/assets/goagent.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>

__version__ = '3.1.5'

import sys
import os
import glob

# GAEProxy Patch
# The sys path in Android is set up outside.

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 binascii
import time
import struct
import collections
import zlib
import functools
import itertools
import re
import io
import fnmatch
import traceback
import random
import subprocess
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 pacparser
except ImportError:
    pacparser = None

# GAEProxy Patch
class NullDevice():
    def write(self, s):
        pass

sys.stdout = NullDevice()
sys.stderr = sys.stdout

class DNSCacheUtil(object):
    '''DNSCache module, integrated with GAEProxy'''

    cache = {"127.0.0.1": 'localhost'}

    @staticmethod
    def getHost(address):

        p = "(?:\d{1,3}\.){3}\d{1,3}"

        if re.match(p, address) is None:
            return

        if address in DNSCacheUtil.cache:
            return DNSCacheUtil.cache[address]

        host = None

        sock = None
        address_family = socket.AF_INET
        retry = 0
        while address not in DNSCacheUtil.cache:
            try:
                sock = socket.socket(family=address_family, type=socket.SOCK_STREAM)
                sock.settimeout(2)
                sock.connect(("127.0.0.1", 9090))
                sock.sendall(address + "\r\n")
                host = sock.recv(512)
                if host is not None and not host.startswith("null"):
                    host = host.strip()
                    DNSCacheUtil.cache[address] = host
                    break
                else:
                    if retry > 3:
                        host = None
                        break
                    else:
                        retry = retry + 1
                        continue
            except socket.error as e:
                if e[0] in (10060, 'timed out'):
                    continue
            except Exception, e:
                logging.error('reverse dns query exception: %s', e)
                break
            finally:
                if sock:
                    sock.close()

        return host

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
        #GAEProxy Patch

    @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.log('DEBUG', fmt, *args, **kwargs)

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

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

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

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

    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.log('CRITICAL', fmt, *args, **kwargs)
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 _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:
            remove = self.key_order[self.max_items]
            del self.cache[remove]
            self.key_order.pop(self.max_items)

    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]
        # GAEProxy Patch
        req.add_extensions([OpenSSL.crypto.X509Extension(b'subjectAltName', True, ', '.join('DNS: %s' % x for x in sans))])
        req.set_pubkey(pkey)
        req.sign(pkey, 'sha1')

        cert = OpenSSL.crypto.X509()
        # GAEProxy Patch
        cert.set_version(3)
        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]
        # GAEProxy Patch
        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=()):
        # GAEProxy Patch
        sans = ["*.akamaihd.net","*.fbcdn.net","*.google.com","*.appspot.com","*.googleapis.com","*.googlevideo.com","*.twitter.com","*.facebook.com","*.whatsapp.net"]
        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]
        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')
            except Exception as e:
                logging.error('load_certificate(certfile=%r) failed:%s', certfile, e)
        # GAEProxy Patch
        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 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():
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        sock.connect(('8.8.8.8', 53))
        listen_ip = sock.getsockname()[0]
        sock.close()
        return listen_ip

# GAEProxy Patch
# No PAC

def dns_remote_resolve(qname, dnsservers, blacklist, timeout):
    """
    http://gfwrev.blogspot.com/2009/11/gfwdns.html
    http://zh.wikipedia.org/wiki/域名服务器缓存污染
    http://support.microsoft.com/kb/241352
    """
    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(2):
            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, _ = sock.recvfrom(512)
                        reply = dnslib.DNSRecord.parse(reply_data)
                        rtypes = (1, 28) if sock is sock_v6 else (1,)
                        iplist = [str(x.rdata) for x in reply.rr if x.rtype in rtypes]
                        if any(x in blacklist for x in iplist):
                            logging.warning('query qname=%r reply bad iplist=%r', qname, iplist)
                        else:
                            logging.debug('query qname=%r reply iplist=%s', qname, iplist)
                            return iplist
            except socket.error as e:
                logging.warning('handle dns query=%s socket: %r', query, e)
    finally:
        for sock in socks:
            sock.close()


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)


class HTTPUtil(object):
    """HTTP Request Class"""

    MessageClass = dict
    protocol_version = 'HTTP/1.1'
    skip_headers = frozenset(['Vary', 'Via', 'X-Forwarded-For', 'Proxy-Authorization', 'Proxy-Connection', 'Upgrade', 'X-Chrome-Variations', 'Connection', 'Cache-Control'])
    ssl_validate = False
    ssl_obfuscate = False
    ssl_ciphers = ':'.join(['ECDHE-ECDSA-AES256-SHA',
                            'ECDHE-RSA-AES256-SHA',
                            'DHE-RSA-CAMELLIA256-SHA',
                            'DHE-DSS-CAMELLIA256-SHA',
                            'DHE-RSA-AES256-SHA',
                            'DHE-DSS-AES256-SHA',
                            'ECDH-RSA-AES256-SHA',
                            'ECDH-ECDSA-AES256-SHA',
                            'CAMELLIA256-SHA',
                            'AES256-SHA',
                            'ECDHE-ECDSA-RC4-SHA',
                            'ECDHE-ECDSA-AES128-SHA',
                            'ECDHE-RSA-RC4-SHA',
                            'ECDHE-RSA-AES128-SHA',
                            'DHE-RSA-CAMELLIA128-SHA',
                            'DHE-DSS-CAMELLIA128-SHA',
                            'DHE-RSA-AES128-SHA',
                            'DHE-DSS-AES128-SHA',
                            'ECDH-RSA-RC4-SHA',
                            'ECDH-RSA-AES128-SHA',
                            'ECDH-ECDSA-RC4-SHA',
                            'ECDH-ECDSA-AES128-SHA',
                            'SEED-SHA',
                            'CAMELLIA128-SHA',
                            'RC4-SHA',
                            'RC4-MD5',
                            'AES128-SHA',
                            'ECDHE-ECDSA-DES-CBC3-SHA',
                            'ECDHE-RSA-DES-CBC3-SHA',
                            'EDH-RSA-DES-CBC3-SHA',
                            'EDH-DSS-DES-CBC3-SHA',
                            'ECDH-RSA-DES-CBC3-SHA',
                            'ECDH-ECDSA-DES-CBC3-SHA',
                            'DES-CBC3-SHA',
                            'TLS_EMPTY_RENEGOTIATION_INFO_SCSV'])

    def __init__(self, max_window=4, max_timeout=8, max_retry=4, proxy='', dns_servers=[], dns_blacklist=set()):
        # http://docs.python.org/dev/library/ssl.html
        # http://blog.ivanristic.com/2009/07/examples-of-the-information-collected-from-ssl-handshakes.html
        # http://src.chromium.org/svn/trunk/src/net/third_party/nss/ssl/sslenum.c
        # http://www.openssl.org/docs/apps/ciphers.html
        # openssl s_server -accept 443 -key CA.crt -cert CA.crt
        # set_ciphers as Modern Browsers
        self.max_window = max_window
        self.max_retry = max_retry
        self.max_timeout = max_timeout
        self.tcp_connection_time = collections.defaultdict(float)
        self.tcp_connection_cache = collections.defaultdict(Queue.PriorityQueue)
        self.ssl_connection_time = collections.defaultdict(float)
        self.ssl_connection_cache = collections.defaultdict(Queue.PriorityQueue)
        self.dns = {}
        self.proxy = proxy
        self.openssl_context = None
        if self.proxy:
            self.dns_resolve = self.__dns_resolve_withproxy
            self.create_connection = self.__create_connection_withproxy
            self.create_ssl_connection = self.__create_ssl_connection_withproxy
        self.dns_servers = dns_servers
        self.dns_blacklist = dns_blacklist

    def set_openssl_option(self, validate=True, obfuscate=True):
        if self.openssl_context is None:
            self.openssl_context = OpenSSL.SSL.Context(OpenSSL.SSL.TLSv1_METHOD)
            self.openssl_context.set_session_id(binascii.b2a_hex(os.urandom(10)))
            if hasattr(OpenSSL.SSL, 'SESS_CACHE_BOTH'):
                self.openssl_context.set_session_cache_mode(OpenSSL.SSL.SESS_CACHE_BOTH)
        if validate:
            self.openssl_context.load_verify_locations(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'cacert.pem'))
            self.openssl_context.set_verify(OpenSSL.SSL.VERIFY_PEER, lambda c, x, e, d, ok: ok)
        if obfuscate:
            ssl_ciphers = ':'.join(x for x in self.ssl_ciphers.split(':') if random.random() > 0.5)
            self.openssl_context.set_cipher_list(ssl_ciphers)

    def dns_resolve(self, host, dnsservers=[], ipv4_only=True):
        iplist = self.dns.get(host)
        if not iplist:
            if not dnsservers:
                iplist = list(set(socket.gethostbyname_ex(host)[-1]) - self.dns_blacklist)
            else:
                iplist = dns_remote_resolve(host, dnsservers, self.dns_blacklist, timeout=2)
            if not iplist:
                iplist = dns_remote_resolve(host, self.dns_servers, self.dns_blacklist, timeout=2)
            if ipv4_only:
                iplist = [ip for ip in iplist if re.match(r'\d+\.\d+\.\d+\.\d+', ip)]
            self.dns[host] = iplist = list(set(iplist))
        return iplist

    def __dns_resolve_withproxy(self, host, dnsservers=[], ipv4_only=True):
        return [host]

    def create_connection(self, address, timeout=None, source_address=None, **kwargs):
        connection_cache_key = kwargs.get('cache_key')
        def _create_connection(ipaddr, timeout, queobj):
            sock = None
            try:
                # create a ipv4/ipv6 socket object
                sock = socket.socket(socket.AF_INET if ':' not in ipaddr[0] else socket.AF_INET6)
                # set reuseaddr option to avoid 10048 socket error
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                # resize socket recv buffer 8K->32K to improve browser releated application performance
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 32*1024)
                # disable nagle algorithm to send http request quickly.
                sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, True)
                # set a short timeout to trigger timeout retry more quickly.
                sock.settimeout(timeout or self.max_timeout)
                # start connection time record
                start_time = time.time()
                # TCP connect
                sock.connect(ipaddr)
                # record TCP connection time
                self.tcp_connection_time[ipaddr] = time.time() - start_time
                # put ssl socket object to output queobj
                queobj.put(sock)
            except (socket.error, OSError) as e:
                # any socket.error, put Excpetions to output queobj.
                queobj.put(e)
                # reset a large and random timeout to the ipaddr
                self.tcp_connection_time[ipaddr] = self.max_timeout+random.random()
                # close tcp socket
                if sock:
                    sock.close()
        def _close_connection(count, queobj):
            for i in range(count):
                sock = queobj.get()
                if sock and not isinstance(sock, Exception):
                    if connection_cache_key and i == 0:
                        self.tcp_connection_cache[connection_cache_key].put((time.time(), sock))
                    else:
                        sock.close()
        try:
            while connection_cache_key:
                ctime, sock = self.tcp_connection_cache[connection_cache_key].get_nowait()
                if time.time() - ctime < 30:
                    return sock
        except Queue.Empty:
            pass
        host, port = address
        result = None
        addresses = [(x, port) for x in self.dns_resolve(host)]
        if port == 443:
            get_connection_time = lambda addr: self.ssl_connection_time.__getitem__(addr) or self.tcp_connection_time.__getitem__(addr)
        else:
            get_connection_time = self.tcp_connection_time.__getitem__
        for i in range(self.max_retry):
            window = min((self.max_window+1)//2 + min(i, 1), len(addresses))
            addresses.sort(key=get_connection_time)
            addrs = addresses[:window] + random.sample(addresses, min(len(addresses), window, self.max_window-window))
            queobj = Queue.Queue()
            for addr in addrs:
                thread.start_new_thread(_create_connection, (addr, timeout, queobj))
            for i in range(len(addrs)):
                result = queobj.get()
                if not isinstance(result, (socket.error, OSError)):
                    thread.start_new_thread(_close_connection, (len(addrs)-i-1, queobj))
                    return result
                else:
                    if i == 0:
                        # only output first error
                        logging.warning('create_connection to %s return %r, try again.', addrs, result)

    def create_ssl_connection(self, address, timeout=None, source_address=None, **kwargs):
        connection_cache_key = kwargs.get('cache_key')
        validate = kwargs.get('validate')
        def _create_ssl_connection(ipaddr, timeout, queobj):
            sock = None
            ssl_sock = None
            try:
                # create a ipv4/ipv6 socket object
                sock = socket.socket(socket.AF_INET if ':' not in ipaddr[0] else socket.AF_INET6)
                # set reuseaddr option to avoid 10048 socket error
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                # resize socket recv buffer 8K->32K to improve browser releated application performance
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 32*1024)
                # disable negal algorithm to send http request quickly.
                sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, True)
                # set a short timeout to trigger timeout retry more quickly.
                sock.settimeout(timeout or self.max_timeout)
                # pick up the certificate
                if not validate:
                    ssl_sock = ssl.wrap_socket(sock, do_handshake_on_connect=False)
                else:
                    ssl_sock = ssl.wrap_socket(sock, cert_reqs=ssl.CERT_REQUIRED, ca_certs=os.path.join(os.path.dirname(os.path.abspath(__file__)),'cacert.pem'), do_handshake_on_connect=False)
                ssl_sock.settimeout(timeout or self.max_timeout)
                # start connection time record
                start_time = time.time()
                # TCP connect
                ssl_sock.connect(ipaddr)
                connected_time = time.time()
                # SSL handshake
                ssl_sock.do_handshake()
                handshaked_time = time.time()
                # record TCP connection time
                self.tcp_connection_time[ipaddr] = ssl_sock.tcp_time = connected_time - start_time
                # record SSL connection time
                self.ssl_connection_time[ipaddr] = ssl_sock.ssl_time = handshaked_time - start_time
                ssl_sock.ssl_time = connected_time - start_time
                # sometimes, we want to use raw tcp socket directly(select/epoll), so setattr it to ssl socket.
                ssl_sock.sock = sock
                # verify SSL certificate.
                if validate and address[0].endswith('.appspot.com'):
                    cert = ssl_sock.getpeercert()
                    orgname = next((v for ((k, v),) in cert['subject'] if k == 'organizationName'))
                    if not orgname.lower().startswith('google '):
                        raise ssl.SSLError("%r certificate organizationName(%r) not startswith 'Google'" % (address[0], orgname))
                # put ssl socket object to output queobj
                queobj.put(ssl_sock)
            except (socket.error, ssl.SSLError, OSError) as e:
                # any socket.error, put Excpetions to output queobj.
                queobj.put(e)
                # reset a large and random timeout to the ipaddr
                self.ssl_connection_time[ipaddr] = self.max_timeout + random.random()
                # close ssl socket
                if ssl_sock:
                    ssl_sock.close()
                # close tcp socket
                if sock:
                    sock.close()
        def _create_openssl_connection(ipaddr, timeout, queobj):
            sock = None
            ssl_sock = None
            try:
                # create a ipv4/ipv6 socket object
                sock = socket.socket(socket.AF_INET if ':' not in ipaddr[0] else socket.AF_INET6)
                # set reuseaddr option to avoid 10048 socket error
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                # resize socket recv buffer 8K->32K to improve browser releated application performance
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 32*1024)
                # disable negal algorithm to send http request quickly.
                sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, True)
                # set a short timeout to trigger timeout retry more quickly.
                sock.settimeout(timeout or self.max_timeout)
                # pick up the certificate
                server_hostname = b'www.google.com' if address[0].endswith('.appspot.com') else None
                ssl_sock = SSLConnection(self.openssl_context, sock)
                ssl_sock.set_connect_state()
                if server_hostname:
                    ssl_sock.set_tlsext_host_name(server_hostname)
                # start connection time record
                start_time = time.time()
                # TCP connect
                ssl_sock.connect(ipaddr)
                connected_time = time.time()
                # SSL handshake
                ssl_sock.do_handshake()
                handshaked_time = time.time()
                # record TCP connection time
                self.tcp_connection_time[ipaddr] = ssl_sock.tcp_time = connected_time - start_time
                # record SSL connection time
                self.ssl_connection_time[ipaddr] = ssl_sock.ssl_time = handshaked_time - start_time
                # sometimes, we want to use raw tcp socket directly(select/epoll), so setattr it to ssl socket.
                ssl_sock.sock = sock
                # verify SSL certificate.
                if validate and address[0].endswith('.appspot.com'):
                    cert = ssl_sock.get_peer_certificate()
                    commonname = next((v for k, v in cert.get_subject().get_components() if k == 'CN'))
                    if '.google' not in commonname and not commonname.endswith('.appspot.com'):
                        raise socket.error("Host name '%s' doesn't match certificate host '%s'" % (address[0], commonname))
                # put ssl socket object to output queobj
                queobj.put(ssl_sock)
            except (socket.error, OpenSSL.SSL.Error, OSError) as e:
                # any socket.error, put Excpetions to output queobj.
                queobj.put(e)
                # reset a large and random timeout to the ipaddr
                self.ssl_connection_time[ipaddr] = self.max_timeout + random.random()
                # close ssl socket
                if ssl_sock:
                    ssl_sock.close()
                # close tcp socket
                if sock:
                    sock.close()
        def _close_ssl_connection(count, queobj, first_tcp_time, first_ssl_time):
            for i in range(count):
                sock = queobj.get()
                ssl_time_threshold = min(1, 1.5 * first_ssl_time)
                if sock and not isinstance(sock, Exception):
                    if connection_cache_key and sock.ssl_time < ssl_time_threshold:
                        self.ssl_connection_cache[connection_cache_key].put((time.time(), sock))
                    else:
                        sock.close()
        try:
            while connection_cache_key:
                ctime, sock = self.ssl_connection_cache[connection_cache_key].get_nowait()
                if time.time() - ctime < 30:
                    return sock
        except Queue.Empty:
            pass
        host, port = address
        result = None
        # create_connection = _create_ssl_connection if not validate else _create_openssl_connection
        create_connection = _create_ssl_connection
        addresses = [(x, port) for x in self.dns_resolve(host)]
        for i in range(self.max_retry):
            window = min((self.max_window+1)//2 + min(i, 1), len(addresses))
            addresses.sort(key=self.ssl_connection_time.__getitem__)
            addrs = addresses[:window] + random.sample(addresses, min(len(addresses), window, self.max_window-window))
            queobj = Queue.Queue()
            for addr in addrs:
                thread.start_new_thread(create_connection, (addr, timeout, queobj))
            for i in range(len(addrs)):
                result = queobj.get()
                if not isinstance(result, Exception):
                    thread.start_new_thread(_close_ssl_connection, (len(addrs)-i-1, queobj, result.tcp_time, result.ssl_time))
                    return result
                else:
                    if i == 0:
                        # only output first error
                        logging.warning('create_ssl_connection to %s return %r, try again.', addrs, result)

    def __create_connection_withproxy(self, address, timeout=None, source_address=None, **kwargs):
        host, port = address
        logging.debug('__create_connection_withproxy connect (%r, %r)', host, port)
        _, proxyuser, proxypass, proxyaddress = ProxyUtil.parse_proxy(self.proxy)
        try:
            try:
                self.dns_resolve(host)
            except (socket.error, OSError):
                pass
            proxyhost, _, proxyport = proxyaddress.rpartition(':')
            sock = socket.create_connection((proxyhost, int(proxyport)))
            if host in self.dns:
                hostname = random.choice(self.dns[host])
            elif host.endswith('.appspot.com'):
                hostname = 'www.google.com'
            else:
                hostname = host
            request_data = 'CONNECT %s:%s HTTP/1.1\r\n' % (hostname, port)
            if proxyuser and proxypass:
                request_data += 'Proxy-authorization: Basic %s\r\n' % base64.b64encode(('%s:%s' % (proxyuser, proxypass)).encode()).decode().strip()
            request_data += '\r\n'
            sock.sendall(request_data)
            response = httplib.HTTPResponse(sock)
            response.begin()
            if response.status >= 400:
                logging.error('__create_connection_withproxy return http error code %s', response.status)
                sock = None
            return sock
        except Exception as e:
            logging.error('__create_connection_withproxy error %s', e)
            raise

    def __create_ssl_connection_withproxy(self, address, timeout=None, source_address=None, **kwargs):
        host, port = address
        logging.debug('__create_ssl_connection_withproxy connect (%r, %r)', host, port)
        try:
            sock = self.__create_connection_withproxy(address, timeout, source_address)
            ssl_sock = ssl.wrap_socket(sock)
            ssl_sock.sock = sock
            return ssl_sock
        except Exception as e:
            logging.error('__create_ssl_connection_withproxy error %s', e)
            raise

    def forward_socket(self, local, remote, timeout=60, tick=2, bufsize=8192, maxping=None, maxpong=None):
        try:
            timecount = timeout
            while 1:
                timecount -= tick
                if timecount <= 0:
                    break
                (ins, _, errors) = select.select([local, remote], [], [local, remote], tick)
                if errors:
                    break
                if ins:
                    for sock in ins:
                        data = sock.recv(bufsize)
                        if data:
                            if sock is remote:
                                local.sendall(data)
                                timecount = maxpong or timeout
                            else:
                                remote.sendall(data)
                                timecount = maxping or timeout
                        else:
                            return
        except NetWorkIOError as e:
            if e.args[0] not in (errno.ECONNABORTED, errno.ECONNRESET, errno.ENOTCONN, errno.EPIPE):
                raise
        finally:
            if local:
                local.close()
            if remote:
                remote.close()

    def green_forward_socket(self, local, remote, timeout=60, tick=2, bufsize=8192, maxping=None, maxpong=None, pongcallback=None, bitmask=None):
        def io_copy(dest, source):
            try:
                dest.settimeout(timeout)
                source.settimeout(timeout)
                while 1:
                    data = source.recv(bufsize)
                    if not data:
                        break
                    if bitmask:
                        data = ''.join(chr(ord(x) ^ bitmask) for x in data)
                    dest.sendall(data)
            except NetWorkIOError as e:
                if e.args[0] not in ('timed out', errno.ECONNABORTED, errno.ECONNRESET, errno.EBADF, errno.EPIPE, errno.ENOTCONN, errno.ETIMEDOUT):
                    raise
            finally:
                if local:
                    local.close()
                if remote:
                    remote.close()
        thread.start_new_thread(io_copy, (remote.dup(), local.dup()))
        io_copy(local, remote)

    def _request(self, sock, method, path, protocol_version, headers, payload, bufsize=8192, crlf=None, return_sock=None):
        skip_headers = self.skip_headers
        need_crlf = bool(crlf)
        if need_crlf:
            fakehost = 'www.' + ''.join(random.choice(('bcdfghjklmnpqrstvwxyz','aeiou')[x&1]) for x in xrange(random.randint(5,20))) + random.choice(['.net', '.com', '.org'])
            request_data = 'GET / HTTP/1.1\r\nHost: %s\r\n\r\n\r\n\r\r' % fakehost
        else:
            request_data = ''
        request_data += '%s %s %s\r\n' % (method, path, protocol_version)
        request_data += ''.join('%s: %s\r\n' % (k.title(), v) for k, v in headers.items() if k.title() not in skip_headers)
        if self.proxy:
            _, username, password, _ = ProxyUtil.parse_proxy(self.proxy)
            if username and password:
                request_data += 'Proxy-Authorization: Basic %s\r\n' % base64.b64encode(('%s:%s' % (username, password)).encode()).decode().strip()
        request_data += '\r\n'

        if isinstance(payload, bytes):
            sock.sendall(request_data.encode() + payload)
        elif hasattr(payload, 'read'):
            sock.sendall(request_data)
            while 1:
                data = payload.read(bufsize)
                if not data:
                    break
                sock.sendall(data)
        else:
            raise TypeError('http_util.request(payload) must be a string or buffer, not %r' % type(payload))

        if need_crlf:
            try:
                response = httplib.HTTPResponse(sock)
                response.begin()
                response.read()
            except Exception:
                logging.exception('crlf skip read')
                return None

        if return_sock:
            return sock

        response = httplib.HTTPResponse(sock, buffering=True)
        try:
            response.begin()
        except httplib.BadStatusLine:
            response = None
        return response

    def request(self, method, url, payload=None, headers={}, realhost='', bufsize=8192, crlf=None, validate=None, return_sock=None, connection_cache_key=None):
        scheme, netloc, path, _, query, _ = urlparse.urlparse(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 payload and 'Content-Length' not in headers:
            headers['Content-Length'] = str(len(payload))

        for i in range(self.max_retry):
            sock = None
            ssl_sock = None
            try:
                if scheme == 'https':
                    ssl_sock = self.create_ssl_connection((realhost or host, port), self.max_timeout, validate=validate, cache_key=connection_cache_key)
                    if ssl_sock:
                        sock = ssl_sock.sock
                        del ssl_sock.sock
                    else:
                        raise socket.error('timed out', 'create_ssl_connection(%r,%r)' % (realhost or host, port))
                else:
                    sock = self.create_connection((realhost or host, port), self.max_timeout, cache_key=connection_cache_key)
                if sock:
                    if scheme == 'https':
                        crlf = 0
                    return self._request(ssl_sock or sock, method, path, self.protocol_version, headers, payload, bufsize=bufsize, crlf=crlf, return_sock=return_sock)
            except Exception as e:
                logging.debug('request "%s %s" failed:%s', method, url, e)
                if ssl_sock:
                    ssl_sock.close()
                if sock:
                    sock.close()
                if i == self.max_retry - 1:
                    raise
                else:
                    continue


class Common(object):
    """Global Config Object"""

    ENV_CONFIG_PREFIX = 'GOAGENT_'

    def __init__(self):
        """load config from proxy.ini"""
        ConfigParser.RawConfigParser.OPTCRE = re.compile(r'(?P<option>[^=\s][^=]*)\s*(?P<vi>[=])\s*(?P<value>.*)$')
        self.CONFIG = ConfigParser.ConfigParser()
        # GAEProxy Patch
        self.CONFIG_FILENAME = '/data/data/org.gaeproxy/proxy.ini'
        self.CONFIG.read(self.CONFIG_FILENAME)

        self.LISTEN_IP = self.CONFIG.get('listen', 'ip')
        self.LISTEN_PORT = self.CONFIG.getint('listen', 'port')
        self.LISTEN_VISIBLE = self.CONFIG.getint('listen', 'visible')
        self.LISTEN_DEBUGINFO = self.CONFIG.getint('listen', 'debuginfo')

        self.GAE_APPIDS = re.findall(r'[\w\-\.]+', self.CONFIG.get('gae', 'appid').replace('.appspot.com', ''))
        self.GAE_PASSWORD = self.CONFIG.get('gae', 'password').strip()
        self.GAE_PATH = self.CONFIG.get('gae', 'path')
        self.GAE_MODE = self.CONFIG.get('gae', 'mode')
        self.GAE_PROFILE = self.CONFIG.get('gae', 'profile').strip()
        self.GAE_WINDOW = self.CONFIG.getint('gae', 'window')
        self.GAE_VALIDATE = self.CONFIG.getint('gae', 'validate')
        self.GAE_OBFUSCATE = self.CONFIG.getint('gae', 'obfuscate')
        self.GAE_OPTIONS = self.CONFIG.get('gae', 'options')

        hosts_section, http_section = '%s/hosts' % self.GAE_PROFILE, '%s/http' % self.GAE_PROFILE
        self.HOSTS_MAP = collections.OrderedDict((k, v or k) for k, v in self.CONFIG.items(hosts_section) if '\\' not in k and ':' not in k and not k.startswith('.'))
        self.HOSTS_POSTFIX_MAP = collections.OrderedDict((k, v) for k, v in self.CONFIG.items(hosts_section) if '\\' not in k and ':' not in k and k.startswith('.'))
        self.HOSTS_POSTFIX_ENDSWITH = tuple(self.HOSTS_POSTFIX_MAP)

        self.CONNECT_HOSTS_MAP = collections.OrderedDict((k, v) for k, v in self.CONFIG.items(hosts_section) if ':' in k and not k.startswith('.'))
        self.CONNECT_POSTFIX_MAP = collections.OrderedDict((k, v) for k, v in self.CONFIG.items(hosts_section) if ':' in k and k.startswith('.'))
        self.CONNECT_POSTFIX_ENDSWITH = tuple(self.CONNECT_POSTFIX_MAP)

        self.METHOD_REMATCH_MAP = collections.OrderedDict((re.compile(k).match, v) for k, v in self.CONFIG.items(hosts_section) if '\\' in k)
        self.METHOD_REMATCH_HAS_LOCALFILE = any(x.startswith('file://') for x in self.METHOD_REMATCH_MAP.values())

        self.HTTP_WITHGAE = tuple(self.CONFIG.get(http_section, 'withgae').split('|'))
        self.HTTP_CRLFSITES = tuple(self.CONFIG.get(http_section, 'crlfsites').split('|'))
        self.HTTP_FORCEHTTPS = set(self.CONFIG.get(http_section, 'forcehttps').split('|'))
        self.HTTP_FAKEHTTPS = set(self.CONFIG.get(http_section, 'fakehttps').split('|'))
        self.HTTP_DNS = self.CONFIG.get(http_section, 'dns').split('|') if self.CONFIG.has_o…