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windows-nt/Source/XPSP1/NT/net/rras/ipx/sap/serverdb.c

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/*++
Copyright (c) 1995 Microsoft Corporation
Module Name:
net\routing\ipx\sap\serverdb.c
Abstract:
This module implements SAP Server Table and corresponding API
Author:
Vadim Eydelman 05-15-1995
Revision History:
--*/
#include "sapp.h"
// The table
SERVER_TABLE ServerTable;
// Max number of unsorted servers
ULONG SDBMaxUnsortedServers=SAP_SDB_MAX_UNSORTED_DEF;
// Interval with which to update the sorted list
ULONG SDBSortLatency=SAP_SDB_SORT_LATENCY_DEF;
// Size of heap reserved for the database
ULONG SDBMaxHeapSize=SAP_SDB_MAX_HEAP_SIZE_DEF;
// Local prototypes
BOOL
AcquireAllLocks (
void
);
VOID
ReleaseAllLocks (
void
);
PSERVER_NODE
CreateNode (
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN DWORD Protocol,
IN PUCHAR AdvertisingNode,
IN PSDB_HASH_LIST HashList
);
VOID
ChangeMainNode (
IN PSERVER_NODE oldNode,
IN PSERVER_NODE newNode,
IN PLIST_ENTRY serverLink
);
VOID
DeleteNode (
IN PSERVER_NODE node
);
VOID
DeleteMainNode (
IN PSERVER_NODE node
);
DWORD
DoFindNextNode (
IN PLIST_ENTRY cur,
IN PPROTECTED_LIST list,
IN INT link,
IN DWORD ExclusionFlags,
IN OUT PIPX_SERVER_ENTRY_P Server,
IN OUT PULONG InterfaceIndex OPTIONAL,
IN OUT PULONG Protocol OPTIONAL,
OUT PULONG ObjectID OPTIONAL
);
VOID
DoUpdateSortedList (
void
);
PLIST_ENTRY
FindIntfLink (
ULONG InterfaceIndex
);
PLIST_ENTRY
FindTypeLink (
USHORT Type
);
PLIST_ENTRY
FindSortedLink (
USHORT Type,
PUCHAR Name
);
INT
HashFunction (
PUCHAR Name
);
ULONG
GenerateUniqueID (
PSDB_HASH_LIST HashList
);
/*++
*******************************************************************
C r e a t e S e r v e r T a b l e
Routine Description:
Allocates resources for server table management
Arguments:
UpdateObject - this object will be signalled when 'slow'
sorted list of servers needs to be updated
(UpdateSortedList should be called)
TimerObject - this object will be signalled when server expiration
queue requires processing (ProcessExpirationQueue should
be called)
Return Value:
NO_ERROR - resources were allocated successfully
other - reason of failure (windows error code)
*******************************************************************
--*/
DWORD
CreateServerTable (
HANDLE *UpdateObject,
HANDLE *TimerObject
) {
DWORD status=NO_ERROR;
INT i;
BOOL res;
// Use private heap for server entries
// to eliminate fragmentation
ServerTable.ST_Heap = HeapCreate (0, 0, SDBMaxHeapSize*1024*1024);
if (ServerTable.ST_Heap!=NULL) {
ServerTable.ST_UpdateTimer = CreateWaitableTimer (
NULL,
TRUE, // Manual reset
NULL);
if (ServerTable.ST_UpdateTimer!=NULL) {
*UpdateObject = ServerTable.ST_UpdateTimer;
ServerTable.ST_ExpirationTimer = CreateWaitableTimer (
NULL,
TRUE, // Manual reset
NULL);
if (ServerTable.ST_ExpirationTimer!=NULL) {
LONGLONG timeout = 0;
*TimerObject = ServerTable.ST_ExpirationTimer;
ServerTable.ST_LastEnumerator = NULL;
ServerTable.ST_ServerCnt = 0;
ServerTable.ST_StaticServerCnt = 0;
ServerTable.ST_TMPListCnt = 0;
ServerTable.ST_DeletedListCnt = 0;
ServerTable.ST_UpdatePending = -1;
InitializeSyncObjPool (&ServerTable.ST_SyncPool);
InitializeProtectedList (&ServerTable.ST_SortedListPRM);
InitializeProtectedList (&ServerTable.ST_SortedListTMP);
InitializeProtectedList (&ServerTable.ST_DeletedList);
InitializeProtectedList (&ServerTable.ST_TypeList);
InitializeProtectedList (&ServerTable.ST_IntfList);
InitializeProtectedList (&ServerTable.ST_ExpirationQueue);
InitializeProtectedList (&ServerTable.ST_ChangedSvrsQueue);
for (i=0; i<SDB_NAME_HASH_SIZE; i++) {
InitializeProtectedList (&ServerTable.ST_HashLists[i].HL_List);
ServerTable.ST_HashLists[i].HL_ObjectID = i;
}
res = SetWaitableTimer (
ServerTable.ST_UpdateTimer,
(PLARGE_INTEGER)&timeout,
0, // no period
NULL, NULL, // no completion
FALSE); // no need to resume
ASSERTMSG ("Could not set update timer ", res);
res = SetWaitableTimer (
ServerTable.ST_ExpirationTimer,
(PLARGE_INTEGER)&timeout,
0, // no period
NULL, NULL, // no completion
FALSE); // no need to resume
ASSERTMSG ("Could not set expiration timer ", res);
return NO_ERROR;
}
else {
status = GetLastError ();
Trace (DEBUG_FAILURES, "File: %s, line: %ld."
" Could not create expiration timer (gle:%ld).",
__FILE__, __LINE__, status);
}
CloseHandle (ServerTable.ST_UpdateTimer);
*UpdateObject = NULL;
}
else
{
status = GetLastError ();
Trace (DEBUG_FAILURES, "File: %s, line: %ld."
" Could not create update timer (gle:%ld).",
__FILE__, __LINE__, status);
}
HeapDestroy (ServerTable.ST_Heap);
}
else {
status = GetLastError ();
Trace (DEBUG_FAILURES, "File: %s, line: %ld."
" Could not allocate server table heap (gle:%ld).",
__FILE__, __LINE__, status);
}
return status;
}
/*++
*******************************************************************
D e l e t e S e r v e r T a b l e
Routine Description:
Dispose of server table and associated resources
Arguments:
Return Value:
NO_ERROR - resources were disposed of successfully
other - reason of failure (windows error code)
*******************************************************************
--*/
void
DeleteServerTable (
void
) {
INT i;
while (InterlockedIncrement (&ServerTable.ST_UpdatePending)>0) {
while (ServerTable.ST_UpdatePending!=-1)
Sleep (100);
}
CloseHandle (ServerTable.ST_ExpirationTimer);
CloseHandle (ServerTable.ST_UpdateTimer);
DeleteProtectedList (&ServerTable.ST_SortedListPRM);
DeleteProtectedList (&ServerTable.ST_SortedListTMP);
DeleteProtectedList (&ServerTable.ST_DeletedList);
DeleteProtectedList (&ServerTable.ST_TypeList);
DeleteProtectedList (&ServerTable.ST_IntfList);
DeleteProtectedList (&ServerTable.ST_ExpirationQueue);
DeleteProtectedList (&ServerTable.ST_ChangedSvrsQueue);
for (i=0; i<SDB_NAME_HASH_SIZE; i++) {
DeleteProtectedList (&ServerTable.ST_HashLists[i].HL_List);
ServerTable.ST_HashLists[i].HL_ObjectID = i;
}
DeleteSyncObjPool (&ServerTable.ST_SyncPool);
HeapDestroy (ServerTable.ST_Heap); // Will also destroy all server entries
}
/*++
*******************************************************************
U p d a t e S e r v e r
Routine Description:
Update server in the table (If entry for server does not exist and
hop count parameter is less than 16, it is added to the table, if entry
for the server exists and hop count parameter is 16, server is marked
for deletion, otherwise server info is updated).
Sorted list of servers is not updated immediately
if new server is added or deleted
Arguments:
Server - server parameters (as it comes from IPX packet)
InterfaceIndex - interface through which knowledge of server was obtained
Protocol - protocol used to obtain server info
TimeToLive - time in sec before server is aged out (INFINITE for no aging)
AdvertisingNode - node that from which this server info was received
NewServer - set to TRUE if server was not in the table before
Return Value:
NO_ERROR - server was added/updated ok
other - reason of failure (windows error code)
*******************************************************************
--*/
DWORD
UpdateServer (
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN DWORD Protocol,
IN ULONG TimeToLive,
IN PUCHAR AdvertisingNode,
IN INT Flags,
OUT BOOL *NewServer OPTIONAL
) {
PSDB_HASH_LIST HashList;
PLIST_ENTRY cur, intfLink=NULL, serverLink=NULL;
DWORD status=NO_ERROR;
PSERVER_NODE theNode=NULL, mainNode=NULL;
INT res;
//ASSERT ((Flags&(~(SDB_DONT_RESPOND_NODE_FLAG|SDB_DISABLED_NODE_FLAG)))==0);
if (Server->Name[0]==0) {
Trace (DEBUG_SERVERDB, "Illigal server name in UpdateServer.");
return ERROR_INVALID_PARAMETER;
}
if ( Server-> HopCount > IPX_MAX_HOP_COUNT )
{
Trace(
DEBUG_SERVERDB, "\tUpdateServer : Invalid Hop count"
"type: %04x, hops: %d, name: %.48s.\n",
Server->Type,
Server->HopCount,
Server->Name
);
ASSERTERR( FALSE );
return ERROR_INVALID_PARAMETER;
}
//else
//{
// Trace( DEBUG_SERVERDB, "\tUpdateServer : Hop count ok\n" );
//}
if (ARGUMENT_PRESENT(NewServer))
*NewServer = TRUE;
// First try to locate server in hash list
HashList = &ServerTable.ST_HashLists[HashFunction (Server->Name)];
if (!AcquireServerTableList (&HashList->HL_List, TRUE))
return ERROR_GEN_FAILURE;
cur = HashList->HL_List.PL_Head.Flink;
while (cur!=&HashList->HL_List.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_HASH_TABLE_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator (node)) {
if (Server->Type == node->SN_Server.Type) {
res = IpxNameCmp (Server->Name, node->SN_Server.Name);
if (res==0) {
if (ARGUMENT_PRESENT(NewServer))
*NewServer = FALSE;
// Loop through all entries in the table for
// this server
do {
// If there is another entry with same interface,
// remember its position in interface list
// so new entry can be inserted quickly if
// necessary
if (InterfaceIndex==node->SN_InterfaceIndex)
intfLink = &node->N_Links[SDB_INTF_LIST_LINK];
if ((InterfaceIndex==node->SN_InterfaceIndex)
&& (Protocol == node->SN_Protocol)
&& (IpxNodeCmp (AdvertisingNode,
&node->SN_AdvertisingNode)==0)) {
theNode = node; // Exact match
if (((Flags & SDB_DISABLED_NODE_FLAG)
< (node->N_NodeFlags & SDB_DISABLED_NODE_FLAG))
|| (((Flags & SDB_DISABLED_NODE_FLAG)
== (node->N_NodeFlags & SDB_DISABLED_NODE_FLAG))
&& (Server->HopCount<=node->SN_HopCount))) {
// Hop count is better, than the that
// of the rest, ignore them
if (serverLink==NULL)
serverLink = &theNode->SN_ServerLink;
break;
}
}
else {
// Get the best entry besides the one
// we are updating
if (mainNode==NULL)
mainNode = node;
// Find the place for added/updated entry
// in the list of entries for this server
// (this list is ordered by hop count)
if ((serverLink==NULL)
&& (((Flags & SDB_DISABLED_NODE_FLAG)
< (node->N_NodeFlags & SDB_DISABLED_NODE_FLAG))
|| (((Flags & SDB_DISABLED_NODE_FLAG)
== (node->N_NodeFlags & SDB_DISABLED_NODE_FLAG))
&& (Server->HopCount<=node->SN_HopCount)))) {
serverLink = &node->SN_ServerLink;
// We saw the server and know where
// to place it, break out
if (theNode!=NULL)
break;
}
}
node = CONTAINING_RECORD (node->SN_ServerLink.Flink,
SERVER_NODE,
SN_ServerLink);
VALIDATE_SERVER_NODE(node);
}
// Loop until we are back to best entry
while (!IsMainNode (node));
}
else if (res<0)
// No chance to see the server: the hash is ordered
// be type.name
break;
}
else if (Server->Type<node->SN_Server.Type)
break;
}
cur = cur->Flink;
}
if (theNode!=NULL) {
if ((IpxNetCmp (theNode->SN_Server.Network, Server->Network)!=0)
|| (IpxNodeCmp (theNode->SN_Server.Node, Server->Node)!=0)
|| (IpxSockCmp (theNode->SN_Server.Socket, Server->Socket)!=0)
) {
Trace (DEBUG_FAILURES,
"Address change for server %.4x %.48s:\n"
" Old - %.2x%.2x%.2x%.2x:%.2x%.2x%.2x%.2x%.2x%.2x:%.2x%.2x\n"
" New - %.2x%.2x%.2x%.2x:%.2x%.2x%.2x%.2x%.2x%.2x:%.2x%.2x",
Server->Type, Server->Name,
theNode->SN_Server.Network[0], theNode->SN_Server.Network[1],
theNode->SN_Server.Network[2], theNode->SN_Server.Network[3],
theNode->SN_Server.Node[0], theNode->SN_Server.Node[1],
theNode->SN_Server.Node[2], theNode->SN_Server.Node[3],
theNode->SN_Server.Node[4], theNode->SN_Server.Node[5],
theNode->SN_Server.Socket[0], theNode->SN_Server.Socket[1],
Server->Network[0], Server->Network[1],
Server->Network[2], Server->Network[3],
Server->Node[0], Server->Node[1], Server->Node[2],
Server->Node[3], Server->Node[4], Server->Node[5],
Server->Socket[0], Server->Socket[1]
);
IF_LOG (EVENTLOG_WARNING_TYPE) {
IPX_ADDRESS_BLOCK data[2];
LPSTR str[1] = {(LPSTR)Server->Name};
IpxAddrCpy (&data[0], &theNode->SN_Server);
IpxAddrCpy (&data[1], Server);
RouterLogWarningDataA (RouterEventLogHdl,
ROUTERLOG_IPXSAP_SERVER_ADDRESS_CHANGE,
1, str,
24, (LPBYTE)data);
}
IpxAddrCpy (&theNode->SN_Server, Server);
}
// We already have server in the table
if (IsDisabledNode (theNode))
// Just update the hop count
theNode->SN_HopCount = Server->HopCount;
else if (((Flags & SDB_DISABLED_NODE_FLAG)
!= (theNode->N_NodeFlags & SDB_DISABLED_NODE_FLAG))
|| (Server->HopCount!=theNode->SN_HopCount)) {
// Its hop count changed, we'll have to do something
if (AcquireAllLocks ()) {
theNode->SN_HopCount = Server->HopCount;
if (mainNode==NULL) {
// We haven't seen a node that had or has lower hop count
// theNode is still the best
if (Server->HopCount==IPX_MAX_HOP_COUNT)
DeleteMainNode (theNode);
else {
if (IsEnumerator (CONTAINING_RECORD (
ServerTable.ST_ChangedSvrsQueue.PL_Head.Flink,
SERVER_NODE,
N_Links[SDB_CHANGE_QUEUE_LINK])))
ExpireLRRequests ((PVOID)UlongToPtr(InterfaceIndex));
// Move server to the bottom of change queue
// so those who enumerate through it
// notice that it has changed
RemoveEntryList (&theNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
InsertHeadList (&ServerTable.ST_ChangedSvrsQueue.PL_Head,
&theNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
}
}
else if (!IsMainNode (theNode)
&& (serverLink==&theNode->SN_ServerLink)
&& (Server->HopCount<IPX_MAX_HOP_COUNT))
// theNode was not the best and it is going to stay where
// it is now.
;
else if (IsMainNode (theNode))
// It was the best node. but we saw something better:
// mainNode!=NULL (was checked above)
ChangeMainNode (theNode, mainNode, serverLink);
else if (serverLink==&mainNode->SN_ServerLink)
// It is moving before the mainNode - becoming the best
ChangeMainNode (mainNode, theNode, serverLink);
else if (Server->HopCount<IPX_MAX_HOP_COUNT) {
// Just moving around the list of entries for the
// server
RemoveEntryList (&theNode->SN_ServerLink);
if (serverLink!=NULL) {
// Going before the serverLink
InsertTailList (serverLink, &theNode->SN_ServerLink);
}
else {
// Going to the end of list (circular list:
// end is right before the beginning
InsertTailList (&mainNode->SN_ServerLink,
&theNode->SN_ServerLink);
}
}
else { // Going away (Server->HopCount>=IPX_MAX_HOP_COUNT)
DeleteNode (theNode);
}
ReleaseAllLocks ();
}
else
status = ERROR_GEN_FAILURE;
}
}
else if (Server->HopCount<IPX_MAX_HOP_COUNT) {
// It is not there and it is not dead.
if (mainNode==NULL) {
PLIST_ENTRY link;
// Add a brand new server
theNode = CreateNode (Server, InterfaceIndex, Protocol,
AdvertisingNode, HashList);
if (theNode!=NULL) {
if (AcquireAllLocks ()) {
if (((intfLink=FindIntfLink (InterfaceIndex))!=NULL)
&& ((link=FindTypeLink (Server->Type))!=NULL)) {
ServerTable.ST_ServerCnt += 1;
if (theNode->SN_Protocol==IPX_PROTOCOL_STATIC)
ServerTable.ST_StaticServerCnt += 1;
SetMainNode (theNode);
// Insert in every list
InsertTailList (cur,
&theNode->N_Links[SDB_HASH_TABLE_LINK]);
InsertTailList (link,
&theNode->N_Links[SDB_TYPE_LIST_LINK]);
InsertTailList (intfLink,
&theNode->N_Links[SDB_INTF_LIST_LINK]);
if (IsEnumerator (CONTAINING_RECORD (
ServerTable.ST_ChangedSvrsQueue.PL_Head.Flink,
SERVER_NODE,
N_Links[SDB_CHANGE_QUEUE_LINK])))
ExpireLRRequests ((PVOID)UlongToPtr(InterfaceIndex));
InsertHeadList (&ServerTable.ST_ChangedSvrsQueue.PL_Head,
&theNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
link = FindSortedLink (Server->Type, Server->Name);
InsertTailList (link,
&theNode->N_Links[SDB_SORTED_LIST_LINK]);
ServerTable.ST_TMPListCnt += 1;
// Signal update if too many nodes
if (ServerTable.ST_TMPListCnt == SDBMaxUnsortedServers)
UpdateSortedList ();
}
else {
HeapFree (ServerTable.ST_Heap, 0, theNode);
status = ERROR_NOT_ENOUGH_MEMORY;
}
ReleaseAllLocks ();
}
else {
HeapFree (ServerTable.ST_Heap, 0, theNode);
status = ERROR_GEN_FAILURE;
}
}
else
status = ERROR_NOT_ENOUGH_MEMORY;
}
// Ok, we consider adding it although we have some entries already
else {
// Check for duplicates (different addresses)
if ((IpxNetCmp (mainNode->SN_Server.Network, Server->Network)!=0)
|| (IpxNodeCmp (mainNode->SN_Server.Node, Server->Node)!=0)
|| (IpxSockCmp (mainNode->SN_Server.Socket, Server->Socket)!=0)
) {
Trace (DEBUG_FAILURES,
"Duplicate addresses for server %.4x %.48s:\n"
" 1 - %.2x%.2x%.2x%.2x:%.2x%.2x%.2x%.2x%.2x%.2x:%.2x%.2x"
" from if-%ld, node-%.2x%.2x%.2x%.2x%.2x%.2x\n"
" 2 - %.2x%.2x%.2x%.2x:%.2x%.2x%.2x%.2x%.2x%.2x:%.2x%.2x"
" from if-%ld, node-%.2x%.2x%.2x%.2x%.2x%.2x",
Server->Type, Server->Name,
mainNode->SN_Server.Network[0], mainNode->SN_Server.Network[1],
mainNode->SN_Server.Network[2], mainNode->SN_Server.Network[3],
mainNode->SN_Server.Node[0], mainNode->SN_Server.Node[1],
mainNode->SN_Server.Node[2], mainNode->SN_Server.Node[3],
mainNode->SN_Server.Node[4], mainNode->SN_Server.Node[5],
mainNode->SN_Server.Socket[0], mainNode->SN_Server.Socket[1],
mainNode->SN_InterfaceIndex,
mainNode->SN_AdvertisingNode[0], mainNode->SN_AdvertisingNode[1],
mainNode->SN_AdvertisingNode[2], mainNode->SN_AdvertisingNode[3],
mainNode->SN_AdvertisingNode[4], mainNode->SN_AdvertisingNode[5],
Server->Network[0], Server->Network[1],
Server->Network[2], Server->Network[3],
Server->Node[0], Server->Node[1], Server->Node[2],
Server->Node[3], Server->Node[4], Server->Node[5],
Server->Socket[0], Server->Socket[1],
InterfaceIndex,
AdvertisingNode[0], AdvertisingNode[1], AdvertisingNode[2],
AdvertisingNode[3], AdvertisingNode[4], AdvertisingNode[5]
);
IF_LOG (EVENTLOG_WARNING_TYPE) {
IPX_ADDRESS_BLOCK data[2];
LPSTR str[1] = {(LPSTR)Server->Name};
IpxAddrCpy (&data[0], &mainNode->SN_Server);
IpxAddrCpy (&data[1], Server);
RouterLogWarningDataA (RouterEventLogHdl,
ROUTERLOG_IPXSAP_SERVER_DUPLICATE_ADDRESSES,
1, str,
24, (LPBYTE)data);
}
}
// Collect all servers when routing
if (Routing) {
theNode = CreateNode (Server, InterfaceIndex, Protocol,
AdvertisingNode, HashList);
if (theNode!=NULL) {
if (AcquireAllLocks ()) {
if ((intfLink!=NULL)
|| ((intfLink=FindIntfLink (InterfaceIndex))!=NULL)) {
if (theNode->SN_Protocol==IPX_PROTOCOL_STATIC)
ServerTable.ST_StaticServerCnt += 1;
InsertTailList (intfLink,
&theNode->N_Links[SDB_INTF_LIST_LINK]);
if ((Server->HopCount<mainNode->SN_HopCount)
|| IsDisabledNode (mainNode))
// Replaces the best node
ChangeMainNode (mainNode, theNode, NULL);
else if (serverLink!=NULL) {
// Going before the serverLink
InsertTailList (serverLink, &theNode->SN_ServerLink);
}
else {
// Going to the end of list (circular list:
// the end is right before the beginning)
InsertTailList (&mainNode->SN_ServerLink,
&theNode->SN_ServerLink);
}
}
else {
HeapFree (ServerTable.ST_Heap, 0, theNode);
status = ERROR_GEN_FAILURE;
}
ReleaseAllLocks ();
}
else {
HeapFree (ServerTable.ST_Heap, 0, theNode);
status = ERROR_GEN_FAILURE;
}
}
else
status = ERROR_NOT_ENOUGH_MEMORY;
}
else if (serverLink!=NULL) {
// If is better than one of ours
if (AcquireAllLocks ()) {
if ((intfLink!=NULL)
|| ((intfLink=FindIntfLink (InterfaceIndex))!=NULL)) {
// Replace the worst one (at the end of server list)
theNode = CONTAINING_RECORD (
mainNode->SN_ServerLink.Blink,
SERVER_NODE,
SN_ServerLink);
VALIDATE_SERVER_NODE(theNode);
IpxServerCpy (&theNode->SN_Server, Server);
IpxNodeCpy (theNode->SN_AdvertisingNode, AdvertisingNode);
theNode->SN_InterfaceIndex = InterfaceIndex;
ResetDisabledNode (theNode);
if (theNode->SN_Protocol!=Protocol) {
if (Protocol==IPX_PROTOCOL_STATIC)
ServerTable.ST_StaticServerCnt += 1;
else if (theNode->SN_Protocol==IPX_PROTOCOL_STATIC)
ServerTable.ST_StaticServerCnt -= 1;
theNode->SN_Protocol = Protocol;
}
if (intfLink!=&theNode->N_Links[SDB_INTF_LIST_LINK]) {
RemoveEntryList (&theNode->N_Links[SDB_INTF_LIST_LINK]);
InsertTailList (intfLink,
&theNode->N_Links[SDB_INTF_LIST_LINK]);
}
if (theNode==mainNode) {
if (IsEnumerator (CONTAINING_RECORD (
ServerTable.ST_ChangedSvrsQueue.PL_Head.Flink,
SERVER_NODE,
N_Links[SDB_CHANGE_QUEUE_LINK])))
ExpireLRRequests ((PVOID)UlongToPtr(InterfaceIndex));
// It's already the best, just move it to the
// bottom of change queue
RemoveEntryList (&theNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
InsertHeadList (&ServerTable.ST_ChangedSvrsQueue.PL_Head,
&theNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
}
else if ((theNode->SN_HopCount < mainNode->SN_HopCount)
|| IsDisabledNode (mainNode))
// It replaces the best one
ChangeMainNode (mainNode, theNode, serverLink);
else if (serverLink!=&theNode->SN_ServerLink) {
// It just gets in the middle
RemoveEntryList (&theNode->SN_ServerLink);
InsertTailList (serverLink, &theNode->SN_ServerLink);
}
}
else
status = ERROR_GEN_FAILURE;
ReleaseAllLocks ();
}
else
status = ERROR_GEN_FAILURE;
}
}
}
// Update position in expiration queue
if ((status==NO_ERROR)
&& (theNode!=NULL)
&& (Server->HopCount!=IPX_MAX_HOP_COUNT) // theNode could not have
){ // been deleted or setup for deletion
// Update flags
theNode->N_NodeFlags = (theNode->N_NodeFlags & (~(SDB_DISABLED_NODE_FLAG|SDB_DONT_RESPOND_NODE_FLAG)))
| (Flags & (SDB_DISABLED_NODE_FLAG|SDB_DONT_RESPOND_NODE_FLAG));
if (AcquireServerTableList (&ServerTable.ST_ExpirationQueue, TRUE)) {
if (IsListEntry (&theNode->SN_TimerLink))
RemoveEntryList (&theNode->SN_TimerLink);
if (TimeToLive!=INFINITE) {
ASSERTMSG ("Invalid value of time to live ",
TimeToLive*1000<MAXULONG/2);
theNode->SN_ExpirationTime =
GetTickCount()+TimeToLive*1000;
RoundUpToSec (theNode->SN_ExpirationTime);
// Scan expiration queue from the end (to minimize
// the number of nodes we have to look through)
cur = ServerTable.ST_ExpirationQueue.PL_Head.Blink;
while (cur!=&ServerTable.ST_ExpirationQueue.PL_Head) {
if (IsLater(theNode->SN_ExpirationTime,
CONTAINING_RECORD (
cur,
SERVER_NODE,
SN_TimerLink)->SN_ExpirationTime))
break;
cur = cur->Blink;
}
InsertHeadList (cur, &theNode->SN_TimerLink);
if (cur==&ServerTable.ST_ExpirationQueue.PL_Head) {
// Signal timer if server is in the beginning
// of the list (we need to get a shot
// earlier than we previously requested)
LONGLONG timeout = (LONGLONG)TimeToLive*(1000*(-10000));
BOOL res = SetWaitableTimer (
ServerTable.ST_ExpirationTimer,
(PLARGE_INTEGER)&timeout,
0, // no period
NULL, NULL, // no completion
FALSE); // no need to resume
ASSERTERRMSG ("Could not set expiraton timer ", res);
}
}
else {
InitializeListEntry (&theNode->SN_TimerLink);
}
ReleaseServerTableList (&ServerTable.ST_ExpirationQueue);
}
else
status = ERROR_GEN_FAILURE;
}
ReleaseServerTableList (&HashList->HL_List);
return status;
}
/*++
*******************************************************************
C r e a t e N o d e
Routine Description:
Allocate and initialize new server entry
Arguments:
Server - server parameters (as it comes from IPX packet)
InterfaceIndex - interface through which knowledge of server was obtained
Protocol - protocol used to obtain server info
AdvertisingNode - node from which this server info was received
HashList - hash list to which this server belongs
Return Value:
Allocated and initialized entry
NULL if allocation failed
*******************************************************************
--*/
PSERVER_NODE
CreateNode (
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN DWORD Protocol,
IN PUCHAR AdvertisingNode,
IN PSDB_HASH_LIST HashList
) {
PSERVER_NODE theNode;
theNode = (PSERVER_NODE)HeapAlloc (ServerTable.ST_Heap, 0, sizeof (SERVER_NODE));
if (theNode==NULL) {
Trace (DEBUG_FAILURES,
"File: %s, line: %ld. Can't allocate server node (gle:%ld).",
__FILE__, __LINE__, GetLastError ());
SetLastError (ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
theNode->N_NodeFlags = SDB_SERVER_NODE;
theNode->SN_HashList = HashList;
theNode->SN_InterfaceIndex = InterfaceIndex;
theNode->SN_Protocol = Protocol;
theNode->SN_ObjectID = SDB_INVALID_OBJECT_ID;
IpxNodeCpy (theNode->SN_AdvertisingNode, AdvertisingNode);
theNode->SN_Signature = SDB_SERVER_NODE_SIGNATURE;
IpxServerCpy (&theNode->SN_Server, Server);
InitializeListEntry (&theNode->N_Links[SDB_HASH_TABLE_LINK]);
InitializeListEntry (&theNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
InitializeListEntry (&theNode->N_Links[SDB_INTF_LIST_LINK]);
InitializeListEntry (&theNode->N_Links[SDB_TYPE_LIST_LINK]);
InitializeListEntry (&theNode->N_Links[SDB_SORTED_LIST_LINK]);
InitializeListEntry (&theNode->SN_ServerLink);
InitializeListEntry (&theNode->SN_TimerLink);
return theNode;
}
/*++
*******************************************************************
C h a n g e M a i n N o d e
Routine Description:
Replace best entry for server (moves new best entry to the
top of the server list, replaces old entry in hash, type,
and sorted lists. Adds new entry to interface list if it
is not already there
All lists used for enumeration should be locked when calling this routine
Arguments:
oldNode - Current best entry
newNode - Node that will become the best
serverLink - Where oldNode has to go in server list:
if newNode not in the list or
serverLink==&oldNode->SN_ServerLink, oldNode
gets pushed down by newNode
if serverLink==NULL, oldNode goes to the end of list
otherwise it goes before serverLink
Return Value:
NO_ERROR - server was added/updated ok
other - reason of failure (windows error code)
*******************************************************************
--*/
VOID
ChangeMainNode (
IN PSERVER_NODE oldNode,
IN PSERVER_NODE newNode,
IN PLIST_ENTRY serverLink
) {
ASSERTMSG ("Node is already main ", !IsMainNode (newNode));
SetMainNode (newNode);
ASSERTMSG ("Node being reset is not main ", IsMainNode (oldNode));
ResetMainNode (oldNode);
if (oldNode->SN_ObjectID!=SDB_INVALID_OBJECT_ID) {
newNode->SN_ObjectID = oldNode->SN_ObjectID;
oldNode->SN_ObjectID = SDB_INVALID_OBJECT_ID;
}
InsertTailList (&oldNode->N_Links[SDB_HASH_TABLE_LINK],
&newNode->N_Links[SDB_HASH_TABLE_LINK]);
RemoveEntryList (&oldNode->N_Links[SDB_HASH_TABLE_LINK]);
InitializeListEntry (&oldNode->N_Links[SDB_HASH_TABLE_LINK]);
RemoveEntryList (&oldNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
InitializeListEntry (&oldNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
if (IsEnumerator (CONTAINING_RECORD (
ServerTable.ST_ChangedSvrsQueue.PL_Head.Flink,
SERVER_NODE,
N_Links[SDB_CHANGE_QUEUE_LINK])))
ExpireLRRequests ((PVOID)UlongToPtr(newNode->SN_InterfaceIndex));
InsertHeadList (&ServerTable.ST_ChangedSvrsQueue.PL_Head,
&newNode->N_Links[SDB_CHANGE_QUEUE_LINK]);
InsertTailList (&oldNode->N_Links[SDB_TYPE_LIST_LINK],
&newNode->N_Links[SDB_TYPE_LIST_LINK]);
RemoveEntryList (&oldNode->N_Links[SDB_TYPE_LIST_LINK]);
InitializeListEntry (&oldNode->N_Links[SDB_TYPE_LIST_LINK]);
if (!IsListEntry (&newNode->SN_ServerLink)) {
InsertTailList (&oldNode->SN_ServerLink, &newNode->SN_ServerLink);
}
else if (serverLink==&oldNode->SN_ServerLink) {
RemoveEntryList (&newNode->SN_ServerLink);
InsertTailList (&oldNode->SN_ServerLink, &newNode->SN_ServerLink);
}
else if (serverLink!=NULL) {
RemoveEntryList (&oldNode->SN_ServerLink);
InsertHeadList (serverLink, &oldNode->SN_ServerLink);
}
if (oldNode->SN_HopCount==IPX_MAX_HOP_COUNT) {
DeleteNode (oldNode);
}
serverLink = FindSortedLink (newNode->SN_Server.Type,
newNode->SN_Server.Name);
if (!IsListEntry (&newNode->N_Links[SDB_SORTED_LIST_LINK])) {
InsertTailList (serverLink, &newNode->N_Links[SDB_SORTED_LIST_LINK]);
ServerTable.ST_TMPListCnt += 1;
if (ServerTable.ST_TMPListCnt == SDBMaxUnsortedServers)
UpdateSortedList ();
}
}
/*++
*******************************************************************
A c q u i r e A l l L o c k s
Routine Description:
Acquire locks for all lists that are updated immediately
when server is added/deleted/updated
Arguments:
None
Return Value:
NO_ERROR - server was added/updated ok
other - reason of failure (windows error code)
*******************************************************************
--*/
BOOL
AcquireAllLocks (
void
) {
if (AcquireServerTableList (&ServerTable.ST_ChangedSvrsQueue, TRUE)) {
if (AcquireServerTableList (&ServerTable.ST_IntfList, TRUE)) {
if (AcquireServerTableList (&ServerTable.ST_TypeList, TRUE)) {
if (AcquireServerTableList (&ServerTable.ST_SortedListTMP, TRUE))
return TRUE;
ReleaseServerTableList (&ServerTable.ST_TypeList);
}
ReleaseServerTableList (&ServerTable.ST_IntfList);
}
ReleaseServerTableList (&ServerTable.ST_ChangedSvrsQueue);
}
return FALSE;
}
/*++
*******************************************************************
R e l e a s e A l l L o c k s
Routine Description:
Release locks for all lists that are updated immediately
when server is added/deleted/updated
Arguments:
None
Return value:
None
*******************************************************************
--*/
VOID
ReleaseAllLocks (
void
) {
ReleaseServerTableList (&ServerTable.ST_SortedListTMP);
ReleaseServerTableList (&ServerTable.ST_TypeList);
ReleaseServerTableList (&ServerTable.ST_IntfList);
ReleaseServerTableList (&ServerTable.ST_ChangedSvrsQueue);
}
/*++
*******************************************************************
D e l e t e M a i n N o d e
Routine Description:
Delete entry that was best (it still remains in the table for
a while until all interested get a chance to learn this
All lists used for enumeration should be locked when calling this routine
Arguments:
node - entry to delete
Return Value:
None
*******************************************************************
--*/
VOID
DeleteMainNode (
IN PSERVER_NODE node
) {
RemoveEntryList (&node->N_Links[SDB_HASH_TABLE_LINK]);
InitializeListEntry (&node->N_Links[SDB_HASH_TABLE_LINK]);
RemoveEntryList (&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
InitializeListEntry (&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
RemoveEntryList (&node->N_Links[SDB_INTF_LIST_LINK]);
InitializeListEntry (&node->N_Links[SDB_INTF_LIST_LINK]);
RemoveEntryList (&node->N_Links[SDB_TYPE_LIST_LINK]);
InitializeListEntry (&node->N_Links[SDB_TYPE_LIST_LINK]);
ServerTable.ST_ServerCnt -= 1;
if (node->SN_Protocol==IPX_PROTOCOL_STATIC)
ServerTable.ST_StaticServerCnt -= 1;
if (ServerTable.ST_LastEnumerator==NULL) {
ASSERTMSG ("Node being reset is not main ", IsMainNode (node));
ResetMainNode (node);
// We won't try to get access to sorted list because it is
// slow, the entry will be actually removed from it
// and disposed of when the sorted list is updated
if (AcquireServerTableList (&ServerTable.ST_DeletedList, TRUE)) {
InsertTailList (&ServerTable.ST_DeletedList.PL_Head,
&node->SN_ServerLink);
ServerTable.ST_DeletedListCnt += 1;
if (ServerTable.ST_DeletedListCnt==SDBMaxUnsortedServers)
UpdateSortedList ();
ReleaseServerTableList (&ServerTable.ST_DeletedList);
}
// If we fail in locking we just let it hang around
// (at least we won't risk damaging the list)
}
else {
// If there are enumerators in change queue, we can't
// delete the node until they see it
if (IsEnumerator (CONTAINING_RECORD (
ServerTable.ST_ChangedSvrsQueue.PL_Head.Flink,
SERVER_NODE,
N_Links[SDB_CHANGE_QUEUE_LINK])))
ExpireLRRequests ((PVOID)UlongToPtr(node->SN_InterfaceIndex));
InsertHeadList (&ServerTable.ST_ChangedSvrsQueue.PL_Head,
&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
}
}
/*++
*******************************************************************
D e l e t e N o d e
Routine Description:
Delete entry that was not the best
All lists used for enumeration should be locked when calling this routine
Arguments:
node - entry to delete
Return Value:
None
*******************************************************************
--*/
VOID
DeleteNode (
IN PSERVER_NODE node
) {
RemoveEntryList (&node->N_Links[SDB_INTF_LIST_LINK]);
InitializeListEntry (&node->N_Links[SDB_INTF_LIST_LINK]);
RemoveEntryList (&node->SN_ServerLink);
if (node->SN_Protocol==IPX_PROTOCOL_STATIC)
ServerTable.ST_StaticServerCnt -= 1;
if (AcquireServerTableList (&ServerTable.ST_DeletedList, TRUE)) {
// We won't try to get access to sorted list because it is
// slow, the entry will be actually removed from it
// and disposed of when the sorted list is updated
InsertTailList (&ServerTable.ST_DeletedList.PL_Head,
&node->SN_ServerLink);
ServerTable.ST_DeletedListCnt += 1;
if (ServerTable.ST_DeletedListCnt==SDBMaxUnsortedServers)
UpdateSortedList ();
ReleaseServerTableList (&ServerTable.ST_DeletedList);
}
else {
// If we fail in locking we just let it hang around
// (at least we won't risk damaging the list)
InitializeListEntry (&node->SN_ServerLink);
}
}
/*++
*******************************************************************
D o U p d a t e S o r t e d L i s t
Routine Description:
Deletes entries placed in deleted list and merges temporary and
permanent sorted lists.
This routine may take some time to execute because it may need to scan
the whole sorted list that contains all entries in the table
Arguments:
None
Return Value:
None
*******************************************************************
--*/
VOID
DoUpdateSortedList (
void
) {
PLIST_ENTRY cur;
ULONG curCount;
LIST_ENTRY tempHead;
// We first lock the 'slow' list
if (!AcquireServerTableList (&ServerTable.ST_SortedListPRM, TRUE))
// Failure to acquire sorted list,
// tell them to retry in a little while
return ;
// The following two list are locked for a short period:
// we'll just delete what needs to be deleted (no searching)
// and copy and reset temp sorted list
if (!AcquireServerTableList (&ServerTable.ST_ExpirationQueue, TRUE)) {
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
// Failure to acquire expiration queue,
// tell them to retry in a little while
return ;
}
if (!AcquireServerTableList (&ServerTable.ST_SortedListTMP, TRUE)) {
ReleaseServerTableList (&ServerTable.ST_ExpirationQueue);
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
// Failure to acquire sorted list,
// tell them to retry in a little while
return ;
}
if (!AcquireServerTableList (&ServerTable.ST_DeletedList, TRUE)) {
ReleaseServerTableList (&ServerTable.ST_SortedListTMP);
ReleaseServerTableList (&ServerTable.ST_ExpirationQueue);
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
// Failure to acquire deleted list,
// tell them to retry in a little while
return ;
}
// Delete what we have to delete
cur = ServerTable.ST_DeletedList.PL_Head.Flink;
while (cur != &ServerTable.ST_DeletedList.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
SN_ServerLink);
VALIDATE_SERVER_NODE(node);
cur = cur->Flink;
RemoveEntryList (&node->SN_ServerLink);
if (IsListEntry (&node->N_Links[SDB_SORTED_LIST_LINK])) {
RemoveEntryList (&node->N_Links[SDB_SORTED_LIST_LINK]);
}
if (IsListEntry (&node->SN_TimerLink)) {
RemoveEntryList (&node->SN_TimerLink);
}
ASSERTMSG ("Deleted entry is still in hash list ",
!IsListEntry (&node->N_Links[SDB_HASH_TABLE_LINK]));
ASSERTMSG ("Deleted entry is still in change queue ",
!IsListEntry (&node->N_Links[SDB_CHANGE_QUEUE_LINK]));
ASSERTMSG ("Deleted entry is still in interface list ",
!IsListEntry (&node->N_Links[SDB_INTF_LIST_LINK]));
ASSERTMSG ("Deleted entry is still in type list ",
!IsListEntry (&node->N_Links[SDB_TYPE_LIST_LINK]));
HeapFree (ServerTable.ST_Heap, 0, node);
}
ReleaseServerTableList (&ServerTable.ST_ExpirationQueue);
ServerTable.ST_DeletedListCnt = 0;
ReleaseServerTableList (&ServerTable.ST_DeletedList);
// Now, just copy the head of the temp list,
// so we won't delay others while processing it
if (!IsListEmpty (&ServerTable.ST_SortedListTMP.PL_Head)) {
InsertTailList (&ServerTable.ST_SortedListTMP.PL_Head, &tempHead);
RemoveEntryList (&ServerTable.ST_SortedListTMP.PL_Head);
InitializeListHead (&ServerTable.ST_SortedListTMP.PL_Head);
}
else
InitializeListHead (&tempHead);
ServerTable.ST_TMPListCnt = 0; // We are going to remove all of them,
ReleaseServerTableList (&ServerTable.ST_SortedListTMP);
// Now we start the merge
cur = ServerTable.ST_SortedListPRM.PL_Head.Flink;
while (!IsListEmpty (&tempHead)) {
PSERVER_NODE prmNode = NULL;
PSERVER_NODE tmpNode;
tmpNode = CONTAINING_RECORD (tempHead.Flink,
SERVER_NODE,
N_Links[SDB_SORTED_LIST_LINK]);
VALIDATE_SERVER_NODE(tmpNode);
while (cur!=&ServerTable.ST_SortedListPRM.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_SORTED_LIST_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator (node)) {
if (tmpNode->SN_Server.Type==node->SN_Server.Type) {
INT res = IpxNameCmp (tmpNode->SN_Server.Name,
node->SN_Server.Name);
if (res==0) {
cur = cur->Flink;
prmNode = node;
break;
}
else if (res<0)
break;
}
else if (tmpNode->SN_Server.Type<node->SN_Server.Type)
break;
}
cur = cur->Flink;
}
if (AcquireServerTableList (&tmpNode->SN_HashList->HL_List, TRUE)) {
if (AcquireServerTableList (&ServerTable.ST_SortedListTMP, TRUE)) {
RemoveEntryList (&tmpNode->N_Links[SDB_SORTED_LIST_LINK]);
if (IsMainNode (tmpNode)) {
ASSERTMSG ("Node marked as sorted in temp list ",
!IsSortedNode (tmpNode));
SetSortedNode (tmpNode);
InsertTailList (cur, &tmpNode->N_Links[SDB_SORTED_LIST_LINK]);
if (prmNode!=NULL) {
ASSERTMSG ("Node not marked as sorted in sorted list ",
IsSortedNode (prmNode));
RemoveEntryList (&prmNode->N_Links[SDB_SORTED_LIST_LINK]);
InitializeListEntry (&prmNode->N_Links[SDB_SORTED_LIST_LINK]);
ResetSortedNode (prmNode);
}
}
else {
InitializeListEntry (&tmpNode->N_Links[SDB_SORTED_LIST_LINK]);
}
ReleaseServerTableList (&ServerTable.ST_SortedListTMP);
}
else
Sleep (SAP_ERROR_COOL_OFF_TIME);
ReleaseServerTableList (&tmpNode->SN_HashList->HL_List);
}
else
Sleep (SAP_ERROR_COOL_OFF_TIME);
}
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
}
VOID APIENTRY
UpdateSortedListWorker (
PVOID context
) {
do {
InterlockedExchange (&ServerTable.ST_UpdatePending, 0);
DoUpdateSortedList ();
}
while (InterlockedDecrement (&ServerTable.ST_UpdatePending)>=0);
}
/*++
*******************************************************************
U p d a t e S o r t e d L i s t
Routine Description:
Schedules work item to update sorted list.
Should be called whenever UpdateObject is signalled
Arguments:
None
Return Value:
None
*******************************************************************
--*/
VOID
UpdateSortedList (
void
) {
BOOL res;
LONGLONG timeout=(LONGLONG)SDBSortLatency*(-10000);
static WORKERFUNCTION worker=&UpdateSortedListWorker;
res = SetWaitableTimer (ServerTable.ST_UpdateTimer,
(PLARGE_INTEGER)&timeout,
0, // no period
NULL, NULL, // no completion
FALSE); // no need to resume
ASSERTMSG ("Could not set update timer ", res);
if (InterlockedIncrement (&ServerTable.ST_UpdatePending)==0)
ScheduleWorkItem (&worker);
}
/*++
*******************************************************************
P r o c e s s E x p i r a t i o n Q u e u e
Routine Description:
Deletes expired servers from the table and set timer object to
be signalled when next item in expiration queue is due
Arguments:
None
Return Value:
None
*******************************************************************
--*/
VOID
ProcessExpirationQueue (
void
) {
ULONG curTime = GetTickCount ();
ULONG dueTime = curTime + MAXULONG/2;
LONGLONG timeout;
BOOL res;
if (!AcquireServerTableList (&ServerTable.ST_ExpirationQueue, TRUE))
return ;
while (!IsListEmpty (&ServerTable.ST_ExpirationQueue.PL_Head)) {
PSDB_HASH_LIST HashList;
PSERVER_NODE node = CONTAINING_RECORD (
ServerTable.ST_ExpirationQueue.PL_Head.Flink,
SERVER_NODE,
SN_TimerLink);
VALIDATE_SERVER_NODE(node);
if (IsLater(node->SN_ExpirationTime,curTime)) {
dueTime = node->SN_ExpirationTime;
break;
}
HashList = node->SN_HashList;
// Try to get access to hash list but do not wait because
// we may create a deadlock
if (!AcquireServerTableList (&HashList->HL_List, FALSE)) {
// Hash list is locked, we'll have to release the timer queue
// and reacquire it again after securing the hash list
ReleaseServerTableList (&ServerTable.ST_ExpirationQueue);
if (AcquireServerTableList (&HashList->HL_List, TRUE)) {
if (AcquireServerTableList (&ServerTable.ST_ExpirationQueue, TRUE)) {
// Make sure entry is still there
if (ServerTable.ST_ExpirationQueue.PL_Head.Flink
!=&node->SN_TimerLink) {
// Gone already, go to the next one
ReleaseServerTableList (&HashList->HL_List);
continue;
}
}
else {
// Failure to regain expiration queue,
// tell them to retry in a little while
ReleaseServerTableList (&HashList->HL_List);
return ;
}
}
else
// Failure to acquire hash list,
// tell them to retry in a little while
return ;
}
// At this point we have hash list and expiration queue locks
// we can proceed with deletion
RemoveEntryList (&node->SN_TimerLink);
InitializeListEntry (&node->SN_TimerLink);
if (node->SN_HopCount!=IPX_MAX_HOP_COUNT) {
// It might have been already prepeared for deletion
if (AcquireAllLocks ()) { // Need to have all locks before changing
// node info
node->SN_HopCount = IPX_MAX_HOP_COUNT;
if (IsMainNode (node)) {
if (IsListEmpty (&node->SN_ServerLink))
DeleteMainNode (node);
else
ChangeMainNode (
node,
CONTAINING_RECORD (
node->SN_ServerLink.Flink,
SERVER_NODE,
SN_ServerLink),
NULL);
}
else
DeleteNode (node);
ReleaseAllLocks ();
}
}
ReleaseServerTableList (&HashList->HL_List);
}
ReleaseServerTableList (&ServerTable.ST_ExpirationQueue);
timeout = (LONGLONG)(dueTime-curTime)*(-10000);
res = SetWaitableTimer (ServerTable.ST_ExpirationTimer,
(PLARGE_INTEGER)&timeout,
0, // no period
NULL, NULL, // no completion
FALSE); // no need to resume
ASSERTMSG ("Could not set expiration timer ", res);
}
/*++
*******************************************************************
Q u e r y S e r v e r
Routine Description:
Checks if server with given type and name exists in the table
Returns TRUE if it does and fills out requested server info
with data of the best entry for the server
Arguments:
Type - server type
Name - server name
Server - buffer in which to put server info
InterfaceIndex - buffer in which to put server interface index
Protocol - buffer in which to put server protocol
ObjectID - buffer in which to put server object id (number that uniquely
identifies server (the whole set of entries, not just the best
one) in the table; it is valid for very long but FINITE period
of time)
Return Value:
TRUE - server was found
FALSE - server was not found or operation failed (call GetLastError()
to find out the reason for failure if any)
*******************************************************************
--*/
BOOL
QueryServer (
IN USHORT Type,
IN PUCHAR Name,
OUT PIPX_SERVER_ENTRY_P Server OPTIONAL,
OUT PULONG InterfaceIndex OPTIONAL,
OUT PULONG Protocol OPTIONAL,
OUT PULONG ObjectID OPTIONAL
) {
PSDB_HASH_LIST HashList;
PLIST_ENTRY cur;
PSERVER_NODE theNode = NULL;
INT res;
if (Name[0]==0) {
Trace (DEBUG_SERVERDB, "Illigal server name in QueryServer.");
SetLastError (ERROR_INVALID_PARAMETER);
return FALSE;
}
HashList = &ServerTable.ST_HashLists[HashFunction (Name)];
if (!AcquireServerTableList (&HashList->HL_List, TRUE)) {
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
cur = HashList->HL_List.PL_Head.Flink;
while (cur!=&HashList->HL_List.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_HASH_TABLE_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator (node) && !IsDisabledNode (node)
&& (node->SN_Server.HopCount < IPX_MAX_HOP_COUNT)) {
if (Type == node->SN_Server.Type) {
res = IpxNameCmp (Name, node->SN_Server.Name);
if (res==0) {
theNode = node;
break;
}
else if (res<0)
break;
}
else if (Type<node->SN_Server.Type)
break;
}
cur = cur->Flink;
}
if (theNode!=NULL) {
if (ARGUMENT_PRESENT (Server))
IpxServerCpy (Server, &theNode->SN_Server);
if (ARGUMENT_PRESENT (InterfaceIndex))
*InterfaceIndex = theNode->SN_InterfaceIndex;
if (ARGUMENT_PRESENT (Protocol))
*Protocol = theNode->SN_Protocol;
if (ARGUMENT_PRESENT (ObjectID)) {
if (theNode->SN_ObjectID==SDB_INVALID_OBJECT_ID)
theNode->SN_ObjectID = GenerateUniqueID (theNode->SN_HashList);
*ObjectID = theNode->SN_ObjectID;
}
res = TRUE;
}
else {
SetLastError (NO_ERROR);
res = FALSE;
}
ReleaseServerTableList (&HashList->HL_List);
return res==TRUE;
}
/*++
*******************************************************************
G e t S e r v e r F r o m I D
Routine Description:
Returns info for server with specified ID
Arguments:
ObjectID - server object id (number that uniquely
identifies server in the table, it is valid for very long
but FINITE amount of time)
Server - buffer in which to put server info
InterfaceIndex - buffer in which to put server interface index
Protocol - buffer in which to put server protocol
Return Value:
TRUE - server was found
FALSE - server was not found or operation failed (call GetLastError()
to find out the reason for failure if any)
*******************************************************************
--*/
BOOL
GetServerFromID (
IN ULONG ObjectID,
OUT PIPX_SERVER_ENTRY_P Server OPTIONAL,
OUT PULONG InterfaceIndex OPTIONAL,
OUT PULONG Protocol OPTIONAL
) {
PSDB_HASH_LIST HashList;
PLIST_ENTRY cur;
PSERVER_NODE theNode = NULL;
INT res;
HashList = &ServerTable.ST_HashLists[ObjectID%SDB_NAME_HASH_SIZE];
if (!AcquireServerTableList (&HashList->HL_List, TRUE)) {
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
cur = HashList->HL_List.PL_Head.Flink;
while (cur!=&HashList->HL_List.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_HASH_TABLE_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator (node) && !IsDisabledNode (node)
&& (node->SN_HopCount < IPX_MAX_HOP_COUNT)
&& (node->SN_ObjectID == ObjectID)) {
theNode = node;
break;
}
cur = cur->Flink;
}
if (theNode!=NULL) {
if (ARGUMENT_PRESENT (Server))
IpxServerCpy (Server, &theNode->SN_Server);
if (ARGUMENT_PRESENT (InterfaceIndex))
*InterfaceIndex = theNode->SN_InterfaceIndex;
if (ARGUMENT_PRESENT (Protocol))
*Protocol = theNode->SN_Protocol;
res = TRUE;
}
else {
SetLastError (NO_ERROR);
res = FALSE;
}
ReleaseServerTableList (&HashList->HL_List);
return res==TRUE;
}
/*++
*******************************************************************
C r e a t e L i s t E n u m e r a t o r
Routine Description:
Creates enumerator node that allows scanning through the server
table lists
Arguments:
ListIdx - index of list through which to scan (currently supported lists
are: hash lists, interface lists, type lists,
changed servers queue
Type - limits enumeration to servers of specific type and
indentifies a particular type list if index is SDB_TYPE_LIST_IDX
(use 0xFFFF to return all server and/or to go through all
type lists)
Name - limits enumeration to servers with certain name if present
InterfaceIndex - limits enumeration to servers of specific interface and
indentifies a particular interface list if index
is SDB_INTF_LIST_IDX (use INVALID_INTERFACE_INDEX to return all
server and/or to go through all interface lists)
Protocol - limits enumeration to servers of certain protocol (0xFFFFFFFF
- all protocols)
Flags - identifies additional conditions on entries enumerated:
SDB_MAIN_NODE_FLAG - only best servers
SDB_DISABLED_NODE_FLAG - include disabled servers
Return Value:
Handle that represents the enumeration node
NULL if specified list does not exist or operation failed
(call GetLastError () for the reason of failure if any)
*******************************************************************
--*/
HANDLE
CreateListEnumerator (
IN INT ListIdx,
IN USHORT Type,
IN PUCHAR Name OPTIONAL,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN INT Flags
) {
HANDLE hEnum;
#define enumNode ((PENUMERATOR_NODE)hEnum)
hEnum = (HANDLE)GlobalAlloc (GPTR, sizeof (ENUMERATOR_NODE));
if (hEnum==NULL) {
Trace (DEBUG_FAILURES,
"File: %s, line: %ld. Can't allocate enumerator node (gle:%ld).",
__FILE__, __LINE__, GetLastError ());
SetLastError (ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
InitializeListEntry (&enumNode->N_Links[ListIdx]);
enumNode->N_NodeFlags = SDB_ENUMERATION_NODE;
enumNode->EN_LinkIdx = ListIdx;
enumNode->EN_InterfaceIndex = InterfaceIndex;
enumNode->EN_Protocol = Protocol;
enumNode->EN_Signature = SDB_ENUMERATOR_NODE_SIGNATURE;
enumNode->EN_Type = Type;
if (ARGUMENT_PRESENT(Name)) {
if (Name[0]!=0) {
enumNode->EN_ListLock = &ServerTable.ST_HashLists[HashFunction(Name)].HL_List;
IpxNameCpy (enumNode->EN_Name, Name);
}
else {
Trace (DEBUG_SERVERDB, "Illigal server name in CreateListEnumerator.");
GlobalFree (enumNode);
SetLastError (ERROR_INVALID_PARAMETER);
return NULL;
}
}
else
enumNode->EN_Name[0] = 0;
enumNode->EN_Flags = Flags;
switch (ListIdx) {
case SDB_HASH_TABLE_LINK:
if (enumNode->EN_Name[0]==0)
enumNode->EN_ListLock = &ServerTable.ST_HashLists[0].HL_List;
break;
case SDB_CHANGE_QUEUE_LINK:
enumNode->EN_ListLock = &ServerTable.ST_ChangedSvrsQueue;
break;
case SDB_INTF_LIST_LINK:
enumNode->EN_ListLock = &ServerTable.ST_IntfList;
break;
case SDB_TYPE_LIST_LINK:
enumNode->EN_ListLock = &ServerTable.ST_TypeList;
break;
default:
ASSERTMSG ("Invalid list index. ", FALSE);
GlobalFree (hEnum);
SetLastError (ERROR_INVALID_PARAMETER);
return NULL;
}
if (!AcquireServerTableList (enumNode->EN_ListLock, TRUE)) {
GlobalFree (hEnum);
SetLastError (ERROR_GEN_FAILURE);
return NULL;
}
// All enumeration go in the direction opposite to
// direction of insertion to exclude the possibility of
// returning the same server twice (this may happen if
// server entry gets deleted and another one is inserted in
// the same place while client processes the result of
// enumeration callback
switch (ListIdx) {
case SDB_HASH_TABLE_LINK:
enumNode->EN_ListHead = &enumNode->EN_ListLock->PL_Head;
// Insert in the tail of the list -> we go backwards
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
break;
case SDB_CHANGE_QUEUE_LINK:
enumNode->EN_ListHead = &ServerTable.ST_ChangedSvrsQueue.PL_Head;
// Insert in the head, because we want client to see only
// the newly changed servers that will be inserted in the
// bottom (head) of the list
InsertHeadList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
// Increment number of enumerating clients (we remove deleted
// server entries from the change queue once all enumerating clients
// get a chance to see it)
if (ServerTable.ST_LastEnumerator==NULL)
ServerTable.ST_LastEnumerator = hEnum;
break;
case SDB_INTF_LIST_LINK:
if (enumNode->EN_InterfaceIndex==INVALID_INTERFACE_INDEX) {
if (!IsListEmpty (&ServerTable.ST_IntfList.PL_Head)) {
PINTF_NODE intfNode = CONTAINING_RECORD (
ServerTable.ST_IntfList.PL_Head.Flink,
INTF_NODE,
IN_Link);
enumNode->EN_ListHead = &intfNode->IN_Head;
// Insert in the tail of the list -> we go backwards
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
break;
}
// No interface lists - fall through to error handling
}
else {
enumNode->EN_ListHead = FindIntfLink (InterfaceIndex);
if (enumNode->EN_ListHead!=NULL) {
// Insert in the tail of the list -> we go backwards
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
break;
}
// Interface list could not be found -
// fall through to error handling
}
GlobalFree (hEnum);
SetLastError (NO_ERROR);
hEnum = NULL;
break;
case SDB_TYPE_LIST_LINK:
if (enumNode->EN_Type==0xFFFF) {
if (!IsListEmpty (&ServerTable.ST_TypeList.PL_Head)) {
PTYPE_NODE typeNode = CONTAINING_RECORD (
ServerTable.ST_TypeList.PL_Head.Flink,
TYPE_NODE,
TN_Link);
enumNode->EN_ListHead = &typeNode->TN_Head;
// Insert in the tail of the list -> we go backwards
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
break;
}
// No type lists - fall through to error handling
}
else {
enumNode->EN_ListHead = FindTypeLink (Type);
if (enumNode->EN_ListHead!=NULL) {
// Insert in the tail of the list -> we go backwards
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
break;
}
// Type list could not be found -
// fall through to error handling
}
GlobalFree (hEnum);
SetLastError (NO_ERROR);
hEnum = NULL;
}
if (enumNode)
{
ReleaseServerTableList (enumNode->EN_ListLock);
}
#undef enumNode
return hEnum;
}
/*++
*******************************************************************
E n u m e r a t e S e r v e r s
Routine Description:
Calls callback routine consequtively for servers in the enumerated
list until told to stop by the callback or end of list is reached
Arguments:
Enumerator - handle obtained from CreateListEnumerator
CallBackProc - function to call for each server in the list
CBParam - extra parameter to pass to callback function
Return Value:
TRUE - if stopped by the callback
FALSE - if end of list is reached or operation failed (call GetLastError ()
to find out the reason of failure)
*******************************************************************
--*/
BOOLEAN
EnumerateServers (
IN HANDLE Enumerator,
IN EnumerateServersCallBack CallBackProc,
IN LPVOID CBParam
) {
#define enumNode ((PENUMERATOR_NODE)Enumerator)
BOOL res=FALSE, bNeedHashLock;
PSERVER_NODE node;
ULONG releaseTime;
// The following callbacks need to be invoked with hash table
// lock held because they modify/delete nodes
bNeedHashLock = (enumNode->EN_LinkIdx!=SDB_HASH_TABLE_LINK)
&& ((CallBackProc==DeleteAllServersCB)
|| (CallBackProc==DeleteNonLocalServersCB)
|| (CallBackProc==EnableAllServersCB)
|| (CallBackProc==DisableAllServersCB)
|| (CallBackProc==ConvertToStaticCB)
|| (CallBackProc==DeleteAllServersCB));
VALIDATE_ENUMERATOR_NODE(Enumerator);
if (!AcquireServerTableList (enumNode->EN_ListLock, TRUE)) {
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
releaseTime = GetTickCount ()+SDB_MAX_LOCK_HOLDING_TIME;
do { // Loop till told to stop by the callback
// Don't let client hold the list for too long
if (IsLater (GetTickCount (),releaseTime)) {
ReleaseServerTableList (enumNode->EN_ListLock);
#if DBG
Trace (DEBUG_SERVERDB,
"Held enumeration lock (%d list) for %ld extra msec",
enumNode->EN_LinkIdx, GetTickCount ()-releaseTime);
#endif
AcquireServerTableList (enumNode->EN_ListLock, TRUE);
releaseTime = GetTickCount ()+SDB_MAX_LOCK_HOLDING_TIME;
}
// Check if end of the list is reached
while (enumNode->N_Links[enumNode->EN_LinkIdx].Blink
==enumNode->EN_ListHead) {
// Check if we asked and can go to another list
switch (enumNode->EN_LinkIdx) {
case SDB_HASH_TABLE_LINK:
if ((enumNode->EN_Name[0]==0)
&&(enumNode->EN_ListHead
<&ServerTable.ST_HashLists[SDB_NAME_HASH_SIZE-1].HL_List.PL_Head)) {
RemoveEntryList (
&enumNode->N_Links[enumNode->EN_LinkIdx]);
ReleaseServerTableList (enumNode->EN_ListLock);
enumNode->EN_ListLock = &(CONTAINING_RECORD (
enumNode->EN_ListLock,
SDB_HASH_LIST,
HL_List)+1)->HL_List;
enumNode->EN_ListHead = &enumNode->EN_ListLock->PL_Head;
if (!AcquireServerTableList (enumNode->EN_ListLock, TRUE)) {
InitializeListEntry (
&enumNode->N_Links[enumNode->EN_LinkIdx]);
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
releaseTime = GetTickCount ()
+SDB_MAX_LOCK_HOLDING_TIME;
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
continue;
}
break;
case SDB_INTF_LIST_LINK:
if (enumNode->EN_InterfaceIndex
==INVALID_INTERFACE_INDEX) {
PINTF_NODE intfNode = CONTAINING_RECORD (
enumNode->EN_ListHead,
INTF_NODE,
IN_Head);
if (intfNode->IN_Link.Flink
!=&ServerTable.ST_IntfList.PL_Head) {
enumNode->EN_ListHead = &(CONTAINING_RECORD (
intfNode->IN_Link.Flink,
INTF_NODE,
IN_Link)->IN_Head);
RemoveEntryList (
&enumNode->N_Links[enumNode->EN_LinkIdx]);
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
continue;
}
}
break;
case SDB_TYPE_LIST_LINK:
if (enumNode->EN_Type == 0xFFFF) {
PTYPE_NODE typeNode = CONTAINING_RECORD (
enumNode->EN_ListHead,
TYPE_NODE,
TN_Head);
if (typeNode->TN_Link.Flink
!=&ServerTable.ST_TypeList.PL_Head) {
enumNode->EN_ListHead = &(CONTAINING_RECORD (
typeNode->TN_Link.Flink,
TYPE_NODE,
TN_Link)->TN_Head);
RemoveEntryList (
&enumNode->N_Links[enumNode->EN_LinkIdx]);
InsertTailList (enumNode->EN_ListHead,
&enumNode->N_Links[enumNode->EN_LinkIdx]);
continue;
}
}
break;
case SDB_CHANGE_QUEUE_LINK:
break;
default:
ASSERTMSG ("Unsupported list index ", FALSE);
}
// No more lists or not asked to check all of them
ReleaseServerTableList (enumNode->EN_ListLock);
SetLastError (NO_ERROR);
return FALSE;
}
node = CONTAINING_RECORD (enumNode->N_Links[enumNode->EN_LinkIdx].Blink,
SERVER_NODE,
N_Links[enumNode->EN_LinkIdx]);
VALIDATE_NODE(node);
RemoveEntryList (&enumNode->N_Links[enumNode->EN_LinkIdx]);
InsertTailList (&node->N_Links[enumNode->EN_LinkIdx],
&enumNode->N_Links[enumNode->EN_LinkIdx]);
if (!IsEnumerator(node)
&& ((enumNode->EN_Flags & SDB_DISABLED_NODE_FLAG) || !IsDisabledNode (node))
&& (!(enumNode->EN_Flags & SDB_MAIN_NODE_FLAG) || IsMainNode (node))
&& ((enumNode->EN_InterfaceIndex==INVALID_INTERFACE_INDEX)
|| (enumNode->EN_InterfaceIndex==node->SN_InterfaceIndex))
&& ((enumNode->EN_Type==0xFFFF)
|| (enumNode->EN_Type==node->SN_Type))
&& ((enumNode->EN_Protocol==0xFFFFFFFF)
|| (enumNode->EN_Protocol==node->SN_Protocol))
&& ((enumNode->EN_Name[0]==0)
|| (IpxNameCmp(enumNode->EN_Name, node->SN_Name)!=0))
) {
PSDB_HASH_LIST HashList;
if (bNeedHashLock) {
HashList = node->SN_HashList;
// Release the non-hash table lock to prevent deadlock
ReleaseServerTableList (enumNode->EN_ListLock);
if (!AcquireServerTableList (&HashList->HL_List, TRUE)) {
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
// Make sure the node was not deleted when we were
// acquiring hash lock
if (enumNode->N_Links[enumNode->EN_LinkIdx].Flink
!=&node->N_Links[enumNode->EN_LinkIdx]) {
// Node is gone, continue with the next one
ReleaseServerTableList (&HashList->HL_List);
if (AcquireServerTableList (enumNode->EN_ListLock, TRUE))
continue;
else {
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
}
}
// Check if we need to go through server list
if (!(enumNode->EN_Flags & SDB_MAIN_NODE_FLAG)
&& !IsListEmpty (&node->SN_ServerLink)
&& (enumNode->EN_LinkIdx!=SDB_INTF_LIST_LINK)
// Interface lists contain all entries anyway
) {
PLIST_ENTRY cur;
BOOL bMainNode;
cur = node->SN_ServerLink.Blink;
do {
PSERVER_NODE node1 = CONTAINING_RECORD (cur,
SERVER_NODE,
SN_ServerLink);
VALIDATE_SERVER_NODE(node1);
bMainNode = IsMainNode (node1); // It may be deleted in
// callback
cur = cur->Blink;
if (CallBackProc!=NULL) {
res = (*CallBackProc) (CBParam,
&node1->SN_Server,
node1->SN_InterfaceIndex,
node1->SN_Protocol,
node1->SN_AdvertisingNode,
node1->N_NodeFlags
);
}
}
while (res==FALSE && !bMainNode);
}
// Call them with just best entry
else if (CallBackProc!=NULL) {
res = (*CallBackProc) (CBParam,
&node->SN_Server,
node->SN_InterfaceIndex,
node->SN_Protocol,
node->SN_AdvertisingNode,
node->N_NodeFlags
);
}
if (res==-1) {
if (bNeedHashLock)
ReleaseServerTableList (&HashList->HL_List);
else
ReleaseServerTableList (enumNode->EN_ListLock);
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
else if (bNeedHashLock) {
ReleaseServerTableList (&HashList->HL_List);
if (!AcquireServerTableList (enumNode->EN_ListLock, TRUE)) {
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
}
}
// If enumerating through the change queue, this might be
// the last who needs to know about deleted server entry,
// so it will have to actually initiate deletion
if ((Enumerator==ServerTable.ST_LastEnumerator)
// make sure the node is still there
&& (enumNode->N_Links[SDB_CHANGE_QUEUE_LINK].Flink
== &node->N_Links[SDB_CHANGE_QUEUE_LINK])) {
if (IsEnumerator(node))
ServerTable.ST_LastEnumerator = (HANDLE)node;
else if (node->SN_HopCount==IPX_MAX_HOP_COUNT) {
ASSERTMSG ("Node being reset is not main ", IsMainNode (node));
ResetMainNode (node);
RemoveEntryList (&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
InitializeListEntry (&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
ASSERTMSG ("Deleted node in change queue has subnodes ",
!IsListEntry (&node->SN_ServerLink));
if (AcquireServerTableList (&ServerTable.ST_DeletedList, TRUE)) {
InsertTailList (&ServerTable.ST_DeletedList.PL_Head,
&node->SN_ServerLink);
ServerTable.ST_DeletedListCnt += 1;
if (ServerTable.ST_DeletedListCnt==SDBMaxUnsortedServers)
UpdateSortedList ();
ReleaseServerTableList (&ServerTable.ST_DeletedList);
}
// If we fail in locking we just let it hang around
// (at least we won't risk damaging the list)
}
}
}
while (!res);
ASSERT (res==TRUE);
ReleaseServerTableList (enumNode->EN_ListLock);
return TRUE;
#undef enumNode
}
/*++
*******************************************************************
G e t O n e C B
Routine Description:
Callback proc for EnumerateServers.
Copies the first entry with which it is called and stops enumeration
by returning TRUE
Arguments:
CBParam - pointer to buffer to which to copy service info
Server, InterfaceIndex, Protocol, AdvertisingNode - service data
Flags - ignored
Return Value:
TRUE
*******************************************************************
--*/
BOOL
GetOneCB (
IN LPVOID CBParam,
IN OUT PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN PUCHAR AdvertisingNode,
IN INT Flags
) {
#define Service ((PIPX_SERVICE)CBParam)
IpxServerCpy (&Service->Server, Server);
Service->InterfaceIndex = InterfaceIndex;
Service->Protocol = Protocol;
return TRUE;
#undef Service
}
/*++
*******************************************************************
D e l e t e A l l S e r v e r s C B
Routine Description:
Callback proc for EnumerateServers that deletes all server
entries with which it is called
Arguments:
CBParam - enumeration handle that identifies enumeration
Server - pointer to server data inside server node from which node
itself is computed
Return Value:
FALSE - deletion succeded, continue
TRUE - failure to lock SDB list, stop enumeration and return FALSE
to client (error code is set in this routine)
*******************************************************************
--*/
BOOL
DeleteAllServersCB (
IN LPVOID CBParam,
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN PUCHAR AdvertisingNode,
IN INT Flags
) {
PSERVER_NODE node = CONTAINING_RECORD (Server, SERVER_NODE, SN_Server);
if (AcquireAllLocks ()) {
node->SN_HopCount = IPX_MAX_HOP_COUNT;
if (IsMainNode (node)) {
if (IsListEmpty (&node->SN_ServerLink))
DeleteMainNode (node);
else
ChangeMainNode (
node,
CONTAINING_RECORD (
node->SN_ServerLink.Flink,
SERVER_NODE,
SN_ServerLink),
NULL);
}
else
DeleteNode (node);
ReleaseAllLocks ();
return FALSE;
}
else {
return -1;
}
}
BOOL
DeleteNonLocalServersCB (
IN LPVOID CBParam,
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN PUCHAR AdvertisingNode,
IN INT Flags
) {
if (InterfaceIndex!=INTERNAL_INTERFACE_INDEX)
return DeleteAllServersCB (CBParam, Server, InterfaceIndex, Protocol,
AdvertisingNode, Flags);
else
return FALSE;
}
/*++
*******************************************************************
E n a b l e A l l S e r v e r s C B
Routine Description:
Callback proc for EnumerateServers that reenables all server
entries with which it is called
Arguments:
CBParam - enumeration handle that identifies enumeration
Server - pointer to server data inside server node from which node
itself is computed
Return Value:
FALSE - deletion succeded, continue
TRUE - failure to lock SDB list, stop enumeration and return FALSE
to client (error code is set in this routine)
*******************************************************************
--*/
BOOL
EnableAllServersCB (
IN LPVOID CBParam,
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN PUCHAR AdvertisingNode,
IN INT Flags
) {
PSERVER_NODE node = CONTAINING_RECORD (Server, SERVER_NODE, SN_Server);
if (AcquireAllLocks ()) {
if (IsDisabledNode (node)) {
ResetDisabledNode (node);
if (!IsMainNode (node)) {
PSERVER_NODE node1 = node;
do {
node1 = CONTAINING_RECORD (
node1->SN_ServerLink.Blink,
SERVER_NODE,
SN_ServerLink);
}
while (!IsMainNode (node1)
&& (IsDisabledNode(node1)
|| (node1->SN_HopCount>node->SN_HopCount)));
if (IsMainNode (node1) && (node1->SN_HopCount>node->SN_HopCount))
ChangeMainNode (node1, node, NULL);
else {
RemoveEntryList (&node->SN_ServerLink);
InsertHeadList (&node1->SN_ServerLink, &node->SN_ServerLink);
}
}
}
ReleaseAllLocks ();
return FALSE;
}
else {
return -1;
}
}
/*++
*******************************************************************
D i s a b l e A l l S e r v e r s C B
Routine Description:
Callback proc for EnumerateServers that disables all server
entries with which it is called
Arguments:
CBParam - enumeration handle that identifies enumeration
Server - pointer to server data inside server node from which node
itself is computed
Return Value:
FALSE - deletion succeded, continue
TRUE - failure to lock SDB list, stop enumeration and return FALSE
to client (error code is set in this routine)
*******************************************************************
--*/
BOOL
DisableAllServersCB (
IN LPVOID CBParam,
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN PUCHAR AdvertisingNode,
IN INT Flags
) {
PSERVER_NODE node = CONTAINING_RECORD (Server, SERVER_NODE, SN_Server);
if (AcquireAllLocks ()) {
if (!IsDisabledNode (node)) {
SetDisabledNode (node);
if (IsMainNode (node)) {
if (!IsListEmpty (&node->SN_ServerLink)) {
ChangeMainNode (
node,
CONTAINING_RECORD (
node->SN_ServerLink.Flink,
SERVER_NODE,
SN_ServerLink),
NULL);
}
}
else {
PSERVER_NODE node1 = node;
do {
node1 = CONTAINING_RECORD (
node1->SN_ServerLink.Blink,
SERVER_NODE,
SN_ServerLink);
}
while (!IsMainNode (node1)
&& !IsDisabledNode(node1));
RemoveEntryList (&node->SN_ServerLink);
InsertTailList (&node1->SN_ServerLink, &node->SN_ServerLink);
}
}
ReleaseAllLocks ();
}
else {
return -1;
}
return NO_ERROR;
}
/*++
*******************************************************************
C o n v e r t T o S t a t i c C B
Routine Description:
Callback proc for EnumerateServers that converts all server
entries with which it is called to static (changes protocol field to
static)
Arguments:
CBParam - enumeration handle that identifies enumeration
Server - pointer to server data inside server node from which node
itself is computed
Return Value:
FALSE
*******************************************************************
--*/
BOOL
ConvertToStaticCB (
IN LPVOID CBParam,
IN PIPX_SERVER_ENTRY_P Server,
IN ULONG InterfaceIndex,
IN ULONG Protocol,
IN PUCHAR AdvertisingNode,
IN INT Flags
) {
#define enumNode ((PENUMERATOR_NODE)CBParam)
PSERVER_NODE node = CONTAINING_RECORD (Server, SERVER_NODE, SN_Server);
node->SN_Protocol = IPX_PROTOCOL_STATIC;
IpxNodeCpy (node->SN_AdvertisingNode, IPX_BCAST_NODE);
#undef enumNode
return FALSE;
}
/*++
*******************************************************************
D e l e t e L i s t E n u m e r a t o r
Routine Description:
Releases resources associated with list enumerator (this includes
server entries that are queued to change queue before being deleted)
Arguments:
Enumerator - handle obtained from CreateListEnumerator
Return Value:
None
*******************************************************************
--*/
void
DeleteListEnumerator (
IN HANDLE Enumerator
) {
#define enumNode ((PENUMERATOR_NODE)Enumerator)
if (!AcquireServerTableList (enumNode->EN_ListLock, TRUE))
return;
VALIDATE_ENUMERATOR_NODE(Enumerator);
if (Enumerator==ServerTable.ST_LastEnumerator) {
// Release all servers marked for deletion
PLIST_ENTRY cur = enumNode->N_Links[enumNode->EN_LinkIdx].Blink;
// Reset to note that there are no enumerators and
// nodes have to be deleted rigth away.
ServerTable.ST_LastEnumerator = NULL;
while (cur!=enumNode->EN_ListHead) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[enumNode->EN_LinkIdx]);
VALIDATE_NODE(node);
cur = cur->Blink;
if (IsEnumerator (node)) {
ServerTable.ST_LastEnumerator = (HANDLE)node;
break;
}
else if (node->SN_HopCount==IPX_MAX_HOP_COUNT) {
ASSERTMSG ("Node being reset is not main ", IsMainNode (node));
ResetMainNode (node);
RemoveEntryList (&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
InitializeListEntry (&node->N_Links[SDB_CHANGE_QUEUE_LINK]);
ASSERTMSG ("Deleted node in change queue has subnodes ",
!IsListEntry (&node->SN_ServerLink));
if (AcquireServerTableList (&ServerTable.ST_DeletedList, TRUE)) {
InsertTailList (&ServerTable.ST_DeletedList.PL_Head,
&node->SN_ServerLink);
ServerTable.ST_DeletedListCnt += 1;
if (ServerTable.ST_DeletedListCnt==SDBMaxUnsortedServers)
UpdateSortedList ();
ReleaseServerTableList (&ServerTable.ST_DeletedList);
}
// If we fail in locking we just let it hang around
// (at least we won't risk damaging the list)
}
}
}
RemoveEntryList (&enumNode->N_Links[enumNode->EN_LinkIdx]);
if ((enumNode->EN_LinkIdx==SDB_INTF_LIST_LINK)
&& IsListEmpty (enumNode->EN_ListHead)) {
PINTF_NODE intfNode = CONTAINING_RECORD (
enumNode->EN_ListHead,
INTF_NODE,
IN_Head);
RemoveEntryList (&intfNode->IN_Link);
GlobalFree (intfNode);
}
ReleaseServerTableList (enumNode->EN_ListLock);
GlobalFree (Enumerator);
#undef enumNode
}
/*++
*******************************************************************
G e t F i r s t S e r v e r
Routine Description:
Find and return first service in the order specified by the ordering method.
Search is limited only to certain types of services as specified by the
exclusion flags end corresponding fields in Server parameter.
Returns ERROR_NO_MORE_ITEMS if there are no services in the
table that meet specified criteria.
Arguments:
OrderingMethod - which ordering to consider in determining what is
the first server
ExclusionFlags - flags to limit search to certain servers according
to specified criteria
Server - On input: criteria for exclusion flags
On output: first service entry in the specified order
Return Value:
NO_ERROR - server was found that meets specified criteria
ERROR_NO_MORE_ITEMS - no server exist with specified criteria
other - operation failed (windows error code)
*******************************************************************
--*/
DWORD
GetFirstServer (
IN DWORD OrderingMethod,
IN DWORD ExclusionFlags,
IN OUT PIPX_SERVER_ENTRY_P Server,
IN OUT ULONG *InterfaceIndex,
IN OUT ULONG *Protocol
) {
DWORD status=NO_ERROR;
PSDB_HASH_LIST HashList;
PPROTECTED_LIST list;
INT link;
PLIST_ENTRY cur;
switch (OrderingMethod) {
case STM_ORDER_BY_TYPE_AND_NAME:
break;
case STM_ORDER_BY_INTERFACE_TYPE_NAME:
if (!(ExclusionFlags & STM_ONLY_THIS_INTERFACE)) {
if (!AcquireServerTableList (&ServerTable.ST_IntfList, TRUE))
return ERROR_GEN_FAILURE;
if (IsListEmpty (&ServerTable.ST_IntfList.PL_Head)) {
ReleaseServerTableList (&ServerTable.ST_IntfList);
return ERROR_NO_MORE_ITEMS;
}
*InterfaceIndex = CONTAINING_RECORD (
ServerTable.ST_IntfList.PL_Head.Flink,
INTF_NODE,
IN_Link)->IN_InterfaceIndex;
ReleaseServerTableList (&ServerTable.ST_IntfList);
}
break;
default:
ASSERTMSG ("Invalid ordering method specified ", FALSE);
return ERROR_INVALID_PARAMETER;
}
if (ExclusionFlags & STM_ONLY_THIS_NAME) {
HashList = &ServerTable.ST_HashLists[HashFunction (Server->Name)];
if (!AcquireServerTableList (&HashList->HL_List, TRUE))
return ERROR_GEN_FAILURE;
list = &HashList->HL_List;
link = SDB_HASH_TABLE_LINK;
}
else {
if (ServerTable.ST_UpdatePending==-1)
DoUpdateSortedList ();
if (!AcquireServerTableList (&ServerTable.ST_SortedListPRM, TRUE))
return ERROR_GEN_FAILURE;
list = &ServerTable.ST_SortedListPRM;
link = SDB_SORTED_LIST_LINK;
}
cur = list->PL_Head.Flink;
while (TRUE) {
// We may need to loop through interface lists
status = DoFindNextNode (cur,
list,
link,
OrderingMethod==STM_ORDER_BY_INTERFACE_TYPE_NAME
? ExclusionFlags|STM_ONLY_THIS_INTERFACE
: ExclusionFlags,
Server,
InterfaceIndex,
Protocol,
NULL
);
// If looping through all interfaces in interface order and
// no items are available, we may need to check another interface
if ((status==ERROR_NO_MORE_ITEMS)
&& (OrderingMethod==STM_ORDER_BY_INTERFACE_TYPE_NAME)
&& !(ExclusionFlags&STM_ONLY_THIS_INTERFACE)) {
if (!AcquireServerTableList (&ServerTable.ST_IntfList, TRUE)) {
status = ERROR_GEN_FAILURE;
break;
}
// Get next interface in interface list
cur = ServerTable.ST_IntfList.PL_Head.Flink;
while (cur!=&ServerTable.ST_IntfList.PL_Head) {
PINTF_NODE intfNode = CONTAINING_RECORD (cur,
INTF_NODE,
IN_Link);
if (*InterfaceIndex<intfNode->IN_InterfaceIndex) {
*InterfaceIndex = intfNode->IN_InterfaceIndex;
break;
}
cur = cur->Flink;
}
ReleaseServerTableList (&ServerTable.ST_IntfList);
if (cur!=&ServerTable.ST_IntfList.PL_Head) {
// Restart the search with another interface index
cur = list->PL_Head.Flink;
continue;
}
}
break;
}
if (link==SDB_HASH_TABLE_LINK)
ReleaseServerTableList (&HashList->HL_List);
else /* if (link==SDB_SORTED_LIST_LINK) */
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
return status;
}
/*++
*******************************************************************
G e t N e x t S e r v e r
Routine Description:
Find and return next service in the order specified by the ordering method.
Search starts from specified service and is limited only to certain types
of services as specified by the exclusion flags and corresponding fields
in Server parameter.
Arguments:
OrderingMethod - which ordering to consider in determining what is
the first server
ExclusionFlags - flags to limit search to certain servers according
to fields of Server
Server - On input server entry from which to compute the next
On output: first service entry in the specified order
Return Value:
NO_ERROR - server was found that meets specified criteria
ERROR_NO_MORE_ITEMS - no server exist with specified criteria
other - operation failed (windows error code)
*******************************************************************
--*/
DWORD
GetNextServer (
IN DWORD OrderingMethod,
IN DWORD ExclusionFlags,
IN OUT PIPX_SERVER_ENTRY_P Server,
IN OUT ULONG *InterfaceIndex,
IN OUT ULONG *Protocol
) {
PLIST_ENTRY cur=NULL;
PSERVER_NODE theNode=NULL;
DWORD status=NO_ERROR;
PSDB_HASH_LIST HashList;
PPROTECTED_LIST list;
INT link;
INT res;
switch (OrderingMethod) {
case STM_ORDER_BY_TYPE_AND_NAME:
break;
case STM_ORDER_BY_INTERFACE_TYPE_NAME:
break;
default:
ASSERTMSG ("Invalid ordering method specified ", FALSE);
return ERROR_INVALID_PARAMETER;
}
if (!AcquireServerTableList (&ServerTable.ST_SortedListPRM, TRUE))
return ERROR_GEN_FAILURE;
if (Server->Name[0]!=0) {
HashList = &ServerTable.ST_HashLists[HashFunction (Server->Name)];
if (!AcquireServerTableList (&HashList->HL_List, TRUE)) {
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
return ERROR_GEN_FAILURE;
}
cur = HashList->HL_List.PL_Head.Flink;
while (cur!=&HashList->HL_List.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_HASH_TABLE_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator(node)
&& (!IsDisabledNode (node)
|| ((ExclusionFlags & STM_ONLY_THIS_PROTOCOL)
&& (*Protocol==IPX_PROTOCOL_STATIC)))
&& (node->SN_Server.HopCount<IPX_MAX_HOP_COUNT)) {
if (Server->Type == node->SN_Server.Type) {
res = IpxNameCmp (Server->Name, node->SN_Server.Name);
if ((res==0) && IsSortedNode (node)) {
theNode = node;
}
else if (res<0)
break;
}
else if (Server->Type<node->SN_Server.Type)
break;
}
cur = cur->Flink;
}
if (ExclusionFlags&STM_ONLY_THIS_NAME) {
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
if (theNode!=NULL) {
list = &HashList->HL_List;
link = SDB_HASH_TABLE_LINK;
}
else {
ReleaseServerTableList (&HashList->HL_List);
return ERROR_NO_MORE_ITEMS;
}
}
else {
ReleaseServerTableList (&HashList->HL_List);
goto DoHardWay;
}
}
else {
DoHardWay:
list = &ServerTable.ST_SortedListPRM;
link = SDB_SORTED_LIST_LINK;
if (theNode!=NULL)
cur = theNode->N_Links[SDB_SORTED_LIST_LINK].Flink;
else {
cur = ServerTable.ST_SortedListPRM.PL_Head.Flink;
while (cur!=&ServerTable.ST_SortedListPRM.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_SORTED_LIST_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator(node)
&& (!IsDisabledNode (node)
|| ((ExclusionFlags & STM_ONLY_THIS_PROTOCOL)
&& (*Protocol==IPX_PROTOCOL_STATIC)))
&& (node->SN_Server.HopCount<IPX_MAX_HOP_COUNT)) {
if ((Server->Type<node->SN_Server.Type)
|| ((Server->Type == node->SN_Server.Type)
&& (IpxNameCmp (Server->Name,
node->SN_Server.Name)<0)))
break;
}
cur = cur->Flink;
}
}
}
while (TRUE) {
// We may need to loop through interface lists
status = DoFindNextNode (cur,
list,
link,
OrderingMethod==STM_ORDER_BY_INTERFACE_TYPE_NAME
? ExclusionFlags|STM_ONLY_THIS_INTERFACE
: ExclusionFlags,
Server,
InterfaceIndex,
Protocol,
NULL
);
// If looping through all interfaces in interface order and
// no items are available, we may need to check another interface
if ((status==ERROR_NO_MORE_ITEMS)
&& (OrderingMethod==STM_ORDER_BY_INTERFACE_TYPE_NAME)
&& !(ExclusionFlags&STM_ONLY_THIS_INTERFACE)) {
if (!AcquireServerTableList (&ServerTable.ST_IntfList, TRUE)) {
status = ERROR_GEN_FAILURE;
break;
}
// Get next interface in interface list
cur = ServerTable.ST_IntfList.PL_Head.Flink;
while (cur!=&ServerTable.ST_IntfList.PL_Head) {
PINTF_NODE intfNode = CONTAINING_RECORD (cur,
INTF_NODE,
IN_Link);
if (*InterfaceIndex<intfNode->IN_InterfaceIndex) {
*InterfaceIndex = intfNode->IN_InterfaceIndex;
break;
}
cur = cur->Flink;
}
ReleaseServerTableList (&ServerTable.ST_IntfList);
if (cur!=&ServerTable.ST_IntfList.PL_Head) {
// Restart the search with another interface index
cur = list->PL_Head.Flink;
continue;
}
}
break;
}
if (link==SDB_HASH_TABLE_LINK)
ReleaseServerTableList (&HashList->HL_List);
else /* if (link==SDB_SORTED_LIST_LINK) */
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
return status;
}
/*++
*******************************************************************
G e t N e x t S e r v e r F r o m I D
Routine Description:
Find and return service that follows server with specified ID
in the type.name order.
Arguments:
ObjectID - on input: id of server form which to start the search
on output: id of returned server
Type - if not 0xFFFF, search should be limited to only servers
of specified type
Server, Protocol, InterfaceIndex - buffer to put returned server info in
Return Value:
TRUE - server was found
FALSE - search failed
*******************************************************************
--*/
BOOL
GetNextServerFromID (
IN OUT PULONG ObjectID,
IN USHORT Type,
OUT PIPX_SERVER_ENTRY_P Server,
OUT PULONG InterfaceIndex OPTIONAL,
OUT PULONG Protocol OPTIONAL
) {
PSDB_HASH_LIST HashList;
PLIST_ENTRY cur;
PSERVER_NODE theNode = NULL;
DWORD status=NO_ERROR;
HashList = &ServerTable.ST_HashLists[(*ObjectID)%SDB_NAME_HASH_SIZE];
if (*ObjectID==SDB_INVALID_OBJECT_ID) {
if (ServerTable.ST_UpdatePending==-1)
DoUpdateSortedList ();
}
if (!AcquireServerTableList (&ServerTable.ST_SortedListPRM, TRUE))
return ERROR_GEN_FAILURE;
if (*ObjectID!=SDB_INVALID_OBJECT_ID) {
if (!AcquireServerTableList (&HashList->HL_List, TRUE)) {
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
SetLastError (ERROR_GEN_FAILURE);
return FALSE;
}
cur = HashList->HL_List.PL_Head.Flink;
while (cur!=&HashList->HL_List.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_HASH_TABLE_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator (node) && !IsDisabledNode (node)
&& (node->SN_HopCount < IPX_MAX_HOP_COUNT)
&& (node->SN_ObjectID == *ObjectID)) {
theNode = node;
break;
}
cur = cur->Flink;
}
ReleaseServerTableList (&HashList->HL_List);
if (theNode==NULL) {
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
SetLastError (NO_ERROR);
return FALSE;
}
else if (!IsSortedNode (theNode)) {
cur = ServerTable.ST_SortedListPRM.PL_Head.Flink;
while (cur!=&ServerTable.ST_SortedListPRM.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_SORTED_LIST_LINK]);
VALIDATE_NODE(node);
if (!IsEnumerator(node) && !IsDisabledNode (node)) {
if ((theNode->SN_Server.Type<node->SN_Server.Type)
|| ((theNode->SN_Server.Type == node->SN_Server.Type)
&& (IpxNameCmp (theNode->SN_Server.Name,
node->SN_Server.Name)<0)))
break;
}
cur = cur->Flink;
}
}
else
cur = theNode->N_Links[SDB_SORTED_LIST_LINK].Flink;
}
else
cur = ServerTable.ST_SortedListPRM.PL_Head.Flink;
Server->Type = Type;
status = DoFindNextNode (cur,
&ServerTable.ST_SortedListPRM,
SDB_SORTED_LIST_LINK,
Type==0xFFFF ? 0 : STM_ONLY_THIS_TYPE,
Server,
InterfaceIndex,
Protocol,
ObjectID
);
ReleaseServerTableList (&ServerTable.ST_SortedListPRM);
return status == NO_ERROR;
}
/*++
*******************************************************************
D o F i n d N e x t N o d e
Routine Description:
Scan through SortedListPRM to find the first entry that matches specified
cirteria. Permanent sorted list must be locked before calling
this routine
Arguments:
cur - pointer to entry in SortedListPRM from which to start the search
ExclusionFlags - flags to limit search to certain servers according
to fields of Server
Server, InterfaceIndex, Protocol - on input: search criteria
on output: data of found server
ObjectID - object ID of returned server
Return Value:
NO_ERROR - server was found that matches the criteria
ERROR_NO_MORE_ITEMS - no server exist that matches criteria
other - operation failed (windows error code)
*******************************************************************
--*/
DWORD
DoFindNextNode (
IN PLIST_ENTRY cur,
IN PPROTECTED_LIST list,
IN INT link,
IN DWORD ExclusionFlags,
IN OUT PIPX_SERVER_ENTRY_P Server,
IN OUT PULONG InterfaceIndex OPTIONAL,
IN OUT PULONG Protocol OPTIONAL,
OUT PULONG ObjectID OPTIONAL
) {
while (cur!=&list->PL_Head) {
PSDB_HASH_LIST HashList;
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[link]);
VALIDATE_NODE(node);
if (!IsEnumerator(node)
&& (!IsDisabledNode (node)
|| ((ExclusionFlags & STM_ONLY_THIS_PROTOCOL)
&& (*Protocol==IPX_PROTOCOL_STATIC)))
&& (node->SN_Server.HopCount<IPX_MAX_HOP_COUNT)) {
if (ExclusionFlags & STM_ONLY_THIS_TYPE) {
if (Server->Type>node->SN_Type)
goto DoNextNode;
else if (Server->Type<node->SN_Type)
break;
}
if (ExclusionFlags & STM_ONLY_THIS_NAME) {
INT res = IpxNameCmp (Server->Name,node->SN_Name);
if (res>0)
goto DoNextNode;
else if (res<0) {
if (ExclusionFlags & STM_ONLY_THIS_TYPE)
break;
else
goto DoNextNode;
}
}
HashList = node->SN_HashList;
if (list!=&HashList->HL_List) {
if (!AcquireServerTableList (&HashList->HL_List, TRUE))
return ERROR_GEN_FAILURE;
}
do {
if ((ExclusionFlags &
STM_ONLY_THIS_PROTOCOL|STM_ONLY_THIS_INTERFACE)
== (STM_ONLY_THIS_PROTOCOL|STM_ONLY_THIS_INTERFACE)) {
if ((*Protocol==node->SN_Protocol)
&& (*InterfaceIndex==node->SN_InterfaceIndex))
break;
}
else if (ExclusionFlags & STM_ONLY_THIS_PROTOCOL) {
if (*Protocol==node->SN_Protocol)
break;
}
else if (ExclusionFlags & STM_ONLY_THIS_INTERFACE) {
if (*InterfaceIndex!=node->SN_InterfaceIndex)
break;
}
else
break;
node = CONTAINING_RECORD (node->SN_ServerLink.Flink,
SERVER_NODE, SN_ServerLink);
VALIDATE_SERVER_NODE(node);
if (cur==&node->N_Links[link]) {
if (list!=&HashList->HL_List)
ReleaseServerTableList (&HashList->HL_List);
goto DoNextNode;
}
}
while (1);
IpxServerCpy (Server, &node->SN_Server);
if (ARGUMENT_PRESENT (ObjectID)) {
if (node->SN_ObjectID==SDB_INVALID_OBJECT_ID)
node->SN_ObjectID = GenerateUniqueID (node->SN_HashList);
*ObjectID = node->SN_ObjectID;
}
if (ARGUMENT_PRESENT (InterfaceIndex))
*InterfaceIndex = node->SN_InterfaceIndex;
if (ARGUMENT_PRESENT (Protocol))
*Protocol = node->SN_Protocol;
if (list!=&HashList->HL_List)
ReleaseServerTableList (&HashList->HL_List);
return NO_ERROR;
}
DoNextNode:
cur = cur->Flink;
}
return ERROR_NO_MORE_ITEMS;
}
/*++
*******************************************************************
F i n d I n t f L i n k
Routine Description:
Find interface list given an interface index. Create new interface
list if one for given index does not exist
Interface list must be locked when calling this routine
Arguments:
InterfaceIndex - index to look for
Return Value:
Head of interface list (link at which new entry can be inserted)
NULL if list could not be found and creation of new list failed
*******************************************************************
--*/
PLIST_ENTRY
FindIntfLink (
ULONG InterfaceIndex
) {
PLIST_ENTRY cur;
PINTF_NODE node;
cur = ServerTable.ST_IntfList.PL_Head.Flink;
while (cur!=&ServerTable.ST_IntfList.PL_Head) {
node = CONTAINING_RECORD (cur, INTF_NODE, IN_Link);
if (InterfaceIndex==node->IN_InterfaceIndex)
return &node->IN_Head;
else if (InterfaceIndex<node->IN_InterfaceIndex)
break;
cur = cur->Flink;
}
node = (PINTF_NODE)GlobalAlloc (GMEM_FIXED, sizeof (INTF_NODE));
if (node==NULL) {
Trace (DEBUG_FAILURES,
"File: %s, line: %ld. Can't allocate interface list node (gle:%ld).",
__FILE__, __LINE__, GetLastError ());
SetLastError (ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
node->IN_InterfaceIndex = InterfaceIndex;
InitializeListHead (&node->IN_Head);
InsertTailList (cur, &node->IN_Link);
return &node->IN_Head;
}
/*++
*******************************************************************
F i n d T y p e L i n k
Routine Description:
Find type list given a type value. Create new type
list if one for given type does not exist
Type list must be locked when calling this routine
Arguments:
Type - type to look for
Return Value:
Head of type list (link at which new entry can be inserted)
NULL if list could not be found and creation of new list failed
*******************************************************************
--*/
PLIST_ENTRY
FindTypeLink (
USHORT Type
) {
PLIST_ENTRY cur;
PTYPE_NODE node;
cur = ServerTable.ST_TypeList.PL_Head.Flink;
while (cur!=&ServerTable.ST_TypeList.PL_Head) {
node = CONTAINING_RECORD (cur, TYPE_NODE, TN_Link);
if (Type==node->TN_Type)
return &node->TN_Head;
else if (Type<node->TN_Type)
break;
cur = cur->Flink;
}
node = (PTYPE_NODE)GlobalAlloc (GMEM_FIXED, sizeof (TYPE_NODE));
if (node==NULL) {
Trace (DEBUG_FAILURES,
"File: %s, line: %ld. Can't allocate type list node (gle:%ld).",
__FILE__, __LINE__, GetLastError ());
SetLastError (ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
node->TN_Type = Type;
InitializeListHead (&node->TN_Head);
InsertTailList (cur, &node->TN_Link);
return &node->TN_Head;
}
/*++
*******************************************************************
F i n d S o r t e d L i n k
Routine Description:
Find place for server with given type and name in SortedListTMP
If there is another node there with the same name and type it
is removed from the list
SortedListTMP must be locked when calling this routine
Arguments:
Type - type to look for
Name - name to look for
Return Value:
Link in SortedListTMP at which server with given name and type
should be inserted
This routine can't fail
*******************************************************************
--*/
PLIST_ENTRY
FindSortedLink (
USHORT Type,
PUCHAR Name
) {
PLIST_ENTRY cur;
INT res;
cur = ServerTable.ST_SortedListTMP.PL_Head.Flink;
while (cur!=&ServerTable.ST_SortedListTMP.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_SORTED_LIST_LINK]);
VALIDATE_SERVER_NODE(node);
if (Type==node->SN_Type) {
res = IpxNameCmp (Name, node->SN_Name);
if (res==0) {
cur = cur->Flink;
RemoveEntryList (&node->N_Links[SDB_SORTED_LIST_LINK]);
InitializeListEntry (&node->N_Links[SDB_SORTED_LIST_LINK]);
ServerTable.ST_TMPListCnt -= 1;
break;
}
else if (res<0)
break;
}
else if (Type<node->SN_Type)
break;
cur = cur->Flink;
}
return cur;
}
/*++
*******************************************************************
H a s h F u n c t i o n
Routine Description:
Computes hash function for given server name. In addition it normalizes
length and capitalization of name
Arguments:
Name - name to process
Return Value:
Hash value
*******************************************************************
--*/
INT
HashFunction (
PUCHAR Name
) {
INT i;
INT res = 0;
for (i=0; i<47; i++) {
Name[i] = (UCHAR)toupper(Name[i]);
if (Name[i]==0)
break;
else
res += Name[i];
}
if ((i==47) && (Name[i]!=0)) {
Trace (DEBUG_SERVERDB, "Correcting server name: %.48s.", Name);
Name[i] = 0;
}
return res % SDB_NAME_HASH_SIZE;
}
/*++
*******************************************************************
G e n e r a t e U n i q u e I D
Routine Description:
Generates "unique" ULONG for server by combining hash bucket number and
unique ID of entry in hash list.
The number is kept with entry until there is a danger of collision
due to number wraparound
Arguments:
HashList - hash bucket to generate ID for
Return Value:
ULONG ID
*******************************************************************
--*/
ULONG
GenerateUniqueID (
PSDB_HASH_LIST HashList
) {
ULONG id = HashList->HL_ObjectID;
HashList->HL_ObjectID = (HashList->HL_ObjectID+SDB_NAME_HASH_SIZE)&SDB_OBJECT_ID_MASK;
// Make sure we won't assign invalid id
if (HashList->HL_ObjectID==SDB_INVALID_OBJECT_ID)
HashList->HL_ObjectID+=SDB_NAME_HASH_SIZE;
// Create guard zone by invalidating all ID's that are one zone
// above the zone we just entered
if (!IsSameObjectIDZone(id, HashList->HL_ObjectID)) {
PLIST_ENTRY cur = HashList->HL_List.PL_Head.Flink;
ULONG oldMask = (HashList->HL_ObjectID & SDB_OBJECT_ID_ZONE_MASK)
+ SDB_OBJECT_ID_ZONE_UNIT;
while (cur!=&HashList->HL_List.PL_Head) {
PSERVER_NODE node = CONTAINING_RECORD (cur,
SERVER_NODE,
N_Links[SDB_HASH_TABLE_LINK]);
if (!IsEnumerator(node)) {
if ((node->SN_ObjectID & SDB_OBJECT_ID_ZONE_MASK)==oldMask)
node->SN_ObjectID = SDB_INVALID_OBJECT_ID;
}
}
cur = cur->Flink;
}
return id;
}
Reference in a new issue Copy permalink