2014-05-06 16:06:10 +00:00
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# -*- 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 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 re
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import signal
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import subprocess
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import argparse
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import threading
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import configparser
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2014-05-12 14:16:37 +00:00
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import sys
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import socket
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2014-05-06 16:06:10 +00:00
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from .vpcs_error import VPCSError
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2014-05-06 16:25:05 +00:00
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from .adapters.ethernet_adapter import EthernetAdapter
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2014-05-06 16:06:10 +00:00
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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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import logging
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log = logging.getLogger(__name__)
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class VPCSDevice(object):
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"""
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VPCS device implementation.
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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 host: host/address to bind for console and UDP connections
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:param name: name of this VPCS device
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"""
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_instances = []
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def __init__(self, path, working_dir, host="127.0.0.1", name=None):
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2014-05-12 14:16:37 +00:00
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# find an instance identifier (1 <= id <= 255)
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2014-05-06 16:06:10 +00:00
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# This 255 limit is due to a restriction on the number of possible
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# mac addresses given in VPCS using the -m option
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self._id = 0
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2014-05-12 14:16:37 +00:00
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for identifier in range(1, 256):
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2014-05-06 16:06:10 +00:00
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if identifier not in self._instances:
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self._id = identifier
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self._instances.append(self._id)
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break
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if self._id == 0:
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raise VPCSError("Maximum number of VPCS instances reached")
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if name:
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self._name = name
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else:
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self._name = "VPCS{}".format(self._id)
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self._path = path
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self._console = None
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self._working_dir = None
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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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2014-05-12 14:16:37 +00:00
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self._host = "127.0.0.1"
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2014-05-06 16:06:10 +00:00
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self._started = False
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# VPCS settings
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self._script_file = ""
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2014-05-06 16:25:05 +00:00
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self._ethernet_adapters = [EthernetAdapter()] # one adapter = 1 interfaces
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self._slots = self._ethernet_adapters
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2014-05-06 16:06:10 +00:00
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# update the working directory
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self.working_dir = working_dir
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log.info("VPCS device {name} [id={id}] has been created".format(name=self._name,
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id=self._id))
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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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"path": self._path,
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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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@property
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def id(self):
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"""
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Returns the unique ID for this VPCS device.
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:returns: id (integer)
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"""
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return(self._id)
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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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@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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self._name = new_name
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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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@property
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def path(self):
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"""
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Returns the path to the VPCS executable.
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:returns: path to VPCS
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"""
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return(self._path)
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@path.setter
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def path(self, path):
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"""
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Sets the path to the VPCS executable.
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:param path: path to VPCS
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"""
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self._path = path
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log.info("VPCS {name} [id={id}]: path changed to {path}".format(name=self._name,
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id=self._id,
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path=path))
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@property
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def working_dir(self):
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"""
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Returns current working directory
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:returns: path to the working directory
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"""
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return self._working_dir
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@working_dir.setter
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def working_dir(self, working_dir):
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"""
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Sets the working directory for VPCS.
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:param working_dir: path to the working directory
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"""
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# create our own working directory
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working_dir = os.path.join(working_dir, "vpcs", "device-{}".format(self._id))
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try:
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os.makedirs(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(working_dir, e))
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self._working_dir = working_dir
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log.info("VPCS {name} [id={id}]: working directory changed to {wd}".format(name=self._name,
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id=self._id,
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wd=self._working_dir))
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@property
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def console(self):
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"""
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Returns the TCP console port.
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:returns: console port (integer)
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"""
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return self._console
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@console.setter
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def console(self, console):
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"""
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Sets the TCP console port.
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:param console: console port (integer)
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"""
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self._console = console
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log.info("VPCS {name} [id={id}]: console port set to {port}".format(name=self._name,
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id=self._id,
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port=console))
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def command(self):
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"""
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Returns the VPCS command line.
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:returns: VPCS command line (string)
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"""
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return " ".join(self._build_command())
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def delete(self):
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"""
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Deletes this VPCS device.
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"""
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self.stop()
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self._instances.remove(self._id)
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log.info("VPCS device {name} [id={id}] has been deleted".format(name=self._name,
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id=self._id))
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@property
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def started(self):
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"""
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Returns either this VPCS device has been started or not.
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:returns: boolean
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"""
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return self._started
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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 os.path.isfile(self._path):
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raise VPCSError("VPCS image '{}' 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 image '{}' is not executable".format(self._path))
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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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with open(self._vpcs_stdout_file, "w") as fd:
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self._process = subprocess.Popen(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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log.info("VPCS instance {} started PID={}".format(self._id, self._process.pid))
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self._started = True
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except FileNotFoundError as e:
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raise VPCSError("could not start VPCS: {}: 32-bit binary support is probably not installed".format(e))
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except OSError 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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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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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect((self._host, self._console))
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sock.send(bytes("quit\n", 'UTF-8'))
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sock.close()
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except TypeError as e:
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log.warn("VPCS instance {} PID={} is still running. Error: {}".format(self._id,
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self._process.pid, e))
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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) 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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2014-05-12 14:16:37 +00:00
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if self._process:
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect((self._host, self._console))
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sock.close()
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return True
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except:
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e = sys.exc_info()[0]
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log.warn("Could not connect to {}:{}. Error: {}".format(self._host, self._console, e))
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return False
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2014-05-06 16:06:10 +00:00
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return False
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def slot_add_nio_binding(self, slot_id, port_id, nio):
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"""
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Adds a slot NIO binding.
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:param slot_id: slot ID
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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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try:
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adapter = self._slots[slot_id]
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except IndexError:
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raise VPCSError("Slot {slot_id} doesn't exist on VPCS {name}".format(name=self._name,
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slot_id=slot_id))
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if not adapter.port_exists(port_id):
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raise VPCSError("Port {port_id} doesn't exist in adapter {adapter}".format(adapter=adapter,
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port_id=port_id))
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adapter.add_nio(port_id, nio)
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log.info("VPCS {name} [id={id}]: {nio} added to {slot_id}/{port_id}".format(name=self._name,
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id=self._id,
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nio=nio,
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slot_id=slot_id,
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port_id=port_id))
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def slot_remove_nio_binding(self, slot_id, port_id):
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"""
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Removes a slot NIO binding.
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:param slot_id: slot ID
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:param port_id: port ID
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"""
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try:
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adapter = self._slots[slot_id]
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except IndexError:
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raise VPCSError("Slot {slot_id} doesn't exist on VPCS {name}".format(name=self._name,
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slot_id=slot_id))
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if not adapter.port_exists(port_id):
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raise VPCSError("Port {port_id} doesn't exist in adapter {adapter}".format(adapter=adapter,
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port_id=port_id))
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nio = adapter.get_nio(port_id)
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adapter.remove_nio(port_id)
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log.info("VPCS {name} [id={id}]: {nio} removed from {slot_id}/{port_id}".format(name=self._name,
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id=self._id,
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nio=nio,
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slot_id=slot_id,
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port_id=port_id))
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|
def _build_command(self):
|
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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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|
-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 (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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|
|
|
hypervisor mode option:
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|
|
-H port run as the hypervisor listening on the tcp 'port'
|
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|
|
|
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|
|
If no 'scriptfile' specified, vpcs will read and execute the file named
|
|
|
|
'startup.vpc' if it exsits in the current directory.
|
|
|
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|
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|
"""
|
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|
|
|
command = [self._path]
|
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|
|
command.extend(["-p", str(self._console)])
|
2014-05-06 16:25:05 +00:00
|
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|
|
for adapter in self._slots:
|
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|
|
for unit in adapter.ports.keys():
|
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|
|
nio = adapter.get_nio(unit)
|
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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)])
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|
|
command.extend(["-c", str(nio.rport)])
|
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|
|
command.extend(["-t", str(nio.rhost)])
|
2014-05-06 16:42:38 +00:00
|
|
|
|
|
|
|
elif isinstance(nio, NIO_TAP):
|
|
|
|
# TAP interface
|
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|
|
command.extend(["-e"]) #, str(nio.tap_device)]) #TODO: Fix, currently vpcs doesn't allow specific tap_device
|
|
|
|
|
2014-05-06 16:06:10 +00:00
|
|
|
command.extend(["-m", str(self._id)]) #The unique ID is used to set the mac address offset
|
2014-05-06 16:52:34 +00:00
|
|
|
command.extend(["-i", str(1)]) #Option to start only one pc instance
|
2014-05-06 16:06:10 +00:00
|
|
|
if self._script_file:
|
|
|
|
command.extend([self._script_file])
|
|
|
|
return command
|
|
|
|
|
|
|
|
@property
|
|
|
|
def script_file(self):
|
|
|
|
"""
|
2014-05-06 16:52:34 +00:00
|
|
|
Returns the script-file for this VPCS instance.
|
2014-05-06 16:06:10 +00:00
|
|
|
|
2014-05-06 16:52:34 +00:00
|
|
|
:returns: path to script-file file
|
2014-05-06 16:06:10 +00:00
|
|
|
"""
|
|
|
|
|
|
|
|
return self._script_file
|
|
|
|
|
|
|
|
@script_file.setter
|
|
|
|
def script_file(self, script_file):
|
|
|
|
"""
|
2014-05-06 16:52:34 +00:00
|
|
|
Sets the script-file for this VPCS instance.
|
2014-05-06 16:06:10 +00:00
|
|
|
|
2014-05-06 16:52:34 +00:00
|
|
|
:param script_file: path to script-file file
|
2014-05-06 16:06:10 +00:00
|
|
|
"""
|
|
|
|
|
|
|
|
self._script_file = script_file
|
|
|
|
log.info("VPCS {name} [id={id}]: script_file set to {config}".format(name=self._name,
|
|
|
|
id=self._id,
|
|
|
|
config=self._script_file))
|
|
|
|
|
|
|
|
|