| #!/usr/bin/env python3 |
| # |
| # Copyright (c) 2019, The OpenThread Authors. |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are met: |
| # 1. Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # 2. Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # 3. Neither the name of the copyright holder nor the |
| # names of its contributors may be used to endorse or promote products |
| # derived from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| # POSSIBILITY OF SUCH DAMAGE. |
| # |
| import logging |
| from typing import Optional |
| |
| from pyshark.packet.fields import LayerField, LayerFieldsContainer |
| from pyshark.packet.layer import Layer as RawLayer |
| from pyshark.packet.packet import Packet as RawPacket |
| |
| from pktverify.layer_fields import get_layer_field, check_layer_field_exists |
| |
| |
| class Layer(object): |
| """ |
| Represents a layer of a packet. |
| """ |
| |
| def __init__(self, packet: RawPacket, layer_name: str): |
| assert isinstance(packet, RawPacket) |
| assert isinstance(layer_name, str) |
| self._packet = packet |
| self._layer_name = layer_name |
| |
| @property |
| def _layer(self) -> Optional[RawLayer]: |
| try: |
| return getattr(self._packet, self._layer_name) |
| except AttributeError: |
| return None |
| |
| @property |
| def layer_name(self) -> str: |
| """ |
| Returns the layer name. |
| """ |
| return self._layer_name |
| |
| def show(self): |
| """ |
| Print the layer information. |
| """ |
| print(self._layer) |
| |
| def has(self, name) -> bool: |
| """ |
| Returns if the layer has a given field. |
| |
| :param name: The field name. |
| """ |
| path = '%s.%s' % (self.layer_name, name) |
| return check_layer_field_exists(self._packet, path) |
| |
| def __bool__(self): |
| """ |
| Returns if this layer exists in the packet. |
| """ |
| layer_exists = hasattr(self._packet, self._layer_name) |
| return layer_exists |
| |
| def __getattr__(self, name): |
| """ |
| Returns the layer field or container of a given field name. |
| |
| :param name: The name of layer field or container. |
| """ |
| path = '%s.%s' % (self.layer_name, name) |
| v = get_layer_field(self._packet, path) |
| assert not isinstance(v, (LayerField, LayerFieldsContainer)), '%s = %s(%r)' % (path, v.__class__.__name__, v) |
| setattr(self, name, v) |
| return v |
| |
| def _add_field(self, key: str, val: str): |
| logging.debug("layer %s add field: %s = %s", self.layer_name, key, val) |
| field = LayerField(name=key, value=val) |
| all_fields = self._layer._all_fields |
| if key not in all_fields: |
| all_fields[key] = LayerFieldsContainer(main_field=field) |
| else: |
| all_fields[key].fields.append(field) |
| |
| |
| class ThreadMeshcopLayer(Layer): |
| """ |
| Represents the Thread MeshCop layer of a packet. |
| """ |
| |
| def __bool__(self): |
| raise NotImplementedError("thread_meshcop is not a real layer, please do not check as bool") |
| |
| |
| class ThreadNetworkDataLayer(Layer): |
| """ |
| Represents the Thread NetworkData layer of a packet. |
| """ |
| |
| def __bool__(self): |
| raise NotImplementedError("thread_nwd is not a real layer, please do not check as bool") |
| |
| |
| class Icmpv6Layer(Layer): |
| """ |
| Represents the ICMPv6 layer of a packet. |
| """ |
| |
| @property |
| def is_ping(self) -> bool: |
| """ |
| Returns if the ICMPv6 layer is a Ping Request or Reply. |
| """ |
| return self.type in (128, 129) |
| |
| @property |
| def is_ping_request(self) -> bool: |
| """ |
| Returns if the ICMPv6 layer is a Ping Request. |
| """ |
| return self.type == 128 |
| |
| @property |
| def is_ping_reply(self) -> bool: |
| """ |
| Returns if the ICMPv6 layer is a Ping Reply. |
| """ |
| return self.type == 129 |
| |
| @property |
| def is_neighbor_advertisement(self) -> bool: |
| """ |
| Returns if the ICMPv6 layer is a Neighbor Advertisement. |
| """ |
| return self.type == 136 |
| |
| @property |
| def is_neighbor_solicitation(self) -> bool: |
| """ |
| Returns if the ICMPv6 layer is a Neighbor Solicitation. |
| """ |
| return self.type == 135 |
| |
| @property |
| def is_router_advertisement(self) -> bool: |
| """ |
| Returns if the ICMPv6 layer is a Router Advertisement. |
| """ |
| return self.type == 134 |
| |
| |
| class WpanLayer(Layer): |
| """ |
| Represents the WPAN layer of a packet. |
| """ |
| |
| @property |
| def is_ack(self) -> bool: |
| return self.frame_type == 0x2 |
| |
| |
| class DnsLayer(Layer): |
| """ |
| Represents the DNS layer of a packet. |
| """ |
| pass |