mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-01 04:38:12 +00:00
434 lines
13 KiB
Python
434 lines
13 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2016 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import os
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import re
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import uuid
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import html
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import asyncio
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import aiohttp
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import logging
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log = logging.getLogger(__name__)
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FILTERS = [
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{
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"type": "frequency_drop",
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"name": "Frequency drop",
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"description": "It will drop everything with a -1 frequency, drop every Nth packet with a positive frequency, or drop nothing",
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"parameters": [
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{
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"name": "Frequency",
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"minimum": -1,
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"maximum": 32767,
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"type": "int",
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"unit": "th packet"
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}
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]
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},
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{
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"type": "packet_loss",
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"name": "Packet loss",
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"description": "The percentage represents the chance for a packet to be lost",
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"parameters": [
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{
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"name": "Chance",
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"minimum": 0,
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"maximum": 100,
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"type": "int",
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"unit": "%"
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}
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]
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},
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{
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"type": "delay",
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"name": "Delay",
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"description": "Delay packets in milliseconds. You can add jitter in milliseconds (+/-) of the delay",
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"parameters": [
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{
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"name": "Latency",
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"minimum": 0,
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"maximum": 32767,
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"unit": "ms",
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"type": "int"
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},
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{
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"name": "Jitter (-/+)",
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"minimum": 0,
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"maximum": 32767,
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"unit": "ms",
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"type": "int"
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}
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]
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},
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{
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"type": "corrupt",
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"name": "Corrupt",
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"description": "The percentage represents the chance for a packet to be corrupted",
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"parameters": [
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{
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"name": "Chance",
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"minimum": 0,
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"maximum": 100,
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"unit": "%",
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"type": "int"
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}
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]
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},
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{
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"type": "bpf",
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"name": "Berkeley Packet Filter (BPF)",
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"description": "This filter will drop any packet matching a BPF expression. Put one expression per line",
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"parameters": [
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{
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"name": "Filters",
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"type": "text"
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}
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]
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}
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]
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class Link:
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"""
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Base class for links.
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"""
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def __init__(self, project, link_id=None):
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if link_id:
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self._id = link_id
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else:
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self._id = str(uuid.uuid4())
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self._nodes = []
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self._project = project
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self._capturing = False
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self._capture_file_name = None
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self._streaming_pcap = None
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self._created = False
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self._link_type = "ethernet"
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self._suspend = False
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self._filters = {}
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@property
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def filters(self):
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"""
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Get an array of filters
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"""
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return self._filters
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def get_active_filters(self):
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"""
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Return the active filters.
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Filters are overridden if the link is suspended.
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"""
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if self._suspend:
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return {"frequency_drop": [-1]}
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return self._filters
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@asyncio.coroutine
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def update_filters(self, filters):
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"""
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Modify the filters list.
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Filter with value 0 will be dropped because not active
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"""
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new_filters = {}
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for (filter, values) in filters.items():
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new_values = []
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for value in values:
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if isinstance(value, str):
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new_values.append(value.strip("\n "))
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else:
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new_values.append(int(value))
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values = new_values
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if len(values) != 0 and values[0] != 0 and values[0] != '':
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new_filters[filter] = values
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if new_filters != self.filters:
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self._filters = new_filters
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if self._created:
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yield from self.update()
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@asyncio.coroutine
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def update_suspend(self, value):
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if value != self._suspend:
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self._suspend = value
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yield from self.update()
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@property
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def created(self):
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"""
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:returns: True the link has been created on the computes
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"""
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return self._created
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@asyncio.coroutine
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def add_node(self, node, adapter_number, port_number, label=None, dump=True):
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"""
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Add a node to the link
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:param dump: Dump project on disk
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"""
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port = node.get_port(adapter_number, port_number)
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if port.link is not None:
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raise aiohttp.web.HTTPConflict(text="Port is already used")
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self._link_type = port.link_type
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for other_node in self._nodes:
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if other_node["node"] == node:
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raise aiohttp.web.HTTPConflict(text="Cannot connect to itself")
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if node.node_type in ["nat", "cloud"]:
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if other_node["node"].node_type in ["nat", "cloud"]:
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raise aiohttp.web.HTTPConflict(text="It's not allowed to connect a {} to a {}".format(other_node["node"].node_type, node.node_type))
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# Check if user is not connecting serial => ethernet
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other_port = other_node["node"].get_port(other_node["adapter_number"], other_node["port_number"])
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if port.link_type != other_port.link_type:
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raise aiohttp.web.HTTPConflict(text="It's not allowed to connect a {} to a {}".format(other_port.link_type, port.link_type))
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if label is None:
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label = {
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"x": -10,
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"y": -10,
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"rotation": 0,
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"text": html.escape("{}/{}".format(adapter_number, port_number)),
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"style": "font-size: 10; font-style: Verdana"
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}
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self._nodes.append({
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"node": node,
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"adapter_number": adapter_number,
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"port_number": port_number,
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"port": port,
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"label": label
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})
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if len(self._nodes) == 2:
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yield from self.create()
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for n in self._nodes:
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n["node"].add_link(self)
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n["port"].link = self
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self._created = True
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self._project.controller.notification.emit("link.created", self.__json__())
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if dump:
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self._project.dump()
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@asyncio.coroutine
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def update_nodes(self, nodes):
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for node_data in nodes:
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node = self._project.get_node(node_data["node_id"])
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for port in self._nodes:
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if port["node"] == node:
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label = node_data.get("label")
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if label:
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port["label"] = label
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self._project.controller.notification.emit("link.updated", self.__json__())
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self._project.dump()
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@asyncio.coroutine
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def create(self):
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"""
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Create the link
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"""
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raise NotImplementedError
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@asyncio.coroutine
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def update(self):
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"""
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Update a link
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"""
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raise NotImplementedError
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@asyncio.coroutine
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def delete(self):
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"""
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Delete the link
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"""
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for n in self._nodes:
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# It could be different of self if we rollback an already existing link
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if n["port"].link == self:
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n["port"].link = None
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n["node"].remove_link(self)
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@asyncio.coroutine
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def start_capture(self, data_link_type="DLT_EN10MB", capture_file_name=None):
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"""
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Start capture on the link
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:returns: Capture object
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"""
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self._capturing = True
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self._capture_file_name = capture_file_name
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self._streaming_pcap = asyncio.async(self._start_streaming_pcap())
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self._project.controller.notification.emit("link.updated", self.__json__())
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@asyncio.coroutine
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def _start_streaming_pcap(self):
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"""
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Dump a pcap file on disk
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"""
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stream_content = yield from self.read_pcap_from_source()
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with stream_content as stream:
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with open(self.capture_file_path, "wb+") as f:
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while self._capturing:
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# We read 1 bytes by 1 otherwise the remaining data is not read if the traffic stops
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data = yield from stream.read(1)
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if data:
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f.write(data)
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# Flush to disk otherwise the live is not really live
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f.flush()
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else:
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break
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@asyncio.coroutine
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def stop_capture(self):
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"""
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Stop capture on the link
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"""
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self._capturing = False
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self._project.controller.notification.emit("link.updated", self.__json__())
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@asyncio.coroutine
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def _read_pcap_from_source(self):
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"""
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Return a FileStream of the Pcap from the compute server
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"""
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raise NotImplementedError
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@asyncio.coroutine
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def node_updated(self, node):
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"""
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Called when a node member of the link is updated
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"""
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raise NotImplementedError
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def default_capture_file_name(self):
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"""
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:returns: File name for a capture on this link
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"""
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capture_file_name = "{}_{}-{}_to_{}_{}-{}".format(self._nodes[0]["node"].name,
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self._nodes[0]["adapter_number"],
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self._nodes[0]["port_number"],
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self._nodes[1]["node"].name,
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self._nodes[1]["adapter_number"],
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self._nodes[1]["port_number"])
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return re.sub("[^0-9A-Za-z_-]", "", capture_file_name) + ".pcap"
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@property
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def id(self):
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return self._id
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@property
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def nodes(self):
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return [node['node'] for node in self._nodes]
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@property
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def capturing(self):
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return self._capturing
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@property
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def capture_file_path(self):
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"""
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Get the path of the capture
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"""
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if self._capture_file_name:
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return os.path.join(self._project.captures_directory, self._capture_file_name)
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else:
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return None
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def available_filters(self):
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"""
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Return the list of filters compatible with this link
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:returns: Array of filters
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"""
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filter_node = self._get_filter_node()
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if filter_node:
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return FILTERS
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return []
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def _get_filter_node(self):
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"""
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Return the node where the filter will run
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:returns: None if no node support filtering else the node
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"""
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for node in self._nodes:
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if node["node"].node_type in ('vpcs',
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'vmware',
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'dynamips',
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'qemu',
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'iou',
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'cloud',
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'nat',
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'virtualbox',
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'docker'):
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return node["node"]
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return None
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def __eq__(self, other):
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if not isinstance(other, Link):
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return False
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return self.id == other.id
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def __hash__(self):
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return hash(self._id)
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def __json__(self, topology_dump=False):
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"""
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:param topology_dump: Filter to keep only properties require for saving on disk
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"""
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res = []
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for side in self._nodes:
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res.append({
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"node_id": side["node"].id,
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"adapter_number": side["adapter_number"],
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"port_number": side["port_number"],
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"label": side["label"]
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})
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if topology_dump:
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return {
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"nodes": res,
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"link_id": self._id,
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"filters": self._filters,
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"suspend": self._suspend
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}
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return {
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"nodes": res,
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"link_id": self._id,
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"project_id": self._project.id,
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"capturing": self._capturing,
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"capture_file_name": self._capture_file_name,
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"capture_file_path": self.capture_file_path,
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"link_type": self._link_type,
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"filters": self._filters,
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"suspend": self._suspend
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}
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