pykd/samples/km/drvobj.py

from pykd import *
import sys


def loadSymbols():
   global nt
   nt = loadModule( "nt" )


def getObjectInDir( dirObj, objName ):

    if objName.find( "\\" ) != -1:
        ( dirSubName, objSubName ) =  objName.split("\\", 1)
    else:
        dirSubName = objName
 
    for i in range( 0, 37 ):

       if dirObj.HashBuckets[i] != 0:
          dirEntry = typedVar( "nt!_OBJECT_DIRECTORY_ENTRY", dirObj.HashBuckets[i] )

          while dirEntry != 0:

              objHeader = containingRecord( dirEntry.Object, "nt!_OBJECT_HEADER", "Body" )

              objName = typedVar( "nt!_OBJECT_HEADER_NAME_INFO",  objHeader.getAddress() - objHeader.NameInfoOffset )
              name = loadUnicodeString( objName.Name.getAddress() )

              if name.lower() == dirSubName.lower():

                if objHeader.Type == ptrPtr( nt.ObpDirectoryObjectType ):
                    return getObjectInDir( typedVar( "nt!_OBJECT_DIRECTORY", dirEntry.Object), objSubName )
                else:
                    return  dirEntry.Object

              if dirEntry.ChainLink != 0:
                  dirEntry = typedVar( "nt!_OBJECT_DIRECTORY_ENTRY", dirEntry.ChainLink )
              else:
                  dirEntry = 0    


def getObjectByName( objName ):

    if len(objName)==0: 
        return

    if objName[0] != '\\':
        return

    rootDir = typedVar( "nt!_OBJECT_DIRECTORY", ptrPtr( nt.ObpRootDirectoryObject ) )
   
    return getObjectInDir( rootDir, objName[1:] )



def printDrvMajorTable( drvName ):

    objName = "\\Driver\\" + drvName
    drvObjPtr = getObjectByName( objName )
    
    if drvObjPtr == None:
        dprintln( "object not found" )
        return
 
    drvObj = typedVar( "nt!_DRIVER_OBJECT", drvObjPtr )
     
    for i in range( len(drvObj.MajorFunction) ):
        dprintln( "MajorFunction[%d] = %s" % ( i, findSymbol( drvObj.MajorFunction[i] ) ) )

def run():
   loadSymbols();

   printDrvMajorTable( "afd" )

if __name__ == "__main__":

    if not isWindbgExt():
       loadDump( sys.argv[1] )

    run()