mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-28 19:28:07 +00:00
89888ae7bf
Dynamips working directory management Random port selection for the ZeroMQ server TCP & UDP port allocation in a range with improvements Update Dynamips to 0.2.11 (for the tests) Focus on Python3 development (stop trying to be compatible with Python 2.x) More error/bug catching
481 lines
13 KiB
Python
481 lines
13 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013 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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Interface for Dynamips hypervisor management module ("hypervisor")
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http://github.com/GNS3/dynamips/blob/master/README.hypervisor#L46
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"""
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import socket
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import errno
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import re
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import logging
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from .dynamips_error import DynamipsError
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log = logging.getLogger(__name__)
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class DynamipsHypervisor(object):
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"""
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Creates a new connection to a Dynamips server (also called hypervisor)
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:param working_dir: working directory
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:param host: the hostname or ip address string of the Dynamips server
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:param port: the tcp port integer (defaults to 7200)
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:param timeout: timeout integer for how long to wait for a response to commands sent to the
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hypervisor (defaults to 30 seconds)
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"""
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# Used to parse Dynamips response codes
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error_re = re.compile(r"""^2[0-9]{2}-""")
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success_re = re.compile(r"""^1[0-9]{2}\s{1}""")
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def __init__(self, working_dir, host, port=7200, timeout=30.0):
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self._host = host
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self._port = port
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self._devices = []
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self._ghosts = {}
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self._jitsharing_groups = {}
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self._working_dir = working_dir
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self._baseconsole = 2000
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self._baseaux = 2100
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self._baseudp = 10000
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self._current_udp_port = self._baseudp
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self._version = "N/A"
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self._timeout = 30
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self._socket = None
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self._uuid = None
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def connect(self):
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"""
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Connects to the hypervisor.
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"""
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try:
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self._socket = socket.create_connection((self._host,
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self._port),
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self._timeout)
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except socket.error as e:
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raise DynamipsError("Could not connect to server: {}".format(e))
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try:
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self._version = self.send("hypervisor version")[0][4:]
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except IndexError:
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self._version = "Unknown"
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self._uuid = self.send("hypervisor uuid")
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@property
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def version(self):
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"""
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Returns Dynamips version.
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:returns: version string
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"""
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return self._version
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def module_list(self):
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"""
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Returns the modules supported by this hypervisor.
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:returns: module list
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"""
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return self.send("hypervisor module_list")
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def cmd_list(self, module):
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"""
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Returns commands recognized by the specified module.
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:param module: the module name
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:returns: command list
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"""
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return self.send("hypervisor cmd_list {}".format(module))
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def close(self):
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"""
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Closes the connection to this hypervisor (but leave it running).
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"""
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self.send("hypervisor close")
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self._socket.close()
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self._socket = None
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def stop(self):
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"""
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Stops this hypervisor (will no longer run).
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"""
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self.send("hypervisor stop")
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self._socket.close()
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self._socket = None
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def reset(self):
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"""
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Resets this hypervisor (used to get an empty configuration).
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"""
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self.send('hypervisor reset')
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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 this hypervisor.
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:param working_dir: path to the working directory
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"""
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# encase working_dir in quotes to protect spaces in the path
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self.send("hypervisor working_dir {}".format('"' + working_dir + '"'))
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self._working_dir = working_dir
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log.debug("working directory set to {}".format(self._working_dir))
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def save_config(self, filename):
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"""
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Saves the configuration of all Dynamips instances into the specified file.
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:param filename: path string
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"""
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# encase working_dir in quotes to protect spaces in the path
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self.send("hypervisor save_config {}".format('"' + filename + '"'))
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@property
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def uuid(self):
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"""
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Returns this hypervisor UUID.
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:Returns: uuid string
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"""
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return self._uuid
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@property
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def socket(self):
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"""
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Returns the current socket used to communicate with this hypervisor.
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:returns: socket instance
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"""
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assert self._socket
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return self._socket
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@property
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def devices(self):
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"""
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Returns the list of devices managed by this hypervisor instance.
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:returns: a list of device instances
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"""
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return self._devices
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@devices.setter
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def devices(self, devices):
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"""
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Sets the list of devices managed by this hypervisor instance.
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This method is for internal use.
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:param devices: a list of device objects
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"""
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self._devices = devices
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@property
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def baseconsole(self):
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"""
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Returns base console TCP port for this hypervisor.
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:returns: base console value (integer)
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"""
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return self._baseconsole
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@baseconsole.setter
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def baseconsole(self, baseconsole):
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"""
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Sets the base console TCP port for this hypervisor.
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:param baseconsole: base console value (integer)
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"""
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self._baseconsole = baseconsole
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@property
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def baseaux(self):
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"""
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Returns base auxiliary port for this hypervisor.
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:returns: base auxiliary port value (integer)
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"""
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return self._baseaux
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@baseaux.setter
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def baseaux(self, baseaux):
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"""
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Sets the base auxiliary TCP port for this hypervisor.
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:param baseaux: base auxiliary port value (integer)
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"""
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self._baseaux = baseaux
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@property
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def baseudp(self):
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"""
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Returns the next available UDP port for UDP NIOs.
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:returns: base UDP port value (integer)
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"""
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return self._baseudp
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@baseudp.setter
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def baseudp(self, baseudp):
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"""
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Sets the next open UDP port for NIOs for this hypervisor.
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:param baseudp: base UDP port value (integer)
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"""
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self._baseudp = baseudp
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self._current_udp_port = self._baseudp
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#FIXME
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log.info("hypervisor a new base UDP {}".format(self._baseudp))
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@property
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def ghosts(self):
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"""
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Returns a list of the ghosts hosted by this hypervisor.
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:returns: Ghosts dict (image_name -> device)
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"""
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return self._ghosts
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def add_ghost(self, image_name, router):
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"""
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Adds a ghost name to the list of ghosts created on this hypervisor.
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:param image_name: name of the ghost image
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:param router: Router instance
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"""
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self._ghosts[image_name] = router
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@property
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def jitsharing_groups(self):
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"""
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Returns a list of the JIT sharing groups hosted by this hypervisor.
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:returns: JIT sharing groups dict (image_name -> group number)
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"""
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return self._jitsharing_groups
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def add_jitsharing_group(self, image_name, group_number):
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"""
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Adds a JIT blocks sharing group name to the list of groups created on this hypervisor.
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:param image_name: name of the ghost image
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:param group_number: group (integer)
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"""
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self._jitsharing_groups[image_name] = group_number
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@property
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def host(self):
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"""
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Returns this hypervisor host.
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:returns: host (string)
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"""
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return self._host
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@property
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def port(self):
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"""
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Returns this hypervisor port.
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:returns: port (integer)
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"""
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return self._port
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@staticmethod
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def find_unused_port(start_port, end_port, host='127.0.0.1', socket_type="TCP"):
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"""
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Finds an unused port in a range.
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:param start_port: first port in the range
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:param end_port: last port in the range
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:param host: host/address for bind()
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:param socket_type: TCP (default) or UDP
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"""
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if socket_type == "UDP":
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socket_type = socket.SOCK_DGRAM
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else:
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socket_type = socket.SOCK_STREAM
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for port in range(start_port, end_port):
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if port > end_port:
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raise DynamipsError("Could not find a free port between {0} and {1}".format(start_port, end_port))
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try:
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if ":" in host:
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# IPv6 address support
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s = socket.socket(socket.AF_INET6, socket_type)
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else:
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s = socket.socket(socket.AF_INET, socket_type)
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# the port is available if bind is a success
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s.bind((host, port))
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return port
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except socket.error as e:
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if e.errno == errno.EADDRINUSE: # socket already in use
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continue
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else:
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raise DynamipsError("Could not find an unused port: {}".format(e))
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def allocate_udp_port(self, max_port=100):
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"""
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Allocates a new UDP port for creating an UDP NIO.
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:param max_port: maximum number of port to scan in
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order to find one available for use.
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:returns: port number (integer)
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"""
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start_port = self._current_udp_port
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end_port = start_port + max_port
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allocated_port = DynamipsHypervisor.find_unused_port(start_port, end_port, self._host, socket_type="UDP")
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if allocated_port - self._current_udp_port > 1:
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self._current_udp_port += allocated_port - self._current_udp_port
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else:
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self._current_udp_port += 1
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return allocated_port
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def send_raw(self, string):
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"""
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Sends a raw command to this hypervisor. Use sparingly.
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:param string: command string.
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:returns: command result (string)
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"""
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result = self.send(string)
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return result
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def send(self, command):
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"""
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Sends commands to this hypervisor.
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:param command: a Dynamips hypervisor command
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:returns: results as a list
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"""
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# Dynamips responses are of the form:
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# 1xx yyyyyy\r\n
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# 1xx yyyyyy\r\n
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# ...
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# 100-yyyy\r\n
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# or
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# 2xx-yyyy\r\n
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#
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# Where 1xx is a code from 100-199 for a success or 200-299 for an error
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# The result might be multiple lines and might be less than the buffer size
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# but still have more data. The only thing we know for sure is the last line
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# will begin with '100-' or a '2xx-' and end with '\r\n'
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if not self._socket:
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raise DynamipsError("Not connected")
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try:
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command = command.strip() + '\n'
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log.debug("sending {}".format(command))
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self.socket.sendall(command.encode('utf-8'))
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except socket.error as e:
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raise DynamipsError("Lost communication with {host}:{port} :{error}"
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.format(host=self._host, port=self._port, error=e))
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# Now retrieve the result
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data = []
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buf = ''
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while True:
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try:
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chunk = self.socket.recv(1024) # match to Dynamips' buffer size
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buf += chunk.decode("utf-8")
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except socket.error as e:
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raise DynamipsError("Communication timed out with {host}:{port} :{error}"
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.format(host=self._host, port=self._port, error=e))
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# If the buffer doesn't end in '\n' then we can't be done
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try:
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if buf[-1] != '\n':
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continue
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except IndexError:
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raise DynamipsError("Could not communicate with {host}:{port}"
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.format(host=self._host, port=self._port))
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data += buf.split('\r\n')
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if data[-1] == '':
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data.pop()
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buf = ''
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if len(data) == 0:
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raise DynamipsError("no data returned from {host}:{port}"
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.format(host=self._host, port=self._port))
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# Does it contain an error code?
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if self.error_re.search(data[-1]):
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raise DynamipsError(data[-1][4:])
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# Or does the last line begin with '100-'? Then we are done!
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if data[-1][:4] == '100-':
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data[-1] = data[-1][4:]
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if data[-1] == 'OK':
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data.pop()
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break
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# Remove success responses codes
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for index in range(len(data)):
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if self.success_re.search(data[index]):
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data[index] = data[index][4:]
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log.debug("returned result {}".format(data))
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return data
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