#!/usr/bin/env python

"""
$Id$

Copyright (c) 2006-2011 sqlmap developers (http://www.sqlmap.org/)
See the file 'doc/COPYING' for copying permission
"""

from lib.core.common import Backend
from lib.core.common import isTechniqueAvailable
from lib.core.common import randomStr
from lib.core.common import safeSQLIdentificatorNaming
from lib.core.common import unsafeSQLIdentificatorNaming
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.data import queries
from lib.core.enums import PAYLOAD
from lib.core.exception import sqlmapMissingMandatoryOptionException
from lib.core.exception import sqlmapNoneDataException
from plugins.generic.enumeration import Enumeration as GenericEnumeration

class Enumeration(GenericEnumeration):
    def __init__(self):
        GenericEnumeration.__init__(self)

        kb.data.processChar = lambda x: x.replace('_', ' ') if x else x

    def getPasswordHashes(self):
        warnMsg = "on SAP MaxDB it is not possible to enumerate the user password hashes"
        logger.warn(warnMsg)

        return {}

    def getDbs(self):
        if len(kb.data.cachedDbs) > 0:
            return kb.data.cachedDbs

        infoMsg = "fetching database names"
        logger.info(infoMsg)

        rootQuery = queries[Backend.getIdentifiedDbms()].dbs
        randStr = randomStr()
        query = rootQuery.inband.query
        retVal = self.__pivotDumpTable("(%s) AS %s" % (query, randStr), ['%s.schemaname' % randStr], blind=True)

        if retVal:
            kb.data.cachedDbs = retVal[0].values()[0]

        return kb.data.cachedDbs

    def getTables(self, bruteForce=None):
        if len(kb.data.cachedTables) > 0:
            return kb.data.cachedTables

        self.forceDbmsEnum()

        if conf.db == "CD":
            conf.db = self.getCurrentDb()

        if conf.db:
            dbs = conf.db.split(",")
        else:
            dbs = self.getDbs()

        for db in dbs:
            dbs[dbs.index(db)] = safeSQLIdentificatorNaming(db)

        infoMsg = "fetching tables for database"
        infoMsg += "%s: %s" % ("s" if len(dbs) > 1 else "", ", ".join(db for db in dbs))
        logger.info(infoMsg)

        rootQuery = queries[Backend.getIdentifiedDbms()].tables

        for db in dbs:
            randStr = randomStr()
            query = rootQuery.inband.query % (("'%s'" % db) if db != "USER" else 'USER')
            retVal = self.__pivotDumpTable("(%s) AS %s" % (query, randStr), ['%s.tablename' % randStr], blind=True)

            if retVal:
                for table in retVal[0].values()[0]:
                    if not kb.data.cachedTables.has_key(db):
                        kb.data.cachedTables[db] = [table]
                    else:
                        kb.data.cachedTables[db].append(table)

        return kb.data.cachedTables

    def getColumns(self, onlyColNames=False):
        self.forceDbmsEnum()

        if conf.db is None or conf.db == "CD":
            if conf.db is None:
                warnMsg = "missing database parameter, sqlmap is going "
                warnMsg += "to use the current database to enumerate "
                warnMsg += "table(s) columns"
                logger.warn(warnMsg)

            conf.db = self.getCurrentDb()

        elif conf.db is not None:
            if  ',' in conf.db:
                errMsg = "only one database name is allowed when enumerating "
                errMsg += "the tables' columns"
                raise sqlmapMissingMandatoryOptionException, errMsg

        conf.db = safeSQLIdentificatorNaming(conf.db)

        if conf.tbl:
            tblList = conf.tbl.split(",")
        else:
            self.getTables()

            if len(kb.data.cachedTables) > 0:
                tblList = kb.data.cachedTables.values()

                if isinstance(tblList[0], (set, tuple, list)):
                    tblList = tblList[0]
            else:
                errMsg = "unable to retrieve the tables"
                errMsg += "on database '%s'" % conf.db
                raise sqlmapNoneDataException, errMsg

        for tbl in tblList:
            tblList[tblList.index(tbl)] = safeSQLIdentificatorNaming(tbl, True)

        rootQuery = queries[Backend.getIdentifiedDbms()].columns

        for tbl in tblList:
            if conf.db is not None and len(kb.data.cachedColumns) > 0 \
              and conf.db in kb.data.cachedColumns and tbl in \
              kb.data.cachedColumns[conf.db]:
                infoMsg = "fetched tables' columns on "
                infoMsg += "database '%s'" % conf.db
                logger.info(infoMsg)

                return { conf.db: kb.data.cachedColumns[conf.db]}

            infoMsg = "fetching columns "
            infoMsg += "for table '%s' " % tbl
            infoMsg += "on database '%s'" % conf.db
            logger.info(infoMsg)

            randStr = randomStr()
            query = rootQuery.inband.query % (unsafeSQLIdentificatorNaming(tbl), ("'%s'" % unsafeSQLIdentificatorNaming(conf.db)) if unsafeSQLIdentificatorNaming(conf.db) != "USER" else 'USER')
            retVal = self.__pivotDumpTable("(%s) AS %s" % (query, randStr), ['%s.columnname' % randStr,'%s.datatype' % randStr,'%s.len' % randStr], blind=True)

            if retVal:
                table = {}
                columns = {}

                for columnname, datatype, length in zip(retVal[0]["%s.columnname" % randStr], retVal[0]["%s.datatype" % randStr], retVal[0]["%s.len" % randStr]):
                    columns[safeSQLIdentificatorNaming(columnname)] = "%s(%s)" % (datatype, length)

                table[tbl] = columns
                kb.data.cachedColumns[conf.db] = table

        return kb.data.cachedColumns

    def searchDb(self):
        warnMsg = "on SAP MaxDB it is not possible to search databases"
        logger.warn(warnMsg)

        return []