| :: # Copyright 2013, Big Switch Networks, Inc. |
| :: # |
| :: # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with |
| :: # the following special exception: |
| :: # |
| :: # LOXI Exception |
| :: # |
| :: # As a special exception to the terms of the EPL, you may distribute libraries |
| :: # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided |
| :: # that copyright and licensing notices generated by LoxiGen are not altered or removed |
| :: # from the LoxiGen Libraries and the notice provided below is (i) included in |
| :: # the LoxiGen Libraries, if distributed in source code form and (ii) included in any |
| :: # documentation for the LoxiGen Libraries, if distributed in binary form. |
| :: # |
| :: # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler." |
| :: # |
| :: # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain |
| :: # a copy of the EPL at: |
| :: # |
| :: # http://www.eclipse.org/legal/epl-v10.html |
| :: # |
| :: # Unless required by applicable law or agreed to in writing, software |
| :: # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| :: # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| :: # EPL for the specific language governing permissions and limitations |
| :: # under the EPL. |
| :: |
| def parse_header(buf): |
| if len(buf) < 8: |
| raise loxi.ProtocolError("too short to be an OpenFlow message") |
| return struct.unpack_from("!BBHL", buf) |
| |
| def parse_message(buf): |
| msg_ver, msg_type, msg_len, msg_xid = parse_header(buf) |
| if msg_ver != ofp.OFP_VERSION and msg_type != ofp.OFPT_HELLO: |
| raise loxi.ProtocolError("wrong OpenFlow version (expected %d, got %d)" % (ofp.OFP_VERSION, msg_ver)) |
| if len(buf) != msg_len: |
| raise loxi.ProtocolError("incorrect message size") |
| return message.unpack(loxi.generic_util.OFReader(buf)) |