abuf.py 文件源码

def _do_query(cls, buf, offset, error):
        qry = {}
        res = cls._do_name(buf, offset, 0, error)
        if res is None:
            e = ("_do_query", offset, "_do_name failed")
            error.append(e)
            return None
        offset, name = res
        qry['Qname'] = name

        fmt = "!HH"
        reqlen = struct.calcsize(fmt)
        strng = buf[offset:offset + reqlen]
        if len(strng) != reqlen:
            e = ("_do_query", offset, 'offset out of range: buf size = %d' % len(buf))
            error.append(e)
            return None
        res = struct.unpack(fmt, strng)
        qry['Qtype'] = cls._type_to_text(res[0])
        qry['Qclass'] = cls._class_to_text(res[1])

        return offset + reqlen, qry