# # 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 . """ Represents a uBridge hypervisor and starts/stops the associated uBridge process. """ import sys import os import subprocess import asyncio import socket import re from gns3server.utils import parse_version from gns3server.utils.asyncio import wait_for_process_termination from gns3server.utils.asyncio import subprocess_check_output from .ubridge_hypervisor import UBridgeHypervisor from .ubridge_error import UbridgeError import logging log = logging.getLogger(__name__) class Hypervisor(UBridgeHypervisor): """ Hypervisor. :param project: Project instance :param path: path to uBridge executable :param working_dir: working directory :param host: host/address for this hypervisor :param port: port for this hypervisor """ _instance_count = 1 def __init__(self, project, path, working_dir, host, port=None): if port is None: try: port = None info = socket.getaddrinfo(host, 0, socket.AF_UNSPEC, socket.SOCK_STREAM, 0, socket.AI_PASSIVE) if not info: raise UbridgeError(f"getaddrinfo returns an empty list on {host}") for res in info: af, socktype, proto, _, sa = res # let the OS find an unused port for the uBridge hypervisor with socket.socket(af, socktype, proto) as sock: sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(sa) port = sock.getsockname()[1] break except OSError as e: raise UbridgeError(f"Could not find free port for the uBridge hypervisor: {e}") super().__init__(host, port) self._project = project self._path = path self._working_dir = working_dir self._command = [] self._process = None self._stdout_file = "" self._started = False self._version = "" @property def process(self): """ Returns the subprocess of the Hypervisor :returns: subprocess """ return self._process @property def started(self): """ Returns either this hypervisor has been started or not. :returns: boolean """ return self._started @property def path(self): """ Returns the path to the uBridge executable. :returns: path to uBridge """ return self._path @path.setter def path(self, path): """ Sets the path to the uBridge executable. :param path: path to uBridge """ self._path = path @property def version(self): """ Returns the uBridge version. :returns: string """ return self._version async def _check_ubridge_version(self, env=None): """ Checks if the ubridge executable version """ try: output = await subprocess_check_output(self._path, "-v", cwd=self._working_dir, env=env) match = re.search(r"ubridge version ([0-9a-z\.]+)", output) if match: self._version = match.group(1) if sys.platform.startswith("darwin"): minimum_required_version = "0.9.12" else: # uBridge version 0.9.14 is required for packet filters # to work for IOU nodes. minimum_required_version = "0.9.14" if parse_version(self._version) < parse_version(minimum_required_version): raise UbridgeError(f"uBridge executable version must be >= {minimum_required_version}") else: raise UbridgeError(f"Could not determine uBridge version for {self._path}") except (OSError, subprocess.SubprocessError) as e: raise UbridgeError(f"Error while looking for uBridge version: {e}") async def start(self): """ Starts the uBridge hypervisor process. """ env = os.environ.copy() await self._check_ubridge_version(env) try: command = self._build_command() log.info(f"starting ubridge: {command}") self._stdout_file = os.path.join(self._working_dir, "ubridge.log") log.info(f"logging to {self._stdout_file}") with open(self._stdout_file, "w", encoding="utf-8") as fd: self._process = await asyncio.create_subprocess_exec( *command, stdout=fd, stderr=subprocess.STDOUT, cwd=self._working_dir, env=env ) log.info(f"ubridge started PID={self._process.pid}") # recv: Bad address is received by uBridge when a docker image stops by itself # see https://github.com/GNS3/gns3-gui/issues/2957 # monitor_process(self._process, self._termination_callback) except (OSError, subprocess.SubprocessError) as e: ubridge_stdout = self.read_stdout() log.error(f"Could not start ubridge: {e}\n{ubridge_stdout}") raise UbridgeError(f"Could not start ubridge: {e}\n{ubridge_stdout}") def _termination_callback(self, returncode): """ Called when the process has stopped. :param returncode: Process returncode """ if returncode != 0: error_msg = f"uBridge process has stopped, return code: {returncode}\n{self.read_stdout()}\n" log.error(error_msg) self._project.emit("log.error", {"message": error_msg}) else: log.info("uBridge process has stopped, return code: %d", returncode) async def stop(self): """ Stops the uBridge hypervisor process. """ if self.is_running(): log.info(f"Stopping uBridge process PID={self._process.pid}") await UBridgeHypervisor.stop(self) try: await wait_for_process_termination(self._process, timeout=3) except asyncio.TimeoutError: if self._process and self._process.returncode is None: log.warning(f"uBridge process {self._process.pid} is still running... killing it") try: self._process.kill() except ProcessLookupError: pass if self._stdout_file and os.access(self._stdout_file, os.W_OK): try: os.remove(self._stdout_file) except OSError as e: log.warning(f"could not delete temporary uBridge log file: {e}") self._process = None self._started = False def read_stdout(self): """ Reads the standard output of the uBridge process. Only use when the process has been stopped or has crashed. """ output = "" if self._stdout_file and os.access(self._stdout_file, os.R_OK): try: with open(self._stdout_file, "rb") as file: output = file.read().decode("utf-8", errors="replace") except OSError as e: log.warning(f"could not read {self._stdout_file}: {e}") return output def is_running(self): """ Checks if the process is running :returns: True or False """ if self._process and self._process.returncode is None: return True return False def _build_command(self): """ Command to start the uBridge hypervisor process. (to be passed to subprocess.Popen()) """ command = [self._path] command.extend(["-H", f"{self._host}:{self._port}"]) if log.getEffectiveLevel() == logging.DEBUG: command.extend(["-d", "1"]) return command