gns3-server/gns3server/modules/dynamips/__init__.py

# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
Dynamips server module.
"""

import aiohttp
import sys
import os
import shutil
import socket
import time
import asyncio
import logging

log = logging.getLogger(__name__)

from gns3server.utils.interfaces import get_windows_interfaces
from pkg_resources import parse_version
from ..base_manager import BaseManager
from .dynamips_error import DynamipsError
from .hypervisor import Hypervisor
from .nodes.router import Router
from .dynamips_vm import DynamipsVM

# NIOs
from .nios.nio_udp import NIOUDP
from .nios.nio_udp_auto import NIOUDPAuto
from .nios.nio_unix import NIOUNIX
from .nios.nio_vde import NIOVDE
from .nios.nio_tap import NIOTAP
from .nios.nio_generic_ethernet import NIOGenericEthernet
from .nios.nio_linux_ethernet import NIOLinuxEthernet
from .nios.nio_fifo import NIOFIFO
from .nios.nio_mcast import NIOMcast
from .nios.nio_null import NIONull


class Dynamips(BaseManager):

    _VM_CLASS = DynamipsVM

    def __init__(self):

        super().__init__()
        self._dynamips_path = None

        # FIXME: temporary
        self._working_dir = "/tmp"

    @asyncio.coroutine
    def unload(self):

        yield from BaseManager.unload(self)
        Router.reset()

#         files = glob.glob(os.path.join(self._working_dir, "dynamips", "*.ghost"))
#         files += glob.glob(os.path.join(self._working_dir, "dynamips", "*_lock"))
#         files += glob.glob(os.path.join(self._working_dir, "dynamips", "ilt_*"))
#         files += glob.glob(os.path.join(self._working_dir, "dynamips", "c[0-9][0-9][0-9][0-9]_*_rommon_vars"))
#         files += glob.glob(os.path.join(self._working_dir, "dynamips", "c[0-9][0-9][0-9][0-9]_*_ssa"))
#         for file in files:
#             try:
#                 log.debug("deleting file {}".format(file))
#                 os.remove(file)
#             except OSError as e:
#                 log.warn("could not delete file {}: {}".format(file, e))
#                 continue

    @property
    def dynamips_path(self):
        """
        Returns the path to Dynamips.

        :returns: path
        """

        return self._dynamips_path

    def find_dynamips(self):

        # look for Dynamips
        dynamips_path = self.config.get_section_config("Dynamips").get("dynamips_path")
        if not dynamips_path:
            dynamips_path = shutil.which("dynamips")

        if not dynamips_path:
            raise DynamipsError("Could not find Dynamips")
        if not os.path.isfile(dynamips_path):
            raise DynamipsError("Dynamips {} is not accessible".format(dynamips_path))
        if not os.access(dynamips_path, os.X_OK):
            raise DynamipsError("Dynamips is not executable")

        self._dynamips_path = dynamips_path
        return dynamips_path

    @asyncio.coroutine
    def _wait_for_hypervisor(self, host, port, timeout=10.0):
        """
        Waits for an hypervisor to be started (accepting a socket connection)

        :param host: host/address to connect to the hypervisor
        :param port: port to connect to the hypervisor
        """

        begin = time.time()
        connection_success = False
        last_exception = None
        while time.time() - begin < timeout:
            yield from asyncio.sleep(0.01)
            try:
                _, writer = yield from asyncio.open_connection(host, port)
                writer.close()
            except OSError as e:
                last_exception = e
                continue
            connection_success = True
            break

        if not connection_success:
            raise DynamipsError("Couldn't connect to hypervisor on {}:{} :{}".format(host, port, last_exception))
        else:
            log.info("Dynamips server ready after {:.4f} seconds".format(time.time() - begin))

    @asyncio.coroutine
    def start_new_hypervisor(self):
        """
        Creates a new Dynamips process and start it.

        :returns: the new hypervisor instance
        """

        if not self._dynamips_path:
            self.find_dynamips()

        try:
            # let the OS find an unused port for the Dynamips hypervisor
            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
                sock.bind(("127.0.0.1", 0))
                port = sock.getsockname()[1]
        except OSError as e:
            raise DynamipsError("Could not find free port for the Dynamips hypervisor: {}".format(e))

        hypervisor = Hypervisor(self._dynamips_path, self._working_dir, "127.0.0.1", port)

        log.info("Ceating new hypervisor {}:{} with working directory {}".format(hypervisor.host, hypervisor.port, self._working_dir))
        yield from hypervisor.start()

        yield from self._wait_for_hypervisor("127.0.0.1", port)
        log.info("Hypervisor {}:{} has successfully started".format(hypervisor.host, hypervisor.port))

        yield from hypervisor.connect()
        if parse_version(hypervisor.version) < parse_version('0.2.11'):
            raise DynamipsError("Dynamips version must be >= 0.2.11, detected version is {}".format(hypervisor.version))

        return hypervisor

    def create_nio(self, executable, nio_settings):
        """
        Creates a new NIO.

        :param nio_settings: information to create the NIO

        :returns: a NIO object
        """

        nio = None
        if nio_settings["type"] == "nio_udp":
            lport = nio_settings["lport"]
            rhost = nio_settings["rhost"]
            rport = nio_settings["rport"]
            try:
                # TODO: handle IPv6
                with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock:
                    sock.connect((rhost, rport))
            except OSError as e:
                raise aiohttp.web.HTTPInternalServerError(text="Could not create an UDP connection to {}:{}: {}".format(rhost, rport, e))
            nio = NIOUDP(lport, rhost, rport)
        elif nio_settings["type"] == "nio_tap":
            tap_device = nio_settings["tap_device"]
            if not self._has_privileged_access(executable):
                raise aiohttp.web.HTTPForbidden(text="{} has no privileged access to {}.".format(executable, tap_device))
            nio = NIOTAP(tap_device)
        assert nio is not None
        return nio

    def create_nio(self, node, nio_settings):
        """
        Creates a new NIO.

        :param node: Dynamips node instance
        :param nio_settings: information to create the NIO

        :returns: a NIO object
        """

        nio = None
        if nio_settings["type"] == "nio_udp":
            lport = nio_settings["lport"]
            rhost = nio_settings["rhost"]
            rport = nio_settings["rport"]
            try:
                # TODO: handle IPv6
                with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock:
                    sock.connect((rhost, rport))
            except OSError as e:
                raise DynamipsError("Could not create an UDP connection to {}:{}: {}".format(rhost, rport, e))
            # check if we have an allocated NIO UDP auto
            nio = node.hypervisor.get_nio_udp_auto(lport)
            if not nio:
                # otherwise create an NIO UDP
                nio = NIOUDP(node.hypervisor, lport, rhost, rport)
            else:
                nio.connect(rhost, rport)
        elif nio_settings["type"] == "nio_generic_ethernet":
            ethernet_device = nio_settings["ethernet_device"]
            if sys.platform.startswith("win"):
                # replace the interface name by the GUID on Windows
                interfaces = get_windows_interfaces()
                npf_interface = None
                for interface in interfaces:
                    if interface["name"] == ethernet_device:
                        npf_interface = interface["id"]
                if not npf_interface:
                    raise DynamipsError("Could not find interface {} on this host".format(ethernet_device))
                else:
                    ethernet_device = npf_interface
            nio = NIOGenericEthernet(node.hypervisor, ethernet_device)
        elif nio_settings["type"] == "nio_linux_ethernet":
            if sys.platform.startswith("win"):
                raise DynamipsError("This NIO type is not supported on Windows")
            ethernet_device = nio_settings["ethernet_device"]
            nio = NIOLinuxEthernet(node.hypervisor, ethernet_device)
        elif nio_settings["type"] == "nio_tap":
            tap_device = nio_settings["tap_device"]
            nio = NIOTAP(node.hypervisor, tap_device)
        elif nio_settings["type"] == "nio_unix":
            local_file = nio_settings["local_file"]
            remote_file = nio_settings["remote_file"]
            nio = NIOUNIX(node.hypervisor, local_file, remote_file)
        elif nio_settings["type"] == "nio_vde":
            control_file = nio_settings["control_file"]
            local_file = nio_settings["local_file"]
            nio = NIOVDE(node.hypervisor, control_file, local_file)
        elif nio_settings["type"] == "nio_null":
            nio = NIONull(node.hypervisor)
        return nio

#     def set_ghost_ios(self, router):
#         """
#         Manages Ghost IOS support.
#
#         :param router: Router instance
#         """
#
#         if not router.mmap:
#             raise DynamipsError("mmap support is required to enable ghost IOS support")
#
#         ghost_instance = router.formatted_ghost_file()
#         all_ghosts = []
#
#         # search of an existing ghost instance across all hypervisors
#         for hypervisor in self._hypervisor_manager.hypervisors:
#             all_ghosts.extend(hypervisor.ghosts)
#
#         if ghost_instance not in all_ghosts:
#             # create a new ghost IOS instance
#             ghost = Router(router.hypervisor, "ghost-" + ghost_instance, router.platform, ghost_flag=True)
#             ghost.image = router.image
#             # for 7200s, the NPE must be set when using an NPE-G2.
#             if router.platform == "c7200":
#                 ghost.npe = router.npe
#             ghost.ghost_status = 1
#             ghost.ghost_file = ghost_instance
#             ghost.ram = router.ram
#             try:
#                 ghost.start()
#                 ghost.stop()
#             except DynamipsError:
#                 raise
#             finally:
#                 ghost.clean_delete()
#
#         if router.ghost_file != ghost_instance:
#             # set the ghost file to the router
#             router.ghost_status = 2
#             router.ghost_file = ghost_instance
#
#     def create_config_from_file(self, local_base_config, router, destination_config_path):
#         """
#         Creates a config file from a local base config
#
#         :param local_base_config: path the a local base config
#         :param router: router instance
#         :param destination_config_path: path to the destination config file
#
#         :returns: relative path to the created config file
#         """
#
#         log.info("creating config file {} from {}".format(destination_config_path, local_base_config))
#         config_path = destination_config_path
#         config_dir = os.path.dirname(destination_config_path)
#         try:
#             os.makedirs(config_dir)
#         except FileExistsError:
#             pass
#         except OSError as e:
#             raise DynamipsError("Could not create configs directory: {}".format(e))
#
#         try:
#             with open(local_base_config, "r", errors="replace") as f:
#                 config = f.read()
#             with open(config_path, "w") as f:
#                 config = "!\n" + config.replace("\r", "")
#                 config = config.replace('%h', router.name)
#                 f.write(config)
#         except OSError as e:
#             raise DynamipsError("Could not save the configuration from {} to {}: {}".format(local_base_config, config_path, e))
#         return "configs" + os.sep + os.path.basename(config_path)
#
#     def create_config_from_base64(self, config_base64, router, destination_config_path):
#         """
#         Creates a config file from a base64 encoded config.
#
#         :param config_base64: base64 encoded config
#         :param router: router instance
#         :param destination_config_path: path to the destination config file
#
#         :returns: relative path to the created config file
#         """
#
#         log.info("creating config file {} from base64".format(destination_config_path))
#         config = base64.decodebytes(config_base64.encode("utf-8")).decode("utf-8")
#         config = "!\n" + config.replace("\r", "")
#         config = config.replace('%h', router.name)
#         config_dir = os.path.dirname(destination_config_path)
#         try:
#             os.makedirs(config_dir)
#         except FileExistsError:
#             pass
#         except OSError as e:
#             raise DynamipsError("Could not create configs directory: {}".format(e))
#
#         config_path = destination_config_path
#         try:
#             with open(config_path, "w") as f:
#                 log.info("saving startup-config to {}".format(config_path))
#                 f.write(config)
#         except OSError as e:
#             raise DynamipsError("Could not save the configuration {}: {}".format(config_path, e))
#         return "configs" + os.sep + os.path.basename(config_path)