#!/usr/bin/env python

"""
Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""

from __future__ import print_function

import difflib
import threading
import time
import traceback

from lib.core.compat import WichmannHill
from lib.core.compat import xrange
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.datatype import AttribDict
from lib.core.enums import PAYLOAD
from lib.core.exception import SqlmapBaseException
from lib.core.exception import SqlmapConnectionException
from lib.core.exception import SqlmapThreadException
from lib.core.exception import SqlmapUserQuitException
from lib.core.exception import SqlmapValueException
from lib.core.settings import MAX_NUMBER_OF_THREADS
from lib.core.settings import PYVERSION

shared = AttribDict()

class _ThreadData(threading.local):
    """
    Represents thread independent data
    """

    def __init__(self):
        self.reset()

    def reset(self):
        """
        Resets thread data model
        """

        self.disableStdOut = False
        self.hashDBCursor = None
        self.inTransaction = False
        self.lastCode = None
        self.lastComparisonPage = None
        self.lastComparisonHeaders = None
        self.lastComparisonCode = None
        self.lastComparisonRatio = None
        self.lastErrorPage = tuple()
        self.lastHTTPError = None
        self.lastRedirectMsg = None
        self.lastQueryDuration = 0
        self.lastPage = None
        self.lastRequestMsg = None
        self.lastRequestUID = 0
        self.lastRedirectURL = tuple()
        self.random = WichmannHill()
        self.resumed = False
        self.retriesCount = 0
        self.seqMatcher = difflib.SequenceMatcher(None)
        self.shared = shared
        self.technique = None
        self.validationRun = 0
        self.valueStack = []

ThreadData = _ThreadData()

def readInput(message, default=None, checkBatch=True, boolean=False):
    # It will be overwritten by original from lib.core.common
    pass

def getCurrentThreadData():
    """
    Returns current thread's local data
    """

    return ThreadData

def getCurrentThreadName():
    """
    Returns current's thread name
    """

    return threading.current_thread().getName()

def exceptionHandledFunction(threadFunction, silent=False):
    try:
        threadFunction()
    except KeyboardInterrupt:
        kb.threadContinue = False
        kb.threadException = True
        raise
    except Exception as ex:
        if not silent and kb.get("threadContinue"):
            errMsg = ex.message if isinstance(ex, SqlmapBaseException) else "%s: %s" % (type(ex).__name__, ex.message)
            logger.error("thread %s: '%s'" % (threading.currentThread().getName(), errMsg))

            if conf.get("verbose") > 1 and not isinstance(ex, (SqlmapUserQuitException, SqlmapConnectionException)):
                traceback.print_exc()

def setDaemon(thread):
    # Reference: http://stackoverflow.com/questions/190010/daemon-threads-explanation
    if PYVERSION >= "2.6":
        thread.daemon = True
    else:
        thread.setDaemon(True)

def runThreads(numThreads, threadFunction, cleanupFunction=None, forwardException=True, threadChoice=False, startThreadMsg=True):
    threads = []

    kb.threadContinue = True
    kb.threadException = False
    kb.technique = ThreadData.technique

    if threadChoice and numThreads == 1 and not (kb.injection.data and not any(_ not in (PAYLOAD.TECHNIQUE.TIME, PAYLOAD.TECHNIQUE.STACKED) for _ in kb.injection.data)):
        while True:
            message = "please enter number of threads? [Enter for %d (current)] " % numThreads
            choice = readInput(message, default=str(numThreads))
            if choice:
                skipThreadCheck = False
                if choice.endswith('!'):
                    choice = choice[:-1]
                    skipThreadCheck = True
                if choice.isdigit():
                    if int(choice) > MAX_NUMBER_OF_THREADS and not skipThreadCheck:
                        errMsg = "maximum number of used threads is %d avoiding potential connection issues" % MAX_NUMBER_OF_THREADS
                        logger.critical(errMsg)
                    else:
                        conf.threads = numThreads = int(choice)
                        break

        if numThreads == 1:
            warnMsg = "running in a single-thread mode. This could take a while"
            logger.warn(warnMsg)

    try:
        if numThreads > 1:
            if startThreadMsg:
                infoMsg = "starting %d threads" % numThreads
                logger.info(infoMsg)
        else:
            threadFunction()
            return

        # Start the threads
        for numThread in xrange(numThreads):
            thread = threading.Thread(target=exceptionHandledFunction, name=str(numThread), args=[threadFunction])

            setDaemon(thread)

            try:
                thread.start()
            except Exception as ex:
                errMsg = "error occurred while starting new thread ('%s')" % ex
                logger.critical(errMsg)
                break

            threads.append(thread)

        # And wait for them to all finish
        alive = True
        while alive:
            alive = False
            for thread in threads:
                if thread.isAlive():
                    alive = True
                    time.sleep(0.1)

    except (KeyboardInterrupt, SqlmapUserQuitException) as ex:
        print()
        kb.prependFlag = False
        kb.threadContinue = False
        kb.threadException = True

        if numThreads > 1:
            logger.info("waiting for threads to finish%s" % (" (Ctrl+C was pressed)" if isinstance(ex, KeyboardInterrupt) else ""))
        try:
            while (threading.activeCount() > 1):
                pass

        except KeyboardInterrupt:
            raise SqlmapThreadException("user aborted (Ctrl+C was pressed multiple times)")

        if forwardException:
            raise

    except (SqlmapConnectionException, SqlmapValueException) as ex:
        print()
        kb.threadException = True
        logger.error("thread %s: '%s'" % (threading.currentThread().getName(), ex))

        if conf.get("verbose") > 1:
            traceback.print_exc()

    except:
        from lib.core.common import unhandledExceptionMessage

        print()
        kb.threadException = True
        errMsg = unhandledExceptionMessage()
        logger.error("thread %s: %s" % (threading.currentThread().getName(), errMsg))
        traceback.print_exc()

    finally:
        kb.threadContinue = True
        kb.threadException = False
        kb.technique = None

        for lock in kb.locks.values():
            if lock.locked():
                try:
                    lock.release()
                except:
                    pass

        if conf.get("hashDB"):
            conf.hashDB.flush(True)

        if cleanupFunction:
            cleanupFunction()