsg+1), string );
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}
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