/local/proxy.py

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#!/usr/bin/env python
# coding:utf-8
# Based on GAppProxy 2.0.0 by Du XiaoGang <dugang.2008@gmail.com>
# Based on WallProxy 0.4.0 by Hust Moon <www.ehust@gmail.com>
# Contributor:
#      Phus Lu           <phus.lu@gmail.com>
#      Hewig Xu          <hewigovens@gmail.com>
#      Ayanamist Yang    <ayanamist@gmail.com>
#      V.E.O             <V.E.O@tom.com>
#      Max Lv            <max.c.lv@gmail.com>
#      AlsoTang          <alsotang@gmail.com>
#      Christopher Meng  <i@cicku.me>
#      Yonsm Guo         <YonsmGuo@gmail.com>
#      Parkman           <cseparkman@gmail.com>
#      Ming Bai          <mbbill@gmail.com>
#      Bin Yu            <yubinlove1991@gmail.com>
#      lileixuan         <lileixuan@gmail.com>
#      Cong Ding         <cong@cding.org>
#      Zhang Youfu       <zhangyoufu@gmail.com>
#      Lu Wei            <luwei@barfoo>
#      Harmony Meow      <harmony.meow@gmail.com>
#      logostream        <logostream@gmail.com>
#      Rui Wang          <isnowfy@gmail.com>
#      Wang Wei Qiang    <wwqgtxx@gmail.com>
#      Felix Yan         <felixonmars@gmail.com>
#      Sui Feng          <suifeng.me@qq.com>
#      QXO               <qxodream@gmail.com>
#      Geek An           <geekan@foxmail.com>
#      Poly Rabbit       <mcx_221@foxmail.com>
#      oxnz              <yunxinyi@gmail.com>
#      Shusen Liu        <liushusen.smart@gmail.com>
#      Yad Smood         <y.s.inside@gmail.com>
#      Chen Shuang       <cs0x7f@gmail.com>
#      cnfuyu            <cnfuyu@gmail.com>
#      cuixin            <steven.cuixin@gmail.com>
#      s2marine0         <s2marine0@gmail.com>
#      Toshio Xiang      <snachx@gmail.com>
#      Bo Tian           <dxmtb@163.com>
#      Virgil            <variousvirgil@gmail.com>
#      hub01             <miaojiabumiao@yeah.net>
#      v3aqb             <sgzz.cj@gmail.com>
#      Oling Cat         <olingcat@gmail.com>

__version__ = '3.1.11'

import sys
import os
import glob

reload(sys).setdefaultencoding('UTF-8')
sys.dont_write_bytecode = True
sys.path += glob.glob('%s/*.egg' % os.path.dirname(os.path.abspath(__file__)))

try:
    import gevent
    import gevent.socket
    import gevent.server
    import gevent.queue
    import gevent.monkey
    gevent.monkey.patch_all(subprocess=True)
except ImportError:
    gevent = None
except TypeError:
    gevent.monkey.patch_all()
    sys.stderr.write('\033[31m  Warning: Please update gevent to the latest 1.0 version!\033[0m\n')

import errno
import time
import struct
import collections
import binascii
import zlib
import itertools
import re
import io
import fnmatch
import traceback
import random
import base64
import string
import hashlib
import threading
import thread
import socket
import ssl
import select
import Queue
import SocketServer
import ConfigParser
import BaseHTTPServer
import httplib
import urllib2
import urlparse
try:
    import dnslib
except ImportError:
    dnslib = None
try:
    import OpenSSL
except ImportError:
    OpenSSL = None
try:
    import pygeoip
except ImportError:
    pygeoip = None


HAS_PYPY = hasattr(sys, 'pypy_version_info')
NetWorkIOError = (socket.error, ssl.SSLError, OSError) if not OpenSSL else (socket.error, ssl.SSLError, OpenSSL.SSL.Error, OSError)


class Logging(type(sys)):
    CRITICAL = 50
    FATAL = CRITICAL
    ERROR = 40
    WARNING = 30
    WARN = WARNING
    INFO = 20
    DEBUG = 10
    NOTSET = 0

    def __init__(self, *args, **kwargs):
        self.level = self.__class__.INFO
        self.__set_error_color = lambda: None
        self.__set_warning_color = lambda: None
        self.__set_debug_color = lambda: None
        self.__reset_color = lambda: None
        if hasattr(sys.stderr, 'isatty') and sys.stderr.isatty():
            if os.name == 'nt':
                import ctypes
                SetConsoleTextAttribute = ctypes.windll.kernel32.SetConsoleTextAttribute
                GetStdHandle = ctypes.windll.kernel32.GetStdHandle
                self.__set_error_color = lambda: SetConsoleTextAttribute(GetStdHandle(-11), 0x04)
                self.__set_warning_color = lambda: SetConsoleTextAttribute(GetStdHandle(-11), 0x06)
                self.__set_debug_color = lambda: SetConsoleTextAttribute(GetStdHandle(-11), 0x002)
                self.__reset_color = lambda: SetConsoleTextAttribute(GetStdHandle(-11), 0x07)
            elif os.name == 'posix':
                self.__set_error_color = lambda: sys.stderr.write('\033[31m')
                self.__set_warning_color = lambda: sys.stderr.write('\033[33m')
                self.__set_debug_color = lambda: sys.stderr.write('\033[32m')
                self.__reset_color = lambda: sys.stderr.write('\033[0m')

    @classmethod
    def getLogger(cls, *args, **kwargs):
        return cls(*args, **kwargs)

    def basicConfig(self, *args, **kwargs):
        self.level = int(kwargs.get('level', self.__class__.INFO))
        if self.level > self.__class__.DEBUG:
            self.debug = self.dummy

    def log(self, level, fmt, *args, **kwargs):
        sys.stderr.write('%s - [%s] %s\n' % (level, time.ctime()[4:-5], fmt % args))

    def dummy(self, *args, **kwargs):
        pass

    def debug(self, fmt, *args, **kwargs):
        self.__set_debug_color()
        self.log('DEBUG', fmt, *args, **kwargs)
        self.__reset_color()

    def info(self, fmt, *args, **kwargs):
        self.log('INFO', fmt, *args)

    def warning(self, fmt, *args, **kwargs):
        self.__set_warning_color()
        self.log('WARNING', fmt, *args, **kwargs)
        self.__reset_color()

    def warn(self, fmt, *args, **kwargs):
        self.warning(fmt, *args, **kwargs)

    def error(self, fmt, *args, **kwargs):
        self.__set_error_color()
        self.log('ERROR', fmt, *args, **kwargs)
        self.__reset_color()

    def exception(self, fmt, *args, **kwargs):
        self.error(fmt, *args, **kwargs)
        sys.stderr.write(traceback.format_exc() + '\n')

    def critical(self, fmt, *args, **kwargs):
        self.__set_error_color()
        self.log('CRITICAL', fmt, *args, **kwargs)
        self.__reset_color()
logging = sys.modules['logging'] = Logging('logging')


class LRUCache(object):
    """http://pypi.python.org/pypi/lru/"""

    def __init__(self, max_items=100):
        self.cache = {}
        self.key_order = []
        self.max_items = max_items

    def __setitem__(self, key, value):
        self.cache[key] = value
        self._mark(key)

    def __getitem__(self, key):
        value = self.cache[key]
        self._mark(key)
        return value

    def __contains__(self, key):
        return key in self.cache

    def _mark(self, key):
        if key in self.key_order:
            self.key_order.remove(key)
        self.key_order.insert(0, key)
        if len(self.key_order) > self.max_items:
            index = self.max_items // 2
            delitem = self.cache.__delitem__
            key_order = self.key_order
            any(delitem(key_order[x]) for x in xrange(index, len(key_order)))
            self.key_order = self.key_order[:index]

    def clear(self):
        self.cache = {}
        self.key_order = []


class CertUtil(object):
    """CertUtil module, based on mitmproxy"""

    ca_vendor = 'GoAgent'
    ca_keyfile = 'CA.crt'
    ca_certdir = 'certs'
    ca_lock = threading.Lock()

    @staticmethod
    def create_ca():
        key = OpenSSL.crypto.PKey()
        key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)
        ca = OpenSSL.crypto.X509()
        ca.set_serial_number(0)
        ca.set_version(2)
        subj = ca.get_subject()
        subj.countryName = 'CN'
        subj.stateOrProvinceName = 'Internet'
        subj.localityName = 'Cernet'
        subj.organizationName = CertUtil.ca_vendor
        subj.organizationalUnitName = '%s Root' % CertUtil.ca_vendor
        subj.commonName = '%s CA' % CertUtil.ca_vendor
        ca.gmtime_adj_notBefore(0)
        ca.gmtime_adj_notAfter(24 * 60 * 60 * 3652)
        ca.set_issuer(ca.get_subject())
        ca.set_pubkey(key)
        ca.add_extensions([
            OpenSSL.crypto.X509Extension(b'basicConstraints', True, b'CA:TRUE'),
            OpenSSL.crypto.X509Extension(b'nsCertType', True, b'sslCA'),
            OpenSSL.crypto.X509Extension(b'extendedKeyUsage', True, b'serverAuth,clientAuth,emailProtection,timeStamping,msCodeInd,msCodeCom,msCTLSign,msSGC,msEFS,nsSGC'),
            OpenSSL.crypto.X509Extension(b'keyUsage', False, b'keyCertSign, cRLSign'),
            OpenSSL.crypto.X509Extension(b'subjectKeyIdentifier', False, b'hash', subject=ca), ])
        ca.sign(key, 'sha1')
        return key, ca

    @staticmethod
    def dump_ca():
        key, ca = CertUtil.create_ca()
        with open(CertUtil.ca_keyfile, 'wb') as fp:
            fp.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, ca))
            fp.write(OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, key))

    @staticmethod
    def _get_cert(commonname, sans=()):
        with open(CertUtil.ca_keyfile, 'rb') as fp:
            content = fp.read()
            key = OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, content)
            ca = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, content)

        pkey = OpenSSL.crypto.PKey()
        pkey.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)

        req = OpenSSL.crypto.X509Req()
        subj = req.get_subject()
        subj.countryName = 'CN'
        subj.stateOrProvinceName = 'Internet'
        subj.localityName = 'Cernet'
        subj.organizationalUnitName = '%s Branch' % CertUtil.ca_vendor
        if commonname[0] == '.':
            subj.commonName = '*' + commonname
            subj.organizationName = '*' + commonname
            sans = ['*'+commonname] + [x for x in sans if x != '*'+commonname]
        else:
            subj.commonName = commonname
            subj.organizationName = commonname
            sans = [commonname] + [x for x in sans if x != commonname]
        #req.add_extensions([OpenSSL.crypto.X509Extension(b'subjectAltName', True, ', '.join('DNS: %s' % x for x in sans)).encode()])
        req.set_pubkey(pkey)
        req.sign(pkey, 'sha1')

        cert = OpenSSL.crypto.X509()
        cert.set_version(2)
        try:
            cert.set_serial_number(int(hashlib.md5(commonname.encode('utf-8')).hexdigest(), 16))
        except OpenSSL.SSL.Error:
            cert.set_serial_number(int(time.time()*1000))
        cert.gmtime_adj_notBefore(0)
        cert.gmtime_adj_notAfter(60 * 60 * 24 * 3652)
        cert.set_issuer(ca.get_subject())
        cert.set_subject(req.get_subject())
        cert.set_pubkey(req.get_pubkey())
        if commonname[0] == '.':
            sans = ['*'+commonname] + [s for s in sans if s != '*'+commonname]
        else:
            sans = [commonname] + [s for s in sans if s != commonname]
        #cert.add_extensions([OpenSSL.crypto.X509Extension(b'subjectAltName', True, ', '.join('DNS: %s' % x for x in sans))])
        cert.sign(key, 'sha1')

        certfile = os.path.join(CertUtil.ca_certdir, commonname + '.crt')
        with open(certfile, 'wb') as fp:
            fp.write(OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, cert))
            fp.write(OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, pkey))
        return certfile

    @staticmethod
    def get_cert(commonname, sans=()):
        if commonname.count('.') >= 2 and [len(x) for x in reversed(commonname.split('.'))] > [2, 4]:
            commonname = '.'+commonname.partition('.')[-1]
        certfile = os.path.join(CertUtil.ca_certdir, commonname + '.crt')
        if os.path.exists(certfile):
            return certfile
        elif OpenSSL is None:
            return CertUtil.ca_keyfile
        else:
            with CertUtil.ca_lock:
                if os.path.exists(certfile):
                    return certfile
                return CertUtil._get_cert(commonname, sans)

    @staticmethod
    def import_ca(certfile):
        commonname = os.path.splitext(os.path.basename(certfile))[0]
        sha1digest = 'AB:70:2C:DF:18:EB:E8:B4:38:C5:28:69:CD:4A:5D:EF:48:B4:0E:33'
        if OpenSSL:
            try:
                with open(certfile, 'rb') as fp:
                    x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, fp.read())
                    commonname = next(v.decode() for k, v in x509.get_subject().get_components() if k == b'O')
                    sha1digest = x509.digest('sha1')
            except StandardError as e:
                logging.error('load_certificate(certfile=%r) failed:%s', certfile, e)
        if sys.platform.startswith('win'):
            import ctypes
            with open(certfile, 'rb') as fp:
                certdata = fp.read()
                if certdata.startswith(b'-----'):
                    begin = b'-----BEGIN CERTIFICATE-----'
                    end = b'-----END CERTIFICATE-----'
                    certdata = base64.b64decode(b''.join(certdata[certdata.find(begin)+len(begin):certdata.find(end)].strip().splitlines()))
                crypt32 = ctypes.WinDLL(b'crypt32.dll'.decode())
                store_handle = crypt32.CertOpenStore(10, 0, 0, 0x4000 | 0x20000, b'ROOT'.decode())
                if not store_handle:
                    return -1
                X509_ASN_ENCODING = 0x00000001
                CERT_FIND_HASH = 0x10000
                class CRYPT_HASH_BLOB(ctypes.Structure):
                    _fields_ = [('cbData', ctypes.c_ulong), ('pbData', ctypes.c_char_p)]
                crypt_hash = CRYPT_HASH_BLOB(20, binascii.a2b_hex(sha1digest.replace(':', '')))
                crypt_handle = crypt32.CertFindCertificateInStore(store_handle, X509_ASN_ENCODING, 0, CERT_FIND_HASH, ctypes.byref(crypt_hash), None)
                if crypt_handle:
                    crypt32.CertFreeCertificateContext(crypt_handle)
                    return 0
                ret = crypt32.CertAddEncodedCertificateToStore(store_handle, 0x1, certdata, len(certdata), 4, None)
                crypt32.CertCloseStore(store_handle, 0)
                del crypt32
                return 0 if ret else -1
        elif sys.platform == 'darwin':
            return os.system(('security find-certificate -a -c "%s" | grep "%s" >/dev/null || security add-trusted-cert -d -r trustRoot -k "/Library/Keychains/System.keychain" "%s"' % (commonname, commonname, certfile.decode('utf-8'))).encode('utf-8'))
        elif sys.platform.startswith('linux'):
            import platform
            platform_distname = platform.dist()[0]
            if platform_distname == 'Ubuntu':
                pemfile = "/etc/ssl/certs/%s.pem" % commonname
                new_certfile = "/usr/local/share/ca-certificates/%s.crt" % commonname
                if not os.path.exists(pemfile):
                    return os.system('cp "%s" "%s" && update-ca-certificates' % (certfile, new_certfile))
            elif any(os.path.isfile('%s/certutil' % x) for x in os.environ['PATH'].split(os.pathsep)):
                return os.system('certutil -L -d sql:$HOME/.pki/nssdb | grep "%s" || certutil -d sql:$HOME/.pki/nssdb -A -t "C,," -n "%s" -i "%s"' % (commonname, commonname, certfile))
            else:
                logging.warning('please install *libnss3-tools* package to import GoAgent root ca')
        return 0

    @staticmethod
    def check_ca():
        #Check CA exists
        capath = os.path.join(os.path.dirname(os.path.abspath(__file__)), CertUtil.ca_keyfile)
        certdir = os.path.join(os.path.dirname(os.path.abspath(__file__)), CertUtil.ca_certdir)
        if not os.path.exists(capath):
            if not OpenSSL:
                logging.critical('CA.key is not exist and OpenSSL is disabled, ABORT!')
                sys.exit(-1)
            if os.path.exists(certdir):
                if os.path.isdir(certdir):
                    any(os.remove(x) for x in glob.glob(certdir+'/*.crt')+glob.glob(certdir+'/.*.crt'))
                else:
                    os.remove(certdir)
                    os.mkdir(certdir)
            CertUtil.dump_ca()
        if glob.glob('%s/*.key' % CertUtil.ca_certdir):
            for filename in glob.glob('%s/*.key' % CertUtil.ca_certdir):
                try:
                    os.remove(filename)
                    os.remove(os.path.splitext(filename)[0]+'.crt')
                except EnvironmentError:
                    pass
        #Check CA imported
        if CertUtil.import_ca(capath) != 0:
            logging.warning('install root certificate failed, Please run as administrator/root/sudo')
        #Check Certs Dir
        if not os.path.exists(certdir):
            os.makedirs(certdir)


class DetectMobileBrowser:
    """detect mobile function from http://detectmobilebrowsers.com"""
    regex_match_a  = re.compile(r"(android|bb\\d+|meego).+mobile|avantgo|bada\\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino", re.I|re.M).search
    regex_match_b = re.compile(r"1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\\-(n|u)|c55\\/|capi|ccwa|cdm\\-|cell|chtm|cldc|cmd\\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\\-s|devi|dica|dmob|do(c|p)o|ds(12|\\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\\-|_)|g1 u|g560|gene|gf\\-5|g\\-mo|go(\\.w|od)|gr(ad|un)|haie|hcit|hd\\-(m|p|t)|hei\\-|hi(pt|ta)|hp( i|ip)|hs\\-c|ht(c(\\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\\-(20|go|ma)|i230|iac( |\\-|\\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\\/)|klon|kpt |kwc\\-|kyo(c|k)|le(no|xi)|lg( g|\\/(k|l|u)|50|54|\\-[a-w])|libw|lynx|m1\\-w|m3ga|m50\\/|ma(te|ui|xo)|mc(01|21|ca)|m\\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\\-2|po(ck|rt|se)|prox|psio|pt\\-g|qa\\-a|qc(07|12|21|32|60|\\-[2-7]|i\\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\\-|oo|p\\-)|sdk\\/|se(c(\\-|0|1)|47|mc|nd|ri)|sgh\\-|shar|sie(\\-|m)|sk\\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\\-|v\\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\\-|tdg\\-|tel(i|m)|tim\\-|t\\-mo|to(pl|sh)|ts(70|m\\-|m3|m5)|tx\\-9|up(\\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\\-|your|zeto|zte\\-", re.I|re.M).search
    
    @staticmethod
    def detect(user_agent):
        return DetectMobileBrowser.regex_match_a(user_agent) or DetectMobileBrowser.regex_match_b(user_agent)


class SSLConnection(object):

    has_gevent = socket.socket is getattr(sys.modules.get('gevent.socket'), 'socket', None)

    def __init__(self, context, sock):
        self._context = context
        self._sock = sock
        self._connection = OpenSSL.SSL.Connection(context, sock)
        self._makefile_refs = 0
        if self.has_gevent:
            self._wait_read = gevent.socket.wait_read
            self._wait_write = gevent.socket.wait_write
            self._wait_readwrite = gevent.socket.wait_readwrite
        else:
            self._wait_read = lambda fd,t: select.select([fd], [], [fd], t)
            self._wait_write = lambda fd,t: select.select([], [fd], [fd], t)
            self._wait_readwrite = lambda fd,t: select.select([fd], [fd], [fd], t)

    def __getattr__(self, attr):
        if attr not in ('_context', '_sock', '_connection', '_makefile_refs'):
            return getattr(self._connection, attr)

    def accept(self):
        sock, addr = self._sock.accept()
        client = OpenSSL.SSL.Connection(sock._context, sock)
        return client, addr

    def do_handshake(self):
        timeout = self._sock.gettimeout()
        while True:
            try:
                self._connection.do_handshake()
                break
            except (OpenSSL.SSL.WantReadError, OpenSSL.SSL.WantX509LookupError, OpenSSL.SSL.WantWriteError):
                sys.exc_clear()
                self._wait_readwrite(self._sock.fileno(), timeout)

    def connect(self, *args, **kwargs):
        timeout = self._sock.gettimeout()
        while True:
            try:
                self._connection.connect(*args, **kwargs)
                break
            except (OpenSSL.SSL.WantReadError, OpenSSL.SSL.WantX509LookupError):
                sys.exc_clear()
                self._wait_read(self._sock.fileno(), timeout)
            except OpenSSL.SSL.WantWriteError:
                sys.exc_clear()
                self._wait_write(self._sock.fileno(), timeout)

    def send(self, data, flags=0):
        timeout = self._sock.gettimeout()
        while True:
            try:
                self._connection.send(data, flags)
                break
            except (OpenSSL.SSL.WantReadError, OpenSSL.SSL.WantX509LookupError):
                sys.exc_clear()
                self._wait_read(self._sock.fileno(), timeout)
            except OpenSSL.SSL.WantWriteError:
                sys.exc_clear()
                self._wait_write(self._sock.fileno(), timeout)
            except OpenSSL.SSL.SysCallError as e:
                if e[0] == -1 and not data:
                    # errors when writing empty strings are expected and can be ignored
                    return 0
                raise

    def recv(self, bufsiz, flags=0):
        timeout = self._sock.gettimeout()
        pending = self._connection.pending()
        if pending:
            return self._connection.recv(min(pending, bufsiz))
        while True:
            try:
                return self._connection.recv(bufsiz, flags)
            except (OpenSSL.SSL.WantReadError, OpenSSL.SSL.WantX509LookupError):
                sys.exc_clear()
                self._wait_read(self._sock.fileno(), timeout)
            except OpenSSL.SSL.WantWriteError:
                sys.exc_clear()
                self._wait_write(self._sock.fileno(), timeout)
            except OpenSSL.SSL.ZeroReturnError:
                return ''

    def read(self, bufsiz, flags=0):
        return self.recv(bufsiz, flags)

    def write(self, buf, flags=0):
        return self.sendall(buf, flags)

    def close(self):
        if self._makefile_refs < 1:
            self._connection = None
            if self._sock:
                socket.socket.close(self._sock)
        else:
            self._makefile_refs -= 1

    def makefile(self, mode='r', bufsize=-1):
        self._makefile_refs += 1
        return socket._fileobject(self, mode, bufsize, close=True)



class ProxyUtil(object):
    """ProxyUtil module, based on urllib2"""

    @staticmethod
    def parse_proxy(proxy):
        return urllib2._parse_proxy(proxy)

    @staticmethod
    def get_system_proxy():
        proxies = urllib2.getproxies()
        return proxies.get('https') or proxies.get('http') or {}

    @staticmethod
    def get_listen_ip():
        listen_ip = '127.0.0.1'
        sock = None
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            sock.connect(('8.8.8.8', 53))
            listen_ip = sock.getsockname()[0]
        except socket.error:
            pass
        finally:
            if sock:
                sock.close()
        return listen_ip


def dnslib_resolve_over_udp(qname, dnsservers, timeout, **kwargs):
    """
    http://gfwrev.blogspot.com/2009/11/gfwdns.html
    http://zh.wikipedia.org/wiki/%E5%9F%9F%E5%90%8D%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%BC%93%E5%AD%98%E6%B1%A1%E6%9F%93
    http://support.microsoft.com/kb/241352
    """
    blacklist = kwargs.get('blacklist', ())
    turstservers = kwargs.get('turstservers', ())
    query = dnslib.DNSRecord(q=dnslib.DNSQuestion(qname))
    query_data = query.pack()
    dns_v4_servers = [x for x in dnsservers if ':' not in x]
    dns_v6_servers = [x for x in dnsservers if ':' in x]
    sock_v4 = sock_v6 = None
    socks = []
    if dns_v4_servers:
        sock_v4 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        socks.append(sock_v4)
    if dns_v6_servers:
        sock_v6 = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
        socks.append(sock_v6)
    timeout_at = time.time() + timeout
    try:
        for _ in xrange(4):
            try:
                for dnsserver in dns_v4_servers:
                    sock_v4.sendto(query_data, (dnsserver, 53))
                for dnsserver in dns_v6_servers:
                    sock_v6.sendto(query_data, (dnsserver, 53))
                while time.time() < timeout_at:
                    ins, _, _ = select.select(socks, [], [], 0.1)
                    for sock in ins:
                        reply_data, (reply_server, _) = sock.recvfrom(512)
                        record = dnslib.DNSRecord.parse(reply_data)
                        rtypes = (1, 28) if sock is sock_v6 else (1,)
                        iplist = [str(x.rdata) for x in record.rr if x.rtype in rtypes]
                        if any(x in blacklist for x in iplist):
                            logging.warning('query qname=%r dnsservers=%r record bad iplist=%r', qname, dnsservers, iplist)
                        elif record.header.rcode and not iplist and reply_server in turstservers:
                            logging.info('query qname=%r trust reply_server=%r record rcode=%s', qname, reply_server, record.header.rcode)
                            return record
                        elif iplist:
                            logging.debug('query qname=%r reply_server=%r record iplist=%s', qname, reply_server, iplist)
                            return record
                        else:
                            logging.debug('query qname=%r reply_server=%r record null iplist=%s', qname, reply_server, iplist)
                            continue
            except socket.error as e:
                logging.warning('handle dns query=%s socket: %r', query, e)
        raise socket.gaierror(11004, 'getaddrinfo %r from %r failed' % (qname, dnsservers))
    finally:
        for sock in socks:
            sock.close()


def dnslib_resolve_over_tcp(qname, dnsservers, timeout, **kwargs):
    """dns query over tcp"""
    blacklist = kwargs.get('blacklist', ())
    def do_resolve(qname, dnsserver, timeout, queobj):
        query = dnslib.DNSRecord(q=dnslib.DNSQuestion(qname))
        query_data = query.pack()
        sock_family = socket.AF_INET6 if ':' in dnsserver else socket.AF_INET
        sock = socket.socket(sock_family)
        rfile = None
        try:
            sock.settimeout(timeout or None)
            sock.connect((dnsserver, 53))
            sock.send(struct.pack('>h', len(query_data)) + query_data)
            rfile = sock.makefile('r', 1024)
            reply_data_length = rfile.read(2)
            if len(reply_data_length) < 2:
                raise socket.gaierror(11004, 'getaddrinfo %r from %r failed' % (qname, dnsserver))
            reply_data = rfile.read(struct.unpack('>h', reply_data_length)[0])
            record = dnslib.DNSRecord.parse(reply_data)
            rtypes = (1, 28) if sock_family is socket.AF_INET6 else (1,)
            iplist = [str(x.rdata) for x in record.rr if x.rtype in rtypes]
            if any(x in blacklist for x in iplist):
                logging.debug('query qname=%r dnsserver=%r record bad iplist=%r', qname, dnsserver, iplist)
                raise socket.gaierror(11004, 'getaddrinfo %r from %r failed' % (qname, dnsserver))
            else:
                logging.debug('query qname=%r dnsserver=%r record iplist=%s', qname, dnsserver, iplist)
                queobj.put(record)
        except socket.error as e:
            logging.debug('query qname=%r dnsserver=%r failed %r', qname, dnsserver, e)
            queobj.put(e)
        finally:
            if rfile:
                rfile.close()
            sock.close()
    queobj = Queue.Queue()
    for dnsserver in dnsservers:
        thread.start_new_thread(do_resolve, (qname, dnsserver, timeout, queobj))
    for i in range(len(dnsservers)):
        try:
            result = queobj.get(timeout)
        except Queue.Empty:
            raise socket.gaierror(11004, 'getaddrinfo %r from %r failed' % (qname, dnsservers))
        if result and not isinstance(result, Exception):
            return result
        elif i == len(dnsservers) - 1:
            logging.warning('dnslib_resolve_over_tcp %r with %s return %r', qname, dnsservers, result)
    raise socket.gaierror(11004, 'getaddrinfo %r from %r failed' % (qname, dnsservers))


def dnslib_record2iplist(record):
    """convert dnslib.DNSRecord to iplist"""
    assert isinstance(record, dnslib.DNSRecord)
    return [str(x.rdata) for x in record.rr if x.rtype in (1, 28)]


def get_dnsserver_list():
    if os.name == 'nt':
        import ctypes, ctypes.wintypes, struct, socket
        DNS_CONFIG_DNS_SERVER_LIST = 6
        buf = ctypes.create_string_buffer(2048)
        ctypes.windll.dnsapi.DnsQueryConfig(DNS_CONFIG_DNS_SERVER_LIST, 0, None, None, ctypes.byref(buf), ctypes.byref(ctypes.wintypes.DWORD(len(buf))))
        ips = struct.unpack('I', buf[0:4])[0]
        out = []
        for i in xrange(ips):
            start = (i+1) * 4
            out.append(socket.inet_ntoa(buf[start:start+4]))
        return out
    elif os.path.isfile('/etc/resolv.conf'):
        with open('/etc/resolv.conf', 'rb') as fp:
            return re.findall(r'(?m)^nameserver\s+(\S+)', fp.read())
    else:
        logging.warning("get_dnsserver_list failed: unsupport platform '%s-%s'", sys.platform, os.name)
        return []


def spawn_later(seconds, target, *args, **kwargs):
    def wrap(*args, **kwargs):
        __import__('time').sleep(seconds)
        return target(*args, **kwargs)
    return __import__('thread').start_new_thread(wrap, args, kwargs)


def is_clienthello(data):
    if len(data) < 20:
        return False
    if data.startswith('\x16\x03'):
        # TLSv12/TLSv11/TLSv1/SSLv3
        length, = struct.unpack('>h', data[3:5])
        return len(data) == 5 + length
    elif data[0] == '\x80' and data[2:4] == '\x01\x03':
        # SSLv23
        return len(data) == 2 + ord(data[1])
    else:
        return False


def extract_sni_name(packet):
    if packet.startswith('\x16\x03'):
        stream = io.BytesIO(packet)
        stream.read(0x2b)
        session_id_length = ord(stream.read(1))
        stream.read(session_id_length)
        cipher_suites_length, = struct.unpack('>h', stream.read(2))
        stream.read(cipher_suites_length+2)
        extensions_length, = struct.unpack('>h', stream.read(2))
        extensions = {}
        while True:
            data = stream.read(2)
            if not data:
                break
            etype, = struct.unpack('>h', data)
            elen, = struct.unpack('>h', stream.read(2))
            edata = stream.read(elen)
            if etype == 0:
                server_name = edata[5:]
                return server_name


class URLFetch(object):
    """URLFetch for gae/php fetchservers"""
    skip_headers = frozenset(['Vary', 'Via', 'X-Forwarded-For', 'Proxy-Authorization', 'Proxy-Connection', 'Upgrade', 'X-Chrome-Variations', 'Connection', 'Cache-Control'])

    def __init__(self, fetchserver, create_http_request):
        assert isinstance(fetchserver, basestring) and callable(create_http_request)
        self.fetchserver = fetchserver
        self.create_http_request = create_http_request

    def fetch(self, method, url, headers, body, timeout, **kwargs):
        if '.appspot.com/' in self.fetchserver:
            response = self.__gae_fetch(method, url, headers, body, timeout, **kwargs)
            response.app_header_parsed = True
        else:
            response = self.__php_fetch(method, url, headers, body, timeout, **kwargs)
            response.app_header_parsed = False
        return response

    def __gae_fetch(self, method, url, headers, body, timeout, **kwargs):
        # deflate = lambda x:zlib.compress(x)[2:-4]
        rc4crypt = lambda s, k: RC4Cipher(k).encrypt(s) if k else s
        if body:
            if len(body) < 10 * 1024 * 1024 and 'Content-Encoding' not in headers:
                zbody = zlib.compress(body)[2:-4]
                if len(zbody) < len(body):
                    body = zbody
                    headers['Content-Encoding'] = 'deflate'
            headers['Content-Length'] = str(len(body))
        # GAE donot allow set `Host` header
        if 'Host' in headers:
            del headers['Host']
        metadata = 'G-Method:%s\nG-Url:%s\n%s' % (method, url, ''.join('G-%s:%s\n' % (k, v) for k, v in kwargs.items() if v))
        skip_headers = self.skip_headers
        metadata += ''.join('%s:%s\n' % (k.title(), v) for k, v in headers.items() if k not in skip_headers)
        # prepare GAE request
        request_method = 'POST'
        request_headers = {}
        if common.GAE_OBFUSCATE:
            if 'rc4' in common.GAE_OPTIONS:
                request_headers['X-GOA-Options'] = 'rc4'
                cookie = base64.b64encode(rc4crypt(zlib.compress(metadata)[2:-4], kwargs.get('password'))).strip()
                body = rc4crypt(body, kwargs.get('password'))
            else:
                cookie = base64.b64encode(zlib.compress(metadata)[2:-4]).strip()
            request_headers['Cookie'] = cookie
            if body:
                request_headers['Content-Length'] = str(len(body))
            else:
                request_method = 'GET'
        else:
            metadata = zlib.compress(metadata)[2:-4]
            body = '%s%s%s' % (struct.pack('!h', len(metadata)), metadata, body)
            if 'rc4' in common.GAE_OPTIONS:
                request_headers['X-GOA-Options'] = 'rc4'
                body = rc4crypt(body, kwargs.get('password'))
            request_headers['Content-Length'] = str(len(body))
        # post data
        need_crlf = 0 if common.GAE_MODE == 'https' else 1
        need_validate = common.GAE_VALIDATE
        cache_key = '%s:%d' % (common.HOST_POSTFIX_MAP['.appspot.com'], 443 if common.GAE_MODE == 'https' else 80)
        response = self.create_http_request(request_method, self.fetchserver, request_headers, body, timeout, crlf=need_crlf, validate=need_validate, cache_key=cache_key)
        response.app_status = response.status
        response.app_options = response.getheader('X-GOA-Options', '')
        if response.status != 200:
            return response
        data = response.read(4)
        if len(data) < 4:
            response.status = 502
            response.fp = io.BytesIO(b'connection aborted. too short leadbyte data=' + data)
            response.read = response.fp.read
            return response
        response.status, headers_length = struct.unpack('!hh', data)
        data = response.read(headers_length)
        if len(data) < headers_length:
            response.status = 502
            response.fp = io.BytesIO(b'connection aborted. too short headers data=' + data)
            response.read = response.fp.read
            return response
        if 'rc4' not in response.app_options:
            response.msg = httplib.HTTPMessage(io.BytesIO(zlib.decompress(data, -zlib.MAX_WBITS)))
        else:
            response.msg = httplib.HTTPMessage(io.BytesIO(zlib.decompress(rc4crypt(data, kwargs.get('password')), -zlib.MAX_WBITS)))
            if kwargs.get('password') and response.fp:
                response.fp = CipherFileObject(response.fp, RC4Cipher(kwargs['password']))
        return response

    def __php_fetch(self, method, url, headers, body, timeout, **kwargs):
        if body:
            if len(body) < 10 * 1024 * 1024 and 'Content-Encoding' not in headers:
                zbody = zlib.compress(body)[2:-4]
                if len(zbody) < len(body):
                    body = zbody
                    headers['Content-Encoding'] = 'deflate'
            headers['Content-Length'] = str(len(body))
        skip_headers = self.skip_headers
        metadata = 'G-Method:%s\nG-Url:%s\n%s%s' % (method, url, ''.join('G-%s:%s\n' % (k, v) for k, v in kwargs.items() if v), ''.join('%s:%s\n' % (k, v) for k, v in headers.items() if k not in skip_headers))
        metadata = zlib.compress(metadata)[2:-4]
        app_body = b''.join((struct.pack('!h', len(metadata)), metadata, body))
        app_headers = {'Content-Length': len(app_body), 'Content-Type': 'application/octet-stream'}
        fetchserver = '%s?%s' % (self.fetchserver, random.random())
        crlf = 0
        cache_key = '%s//:%s' % urlparse.urlsplit(fetchserver)[:2]
        response = self.create_http_request('POST', fetchserver, app_headers, app_body, timeout, crlf=crlf, cache_key=cache_key)
        if not response:
            raise socket.error(errno.ECONNRESET, 'urlfetch %r return None' % url)
        if response.status >= 400:
            return response
        response.app_status = response.status
        need_decrypt = kwargs.get('password') and response.app_status == 200 and response.getheader('Content-Type', '') == 'image/gif' and response.fp
        if need_decrypt:
            response.fp = CipherFileObject(response.fp, XORCipher(kwargs['password'][0]))
        return response


class BaseProxyHandlerFilter(object):
    """base proxy handler filter"""
    def filter(self, handler):
        raise NotImplementedError


class SimpleProxyHandlerFilter(BaseProxyHandlerFilter):
    """simple proxy handler filter"""
    def filter(self, handler):
        if handler.command == 'CONNECT':
            return [handler.FORWARD, handler.host, handler.port, handler.connect_timeout]
        else:
            return [handler.DIRECT, {}]


class AuthFilter(BaseProxyHandlerFilter):
    """authorization filter"""
    auth_info = "Proxy authentication required"""
    white_list = set(['127.0.0.1'])

    def __init__(self, username, password):
        self.username = username
        self.password = password

    def check_auth_header(self, auth_header):
        method, _, auth_data = auth_header.partition(' ')
        if method == 'Basic':
            username, _, password = base64.b64decode(auth_data).partition(':')
            if username == self.username and password == self.password:
                return True
        return False

    def filter(self, handler):
        if self.white_list and handler.client_address[0] in self.white_list:
            return None
        auth_header = handler.headers.get('Proxy-Authorization') or getattr(handler, 'auth_header', None)
        if auth_header and self.check_auth_header(auth_header):
            handler.auth_header = auth_header
        else:
            headers = {'Access-Control-Allow-Origin': '*',
                       'Proxy-Authenticate': 'Basic realm="%s"' % self.auth_info,
                       'Content-Length': '0',
                       'Connection': 'keep-alive'}
            return [handler.MOCK, 407, headers, '']


class SimpleProxyHandler(BaseHTTPServer.BaseHTTPRequestHandler):
    """SimpleProxyHandler for GoAgent 3.x"""

    protocol_version = 'HTTP/1.1'
    ssl_version = ssl.PROTOCOL_SSLv23
    disable_transport_ssl = True
    scheme = 'http'
    skip_headers = frozenset(['Vary', 'Via', 'X-Forwarded-For', 'Proxy-Authorization', 'Proxy-Connection', 'Upgrade', 'X-Chrome-Variations', 'Connection', 'Cache-Control'])
    bufsize = 256 * 1024
    max_timeout = 16
    connect_timeout = 8
    first_run_lock = threading.Lock()
    handler_filters = [SimpleProxyHandlerFilter()]
    sticky_filter = None

    def finish(self):
        """make python2 BaseHTTPRequestHandler happy"""
        try:
            BaseHTTPServer.BaseHTTPRequestHandler.finish(self)
        except NetWorkIOError as e:
            if e[0] not in (errno.ECONNABORTED, errno.ECONNRESET, errno.EPIPE):
                raise

    def address_string(self):
        return '%s:%s' % self.client_address[:2]

    def send_response(self, code, message=None):
        if message is None:
            if code in self.responses:
                message = self.responses[code][0]
            else:
                message = ''
        if self.request_version != 'HTTP/0.9':
            self.wfile.write('%s %d %s\r\n' % (self.protocol_version, code, message))

    def send_header(self, keyword, value):
        """Send a MIME header."""
        base_send_header = BaseHTTPServer.BaseHTTPRequestHandler.send_header
        keyword = keyword.title()
        if keyword == 'Set-Cookie':
            for cookie in re.split(r', (?=[^ =]+(?:=|$))', value):
                base_send_header(self, keyword, cookie)
        elif keyword == 'Content-Disposition' and '"' not in value:
            value = re.sub(r'filename=([^"\']+)', 'filename="\\1"', value)
            base_send_header(self, keyword, value)
        else:
            base_send_header(self, keyword, value)

    def setup(self):
        if isinstance(self.__class__.first_run, collections.Callable):
            try:
                with self.__class__.first_run_lock:
                    if isinstance(self.__class__.first_run, collections.Callable):
                        self.first_run()
                        self.__class__.first_run = None
            except StandardError as e:
                logging.exception('%s.first_run() return %r', self.__class__, e)
        self.__class__.setup = BaseHTTPServer.BaseHTTPRequestHandler.setup
        self.__class__.do_CONNECT = self.__class__.do_METHOD
        self.__class__.do_GET = self.__class__.do_METHOD
        self.__class__.do_PUT = self.__class__.do_METHOD
        self.__class__.do_POST = self.__class__.do_METHOD
        self.__class__.do_HEAD = self.__class__.do_METHOD
        self.__class__.do_DELETE = self.__class__.do_METHOD
        self.__class__.do_OPTIONS = self.__class__.do_METHOD
        self.setup()

    def handle_one_request(self):
        if not self.disable_transport_ssl and self.scheme == 'http':
            leadbyte = self.connection.recv(1, socket.MSG_PEEK)
            if leadbyte in ('\x80', '\x16'):
                server_name = ''
                if leadbyte == '\x16':
                    for _ in xrange(2):
                        leaddata = self.connection.recv(1024, socket.MSG_PEEK)
                        if is_clienthello(leaddata):
                            try:
                                server_name = extract_sni_name(leaddata)
                            finally:
                                break
                try:
                    certfile = CertUtil.get_cert(server_name or 'www.google.com')
                    ssl_sock = ssl.wrap_socket(self.connection, ssl_version=self.ssl_version, keyfile=certfile, certfile=certfile, server_side=True)
                except StandardError as e:
                    if e.args[0] not in (errno.ECONNABORTED, errno.ECONNRESET):
                        logging.exception('ssl.wrap_socket(self.connection=%r) failed: %s', self.connection, e)
                    return
                self.connection = ssl_sock
                self.rfile = self.connection.makefile('rb', self.bufsize)
                self.wfile = self.connection.makefile('wb', 0)
                self.scheme = 'https'
        return BaseHTTPServer.BaseHTTPRequestHandler.handle_one_request(self)

    def first_run(self):
        pass

    def gethostbyname2(self, hostname):
        return socket.gethostbyname_ex(hostname)[-1]

    def create_tcp_connection(self, hostname, port, timeout, **kwargs):
        return socket.create_connection((hostname, port), timeout)

    def create_ssl_connection(self, hostname, port, timeout, **kwargs):
        sock = self.create_tcp_connection(hostname, port, timeout, **kwargs)
        ssl_sock = ssl.wrap_socket(sock, ssl_version=self.ssl_version)
        return ssl_sock

    def create_http_request(self, method, url, headers, body, timeout, **kwargs):
        scheme, netloc, path, query, _ = urlparse.urlsplit(url)
        if netloc.rfind(':') <= netloc.rfind(']'):
            # no port number
            host = netloc
            port = 443 if scheme == 'https' else 80
        else:
            host, _, port = netloc.rpartition(':')
            port = int(port)
        if query:
            path += '?' + query
        if 'Host' not in headers:
            headers['Host'] = host
        if body and 'Content-Length' not in headers:
            headers['Content-Length'] = str(len(body))
        ConnectionType = httplib.HTTPSConnection if scheme == 'https' else httplib.HTTPConnection
        connection = ConnectionType(netloc, timeout=timeout)
        connection.request(method, path, body=body, headers=headers)
        response = connection.getresponse(buffering=True)
        return response

    def create_http_request_withserver(self, fetchserver, method, url, headers, body, timeout, **kwargs):
        return URLFetch(fetchserver, self.create_http_request).fetch(method, url, headers, body, timeout, **kwargs)

    def handle_urlfetch_error(self, fetchserver, response):
        pass

    def handle_urlfetch_response_close(self, fetchserver, response):
        pass

    def parse_header(self):
        if self.command == 'CONNECT':
            netloc = self.path
        elif self.path[0] == '/':
            netloc = self.headers.get('Host', 'localhost')
            self.path = '%s://%s%s' % (self.scheme, netloc, self.path)
        else:
            netloc = urlparse.urlsplit(self.path).netloc
        m = re.match(r'^(.+):(\d+)$', netloc)
        if m:
            self.host = m.group(1).strip('[]')
            self.port = int(m.group(2))
        else:
            self.host = netloc
            self.port = 443 if self.scheme == 'https' else 80

    def forward_socket(self, local, remote, timeout):
        try:
            tick = 1
            bufsize = self.bufsize
            timecount = timeout
            while 1:
                timecount -= tick
                if timecount <= 0:
                    break
                (ins, _, errors) = select.select([local, remote], [], [local, remote], tick)
                if errors:
                    break
                for sock in ins:
                    data = sock.recv(bufsize)
                    if not data:
                        break
                    if sock is remote:
                        local.sendall(data)
                        timecount = timeout
                    else:
                        remote.sendall(data)
                        timecount = timeout
        except socket.timeout:
            pass
        except NetWorkIOError as e:
            if e.args[0] not in (errno.ECONNABORTED, errno.ECONNRESET, errno.ENOTCONN, errno.EPIPE):
                raise
            if e.args[0] in (errno.EBADF,):
                return
        finally:
            for sock in (remote, local):
                try:
                    sock.close()
                except StandardError:
                    pass

    def MOCK(self, status, headers, content):
        """mock response"""
        logging.info('%s "MOCK %s %s %s" %d %d', self.address_string(), self.command, self.path, self.protocol_version, status, len(content))
        headers = {k.title(): v for k, v in headers.items()}
        if 'Transfer-Encoding' in headers:
            del headers['Transfer-Encoding']
        if 'Content-Length' not in headers:
            headers['Content-Length'] = len(content)
        if 'Connection' not in headers:
            headers['Connection'] = 'close'
        self.send_response(status)
        for key, value in headers.items():
            self.send_header(key, value)
        self.end_headers()
        self.wfile.write(content)

    def STRIP(self, do_ssl_handshake=True, sticky_filter=None):
        """strip connect"""
        certfile = CertUtil.get_cert(self.host)
        logging.info('%s "STRIP %s %s:%d %s" - -', self.address_string(), self.command, self.host, self.port, self.protocol_version)
        self.send_response(200)
        self.end_headers()
        if do_ssl_handshake:
            try:
                ssl_sock = ssl.wrap_socket(self.connection, ssl_version=self.ssl_version, keyfile=certfile, certfile=certfile, server_side=True)
            except StandardError as e:
                if e.args[0] not in (errno.ECONNABORTED, errno.ECONNRESET):
                    logging.exception('ssl.wrap_socket(self.connection=%r) failed: %s', self.connection, e)
                return
            self.connection = ssl_sock
            self.rfile = self.connection.makefile('rb', self.bufsize)
            self.wfile = self.connection.makefile('wb', 0)
            self.scheme = 'https'
        try:
            self.raw_requestline = self.rfile.readline(65537)
            if len(self.raw_requestline) > 65536:
                self.requestline = ''
                self.request_version = ''
                self.command = ''
                self.send_error(414)
                return
            if not self.raw_requestline:
                self.close_connection = 1
                return
            if not self.parse_request():
                return
        except NetWorkIOError as e:
            if e.args[0] not in (errno.ECONNABORTED, errno.ECONNRESET, errno.EPIPE):
                raise
        self.sticky_filter = sticky_filter
        try:
            self.do_METHOD()
        except NetWorkIOError as e:
            if e.args[0] not in (errno.ECONNABORTED, errno.ETIMEDOUT, errno.EPIPE):
                raise

    def FORWARD(self, hostname, port, timeout, kwargs={}):
        """forward socket"""
        do_ssl_handshake = kwargs.pop('do_ssl_handshake', False)
      …