mirror of
https://github.com/GNS3/gns3-server
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380 lines
12 KiB
Python
380 lines
12 KiB
Python
#
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# Copyright (C) 2013 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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"""
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Interface for Dynamips virtual Frame-Relay switch module.
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http://github.com/GNS3/dynamips/blob/master/README.hypervisor#L642
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"""
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import asyncio
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from .device import Device
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from ..nios.nio_udp import NIOUDP
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from ..dynamips_error import DynamipsError
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import logging
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log = logging.getLogger(__name__)
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class FrameRelaySwitch(Device):
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"""
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Dynamips Frame Relay switch.
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:param name: name for this switch
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:param node_id: Node instance identifier
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:param project: Project instance
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:param manager: Parent VM Manager
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:param hypervisor: Dynamips hypervisor instance
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"""
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def __init__(self, name, node_id, project, manager, mappings=None, hypervisor=None):
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super().__init__(name, node_id, project, manager, hypervisor)
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self._nios = {}
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self._active_mappings = {}
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self._mappings = {}
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if mappings:
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self._mappings = mappings
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def asdict(self):
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mappings = {}
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for source, destination in self._mappings.items():
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mappings[source] = destination
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return {
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"name": self.name,
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"usage": self.usage,
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"node_id": self.id,
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"project_id": self.project.id,
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"mappings": mappings,
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"status": "started",
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}
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async def create(self):
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if self._hypervisor is None:
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module_workdir = self.project.module_working_directory(self.manager.module_name.lower())
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self._hypervisor = await self.manager.start_new_hypervisor(working_dir=module_workdir)
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await self._hypervisor.send(f'frsw create "{self._name}"')
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log.info(f'Frame Relay switch "{self._name}" [{self._id}] has been created')
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self._hypervisor.devices.append(self)
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async def set_name(self, new_name):
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"""
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Renames this Frame Relay switch.
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:param new_name: New name for this switch
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"""
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await self._hypervisor.send(f'frsw rename "{self._name}" "{new_name}"')
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log.info(
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'Frame Relay switch "{name}" [{id}]: renamed to "{new_name}"'.format(
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name=self._name, id=self._id, new_name=new_name
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)
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)
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self._name = new_name
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@property
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def nios(self):
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"""
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Returns all the NIOs member of this Frame Relay switch.
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:returns: nio list
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"""
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return self._nios
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@property
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def mappings(self):
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"""
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Returns port mappings
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:returns: mappings list
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"""
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return self._mappings
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@mappings.setter
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def mappings(self, mappings):
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"""
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Sets port mappings
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:param mappings: mappings list
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"""
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self._mappings = mappings
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async def close(self):
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for nio in self._nios.values():
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if nio:
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await nio.close()
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if self._hypervisor:
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try:
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await self._hypervisor.send(f'frsw delete "{self._name}"')
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log.info(f'Frame Relay switch "{self._name}" [{self._id}] has been deleted')
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except DynamipsError:
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log.debug(f"Could not properly delete Frame relay switch {self._name}")
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if self._hypervisor and self in self._hypervisor.devices:
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self._hypervisor.devices.remove(self)
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if self._hypervisor and not self._hypervisor.devices:
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await self.hypervisor.stop()
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self._hypervisor = None
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async def delete(self):
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"""
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Deletes this Frame Relay switch.
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"""
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await self.close()
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return True
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def has_port(self, port):
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"""
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Checks if a port exists on this Frame Relay switch.
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:returns: boolean
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"""
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if port in self._nios:
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return True
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return False
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async def add_nio(self, nio, port_number):
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"""
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Adds a NIO as new port on Frame Relay switch.
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:param nio: NIO instance to add
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:param port_number: port to allocate for the NIO
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"""
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if port_number in self._nios:
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raise DynamipsError(f"Port {port_number} isn't free")
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log.info(
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'Frame Relay switch "{name}" [{id}]: NIO {nio} bound to port {port}'.format(
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name=self._name, id=self._id, nio=nio, port=port_number
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)
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)
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self._nios[port_number] = nio
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await self.set_mappings(self._mappings)
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async def remove_nio(self, port_number):
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"""
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Removes the specified NIO as member of this Frame Relay switch.
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:param port_number: allocated port number
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:returns: the NIO that was bound to the allocated port
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"""
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if port_number not in self._nios:
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raise DynamipsError(f"Port {port_number} is not allocated")
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await self.stop_capture(port_number)
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# remove VCs mapped with the port
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for source, destination in self._active_mappings.copy().items():
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source_port, source_dlci = source
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destination_port, destination_dlci = destination
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if port_number == source_port:
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log.info(
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'Frame Relay switch "{name}" [{id}]: unmapping VC between port {source_port} DLCI {source_dlci} and port {destination_port} DLCI {destination_dlci}'.format(
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name=self._name,
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id=self._id,
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source_port=source_port,
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source_dlci=source_dlci,
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destination_port=destination_port,
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destination_dlci=destination_dlci,
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)
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)
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await self.unmap_vc(source_port, source_dlci, destination_port, destination_dlci)
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await self.unmap_vc(destination_port, destination_dlci, source_port, source_dlci)
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nio = self._nios[port_number]
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if isinstance(nio, NIOUDP):
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self.manager.port_manager.release_udp_port(nio.lport, self._project)
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log.info(
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'Frame Relay switch "{name}" [{id}]: NIO {nio} removed from port {port}'.format(
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name=self._name, id=self._id, nio=nio, port=port_number
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)
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)
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del self._nios[port_number]
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return nio
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def get_nio(self, port_number):
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"""
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Gets a port NIO binding.
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:param port_number: port number
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:returns: NIO instance
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"""
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if port_number not in self._nios:
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raise DynamipsError(f"Port {port_number} is not allocated")
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nio = self._nios[port_number]
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if not nio:
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raise DynamipsError(f"Port {port_number} is not connected")
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return nio
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async def set_mappings(self, mappings):
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"""
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Applies VC mappings
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:param mappings: mappings (dict)
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"""
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for source, destination in mappings.items():
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if not isinstance(source, str) or not isinstance(destination, str):
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raise DynamipsError("Invalid Frame-Relay mappings")
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source_port, source_dlci = map(int, source.split(":"))
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destination_port, destination_dlci = map(int, destination.split(":"))
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if self.has_port(destination_port):
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if (source_port, source_dlci) not in self._active_mappings and (
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destination_port,
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destination_dlci,
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) not in self._active_mappings:
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log.info(
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'Frame Relay switch "{name}" [{id}]: mapping VC between port {source_port} DLCI {source_dlci} and port {destination_port} DLCI {destination_dlci}'.format(
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name=self._name,
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id=self._id,
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source_port=source_port,
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source_dlci=source_dlci,
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destination_port=destination_port,
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destination_dlci=destination_dlci,
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)
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)
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await self.map_vc(source_port, source_dlci, destination_port, destination_dlci)
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await self.map_vc(destination_port, destination_dlci, source_port, source_dlci)
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async def map_vc(self, port1, dlci1, port2, dlci2):
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"""
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Creates a new Virtual Circuit connection (unidirectional).
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:param port1: input port
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:param dlci1: input DLCI
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:param port2: output port
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:param dlci2: output DLCI
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"""
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if port1 not in self._nios:
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return
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if port2 not in self._nios:
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return
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nio1 = self._nios[port1]
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nio2 = self._nios[port2]
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await self._hypervisor.send(
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'frsw create_vc "{name}" {input_nio} {input_dlci} {output_nio} {output_dlci}'.format(
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name=self._name, input_nio=nio1, input_dlci=dlci1, output_nio=nio2, output_dlci=dlci2
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)
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)
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log.info(
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'Frame Relay switch "{name}" [{id}]: VC from port {port1} DLCI {dlci1} to port {port2} DLCI {dlci2} created'.format(
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name=self._name, id=self._id, port1=port1, dlci1=dlci1, port2=port2, dlci2=dlci2
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)
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)
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self._active_mappings[(port1, dlci1)] = (port2, dlci2)
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async def unmap_vc(self, port1, dlci1, port2, dlci2):
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"""
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Deletes a Virtual Circuit connection (unidirectional).
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:param port1: input port
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:param dlci1: input DLCI
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:param port2: output port
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:param dlci2: output DLCI
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"""
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if port1 not in self._nios:
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raise DynamipsError(f"Port {port1} is not allocated")
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if port2 not in self._nios:
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raise DynamipsError(f"Port {port2} is not allocated")
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nio1 = self._nios[port1]
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nio2 = self._nios[port2]
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await self._hypervisor.send(
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'frsw delete_vc "{name}" {input_nio} {input_dlci} {output_nio} {output_dlci}'.format(
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name=self._name, input_nio=nio1, input_dlci=dlci1, output_nio=nio2, output_dlci=dlci2
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)
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)
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log.info(
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'Frame Relay switch "{name}" [{id}]: VC from port {port1} DLCI {dlci1} to port {port2} DLCI {dlci2} deleted'.format(
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name=self._name, id=self._id, port1=port1, dlci1=dlci1, port2=port2, dlci2=dlci2
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)
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)
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del self._active_mappings[(port1, dlci1)]
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async def start_capture(self, port_number, output_file, data_link_type="DLT_FRELAY"):
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"""
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Starts a packet capture.
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:param port_number: allocated port number
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:param output_file: PCAP destination file for the capture
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:param data_link_type: PCAP data link type (DLT_*), default is DLT_FRELAY
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"""
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nio = self.get_nio(port_number)
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data_link_type = data_link_type.lower()
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if data_link_type.startswith("dlt_"):
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data_link_type = data_link_type[4:]
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if nio.input_filter[0] is not None and nio.output_filter[0] is not None:
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raise DynamipsError(f"Port {port_number} has already a filter applied")
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await nio.start_packet_capture(output_file, data_link_type)
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log.info(
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'Frame relay switch "{name}" [{id}]: starting packet capture on port {port}'.format(
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name=self._name, id=self._id, port=port_number
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)
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)
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async def stop_capture(self, port_number):
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"""
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Stops a packet capture.
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:param port_number: allocated port number
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"""
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nio = self.get_nio(port_number)
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if not nio.capturing:
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return
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await nio.stop_packet_capture()
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log.info(
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'Frame relay switch "{name}" [{id}]: stopping packet capture on port {port}'.format(
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name=self._name, id=self._id, port=port_number
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)
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)
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