def proxy_bypass_macosx_sysconf(host):
        """
        Return True iff this host shouldn't be accessed using a proxy

        This function uses the MacOSX framework SystemConfiguration
        to fetch the proxy information.
        """
        import re
        import socket
        from fnmatch import fnmatch

        hostonly, port = splitport(host)

        def ip2num(ipAddr):
            parts = ipAddr.split('.')
            parts = map(int, parts)
            if len(parts) != 4:
                parts = (parts + [0, 0, 0, 0])[:4]
            return (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3]

        proxy_settings = _get_proxy_settings()

        # Check for simple host names:
        if '.' not in host:
            if proxy_settings['exclude_simple']:
                return True

        hostIP = None

        for value in proxy_settings.get('exceptions', ()):
            # Items in the list are strings like these: *.local, 169.254/16
            if not value: continue

            m = re.match(r"(\d+(?:\.\d+)*)(/\d+)?", value)
            if m is not None:
                if hostIP is None:
                    try:
                        hostIP = socket.gethostbyname(hostonly)
                        hostIP = ip2num(hostIP)
                    except socket.error:
                        continue

                base = ip2num(m.group(1))
                mask = m.group(2)
                if mask is None:
                    mask = 8 * (m.group(1).count('.') + 1)

                else:
                    mask = int(mask[1:])
                mask = 32 - mask

                if (hostIP >> mask) == (base >> mask):
                    return True

            elif fnmatch(host, value):
                return True

        return False
dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/urllib.py/proxy_bypass_macosx_sysconf/original