mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-25 01:38:08 +00:00
500 lines
17 KiB
Python
500 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 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 sys
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import os
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import struct
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import stat
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import asyncio
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import aiohttp
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import socket
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import shutil
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import re
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import logging
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log = logging.getLogger(__name__)
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from uuid import UUID, uuid4
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from gns3server.utils.interfaces import is_interface_up
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from ..config import Config
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from ..utils.asyncio import wait_run_in_executor
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from ..utils import force_unix_path
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from .project_manager import ProjectManager
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from .nios.nio_udp import NIOUDP
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from .nios.nio_tap import NIOTAP
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from .nios.nio_nat import NIONAT
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from .nios.nio_generic_ethernet import NIOGenericEthernet
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from ..utils.images import md5sum, remove_checksum
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from .vm_error import VMError
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class BaseManager:
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"""
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Base class for all Manager classes.
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Responsible of management of a VM pool of the same type.
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"""
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_convert_lock = None
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def __init__(self):
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BaseManager._convert_lock = asyncio.Lock()
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self._vms = {}
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self._port_manager = None
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self._config = Config.instance()
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@classmethod
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def instance(cls):
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"""
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Singleton to return only one instance of BaseManager.
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:returns: instance of BaseManager
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"""
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if not hasattr(cls, "_instance") or cls._instance is None:
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cls._instance = cls()
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return cls._instance
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@property
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def module_name(self):
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"""
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Returns the module name.
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:returns: module name
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"""
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return self.__class__.__name__
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@property
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def port_manager(self):
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"""
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Returns the port manager.
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:returns: Port manager
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"""
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return self._port_manager
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@port_manager.setter
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def port_manager(self, new_port_manager):
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self._port_manager = new_port_manager
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@property
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def config(self):
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"""
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Returns the server config.
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:returns: Config
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"""
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return self._config
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@asyncio.coroutine
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def unload(self):
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tasks = []
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for vm_id in self._vms.keys():
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tasks.append(asyncio.async(self.close_vm(vm_id)))
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if tasks:
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done, _ = yield from asyncio.wait(tasks)
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for future in done:
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try:
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future.result()
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except (Exception, GeneratorExit) as e:
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log.error("Could not close VM {}".format(e), exc_info=1)
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continue
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if hasattr(BaseManager, "_instance"):
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BaseManager._instance = None
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log.debug("Module {} unloaded".format(self.module_name))
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def get_vm(self, vm_id, project_id=None):
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"""
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Returns a VM instance.
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:param vm_id: VM identifier
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:param project_id: Project identifier
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:returns: VM instance
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"""
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if project_id:
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# check the project_id exists
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project = ProjectManager.instance().get_project(project_id)
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try:
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UUID(vm_id, version=4)
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except ValueError:
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raise aiohttp.web.HTTPBadRequest(text="VM ID {} is not a valid UUID".format(vm_id))
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if vm_id not in self._vms:
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raise aiohttp.web.HTTPNotFound(text="VM ID {} doesn't exist".format(vm_id))
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vm = self._vms[vm_id]
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if project_id:
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if vm.project.id != project.id:
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raise aiohttp.web.HTTPNotFound(text="Project ID {} doesn't belong to VM {}".format(project_id, vm.name))
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return vm
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@asyncio.coroutine
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def convert_old_project(self, project, legacy_id, name):
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"""
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Convert projects made before version 1.3
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:param project: Project instance
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:param legacy_id: old identifier
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:param name: node name
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:returns: new identifier
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"""
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new_id = str(uuid4())
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legacy_project_files_path = os.path.join(project.path, "{}-files".format(project.name))
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new_project_files_path = os.path.join(project.path, "project-files")
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if os.path.exists(legacy_project_files_path) and not os.path.exists(new_project_files_path):
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# move the project files
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log.info("Converting old project...")
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try:
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log.info('Moving "{}" to "{}"'.format(legacy_project_files_path, new_project_files_path))
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yield from wait_run_in_executor(shutil.move, legacy_project_files_path, new_project_files_path)
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except OSError as e:
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raise aiohttp.web.HTTPInternalServerError(text="Could not move project files directory: {} to {} {}".format(legacy_project_files_path,
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new_project_files_path, e))
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if project.is_local() is False:
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legacy_remote_project_path = os.path.join(project.location, project.name, self.module_name.lower())
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new_remote_project_path = os.path.join(project.path, "project-files", self.module_name.lower())
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if os.path.exists(legacy_remote_project_path) and not os.path.exists(new_remote_project_path):
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# move the legacy remote project (remote servers only)
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log.info("Converting old remote project...")
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try:
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log.info('Moving "{}" to "{}"'.format(legacy_remote_project_path, new_remote_project_path))
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yield from wait_run_in_executor(shutil.move, legacy_remote_project_path, new_remote_project_path)
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except OSError as e:
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raise aiohttp.web.HTTPInternalServerError(text="Could not move directory: {} to {} {}".format(legacy_remote_project_path,
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new_remote_project_path, e))
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if hasattr(self, "get_legacy_vm_workdir"):
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# rename old project VM working dir
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log.info("Converting old VM working directory...")
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legacy_vm_dir = self.get_legacy_vm_workdir(legacy_id, name)
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legacy_vm_working_path = os.path.join(new_project_files_path, legacy_vm_dir)
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new_vm_working_path = os.path.join(new_project_files_path, self.module_name.lower(), new_id)
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if os.path.exists(legacy_vm_working_path) and not os.path.exists(new_vm_working_path):
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try:
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log.info('Moving "{}" to "{}"'.format(legacy_vm_working_path, new_vm_working_path))
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yield from wait_run_in_executor(shutil.move, legacy_vm_working_path, new_vm_working_path)
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except OSError as e:
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raise aiohttp.web.HTTPInternalServerError(text="Could not move VM working directory: {} to {} {}".format(legacy_vm_working_path,
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new_vm_working_path, e))
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return new_id
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@asyncio.coroutine
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def create_vm(self, name, project_id, vm_id, *args, **kwargs):
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"""
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Create a new VM
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:param name: VM name
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:param project_id: Project identifier
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:param vm_id: restore a VM identifier
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"""
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if vm_id in self._vms:
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return self._vms[vm_id]
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project = ProjectManager.instance().get_project(project_id)
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if vm_id and isinstance(vm_id, int):
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with (yield from BaseManager._convert_lock):
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vm_id = yield from self.convert_old_project(project, vm_id, name)
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if not vm_id:
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vm_id = str(uuid4())
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vm = self._VM_CLASS(name, vm_id, project, self, *args, **kwargs)
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if asyncio.iscoroutinefunction(vm.create):
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yield from vm.create()
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else:
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vm.create()
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self._vms[vm.id] = vm
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project.add_vm(vm)
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return vm
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@asyncio.coroutine
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def close_vm(self, vm_id):
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"""
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Close a VM
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:param vm_id: VM identifier
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:returns: VM instance
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"""
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vm = self.get_vm(vm_id)
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if asyncio.iscoroutinefunction(vm.close):
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yield from vm.close()
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else:
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vm.close()
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return vm
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@asyncio.coroutine
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def project_closing(self, project):
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"""
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Called when a project is about to be closed.
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:param project: Project instance
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"""
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pass
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@asyncio.coroutine
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def project_closed(self, project):
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"""
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Called when a project is closed.
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:param project: Project instance
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"""
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for vm in project.vms:
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if vm.id in self._vms:
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del self._vms[vm.id]
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@asyncio.coroutine
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def project_moved(self, project):
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"""
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Called when a project is moved
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:param project: project instance
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"""
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pass
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@asyncio.coroutine
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def project_committed(self, project):
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"""
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Called when a project is committed.
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:param project: Project instance
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"""
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pass
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@asyncio.coroutine
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def delete_vm(self, vm_id):
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"""
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Delete a VM. VM working directory will be destroy when
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we receive a commit.
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:param vm_id: VM identifier
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:returns: VM instance
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"""
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vm = yield from self.close_vm(vm_id)
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vm.project.mark_vm_for_destruction(vm)
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if vm.id in self._vms:
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del self._vms[vm.id]
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return vm
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@staticmethod
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def has_privileged_access(executable):
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"""
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Check if an executable can access Ethernet and TAP devices in
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RAW mode.
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:param executable: executable path
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:returns: True or False
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"""
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if sys.platform.startswith("win"):
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# do not check anything on Windows
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return True
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if os.geteuid() == 0:
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# we are root, so we should have privileged access.
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return True
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if os.stat(executable).st_uid == 0 and (os.stat(executable).st_mode & stat.S_ISUID or os.stat(executable).st_mode & stat.S_ISGID):
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# the executable has set UID bit.
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return True
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# test if the executable has the CAP_NET_RAW capability (Linux only)
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try:
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if sys.platform.startswith("linux") and "security.capability" in os.listxattr(executable):
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caps = os.getxattr(executable, "security.capability")
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# test the 2nd byte and check if the 13th bit (CAP_NET_RAW) is set
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if struct.unpack("<IIIII", caps)[1] & 1 << 13:
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return True
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except OSError as e:
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log.error("could not determine if CAP_NET_RAW capability is set for {}: {}".format(executable, e))
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return False
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def create_nio(self, executable, nio_settings):
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"""
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Creates a new NIO.
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:param nio_settings: information to create the NIO
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:returns: a NIO object
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"""
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nio = None
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if nio_settings["type"] == "nio_udp":
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lport = nio_settings["lport"]
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rhost = nio_settings["rhost"]
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rport = nio_settings["rport"]
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try:
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info = socket.getaddrinfo(rhost, rport, socket.AF_UNSPEC, socket.SOCK_DGRAM, 0, socket.AI_PASSIVE)
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if not info:
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raise aiohttp.web.HTTPInternalServerError(text="getaddrinfo returns an empty list on {}:{}".format(rhost, rport))
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for res in info:
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af, socktype, proto, _, sa = res
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with socket.socket(af, socktype, proto) as sock:
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sock.connect(sa)
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except OSError as e:
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raise aiohttp.web.HTTPInternalServerError(text="Could not create an UDP connection to {}:{}: {}".format(rhost, rport, e))
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nio = NIOUDP(lport, rhost, rport)
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elif nio_settings["type"] == "nio_tap":
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tap_device = nio_settings["tap_device"]
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# if not is_interface_up(tap_device):
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# raise aiohttp.web.HTTPConflict(text="TAP interface {} does not exist or is down".format(tap_device))
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# FIXME: check for permissions on tap device
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# if not self.has_privileged_access(executable):
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# raise aiohttp.web.HTTPForbidden(text="{} has no privileged access to {}.".format(executable, tap_device))
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nio = NIOTAP(tap_device)
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elif nio_settings["type"] == "nio_generic_ethernet":
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ethernet_device = nio_settings["ethernet_device"]
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if not is_interface_up(ethernet_device):
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raise aiohttp.web.HTTPConflict(text="Ethernet interface {} does not exist or is down".format(ethernet_device))
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nio = NIOGenericEthernet(ethernet_device)
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elif nio_settings["type"] == "nio_nat":
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nio = NIONAT()
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assert nio is not None
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return nio
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def get_abs_image_path(self, path):
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"""
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Get the absolute path of an image
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:param path: file path
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:return: file path
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"""
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if not path:
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return ""
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img_directory = self.get_images_directory()
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# Windows path should not be send to a unix server
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if not sys.platform.startswith("win"):
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if re.match(r"^[A-Z]:", path) is not None:
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raise VMError("{} is not allowed on this remote server. Please use only a filename in {}.".format(path, img_directory))
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if not os.path.isabs(path):
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s = os.path.split(path)
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path = os.path.normpath(os.path.join(img_directory, *s))
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# Compatibility with old topologies we look in parent directory
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# We look at first in new location
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if not os.path.exists(path):
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old_path = os.path.normpath(os.path.join(img_directory, '..', *s))
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if os.path.exists(old_path):
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return force_unix_path(old_path)
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return force_unix_path(path)
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else:
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# For non local server we disallow using absolute path outside image directory
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if Config.instance().get_section_config("Server").get("local", False) is False:
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img_directory = self.config.get_section_config("Server").get("images_path", os.path.expanduser("~/GNS3/images"))
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img_directory = force_unix_path(img_directory)
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path = force_unix_path(path)
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if len(os.path.commonprefix([img_directory, path])) < len(img_directory):
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raise VMError("{} is not allowed on this remote server. Please use only a filename in {}.".format(path, img_directory))
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return force_unix_path(path)
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def get_relative_image_path(self, path):
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"""
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Get a path relative to images directory path
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or an abspath if the path is not located inside
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image directory
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:param path: file path
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:return: file path
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"""
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if not path:
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return ""
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img_directory = force_unix_path(self.get_images_directory())
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path = force_unix_path(self.get_abs_image_path(path))
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if os.path.commonprefix([img_directory, path]) == img_directory:
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return os.path.relpath(path, img_directory)
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return path
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@asyncio.coroutine
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def list_images(self):
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"""
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Return the list of available images for this VM type
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:returns: Array of hash
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"""
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images = []
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img_dir = self.get_images_directory()
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for root, dirs, files in os.walk(img_dir):
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for filename in files:
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if filename[0] != "." and not filename.endswith(".md5sum"):
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path = os.path.relpath(os.path.join(root, filename), img_dir)
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images.append({
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"filename": filename,
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"path": path})
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return images
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def get_images_directory(self):
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"""
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Get the image directory on disk
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"""
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raise NotImplementedError
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@asyncio.coroutine
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def write_image(self, filename, stream):
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directory = self.get_images_directory()
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path = os.path.abspath(os.path.join(directory, *os.path.split(filename)))
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if os.path.commonprefix([directory, path]) != directory:
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raise aiohttp.web.HTTPForbidden(text="Could not write image: {}, {} is forbiden".format(filename, path))
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log.info("Writting image file %s", path)
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try:
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remove_checksum(path)
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os.makedirs(os.path.dirname(path), exist_ok=True)
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with open(path, 'wb+') as f:
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while True:
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packet = yield from stream.read(512)
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if not packet:
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break
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f.write(packet)
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os.chmod(path, stat.S_IWRITE | stat.S_IREAD | stat.S_IEXEC)
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md5sum(path)
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except OSError as e:
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raise aiohttp.web.HTTPConflict(text="Could not write image: {} because {}".format(filename, e))
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