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@ -15,9 +15,370 @@
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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 device management (creates command line, processes, files etc.) in
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order to run an VPCS instance.
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"""
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import os
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import sys
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import subprocess
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import signal
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import shutil
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import re
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import asyncio
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from pkg_resources import parse_version
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from .vpcs_error import VPCSError
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from .adapters.ethernet_adapter import EthernetAdapter
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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 ..base_vm import BaseVM
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import logging
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log = logging.getLogger(__name__)
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class VPCSDevice(BaseVM):
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pass
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"""
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VPCS device implementation.
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:param name: name of this VPCS device
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:param vpcs_id: VPCS instance ID
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:param path: path to VPCS executable
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:param working_dir: path to a working directory
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:param console: TCP console port
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:param console_host: IP address to bind for console connections
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:param console_start_port_range: TCP console port range start
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:param console_end_port_range: TCP console port range end
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"""
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def __init__(self, name, vpcs_id,
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path = None,
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working_dir = None,
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console=None,
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console_host="0.0.0.0",
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console_start_port_range=4512,
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console_end_port_range=5000):
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#self._path = path
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#self._working_dir = working_dir
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# TODO: Hardcodded for testing
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self._path = "/usr/local/bin/vpcs"
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self._working_dir = "/tmp"
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self._console = console
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self._console_host = console_host
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self._command = []
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self._process = None
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self._vpcs_stdout_file = ""
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self._started = False
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self._console_start_port_range = console_start_port_range
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self._console_end_port_range = console_end_port_range
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# VPCS settings
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self._script_file = ""
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self._ethernet_adapter = EthernetAdapter() # one adapter with 1 Ethernet interface
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# working_dir_path = os.path.join(working_dir, "vpcs", "pc-{}".format(self._id))
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#
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# if vpcs_id and not os.path.isdir(working_dir_path):
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# raise VPCSError("Working directory {} doesn't exist".format(working_dir_path))
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#
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# # create the device own working directory
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# self.working_dir = working_dir_path
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#
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super().__init__(name, vpcs_id)
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@asyncio.coroutine
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def _create(self):
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"""Called when run loop is started"""
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self._check_requirement()
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def _check_requirement(self):
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"""Check if VPCS is available with the correct version"""
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if not self._path:
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raise VPCSError("No path to a VPCS executable has been set")
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if not os.path.isfile(self._path):
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raise VPCSError("VPCS program '{}' is not accessible".format(self._path))
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if not os.access(self._path, os.X_OK):
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raise VPCSError("VPCS program '{}' is not executable".format(self._path))
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yield from self._check_vpcs_version()
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def defaults(self):
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"""
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Returns all the default attribute values for VPCS.
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:returns: default values (dictionary)
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"""
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vpcs_defaults = {"name": self._name,
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"script_file": self._script_file,
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"console": self._console}
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return vpcs_defaults
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@classmethod
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def reset(cls):
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"""
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Resets allocated instance list.
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"""
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cls._instances.clear()
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cls._allocated_console_ports.clear()
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@property
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def name(self):
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"""
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Returns the name of this VPCS device.
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:returns: name
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"""
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return self._name
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@name.setter
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def name(self, new_name):
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"""
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Sets the name of this VPCS device.
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:param new_name: name
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"""
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if self._script_file:
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# update the startup.vpc
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config_path = os.path.join(self._working_dir, "startup.vpc")
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if os.path.isfile(config_path):
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try:
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with open(config_path, "r+", errors="replace") as f:
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old_config = f.read()
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new_config = old_config.replace(self._name, new_name)
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f.seek(0)
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f.write(new_config)
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except OSError as e:
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raise VPCSError("Could not amend the configuration {}: {}".format(config_path, e))
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log.info("VPCS {name} [id={id}]: renamed to {new_name}".format(name=self._name,
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id=self._id,
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new_name=new_name))
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self._name = new_name
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@asyncio.coroutine
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def _check_vpcs_version(self):
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"""
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Checks if the VPCS executable version is >= 0.5b1.
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"""
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#TODO: should be async
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try:
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output = subprocess.check_output([self._path, "-v"], cwd=self._working_dir)
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match = re.search("Welcome to Virtual PC Simulator, version ([0-9a-z\.]+)", output.decode("utf-8"))
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if match:
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version = match.group(1)
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if parse_version(version) < parse_version("0.5b1"):
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raise VPCSError("VPCS executable version must be >= 0.5b1")
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else:
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raise VPCSError("Could not determine the VPCS version for {}".format(self._path))
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except (OSError, subprocess.SubprocessError) as e:
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raise VPCSError("Error while looking for the VPCS version: {}".format(e))
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@asyncio.coroutine
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def start(self):
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"""
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Starts the VPCS process.
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"""
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if not self.is_running():
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# if not self._ethernet_adapter.get_nio(0):
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# raise VPCSError("This VPCS instance must be connected in order to start")
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self._command = self._build_command()
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try:
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log.info("starting VPCS: {}".format(self._command))
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self._vpcs_stdout_file = os.path.join(self._working_dir, "vpcs.log")
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log.info("logging to {}".format(self._vpcs_stdout_file))
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flags = 0
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if sys.platform.startswith("win32"):
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flags = subprocess.CREATE_NEW_PROCESS_GROUP
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with open(self._vpcs_stdout_file, "w") as fd:
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self._process = yield from asyncio.create_subprocess_exec(*self._command,
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stdout=fd,
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stderr=subprocess.STDOUT,
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cwd=self._working_dir,
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creationflags=flags)
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log.info("VPCS instance {} started PID={}".format(self._id, self._process.pid))
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self._started = True
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except (OSError, subprocess.SubprocessError) as e:
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vpcs_stdout = self.read_vpcs_stdout()
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log.error("could not start VPCS {}: {}\n{}".format(self._path, e, vpcs_stdout))
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raise VPCSError("could not start VPCS {}: {}\n{}".format(self._path, e, vpcs_stdout))
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@asyncio.coroutine
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def stop(self):
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"""
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Stops the VPCS process.
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"""
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# stop the VPCS process
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if self.is_running():
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log.info("stopping VPCS instance {} PID={}".format(self._id, self._process.pid))
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if sys.platform.startswith("win32"):
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self._process.send_signal(signal.CTRL_BREAK_EVENT)
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else:
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self._process.terminate()
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self._process.wait()
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self._process = None
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self._started = False
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def read_vpcs_stdout(self):
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"""
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Reads the standard output of the VPCS process.
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Only use when the process has been stopped or has crashed.
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"""
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output = ""
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if self._vpcs_stdout_file:
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try:
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with open(self._vpcs_stdout_file, errors="replace") as file:
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output = file.read()
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except OSError as e:
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log.warn("could not read {}: {}".format(self._vpcs_stdout_file, e))
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return output
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def is_running(self):
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"""
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Checks if the VPCS process is running
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:returns: True or False
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"""
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if self._process:
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return True
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return False
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def port_add_nio_binding(self, port_id, nio):
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"""
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Adds a port NIO binding.
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:param port_id: port ID
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:param nio: NIO instance to add to the slot/port
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"""
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if not self._ethernet_adapter.port_exists(port_id):
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raise VPCSError("Port {port_id} doesn't exist in adapter {adapter}".format(adapter=self._ethernet_adapter,
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port_id=port_id))
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self._ethernet_adapter.add_nio(port_id, nio)
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log.info("VPCS {name} [id={id}]: {nio} added to port {port_id}".format(name=self._name,
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id=self._id,
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nio=nio,
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port_id=port_id))
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def port_remove_nio_binding(self, port_id):
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"""
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Removes a port NIO binding.
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:param port_id: port ID
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:returns: NIO instance
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"""
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if not self._ethernet_adapter.port_exists(port_id):
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raise VPCSError("Port {port_id} doesn't exist in adapter {adapter}".format(adapter=self._ethernet_adapter,
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port_id=port_id))
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nio = self._ethernet_adapter.get_nio(port_id)
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self._ethernet_adapter.remove_nio(port_id)
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log.info("VPCS {name} [id={id}]: {nio} removed from port {port_id}".format(name=self._name,
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id=self._id,
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nio=nio,
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port_id=port_id))
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return nio
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def _build_command(self):
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"""
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Command to start the VPCS process.
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(to be passed to subprocess.Popen())
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VPCS command line:
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usage: vpcs [options] [scriptfile]
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Option:
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-h print this help then exit
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-v print version information then exit
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-i num number of vpc instances to start (default is 9)
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-p port run as a daemon listening on the tcp 'port'
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-m num start byte of ether address, default from 0
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-r file load and execute script file
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compatible with older versions, DEPRECATED.
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-e tap mode, using /dev/tapx by default (linux only)
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-u udp mode, default
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udp mode options:
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-s port local udp base port, default from 20000
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-c port remote udp base port (dynamips udp port), default from 30000
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-t ip remote host IP, default 127.0.0.1
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tap mode options:
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-d device device name, works only when -i is set to 1
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hypervisor mode option:
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-H port run as the hypervisor listening on the tcp 'port'
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If no 'scriptfile' specified, vpcs will read and execute the file named
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'startup.vpc' if it exsits in the current directory.
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"""
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command = [self._path]
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command.extend(["-p", str(self._console)]) # listen to console port
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nio = self._ethernet_adapter.get_nio(0)
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if nio:
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if isinstance(nio, NIO_UDP):
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# UDP tunnel
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command.extend(["-s", str(nio.lport)]) # source UDP port
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command.extend(["-c", str(nio.rport)]) # destination UDP port
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command.extend(["-t", nio.rhost]) # destination host
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elif isinstance(nio, NIO_TAP):
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# TAP interface
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command.extend(["-e"])
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command.extend(["-d", nio.tap_device])
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command.extend(["-m", str(self._id)]) # the unique ID is used to set the MAC address offset
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command.extend(["-i", "1"]) # option to start only one VPC instance
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command.extend(["-F"]) # option to avoid the daemonization of VPCS
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if self._script_file:
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command.extend([self._script_file])
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return command
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@property
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def script_file(self):
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"""
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Returns the script-file for this VPCS instance.
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:returns: path to script-file
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"""
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return self._script_file
|
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|
|
@script_file.setter
|
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|
|
|
def script_file(self, script_file):
|
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|
|
"""
|
|
|
|
|
Sets the script-file for this VPCS instance.
|
|
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|
|
:param script_file: path to base-script-file
|
|
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|
|
"""
|
|
|
|
|
|
|
|
|
|
self._script_file = script_file
|
|
|
|
|
log.info("VPCS {name} [id={id}]: script_file set to {config}".format(name=self._name,
|
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|
|
id=self._id,
|
|
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|
|
config=self._script_file))
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Julien Duponchelle
9 years ago