# -*- coding: utf-8 -*- # # Copyright (C) 2015 GNS3 Technologies Inc. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . """ VPCS VM management (creates command line, processes, files etc.) in order to run a VPCS VM. """ import os import sys import subprocess import signal import re import asyncio import shutil import gns3server.utils.asyncio from pkg_resources import parse_version from .vpcs_error import VPCSError from ..adapters.ethernet_adapter import EthernetAdapter from ..nios.nio_udp import NIOUDP from ..nios.nio_tap import NIOTAP from ..base_vm import BaseVM from ...utils.asyncio import subprocess_check_output import logging log = logging.getLogger(__name__) class VPCSVM(BaseVM): module_name = 'vpcs' """ VPCS VM implementation. :param name: VPCS VM name :param vm_id: VPCS VM identifier :param project: Project instance :param manager: Manager instance :param console: TCP console port :param startup_script: content of the startup script file """ def __init__(self, name, vm_id, project, manager, console=None, startup_script=None): super().__init__(name, vm_id, project, manager, console=console) self._command = [] self._process = None self._vpcs_stdout_file = "" self._started = False # VPCS settings if startup_script is not None: self.startup_script = startup_script self._ethernet_adapter = EthernetAdapter() # one adapter with 1 Ethernet interface @asyncio.coroutine def close(self): """ Closes this VPCS VM. """ log.debug('VPCS "{name}" [{id}] is closing'.format(name=self._name, id=self._id)) if self._console: self._manager.port_manager.release_tcp_port(self._console, self._project) self._console = None nio = self._ethernet_adapter.get_nio(0) if isinstance(nio, NIOUDP): self.manager.port_manager.release_udp_port(nio.lport, self._project) if self.is_running(): self._terminate_process() @asyncio.coroutine def _check_requirements(self): """ Check if VPCS is available with the correct version. """ path = self.vpcs_path if not path: raise VPCSError("No path to a VPCS executable has been set") if not os.path.isfile(path): raise VPCSError("VPCS program '{}' is not accessible".format(path)) if not os.access(path, os.X_OK): raise VPCSError("VPCS program '{}' is not executable".format(path)) yield from self._check_vpcs_version() def __json__(self): return {"name": self.name, "vm_id": self.id, "console": self._console, "project_id": self.project.id, "startup_script": self.startup_script, "startup_script_path": self.relative_startup_script} @property def relative_startup_script(self): """ Returns the startup config file relative to the project directory. :returns: path to config file. None if the file doesn't exist """ path = os.path.join(self.working_dir, 'startup.vpc') if os.path.exists(path): return 'startup.vpc' else: return None @property def vpcs_path(self): """ Returns the VPCS executable path. :returns: path to VPCS """ path = self._manager.config.get_section_config("VPCS").get("vpcs_path", "vpcs") if path == "vpcs": path = shutil.which("vpcs") return path @BaseVM.name.setter def name(self, new_name): """ Sets the name of this VPCS VM. :param new_name: name """ if self.script_file: content = self.startup_script content = content.replace(self._name, new_name) self.startup_script = content super(VPCSVM, VPCSVM).name.__set__(self, new_name) @property def startup_script(self): """ Returns the content of the current startup script """ script_file = self.script_file if script_file is None: return None try: with open(script_file, "rb") as f: return f.read().decode("utf-8", errors="replace") except OSError as e: raise VPCSError('Cannot read the startup script file "{}": {}'.format(script_file, e)) @startup_script.setter def startup_script(self, startup_script): """ Updates the startup script. :param startup_script: content of the startup script """ try: startup_script_path = os.path.join(self.working_dir, 'startup.vpc') with open(startup_script_path, "w+", encoding='utf-8') as f: if startup_script is None: f.write('') else: startup_script = startup_script.replace("%h", self._name) f.write(startup_script) except OSError as e: raise VPCSError('Cannot write the startup script file "{}": {}'.format(startup_script_path, e)) @asyncio.coroutine def _check_vpcs_version(self): """ Checks if the VPCS executable version is >= 0.5b1. """ try: output = yield from subprocess_check_output(self.vpcs_path, "-v", cwd=self.working_dir) match = re.search("Welcome to Virtual PC Simulator, version ([0-9a-z\.]+)", output) if match: version = match.group(1) if parse_version(version) < parse_version("0.5b1"): raise VPCSError("VPCS executable version must be >= 0.5b1") else: raise VPCSError("Could not determine the VPCS version for {}".format(self.vpcs_path)) except (OSError, subprocess.SubprocessError) as e: raise VPCSError("Error while looking for the VPCS version: {}".format(e)) @asyncio.coroutine def start(self): """ Starts the VPCS process. """ yield from self._check_requirements() if not self.is_running(): if not self._ethernet_adapter.get_nio(0): raise VPCSError("This VPCS instance must be connected in order to start") self._command = self._build_command() try: log.info("Starting VPCS: {}".format(self._command)) self._vpcs_stdout_file = os.path.join(self.working_dir, "vpcs.log") log.info("Logging to {}".format(self._vpcs_stdout_file)) flags = 0 if sys.platform.startswith("win32"): flags = subprocess.CREATE_NEW_PROCESS_GROUP with open(self._vpcs_stdout_file, "w", encoding="utf-8") as fd: self._process = yield from asyncio.create_subprocess_exec(*self._command, stdout=fd, stderr=subprocess.STDOUT, cwd=self.working_dir, creationflags=flags) log.info("VPCS instance {} started PID={}".format(self.name, self._process.pid)) self._started = True except (OSError, subprocess.SubprocessError) as e: vpcs_stdout = self.read_vpcs_stdout() log.error("Could not start VPCS {}: {}\n{}".format(self.vpcs_path, e, vpcs_stdout)) raise VPCSError("Could not start VPCS {}: {}\n{}".format(self.vpcs_path, e, vpcs_stdout)) @asyncio.coroutine def stop(self): """ Stops the VPCS process. """ if self.is_running(): self._terminate_process() if self._process.returncode is None: try: yield from gns3server.utils.asyncio.wait_for_process_termination(self._process, timeout=3) except asyncio.TimeoutError: if self._process.returncode is None: log.warn("VPCS process {} is still running... killing it".format(self._process.pid)) try: self._process.kill() except OSError as e: raise VPCSError("Can not stop the VPCS process: {}".format(e)) self._process = None self._started = False @asyncio.coroutine def reload(self): """ Reloads the VPCS process (stop & start). """ yield from self.stop() yield from self.start() def _terminate_process(self): """ Terminate the process if running """ log.info("Stopping VPCS instance {} PID={}".format(self.name, self._process.pid)) if sys.platform.startswith("win32"): self._process.send_signal(signal.CTRL_BREAK_EVENT) else: try: self._process.terminate() # Sometime the process may already be dead when we garbage collect except ProcessLookupError: pass def read_vpcs_stdout(self): """ Reads the standard output of the VPCS process. Only use when the process has been stopped or has crashed. """ output = "" if self._vpcs_stdout_file: try: with open(self._vpcs_stdout_file, "rb") as file: output = file.read().decode("utf-8", errors="replace") except OSError as e: log.warn("Could not read {}: {}".format(self._vpcs_stdout_file, e)) return output def is_running(self): """ Checks if the VPCS process is running :returns: True or False """ if self._process and self._process.returncode is None: return True return False def port_add_nio_binding(self, port_number, nio): """ Adds a port NIO binding. :param port_number: port number :param nio: NIO instance to add to the slot/port """ if not self._ethernet_adapter.port_exists(port_number): raise VPCSError("Port {port_number} doesn't exist in adapter {adapter}".format(adapter=self._ethernet_adapter, port_number=port_number)) self._ethernet_adapter.add_nio(port_number, nio) log.info('VPCS "{name}" [{id}]: {nio} added to port {port_number}'.format(name=self._name, id=self.id, nio=nio, port_number=port_number)) return nio def port_remove_nio_binding(self, port_number): """ Removes a port NIO binding. :param port_number: port number :returns: NIO instance """ if not self._ethernet_adapter.port_exists(port_number): raise VPCSError("Port {port_number} doesn't exist in adapter {adapter}".format(adapter=self._ethernet_adapter, port_number=port_number)) nio = self._ethernet_adapter.get_nio(port_number) if isinstance(nio, NIOUDP): self.manager.port_manager.release_udp_port(nio.lport, self._project) self._ethernet_adapter.remove_nio(port_number) log.info('VPCS "{name}" [{id}]: {nio} removed from port {port_number}'.format(name=self._name, id=self.id, nio=nio, port_number=port_number)) return nio def _build_command(self): """ Command to start the VPCS process. (to be passed to subprocess.Popen()) VPCS command line: usage: vpcs [options] [scriptfile] Option: -h print this help then exit -v print version information then exit -i num number of vpc instances to start (default is 9) -p port run as a daemon listening on the tcp 'port' -m num start byte of ether address, default from 0 -r file load and execute script file compatible with older versions, DEPRECATED. -e tap mode, using /dev/tapx by default (linux only) -u udp mode, default udp mode options: -s port local udp base port, default from 20000 -c port remote udp base port (dynamips udp port), default from 30000 -t ip remote host IP, default 127.0.0.1 tap mode options: -d vm device name, works only when -i is set to 1 hypervisor mode option: -H port run as the hypervisor listening on the tcp 'port' If no 'scriptfile' specified, vpcs will read and execute the file named 'startup.vpc' if it exsits in the current directory. """ command = [self.vpcs_path] command.extend(["-p", str(self._console)]) # listen to console port command.extend(["-m", str(self._manager.get_mac_id(self.id))]) # the unique ID is used to set the MAC address offset command.extend(["-i", "1"]) # option to start only one VPC instance command.extend(["-F"]) # option to avoid the daemonization of VPCS nio = self._ethernet_adapter.get_nio(0) if nio: if isinstance(nio, NIOUDP): # UDP tunnel command.extend(["-s", str(nio.lport)]) # source UDP port command.extend(["-c", str(nio.rport)]) # destination UDP port command.extend(["-t", nio.rhost]) # destination host elif isinstance(nio, NIOTAP): # TAP interface command.extend(["-e"]) command.extend(["-d", nio.tap_device]) if self.script_file: command.extend([os.path.basename(self.script_file)]) return command @property def script_file(self): """ Returns the startup script file for this VPCS VM. :returns: path to startup script file """ # use the default VPCS file if it exists path = os.path.join(self.working_dir, 'startup.vpc') if os.path.exists(path): return path else: return None