mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-11-17 09:14:52 +02:00
658 lines
21 KiB
Python
658 lines
21 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2014 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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VPCS server module.
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"""
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import os
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import sys
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import base64
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import tempfile
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import struct
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import socket
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import shutil
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from gns3server.modules import IModule
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from gns3server.config import Config
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import gns3server.jsonrpc as jsonrpc
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from .vpcs_device import VPCSDevice
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from .vpcs_error import VPCSError
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from .nios.nio_udp import NIO_UDP
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from .nios.nio_tap import NIO_TAP
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from ..attic import find_unused_port
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from .schemas import VPCS_CREATE_SCHEMA
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from .schemas import VPCS_DELETE_SCHEMA
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from .schemas import VPCS_UPDATE_SCHEMA
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from .schemas import VPCS_START_SCHEMA
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from .schemas import VPCS_STOP_SCHEMA
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from .schemas import VPCS_RELOAD_SCHEMA
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from .schemas import VPCS_ALLOCATE_UDP_PORT_SCHEMA
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from .schemas import VPCS_ADD_NIO_SCHEMA
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from .schemas import VPCS_DELETE_NIO_SCHEMA
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import logging
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log = logging.getLogger(__name__)
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class VPCS(IModule):
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"""
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VPCS module.
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:param name: module name
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:param args: arguments for the module
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:param kwargs: named arguments for the module
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"""
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def __init__(self, name, *args, **kwargs):
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# get the VPCS location
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config = Config.instance()
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vpcs_config = config.get_section_config(name.upper())
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self._vpcs = vpcs_config.get("vpcs")
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if not self._vpcs or not os.path.isfile(self._vpcs):
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vpcs_in_cwd = os.path.join(os.getcwd(), "vpcs")
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if os.path.isfile(vpcs_in_cwd):
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self._vpcs = vpcs_in_cwd
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else:
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# look for vpcs if none is defined or accessible
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for path in os.environ["PATH"].split(":"):
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try:
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if "vpcs" in os.listdir(path) and os.access(os.path.join(path, "vpcs"), os.X_OK):
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self._vpcs = os.path.join(path, "vpcs")
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break
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except OSError:
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continue
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if not self._vpcs:
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log.warning("VPCS binary couldn't be found!")
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elif not os.access(self._vpcs, os.X_OK):
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log.warning("VPCS is not executable")
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# a new process start when calling IModule
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IModule.__init__(self, name, *args, **kwargs)
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self._vpcs_instances = {}
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self._console_start_port_range = 4001
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self._console_end_port_range = 4512
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self._allocated_console_ports = []
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self._current_console_port = self._console_start_port_range
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self._udp_start_port_range = 30001
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self._udp_end_port_range = 40001
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self._current_udp_port = self._udp_start_port_range
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self._host = kwargs["host"]
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self._projects_dir = kwargs["projects_dir"]
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self._tempdir = kwargs["temp_dir"]
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self._working_dir = self._projects_dir
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# check every 5 seconds
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#self._vpcs_callback = self.add_periodic_callback(self._check_vpcs_is_alive, 5000)
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#self._vpcs_callback.start()
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def stop(self, signum=None):
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"""
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Properly stops the module.
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:param signum: signal number (if called by the signal handler)
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"""
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# self._vpcs_callback.stop()
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# delete all VPCS instances
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for vpcs_id in self._vpcs_instances:
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vpcs_instance = self._vpcs_instances[vpcs_id]
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vpcs_instance.delete()
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IModule.stop(self, signum) # this will stop the I/O loop
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def _check_vpcs_is_alive(self):
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"""
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Periodic callback to check if VPCS is alive
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for each VPCS instance.
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Sends a notification to the client if not.
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"""
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for vpcs_id in self._vpcs_instances:
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vpcs_instance = self._vpcs_instances[vpcs_id]
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if vpcs_instance.started and (not vpcs_instance.is_running() or not vpcs_instance.is_vpcs_running()):
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notification = {"module": self.name,
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"id": vpcs_id,
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"name": vpcs_instance.name}
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if not vpcs_instance.is_running():
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stdout = vpcs_instance.read_vpcs_stdout()
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notification["message"] = "VPCS has stopped running"
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notification["details"] = stdout
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self.send_notification("{}.vpcs_stopped".format(self.name), notification)
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vpcs_instance.stop()
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def get_vpcs_instance(self, vpcs_id):
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"""
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Returns a VPCS device instance.
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:param vpcs_id: VPCS device identifier
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:returns: VPCSDevice instance
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"""
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if vpcs_id not in self._vpcs_instances:
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log.debug("VPCS device ID {} doesn't exist".format(vpcs_id), exc_info=1)
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self.send_custom_error("VPCS device ID {} doesn't exist".format(vpcs_id))
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return None
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return self._vpcs_instances[vpcs_id]
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@IModule.route("vpcs.reset")
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def reset(self, request):
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"""
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Resets the module.
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:param request: JSON request
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"""
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# delete all vpcs instances
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for vpcs_id in self._vpcs_instances:
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vpcs_instance = self._vpcs_instances[vpcs_id]
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vpcs_instance.delete()
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# resets the instance IDs
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VPCSDevice.reset()
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self._vpcs_instances.clear()
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self._remote_server = False
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self._current_console_port = self._console_start_port_range
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self._current_udp_port = self._udp_start_port_range
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log.info("VPCS module has been reset")
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@IModule.route("vpcs.settings")
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def settings(self, request):
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"""
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Set or update settings.
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Optional request parameters:
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- working_dir (path to a working directory)
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- project_name
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- console_start_port_range
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- console_end_port_range
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- udp_start_port_range
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- udp_end_port_range
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:param request: JSON request
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"""
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if request == None:
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self.send_param_error()
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return
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if "vpcs" in request and request["vpcs"]:
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self._vpcs = request["vpcs"]
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log.info("VPCS path set to {}".format(self._vpcs))
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if "working_dir" in request:
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new_working_dir = request["working_dir"]
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log.info("this server is local with working directory path to {}".format(new_working_dir))
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else:
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new_working_dir = os.path.join(self._projects_dir, request["project_name"] + ".gns3")
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log.info("this server is remote with working directory path to {}".format(new_working_dir))
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if self._projects_dir != self._working_dir != new_working_dir:
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if not os.path.isdir(new_working_dir):
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try:
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shutil.move(self._working_dir, new_working_dir)
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except OSError as e:
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log.error("could not move working directory from {} to {}: {}".format(self._working_dir,
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new_working_dir,
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e))
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return
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# update the working directory if it has changed
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if self._working_dir != new_working_dir:
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self._working_dir = new_working_dir
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for vpcs_id in self._vpcs_instances:
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vpcs_instance = self._vpcs_instances[vpcs_id]
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vpcs_instance.working_dir = self._working_dir
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if "console_start_port_range" in request and "console_end_port_range" in request:
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self._console_start_port_range = request["console_start_port_range"]
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self._console_end_port_range = request["console_end_port_range"]
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if "udp_start_port_range" in request and "udp_end_port_range" in request:
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self._udp_start_port_range = request["udp_start_port_range"]
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self._udp_end_port_range = request["udp_end_port_range"]
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log.debug("received request {}".format(request))
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def test_result(self, message, result="error"):
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"""
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"""
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return {"result": result, "message": message}
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@IModule.route("vpcs.test_settings")
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def test_settings(self, request):
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"""
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"""
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response = []
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self.send_response(response)
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@IModule.route("vpcs.create")
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def vpcs_create(self, request):
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"""
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Creates a new VPCS instance.
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Mandatory request parameters:
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- path (path to the VPCS executable)
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Optional request parameters:
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- name (VPCS name)
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Response parameters:
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- id (VPCS instance identifier)
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- name (VPCS name)
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- default settings
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_CREATE_SCHEMA):
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return
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name = None
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if "name" in request:
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name = request["name"]
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base_script_file = None
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if "base_script_file" in request:
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base_script_file = request["base_script_file"]
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vpcs_path = request["path"]
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try:
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try:
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os.makedirs(self._working_dir)
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except FileExistsError:
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pass
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except OSError as e:
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raise VPCSError("Could not create working directory {}".format(e))
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vpcs_instance = VPCSDevice(vpcs_path, base_script_file, self._working_dir, host=self._host, name=name)
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# find a console port
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if self._current_console_port > self._console_end_port_range:
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self._current_console_port = self._console_start_port_range
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try:
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vpcs_instance.console = find_unused_port(self._current_console_port, self._console_end_port_range, self._host)
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except Exception as e:
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raise VPCSError(e)
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self._current_console_port += 1
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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response = {"name": vpcs_instance.name,
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"id": vpcs_instance.id}
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defaults = vpcs_instance.defaults()
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response.update(defaults)
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self._vpcs_instances[vpcs_instance.id] = vpcs_instance
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self.send_response(response)
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@IModule.route("vpcs.delete")
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def vpcs_delete(self, request):
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"""
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Deletes a VPCS instance.
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Mandatory request parameters:
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- id (VPCS instance identifier)
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Response parameter:
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- True on success
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_DELETE_SCHEMA):
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return
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# get the instance
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vpcs_instance = self.get_vpcs_instance(request["id"])
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if not vpcs_instance:
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return
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try:
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vpcs_instance.delete()
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del self._vpcs_instances[request["id"]]
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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self.send_response(True)
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@IModule.route("vpcs.update")
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def vpcs_update(self, request):
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"""
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Updates a VPCS instance
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Mandatory request parameters:
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- id (VPCS instance identifier)
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Optional request parameters:
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- any setting to update
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Response parameters:
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- updated settings
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_UPDATE_SCHEMA):
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return
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# get the instance
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vpcs_instance = self.get_vpcs_instance(request["id"])
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if not vpcs_instance:
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return
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response = {}
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# update the VPCS settings
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for name, value in request.items():
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if hasattr(vpcs_instance, name) and getattr(vpcs_instance, name) != value:
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try:
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setattr(vpcs_instance, name, value)
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response[name] = value
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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self.send_response(response)
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@IModule.route("vpcs.start")
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def vm_start(self, request):
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"""
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Starts a VPCS instance.
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Mandatory request parameters:
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- id (VPCS instance identifier)
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Response parameters:
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- True on success
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_START_SCHEMA):
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return
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# get the instance
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vpcs_instance = self.get_vpcs_instance(request["id"])
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if not vpcs_instance:
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return
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try:
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log.debug("starting VPCS with command: {}".format(vpcs_instance.command()))
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vpcs_instance.vpcs = self._vpcs
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vpcs_instance.start()
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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self.send_response(True)
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@IModule.route("vpcs.stop")
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def vm_stop(self, request):
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"""
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Stops a VPCS instance.
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Mandatory request parameters:
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- id (VPCS instance identifier)
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Response parameters:
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- True on success
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_STOP_SCHEMA):
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return
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# get the instance
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vpcs_instance = self.get_vpcs_instance(request["id"])
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if not vpcs_instance:
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return
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try:
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vpcs_instance.stop()
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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self.send_response(True)
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@IModule.route("vpcs.reload")
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def vm_reload(self, request):
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"""
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Reloads a VPCS instance.
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Mandatory request parameters:
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- id (VPCS identifier)
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Response parameters:
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- True on success
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_RELOAD_SCHEMA):
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return
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# get the instance
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vpcs_instance = self.get_vpcs_instance(request["id"])
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if not vpcs_instance:
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return
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try:
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if vpcs_instance.is_running():
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vpcs_instance.stop()
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vpcs_instance.start()
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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self.send_response(True)
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@IModule.route("vpcs.allocate_udp_port")
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def allocate_udp_port(self, request):
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"""
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Allocates a UDP port in order to create an UDP NIO.
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Mandatory request parameters:
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- id (VPCS identifier)
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- port_id (unique port identifier)
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Response parameters:
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- port_id (unique port identifier)
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- lport (allocated local port)
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:param request: JSON request
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"""
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# validate the request
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if not self.validate_request(request, VPCS_ALLOCATE_UDP_PORT_SCHEMA):
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return
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# get the instance
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vpcs_instance = self.get_vpcs_instance(request["id"])
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if not vpcs_instance:
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return
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try:
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# find a UDP port
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if self._current_udp_port >= self._udp_end_port_range:
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self._current_udp_port = self._udp_start_port_range
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try:
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port = find_unused_port(self._current_udp_port, self._udp_end_port_range, host=self._host, socket_type="UDP")
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except Exception as e:
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raise VPCSError(e)
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self._current_udp_port += 1
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log.info("{} [id={}] has allocated UDP port {} with host {}".format(vpcs_instance.name,
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vpcs_instance.id,
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port,
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self._host))
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response = {"lport": port}
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except VPCSError as e:
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self.send_custom_error(str(e))
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return
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response["port_id"] = request["port_id"]
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self.send_response(response)
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def _check_for_privileged_access(self, device):
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"""
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Check if VPCS can access Ethernet and TAP devices.
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:param device: device name
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"""
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# we are root, so vpcs should have privileged access too
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if os.geteuid() == 0:
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return
|
|
|
|
# test if VPCS has the CAP_NET_RAW capability
|
|
if "security.capability" in os.listxattr(self._vpcs):
|
|
try:
|
|
caps = os.getxattr(self._vpcs, "security.capability")
|
|
# test the 2nd byte and check if the 13th bit (CAP_NET_RAW) is set
|
|
if struct.unpack("<IIIII", caps)[1] & 1 << 13:
|
|
return
|
|
except Exception as e:
|
|
log.error("could not determine if CAP_NET_RAW capability is set for {}: {}".format(self._vpcs, e))
|
|
return
|
|
|
|
raise VPCSError("{} has no privileged access to {}.".format(self._vpcs, device))
|
|
|
|
@IModule.route("vpcs.add_nio")
|
|
def add_nio(self, request):
|
|
"""
|
|
Adds an NIO (Network Input/Output) for a VPCS instance.
|
|
|
|
Mandatory request parameters:
|
|
- id (VPCS instance identifier)
|
|
- slot (slot number)
|
|
- port (port number)
|
|
- port_id (unique port identifier)
|
|
- nio (one of the following)
|
|
- type "nio_udp"
|
|
- lport (local port)
|
|
- rhost (remote host)
|
|
- rport (remote port)
|
|
- type "nio_tap"
|
|
- tap_device (TAP device name e.g. tap0)
|
|
|
|
Response parameters:
|
|
- port_id (unique port identifier)
|
|
|
|
:param request: JSON request
|
|
"""
|
|
|
|
# validate the request
|
|
if not self.validate_request(request, VPCS_ADD_NIO_SCHEMA):
|
|
return
|
|
|
|
# get the instance
|
|
vpcs_instance = self.get_vpcs_instance(request["id"])
|
|
if not vpcs_instance:
|
|
return
|
|
|
|
slot = request["slot"]
|
|
port = request["port"]
|
|
try:
|
|
nio = None
|
|
if request["nio"]["type"] == "nio_udp":
|
|
lport = request["nio"]["lport"]
|
|
rhost = request["nio"]["rhost"]
|
|
rport = request["nio"]["rport"]
|
|
nio = NIO_UDP(lport, rhost, rport)
|
|
elif request["nio"]["type"] == "nio_tap":
|
|
tap_device = request["nio"]["tap_device"]
|
|
self._check_for_privileged_access(tap_device)
|
|
nio = NIO_TAP(tap_device)
|
|
if not nio:
|
|
raise VPCSError("Requested NIO does not exist or is not supported: {}".format(request["nio"]["type"]))
|
|
except VPCSError as e:
|
|
self.send_custom_error(str(e))
|
|
return
|
|
|
|
try:
|
|
vpcs_instance.slot_add_nio_binding(slot, port, nio)
|
|
except VPCSError as e:
|
|
self.send_custom_error(str(e))
|
|
return
|
|
|
|
self.send_response({"port_id": request["port_id"]})
|
|
|
|
@IModule.route("vpcs.delete_nio")
|
|
def delete_nio(self, request):
|
|
"""
|
|
Deletes an NIO (Network Input/Output).
|
|
|
|
Mandatory request parameters:
|
|
- id (VPCS instance identifier)
|
|
- slot (slot identifier)
|
|
- port (port identifier)
|
|
|
|
Response parameters:
|
|
- True on success
|
|
|
|
:param request: JSON request
|
|
"""
|
|
|
|
# validate the request
|
|
if not self.validate_request(request, VPCS_DELETE_NIO_SCHEMA):
|
|
return
|
|
|
|
# get the instance
|
|
vpcs_instance = self.get_vpcs_instance(request["id"])
|
|
if not vpcs_instance:
|
|
return
|
|
|
|
slot = request["slot"]
|
|
port = request["port"]
|
|
try:
|
|
vpcs_instance.slot_remove_nio_binding(slot, port)
|
|
except VPCSError as e:
|
|
self.send_custom_error(str(e))
|
|
return
|
|
|
|
self.send_response(True)
|
|
|
|
@IModule.route("vpcs.echo")
|
|
def echo(self, request):
|
|
"""
|
|
Echo end point for testing purposes.
|
|
|
|
:param request: JSON request
|
|
"""
|
|
|
|
if request == None:
|
|
self.send_param_error()
|
|
else:
|
|
log.debug("received request {}".format(request))
|
|
self.send_response(request)
|