mirror of
https://github.com/GNS3/gns3-server
synced 2024-10-10 18:08:55 +00:00
150 lines
4.2 KiB
Python
150 lines
4.2 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 asyncio
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import logging
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log = logging.getLogger(__name__)
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class Link:
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def __init__(self, project):
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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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@asyncio.coroutine
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def add_node(self, node, adapter_number, port_number):
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"""
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Add a node to the link
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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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})
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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 delete(self):
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"""
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Delete the link
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"""
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raise NotImplementedError
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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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@asyncio.coroutine
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def _start_streaming_pcap(self):
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"""
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Dump the pcap file on disk
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"""
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stream = yield from self.read_pcap_from_source()
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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 if the traffic stop the remaining data is not read
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# this is slow
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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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@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 node
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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(
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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 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 __json__(self):
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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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})
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return {
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"nodes": res, "link_id": self._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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}
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