#!/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
"""



import os
import re
import time

from lib.core.common import dataToSessionFile
from lib.core.common import paramToDict
from lib.core.common import parseTargetUrl
from lib.core.common import readInput
from lib.core.convert import urldecode
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.data import paths
from lib.core.dump import dumper
from lib.core.exception import sqlmapFilePathException
from lib.core.exception import sqlmapGenericException
from lib.core.exception import sqlmapSyntaxException
from lib.core.session import resumeConfKb


def __setRequestParams():
    """
    Check and set the parameters and perform checks on 'data' option for
    HTTP method POST.
    """

    __testableParameters = False

    # Perform checks on GET parameters
    if conf.parameters.has_key("GET") and conf.parameters["GET"]:
        parameters = conf.parameters["GET"]
        __paramDict = paramToDict("GET", parameters)

        if __paramDict:
            conf.paramDict["GET"] = __paramDict
            __testableParameters = True

    # Perform checks on POST parameters
    if conf.method == "POST" and not conf.data:
        errMsg = "HTTP POST method depends on HTTP data value to be posted"
        raise sqlmapSyntaxException, errMsg

    if conf.data:
        urlDecodedData = urldecode(conf.data).replace("%", "%%")
        conf.parameters["POST"] = urlDecodedData
        __paramDict = paramToDict("POST", urlDecodedData)

        if __paramDict:
            conf.paramDict["POST"] = __paramDict
            __testableParameters = True

    # Perform checks on Cookie parameters
    if conf.cookie:
        urlDecodedCookie = urldecode(conf.cookie).replace("%", "%%")
        conf.parameters["Cookie"] = urlDecodedCookie
        __paramDict = paramToDict("Cookie", urlDecodedCookie)

        if __paramDict:
            conf.paramDict["Cookie"] = __paramDict
            __testableParameters = True

    # Perform checks on User-Agent header value
    if conf.httpHeaders:
        for httpHeader, headerValue in conf.httpHeaders:
            if httpHeader == "User-Agent":
                conf.parameters["User-Agent"] = urldecode(headerValue).replace("%", "%%")

                condition  = not conf.testParameter
                condition |= "User-Agent" in conf.testParameter
                condition |= "user-agent" in conf.testParameter
                condition |= "useragent" in conf.testParameter
                condition |= "ua" in conf.testParameter

                if condition:
                    conf.paramDict["User-Agent"] = { "User-Agent": headerValue }
                    __testableParameters = True

    if not conf.parameters:
        errMsg  = "you did not provide any GET, POST and Cookie "
        errMsg += "parameter, neither an User-Agent header"
        raise sqlmapGenericException, errMsg

    elif not __testableParameters:
        errMsg  = "all testable parameters you provided are not present "
        errMsg += "within the GET, POST and Cookie parameters"
        raise sqlmapGenericException, errMsg


def __setOutputResume():
    """
    Check and set the output text file and the resume functionality.
    """

    if conf.sessionFile and os.path.exists(conf.sessionFile):
        readSessionFP = open(conf.sessionFile, "r")
        lines = readSessionFP.readlines()

        for line in lines:
            if line.count("][") == 4:
                line = line.split("][")

                if len(line) != 5:
                    continue

                url, _, _, expression, value = line

                if not value:
                    continue

                if url[0] == "[":
                    url = url[1:]

                if value[-1] == "\n":
                    value = value[:-1]

                if url != conf.url:
                    continue

                if url not in kb.resumedQueries.keys():
                    kb.resumedQueries[url] = {}
                    kb.resumedQueries[url][expression] = value

                resumeConfKb(expression, url, value)

                if expression not in kb.resumedQueries[url].keys():
                    kb.resumedQueries[url][expression] = value
                elif len(value) >= len(kb.resumedQueries[url][expression]):
                    kb.resumedQueries[url][expression] = value

        readSessionFP.close()

    if conf.sessionFile:
        try:
            conf.sessionFP = open(conf.sessionFile, "a")
            dataToSessionFile("\n[%s]\n" % time.strftime("%X %x"))
        except IOError:
            errMsg = "unable to write on the session file specified"
            raise sqlmapFilePathException, errMsg


def __createFilesDir():
    """
    Create the file directory.
    """

    if not conf.rFile:
        return

    conf.filePath = paths.SQLMAP_FILES_PATH % conf.hostname

    if not os.path.isdir(conf.filePath):
        os.makedirs(conf.filePath, 0755)


def __createDumpDir():
    """
    Create the dump directory.
    """

    if not conf.dumpTable and not conf.dumpAll:
        return

    conf.dumpPath = paths.SQLMAP_DUMP_PATH % conf.hostname

    if not os.path.isdir(conf.dumpPath):
        os.makedirs(conf.dumpPath, 0755)


def initTargetEnv():
    """
    Initialize target environment.
    """

    parseTargetUrl()
    __setRequestParams()
    __setOutputResume()


def createTargetDirs():
    """
    Create the output directory.
    """

    conf.outputPath = "%s%s%s" % (paths.SQLMAP_OUTPUT_PATH, os.sep, conf.hostname)

    if not os.path.isdir(paths.SQLMAP_OUTPUT_PATH):
        os.makedirs(paths.SQLMAP_OUTPUT_PATH, 0755)

    if not os.path.isdir(conf.outputPath):
        os.makedirs(conf.outputPath, 0755)

    dumper.setOutputFile()

    __createDumpDir()
    __createFilesDir()