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/*++
Copyright (c) 1992-1996 Microsoft Corporation
Module Name:
srvr_lm.c
Abstract:
This file contains the routines which actually call Lan Manager and retrieve the contents of the domain server table, including cacheing.
Environment:
User Mode - Win32
Revision History:
10-May-1996 DonRyan Removed banner from Technology Dynamics, Inc.
--*/
//--------------------------- WINDOWS DEPENDENCIES --------------------------
//--------------------------- STANDARD DEPENDENCIES -- #include<xxxxx.h> ----
#ifdef WIN32
#include <windows.h>
#include <lm.h>
#endif
#include <tchar.h>
#include <string.h>
#include <search.h>
#include <stdlib.h>
#include <time.h>
//--------------------------- MODULE DEPENDENCIES -- #include"xxxxx.h" ------
#include "mib.h"
#include "mibfuncs.h"
#include "srvr_tbl.h"
#include "lmcache.h"
//--------------------------- SELF-DEPENDENCY -- ONE #include"module.h" -----
//--------------------------- PUBLIC VARIABLES --(same as in module.h file)--
//--------------------------- PRIVATE CONSTANTS -----------------------------
#define SafeBufferFree(x) if(NULL != x) NetApiBufferFree( x )
#define SafeFree(x) if(NULL != x) SnmpUtilMemFree( x )
//--------------------------- PRIVATE STRUCTS -------------------------------
//--------------------------- PRIVATE VARIABLES -----------------------------
//--------------------------- PRIVATE PROTOTYPES ----------------------------
//--------------------------- PRIVATE PROCEDURES ----------------------------
int __cdecl srvr_entry_cmp( IN const DOM_SERVER_ENTRY *A, IN const DOM_SERVER_ENTRY *B ) ;
BOOL build_srvr_entry_oids( );
void FreeDomServerTable();
//--------------------------- PUBLIC PROCEDURES -----------------------------
//
// MIB_srvr_lmget
// Retrieve domain server table information from Lan Manager.
// If not cached, sort it and then
// cache it.
//
// Notes:
//
// Return Codes:
// SNMPAPI_NOERROR
// SNMPAPI_ERROR
//
// Error Codes:
// None.
//
SNMPAPI MIB_svsond_lmget(){ DWORD entriesread = 0; DWORD totalentries = 0; LPBYTE bufptr = NULL; unsigned lmCode; unsigned i; SERVER_INFO_100 *DataTable; DOM_SERVER_ENTRY *MIB_DomServerTableElement ; int First_of_this_block; time_t curr_time ; SNMPAPI nResult = SNMPAPI_NOERROR; DWORD resumehandle=0; DWORD dwAllocatedEntries=0;
time(&curr_time); // get the time
//
//
// If cached, return piece of info.
//
//
if((NULL != cache_table[C_SRVR_TABLE].bufptr) && (curr_time < (cache_table[C_SRVR_TABLE].acquisition_time + cache_expire[C_SRVR_TABLE])) ) { // it has NOT expired!
goto Exit ; // the global table is valid
}
// free the old table LOOK OUT!!
FreeDomServerTable();
First_of_this_block = 0; do { // as long as there is more data to process
//
//
// Do network call to gather information and put it in a nice array
//
//
lmCode = NetServerEnum( NULL, // local server NT_PROBLEM
100, // level 100
&bufptr, // data structure to return
MAX_PREFERRED_LENGTH, &entriesread, &totalentries, SV_TYPE_SERVER, NULL, &resumehandle // resume handle
);
DataTable = (SERVER_INFO_100 *) bufptr ;
if((NERR_Success == lmCode) || (ERROR_MORE_DATA == lmCode)) { // valid so process it, otherwise error
if(0 == MIB_DomServerTable.Len) { // 1st time, alloc the whole table
// alloc the table space
MIB_DomServerTable.Table = SnmpUtilMemAlloc(totalentries * sizeof(DOM_SERVER_ENTRY) ); if (MIB_DomServerTable.Table == NULL) { // free all of the lan man data
SafeBufferFree( bufptr ) ; // Signal error
nResult = SNMPAPI_ERROR; goto Exit; } dwAllocatedEntries = totalentries; }
MIB_DomServerTableElement = MIB_DomServerTable.Table + First_of_this_block ;
for(i=0; (i<entriesread) && ((i+First_of_this_block) < dwAllocatedEntries); i++) { // once for each entry in the buffer
// increment the entry number
MIB_DomServerTable.Len ++;
// Stuff the data into each item in the table
MIB_DomServerTableElement->domServerName.dynamic = TRUE;#ifdef UNICODE
if (SnmpUtilUnicodeToUTF8( &MIB_DomServerTableElement->domServerName.stream, DataTable->sv100_name, TRUE)) { MIB_DomServerTableElement->domServerName.stream = NULL; MIB_DomServerTableElement->domServerName.length = 0; MIB_DomServerTableElement->domServerName.dynamic = FALSE; } else { MIB_DomServerTableElement->domServerName.length = strlen(MIB_DomServerTableElement->domServerName.stream); }#else
MIB_DomServerTableElement->domServerName.stream = SnmpUtilMemAlloc(strlen( DataTable->sv100_name ) + 1 ); MIB_DomServerTableElement->domServerName.length = strlen( DataTable->sv100_name ) ;
// client name
memcpy( MIB_DomServerTableElement->domServerName.stream, DataTable->sv100_name, strlen(DataTable->sv100_name)) ;#endif
MIB_DomServerTableElement ++ ; // and table entry
DataTable ++ ; // advance pointer to next sess entry in buffer
} // for each entry in the data table
// free all of the lan man data
SafeBufferFree( bufptr ) ;
// indicate where to start adding on next pass, if any
First_of_this_block += i ;
} // if data is valid to process
else { // if ERROR_NO_BROWSER_SERVERS_FOUND we are not running in an NetBIOS environment
// in this case we will have an empty table.
nResult = (lmCode == ERROR_NO_BROWSER_SERVERS_FOUND) ? SNMPAPI_NOERROR : SNMPAPI_ERROR; goto Exit; }
} while (ERROR_MORE_DATA == lmCode) ;
// iterate over the table populating the Oid field
if (! build_srvr_entry_oids()) { SNMPDBG(( SNMP_LOG_TRACE, "SNMP: LMMIB2: build_srvr_entry_oids failed\n."));
FreeDomServerTable(); cache_table[C_SRVR_TABLE].bufptr = NULL; nResult = SNMPAPI_ERROR; goto Exit;
}
// Sort the table information using MSC QuickSort routine
qsort( &MIB_DomServerTable.Table[0], MIB_DomServerTable.Len, sizeof(DOM_SERVER_ENTRY), srvr_entry_cmp );
//
//
// Cache table
//
//
if(0 != MIB_DomServerTable.Len) { cache_table[C_SRVR_TABLE].acquisition_time = curr_time ; cache_table[C_SRVR_TABLE].bufptr = bufptr ; }
//
//
// Return piece of information requested
//
//
Exit: return nResult;} // MIB_srvr_get
//
// MIB_srvr_cmp
// Routine for sorting the session table.
//
// Notes:
//
// Return Codes:
// SNMPAPI_NOERROR
// SNMPAPI_ERROR
//
// Error Codes:
// None.
//
int __cdecl srvr_entry_cmp( IN const DOM_SERVER_ENTRY *A, IN const DOM_SERVER_ENTRY *B )
{ // Compare the OID's
return SnmpUtilOidCmp( (AsnObjectIdentifier *)&A->Oid, (AsnObjectIdentifier *)&B->Oid );} // MIB_srvr_cmp
//
// None.
//
BOOL build_srvr_entry_oids( )
{ AsnOctetString OSA ; DOM_SERVER_ENTRY *DomServerEntry ; unsigned i;
// start pointer at 1st guy in the table
DomServerEntry = MIB_DomServerTable.Table ;
// now iterate over the table, creating an oid for each entry
for( i=0; i<MIB_DomServerTable.Len ; i++) { // for each entry in the session table
OSA.stream = DomServerEntry->domServerName.stream ; OSA.length = DomServerEntry->domServerName.length ; OSA.dynamic = FALSE;
// Make the entry's OID from string index
if (! MakeOidFromStr( &OSA, &DomServerEntry->Oid )) { return FALSE; }
DomServerEntry++; // point to the next guy in the table
} // for
return TRUE;} // build_srvr_entry_oids
void FreeDomServerTable(){ UINT i; DOM_SERVER_ENTRY *MIB_DomServerTableElement ; MIB_DomServerTableElement = MIB_DomServerTable.Table ; if (MIB_DomServerTableElement) { // iterate over the whole table
for(i=0; i<MIB_DomServerTable.Len ;i++) { // free any alloc'ed elements of the structure
SnmpUtilOidFree(&(MIB_DomServerTableElement->Oid)); SnmpUtilMemFree(MIB_DomServerTableElement->domServerName.stream);
MIB_DomServerTableElement ++ ; // increment table entry
} SnmpUtilMemFree(MIB_DomServerTable.Table) ; // free the base Table
} MIB_DomServerTable.Table = NULL ; // just for safety
MIB_DomServerTable.Len = 0 ; // just for safety
}//-------------------------------- END --------------------------------------
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