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Joe Bowen 2014-05-06 10:08:16 -06:00
parent ec08a5a72a
commit 975e5db82f
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690
gns3server/modules/vpcs/__init__.py~
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2014 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/>.
"""
VPCS server module.
"""
import os
import sys
import base64
import tempfile
import fcntl
import struct
import socket
import shutil
from gns3server.modules import IModule
from gns3server.config import Config
import gns3server.jsonrpc as jsonrpc
from .vpcs_device import VPCSDevice
from .vpcs_error import VPCSError
from .nios.nio_udp import NIO_UDP
from .nios.nio_tap import NIO_TAP
from ..attic import find_unused_port
from .schemas import VPCS_CREATE_SCHEMA
from .schemas import VPCS_DELETE_SCHEMA
from .schemas import VPCS_UPDATE_SCHEMA
from .schemas import VPCS_START_SCHEMA
from .schemas import VPCS_STOP_SCHEMA
from .schemas import VPCS_RELOAD_SCHEMA
from .schemas import VPCS_ALLOCATE_UDP_PORT_SCHEMA
from .schemas import VPCS_ADD_NIO_SCHEMA
from .schemas import VPCS_DELETE_NIO_SCHEMA
import logging
log = logging.getLogger(__name__)
class VPCS(IModule):
"""
VPCS module.
:param name: module name
:param args: arguments for the module
:param kwargs: named arguments for the module
"""
def __init__(self, name, *args, **kwargs):
# get the VPCS location
config = Config.instance()
VPCS_config = config.get_section_config(name.upper())
self._VPCS = VPCS_config.get("VPCS")
if not self._VPCS or not os.path.isfile(self._VPCS):
VPCS_in_cwd = os.path.join(os.getcwd(), "VPCS")
if os.path.isfile(VPCS_in_cwd):
self._VPCS = VPCS_in_cwd
else:
# look for VPCS if none is defined or accessible
for path in os.environ["PATH"].split(":"):
try:
if "VPCS" in os.listdir(path) and os.access(os.path.join(path, "VPCS"), os.X_OK):
self._VPCS = os.path.join(path, "VPCS")
break
except OSError:
continue
if not self._VPCS:
log.warning("VPCS binary couldn't be found!")
elif not os.access(self._VPCS, os.X_OK):
log.warning("VPCS is not executable")
# a new process start when calling IModule
IModule.__init__(self, name, *args, **kwargs)
self._VPCS_instances = {}
self._console_start_port_range = 4001
self._console_end_port_range = 4512
self._allocated_console_ports = []
self._current_console_port = self._console_start_port_range
self._udp_start_port_range = 30001
self._udp_end_port_range = 40001
self._current_udp_port = self._udp_start_port_range
self._host = kwargs["host"]
self._projects_dir = kwargs["projects_dir"]
self._tempdir = kwargs["temp_dir"]
self._working_dir = self._projects_dir
self._VPCSrc = ""
# check every 5 seconds
self._VPCS_callback = self.add_periodic_callback(self._check_VPCS_is_alive, 5000)
self._VPCS_callback.start()
def stop(self, signum=None):
"""
Properly stops the module.
:param signum: signal number (if called by the signal handler)
"""
self._VPCS_callback.stop()
# delete all VPCS instances
for VPCS_id in self._VPCS_instances:
VPCS_instance = self._VPCS_instances[VPCS_id]
VPCS_instance.delete()
IModule.stop(self, signum) # this will stop the I/O loop
def _check_VPCS_is_alive(self):
"""
Periodic callback to check if VPCS and VPCS are alive
for each VPCS instance.
Sends a notification to the client if not.
"""
for VPCS_id in self._VPCS_instances:
VPCS_instance = self._VPCS_instances[VPCS_id]
if VPCS_instance.started and (not VPCS_instance.is_running() or not VPCS_instance.is_VPCS_running()):
notification = {"module": self.name,
"id": VPCS_id,
"name": VPCS_instance.name}
if not VPCS_instance.is_running():
stdout = VPCS_instance.read_VPCS_stdout()
notification["message"] = "VPCS has stopped running"
notification["details"] = stdout
self.send_notification("{}.VPCS_stopped".format(self.name), notification)
elif not VPCS_instance.is_VPCS_running():
stdout = VPCS_instance.read_VPCS_stdout()
notification["message"] = "VPCS has stopped running"
notification["details"] = stdout
self.send_notification("{}.VPCS_stopped".format(self.name), notification)
VPCS_instance.stop()
def get_VPCS_instance(self, VPCS_id):
"""
Returns an VPCS device instance.
:param VPCS_id: VPCS device identifier
:returns: VPCSDevice instance
"""
if VPCS_id not in self._VPCS_instances:
log.debug("VPCS device ID {} doesn't exist".format(VPCS_id), exc_info=1)
self.send_custom_error("VPCS device ID {} doesn't exist".format(VPCS_id))
return None
return self._VPCS_instances[VPCS_id]
@IModule.route("VPCS.reset")
def reset(self, request):
"""
Resets the module.
:param request: JSON request
"""
# delete all VPCS instances
for VPCS_id in self._VPCS_instances:
VPCS_instance = self._VPCS_instances[VPCS_id]
VPCS_instance.delete()
# resets the instance IDs
VPCSDevice.reset()
self._VPCS_instances.clear()
self._remote_server = False
self._current_console_port = self._console_start_port_range
self._current_udp_port = self._udp_start_port_range
if self._VPCSrc and os.path.isfile(self._VPCSrc):
try:
log.info("deleting VPCSrc file {}".format(self._VPCSrc))
os.remove(self._VPCSrc)
except OSError as e:
log.warn("could not delete VPCSrc file {}: {}".format(self._VPCSrc, e))
log.info("VPCS module has been reset")
@IModule.route("VPCS.settings")
def settings(self, request):
"""
Set or update settings.
Optional request parameters:
- working_dir (path to a working directory)
- project_name
- console_start_port_range
- console_end_port_range
- udp_start_port_range
- udp_end_port_range
:param request: JSON request
"""
if request == None:
self.send_param_error()
return
if "VPCS" in request and request["VPCS"]:
self._VPCS = request["VPCS"]
log.info("VPCS path set to {}".format(self._VPCS))
if "working_dir" in request:
new_working_dir = request["working_dir"]
log.info("this server is local with working directory path to {}".format(new_working_dir))
else:
new_working_dir = os.path.join(self._projects_dir, request["project_name"] + ".gns3")
log.info("this server is remote with working directory path to {}".format(new_working_dir))
if self._projects_dir != self._working_dir != new_working_dir:
if not os.path.isdir(new_working_dir):
try:
shutil.move(self._working_dir, new_working_dir)
except OSError as e:
log.error("could not move working directory from {} to {}: {}".format(self._working_dir,
new_working_dir,
e))
return
# update the working directory if it has changed
if self._working_dir != new_working_dir:
self._working_dir = new_working_dir
for VPCS_id in self._VPCS_instances:
VPCS_instance = self._VPCS_instances[VPCS_id]
VPCS_instance.working_dir = self._working_dir
if "console_start_port_range" in request and "console_end_port_range" in request:
self._console_start_port_range = request["console_start_port_range"]
self._console_end_port_range = request["console_end_port_range"]
if "udp_start_port_range" in request and "udp_end_port_range" in request:
self._udp_start_port_range = request["udp_start_port_range"]
self._udp_end_port_range = request["udp_end_port_range"]
log.debug("received request {}".format(request))
def test_result(self, message, result="error"):
"""
"""
return {"result": result, "message": message}
@IModule.route("VPCS.test_settings")
def test_settings(self, request):
"""
"""
response = []
self.send_response(response)
@IModule.route("VPCS.create")
def VPCS_create(self, request):
"""
Creates a new VPCS instance.
Mandatory request parameters:
- path (path to the VPCS executable)
Optional request parameters:
- name (VPCS name)
Response parameters:
- id (VPCS instance identifier)
- name (VPCS name)
- default settings
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_CREATE_SCHEMA):
return
name = None
if "name" in request:
name = request["name"]
VPCS_path = request["path"]
try:
try:
os.makedirs(self._working_dir)
except FileExistsError:
pass
except OSError as e:
raise VPCSError("Could not create working directory {}".format(e))
VPCS_instance = VPCSDevice(VPCS_path, self._working_dir, host=self._host, name=name)
# find a console port
if self._current_console_port > self._console_end_port_range:
self._current_console_port = self._console_start_port_range
try:
VPCS_instance.console = find_unused_port(self._current_console_port, self._console_end_port_range, self._host)
except Exception as e:
raise VPCSError(e)
self._current_console_port += 1
except VPCSError as e:
self.send_custom_error(str(e))
return
response = {"name": VPCS_instance.name,
"id": VPCS_instance.id}
defaults = VPCS_instance.defaults()
response.update(defaults)
self._VPCS_instances[VPCS_instance.id] = VPCS_instance
self.send_response(response)
@IModule.route("VPCS.delete")
def VPCS_delete(self, request):
"""
Deletes an VPCS instance.
Mandatory request parameters:
- id (VPCS instance identifier)
Response parameter:
- True on success
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_DELETE_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
try:
VPCS_instance.delete()
del self._VPCS_instances[request["id"]]
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response(True)
@IModule.route("VPCS.update")
def VPCS_update(self, request):
"""
Updates an VPCS instance
Mandatory request parameters:
- id (VPCS instance identifier)
Optional request parameters:
- any setting to update
- startup_config_base64 (startup-config base64 encoded)
Response parameters:
- updated settings
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_UPDATE_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
response = {}
try:
# a new startup-config has been pushed
if "startup_config_base64" in request:
config = base64.decodestring(request["startup_config_base64"].encode("utf-8")).decode("utf-8")
config = "!\n" + config.replace("\r", "")
config = config.replace('%h', VPCS_instance.name)
config_path = os.path.join(VPCS_instance.working_dir, "startup-config")
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 VPCSError("Could not save the configuration {}: {}".format(config_path, e))
# update the request with the new local startup-config path
request["startup_config"] = os.path.basename(config_path)
except VPCSError as e:
self.send_custom_error(str(e))
return
# update the VPCS settings
for name, value in request.items():
if hasattr(VPCS_instance, name) and getattr(VPCS_instance, name) != value:
try:
setattr(VPCS_instance, name, value)
response[name] = value
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response(response)
@IModule.route("VPCS.start")
def vm_start(self, request):
"""
Starts an VPCS instance.
Mandatory request parameters:
- id (VPCS instance identifier)
Response parameters:
- True on success
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_START_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
try:
log.debug("starting VPCS with command: {}".format(VPCS_instance.command()))
VPCS_instance.VPCS = self._VPCS
VPCS_instance.VPCSrc = self._VPCSrc
VPCS_instance.start()
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response(True)
@IModule.route("VPCS.stop")
def vm_stop(self, request):
"""
Stops an VPCS instance.
Mandatory request parameters:
- id (VPCS instance identifier)
Response parameters:
- True on success
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_STOP_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
try:
VPCS_instance.stop()
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response(True)
@IModule.route("VPCS.reload")
def vm_reload(self, request):
"""
Reloads an VPCS instance.
Mandatory request parameters:
- id (VPCS identifier)
Response parameters:
- True on success
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_RELOAD_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
try:
if VPCS_instance.is_running():
VPCS_instance.stop()
VPCS_instance.start()
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response(True)
@IModule.route("VPCS.allocate_udp_port")
def allocate_udp_port(self, request):
"""
Allocates a UDP port in order to create an UDP NIO.
Mandatory request parameters:
- id (VPCS identifier)
- port_id (unique port identifier)
Response parameters:
- port_id (unique port identifier)
- lport (allocated local port)
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_ALLOCATE_UDP_PORT_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
try:
# find a UDP port
if self._current_udp_port >= self._udp_end_port_range:
self._current_udp_port = self._udp_start_port_range
try:
port = find_unused_port(self._current_udp_port, self._udp_end_port_range, host=self._host, socket_type="UDP")
except Exception as e:
raise VPCSError(e)
self._current_udp_port += 1
log.info("{} [id={}] has allocated UDP port {} with host {}".format(VPCS_instance.name,
VPCS_instance.id,
port,
self._host))
response = {"lport": port}
except VPCSError as e:
self.send_custom_error(str(e))
return
response["port_id"] = request["port_id"]
self.send_response(response)
def _check_for_privileged_access(self, device):
"""
Check if VPCS can access Ethernet and TAP devices.
:param device: device name
"""
# we are root, so VPCS should have privileged access too
if os.geteuid() == 0:
return
# test if VPCS has the CAP_NET_RAW capability
if "security.capability" in os.listxattr(self._VPCS):
try:
caps = os.getxattr(self._VPCS, "security.capability")
# test the 2nd byte and check if the 13th bit (CAP_NET_RAW) is set
if struct.unpack("<IIIII", caps)[1] & 1 << 13:
return
except Exception as e:
log.error("could not determine if CAP_NET_RAW capability is set for {}: {}".format(self._VPCS, e))
return
raise VPCSError("{} has no privileged access to {}.".format(self._VPCS, device))
@IModule.route("VPCS.add_nio")
def add_nio(self, request):
"""
Adds an NIO (Network Input/Output) for an VPCS instance.
Mandatory request parameters:
- id (VPCS instance identifier)
- slot (slot number)
- port (port number)
- port_id (unique port identifier)
- nio (one of the following)
- type "nio_udp"
- lport (local port)
- rhost (remote host)
- rport (remote port)
- type "nio_tap"
- tap_device (TAP device name e.g. tap0)
Response parameters:
- port_id (unique port identifier)
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_ADD_NIO_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
slot = request["slot"]
port = request["port"]
try:
nio = None
if request["nio"]["type"] == "nio_udp":
lport = request["nio"]["lport"]
rhost = request["nio"]["rhost"]
rport = request["nio"]["rport"]
nio = NIO_UDP(lport, rhost, rport)
elif request["nio"]["type"] == "nio_tap":
tap_device = request["nio"]["tap_device"]
self._check_for_privileged_access(tap_device)
nio = NIO_TAP(tap_device)
if not nio:
raise VPCSError("Requested NIO does not exist or is not supported: {}".format(request["nio"]["type"]))
except VPCSError as e:
self.send_custom_error(str(e))
return
try:
VPCS_instance.slot_add_nio_binding(slot, port, nio)
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response({"port_id": request["port_id"]})
@IModule.route("VPCS.delete_nio")
def delete_nio(self, request):
"""
Deletes an NIO (Network Input/Output).
Mandatory request parameters:
- id (VPCS instance identifier)
- slot (slot identifier)
- port (port identifier)
Response parameters:
- True on success
:param request: JSON request
"""
# validate the request
if not self.validate_request(request, VPCS_DELETE_NIO_SCHEMA):
return
# get the instance
VPCS_instance = self.get_VPCS_instance(request["id"])
if not VPCS_instance:
return
slot = request["slot"]
port = request["port"]
try:
VPCS_instance.slot_remove_nio_binding(slot, port)
except VPCSError as e:
self.send_custom_error(str(e))
return
self.send_response(True)
@IModule.route("VPCS.echo")
def echo(self, request):
"""
Echo end point for testing purposes.
:param request: JSON request
"""
if request == None:
self.send_param_error()
else:
log.debug("received request {}".format(request))
self.send_response(request)

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gns3server/modules/vpcs/nios/nio_tap.py~
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 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/>.
"""
Interface for TAP NIOs (UNIX based OSes only).
"""
class NIO_TAP(object):
"""
IOU TAP NIO.
:param tap_device: TAP device name (e.g. tap0)
"""
def __init__(self, tap_device):
self._tap_device = tap_device
@property
def tap_device(self):
"""
Returns the TAP device used by this NIO.
:returns: the TAP device name
"""
return self._tap_device
def __str__(self):
return "NIO TAP"

46
gns3server/modules/vpcs/nios/nio_tap.py~~
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 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/>.
"""
Interface for TAP NIOs (UNIX based OSes only).
"""
class NIO_TAP(object):
"""
IOU TAP NIO.
:param tap_device: TAP device name (e.g. tap0)
"""
def __init__(self, tap_device):
self._tap_device = tap_device
@property
def tap_device(self):
"""
Returns the TAP device used by this NIO.
:returns: the TAP device name
"""
return self._tap_device
def __str__(self):
return "NIO TAP"

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gns3server/modules/vpcs/nios/nio_udp.py~
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 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/>.
"""
Interface for UDP NIOs.
"""
class NIO_UDP(object):
"""
IOU UDP NIO.
:param lport: local port number
:param rhost: remote address/host
:param rport: remote port number
"""
_instance_count = 0
def __init__(self, lport, rhost, rport):
self._lport = lport
self._rhost = rhost
self._rport = rport
@property
def lport(self):
"""
Returns the local port
:returns: local port number
"""
return self._lport
@property
def rhost(self):
"""
Returns the remote host
:returns: remote address/host
"""
return self._rhost
@property
def rport(self):
"""
Returns the remote port
:returns: remote port number
"""
return self._rport
def __str__(self):
return "NIO UDP"

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gns3server/modules/vpcs/schemas.py~
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2014 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/>.
VPCS_CREATE_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to create a new VPCS instance",
"type": "object",
"properties": {
"name": {
"description": "VPCS device name",
"type": "string",
"minLength": 1,
},
"path": {
"description": "path to the VPCS executable",
"type": "string",
"minLength": 1,
}
},
"required": ["path"]
}
VPCS_DELETE_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to delete an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
},
"required": ["id"]
}
VPCS_UPDATE_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to update an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
"name": {
"description": "VPCS device name",
"type": "string",
"minLength": 1,
},
"path": {
"description": "path to the VPCS executable",
"type": "string",
"minLength": 1,
},
"startup_config": {
"description": "path to the VPCS startup configuration file",
"type": "string",
"minLength": 1,
},
"startup_config_base64": {
"description": "startup configuration base64 encoded",
"type": "string"
},
},
"required": ["id"]
}
VPCS_START_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to start an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
},
"required": ["id"]
}
VPCS_STOP_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to stop an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
},
"required": ["id"]
}
VPCS_RELOAD_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to reload an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
},
"required": ["id"]
}
VPCS_ALLOCATE_UDP_PORT_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to allocate an UDP port for an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
"port_id": {
"description": "Unique port identifier for the VPCS instance",
"type": "integer"
},
},
"required": ["id", "port_id"]
}
VPCS_ADD_NIO_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to add a NIO for an VPCS instance",
"type": "object",
"definitions": {
"UDP": {
"description": "UDP Network Input/Output",
"properties": {
"type": {
"enum": ["nio_udp"]
},
"lport": {
"description": "Local port",
"type": "integer",
"minimum": 1,
"maximum": 65535
},
"rhost": {
"description": "Remote host",
"type": "string",
"minLength": 1
},
"rport": {
"description": "Remote port",
"type": "integer",
"minimum": 1,
"maximum": 65535
}
},
"required": ["type", "lport", "rhost", "rport"],
"additionalProperties": False
},
"Ethernet": {
"description": "Generic Ethernet Network Input/Output",
"properties": {
"type": {
"enum": ["nio_generic_ethernet"]
},
"ethernet_device": {
"description": "Ethernet device name e.g. eth0",
"type": "string",
"minLength": 1
},
},
"required": ["type", "ethernet_device"],
"additionalProperties": False
},
"LinuxEthernet": {
"description": "Linux Ethernet Network Input/Output",
"properties": {
"type": {
"enum": ["nio_linux_ethernet"]
},
"ethernet_device": {
"description": "Ethernet device name e.g. eth0",
"type": "string",
"minLength": 1
},
},
"required": ["type", "ethernet_device"],
"additionalProperties": False
},
"TAP": {
"description": "TAP Network Input/Output",
"properties": {
"type": {
"enum": ["nio_tap"]
},
"tap_device": {
"description": "TAP device name e.g. tap0",
"type": "string",
"minLength": 1
},
},
"required": ["type", "tap_device"],
"additionalProperties": False
},
"UNIX": {
"description": "UNIX Network Input/Output",
"properties": {
"type": {
"enum": ["nio_unix"]
},
"local_file": {
"description": "path to the UNIX socket file (local)",
"type": "string",
"minLength": 1
},
"remote_file": {
"description": "path to the UNIX socket file (remote)",
"type": "string",
"minLength": 1
},
},
"required": ["type", "local_file", "remote_file"],
"additionalProperties": False
},
"VDE": {
"description": "VDE Network Input/Output",
"properties": {
"type": {
"enum": ["nio_vde"]
},
"control_file": {
"description": "path to the VDE control file",
"type": "string",
"minLength": 1
},
"local_file": {
"description": "path to the VDE control file",
"type": "string",
"minLength": 1
},
},
"required": ["type", "control_file", "local_file"],
"additionalProperties": False
},
"NULL": {
"description": "NULL Network Input/Output",
"properties": {
"type": {
"enum": ["nio_null"]
},
},
"required": ["type"],
"additionalProperties": False
},
},
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
"port_id": {
"description": "Unique port identifier for the VPCS instance",
"type": "integer"
},
"nio": {
"type": "object",
"description": "Network Input/Output",
"oneOf": [
{"$ref": "#/definitions/UDP"},
{"$ref": "#/definitions/Ethernet"},
{"$ref": "#/definitions/LinuxEthernet"},
{"$ref": "#/definitions/TAP"},
{"$ref": "#/definitions/UNIX"},
{"$ref": "#/definitions/VDE"},
{"$ref": "#/definitions/NULL"},
]
},
},
"required": ["id", "port_id", "nio"]
}
VPCS_DELETE_NIO_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Request validation to delete a NIO for an VPCS instance",
"type": "object",
"properties": {
"id": {
"description": "VPCS device instance ID",
"type": "integer"
},
},
"required": ["id"]
}

471
gns3server/modules/vpcs/vpcs_device.py~
View File

@ -1,471 +0,0 @@
# -*- coding: utf-8 -*-
#
# Copyright (C) 2014 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/>.
"""
VPCS device management (creates command line, processes, files etc.) in
order to run an VPCS instance.
"""
import os
import re
import signal
import subprocess
import argparse
import threading
import configparser
from .vpcscon import start_vpcscon
from .vpcs_error import VPCSError
from .nios.nio_udp import NIO_UDP
from .nios.nio_tap import NIO_TAP
import logging
log = logging.getLogger(__name__)
class VPCSDevice(object):
"""
VPCS device implementation.
:param path: path to VPCS executable
:param working_dir: path to a working directory
:param host: host/address to bind for console and UDP connections
:param name: name of this VPCS device
"""
_instances = []
def __init__(self, path, working_dir, host="127.0.0.1", name=None):
# find an instance identifier (0 <= id < 255)
# This 255 limit is due to a restriction on the number of possible
# mac addresses given in VPCS using the -m option
self._id = 0
for identifier in range(0, 255):
if identifier not in self._instances:
self._id = identifier
self._instances.append(self._id)
break
if self._id == 0:
raise VPCSError("Maximum number of VPCS instances reached")
if name:
self._name = name
else:
self._name = "VPCS{}".format(self._id)
self._path = path
self._console = None
self._working_dir = None
self._command = []
self._process = None
self._vpcs_stdout_file = ""
self._vpcscon_thead = None
self._vpcscon_thread_stop_event = None
self._host = host
self._started = False
# VPCS settings
self._script_file = ""
# update the working directory
self.working_dir = working_dir
log.info("VPCS device {name} [id={id}] has been created".format(name=self._name,
id=self._id))
def defaults(self):
"""
Returns all the default attribute values for VPCS.
:returns: default values (dictionary)
"""
vpcs_defaults = {"name": self._name,
"path": self._path,
"script_file": self._script_file,
"console": self._console}
return vpcs_defaults
@property
def id(self):
"""
Returns the unique ID for this VPCS device.
:returns: id (integer)
"""
return(self._id)
@classmethod
def reset(cls):
"""
Resets allocated instance list.
"""
cls._instances.clear()
@property
def name(self):
"""
Returns the name of this VPCS device.
:returns: name
"""
return self._name
@name.setter
def name(self, new_name):
"""
Sets the name of this VPCS device.
:param new_name: name
"""
self._name = new_name
log.info("VPCS {name} [id={id}]: renamed to {new_name}".format(name=self._name,
id=self._id,
new_name=new_name))
@property
def path(self):
"""
Returns the path to the VPCS executable.
:returns: path to VPCS
"""
return(self._path)
@path.setter
def path(self, path):
"""
Sets the path to the VPCS executable.
:param path: path to VPCS
"""
self._path = path
log.info("VPCS {name} [id={id}]: path changed to {path}".format(name=self._name,
id=self._id,
path=path))
@property
def working_dir(self):
"""
Returns current working directory
:returns: path to the working directory
"""
return self._working_dir
@working_dir.setter
def working_dir(self, working_dir):
"""
Sets the working directory for VPCS.
:param working_dir: path to the working directory
"""
# create our own working directory
working_dir = os.path.join(working_dir, "vpcs", "device-{}".format(self._id))
try:
os.makedirs(working_dir)
except FileExistsError:
pass
except OSError as e:
raise VPCSError("Could not create working directory {}: {}".format(working_dir, e))
self._working_dir = working_dir
log.info("VPCS {name} [id={id}]: working directory changed to {wd}".format(name=self._name,
id=self._id,
wd=self._working_dir))
@property
def console(self):
"""
Returns the TCP console port.
:returns: console port (integer)
"""
return self._console
@console.setter
def console(self, console):
"""
Sets the TCP console port.
:param console: console port (integer)
"""
self._console = console
log.info("VPCS {name} [id={id}]: console port set to {port}".format(name=self._name,
id=self._id,
port=console))
def command(self):
"""
Returns the VPCS command line.
:returns: VPCS command line (string)
"""
return " ".join(self._build_command())
def delete(self):
"""
Deletes this VPCS device.
"""
self.stop()
self._instances.remove(self._id)
log.info("VPCS device {name} [id={id}] has been deleted".format(name=self._name,
id=self._id))
@property
def started(self):
"""
Returns either this VPCS device has been started or not.
:returns: boolean
"""
return self._started
def _start_vpcscon(self):
"""
Starts vpcscon thread (for console connections).
"""
if not self._vpcscon_thead:
telnet_server = "{}:{}".format(self._host, self._console)
log.info("starting vpcscon for VPCS instance {} to accept Telnet connections on {}".format(self._name, telnet_server))
args = argparse.Namespace(appl_id=str(self._id), debug=False, escape='^^', telnet_limit=0, telnet_server=telnet_server)
self._vpcscon_thread_stop_event = threading.Event()
self._vpcscon_thead = threading.Thread(target=start_vpcscon, args=(args, self._vpcscon_thread_stop_event))
self._vpcscon_thead.start() ", ".join(missing_libs)))
def start(self):
"""
Starts the VPCS process.
"""
if not self.is_running():
if not os.path.isfile(self._path):
raise VPCSError("VPCS image '{}' is not accessible".format(self._path))
if not os.access(self._path, os.X_OK):
raise VPCSError("VPCS image '{}' is not executable".format(self._path))
self._command = self._build_command()
try:
log.info("starting VPCS: {}".format(self._command))
self._vpcs_stdout_file = os.path.join(self._working_dir, "vpcs.log")
log.info("logging to {}".format(self._vpcs_stdout_file))
with open(self._vpcs_stdout_file, "w") as fd:
self._process = subprocess.Popen(self._command,
stdout=fd,
stderr=subprocess.STDOUT,
cwd=self._working_dir)
log.info("VPCS instance {} started PID={}".format(self._id, self._process.pid))
self._started = True
except FileNotFoundError as e:
raise VPCSError("could not start VPCS: {}: 32-bit binary support is probably not installed".format(e))
except OSError as e:
vpcs_stdout = self.read_vpcs_stdout()
log.error("could not start VPCS {}: {}\n{}".format(self._path, e, vpcs_stdout))
raise VPCSError("could not start VPCS {}: {}\n{}".format(self._path, e, vpcs_stdout))
# start console support
self._start_vpcscon()
def stop(self):
"""
Stops the VPCS process.
"""
# stop the VPCS process
if self.is_running():
log.info("stopping VPCS instance {} PID={}".format(self._id, self._process.pid))
try:
self._process.terminate()
self._process.wait(1)
except subprocess.TimeoutExpired:
self._process.kill()
if self._process.poll() == None:
log.warn("VPCS instance {} PID={} is still running".format(self._id,
self._process.pid))
self._process = None
self._started = False
# stop console support
if self._vpcscon_thead:
self._vpcscon_thread_stop_event.set()
if self._vpcscon_thead.is_alive():
self._vpcscon_thead.join(timeout=0.10)
self._vpcscon_thead = None
def read_vpcs_stdout(self):
"""
Reads the standard output of the VPCS process.
Only use when the process has been stopped or has crashed.
"""
output = ""
if self._vpcs_stdout_file:
try:
with open(self._vpcs_stdout_file) as file:
output = file.read()
except OSError as e:
log.warn("could not read {}: {}".format(self._vpcs_stdout_file, e))
return output
def is_running(self):
"""
Checks if the VPCS process is running
:returns: True or False
"""
if self._process and self._process.poll() == None:
return True
return False
def slot_add_nio_binding(self, slot_id, port_id, nio):
"""
Adds a slot NIO binding.
:param slot_id: slot ID
:param port_id: port ID
:param nio: NIO instance to add to the slot/port
"""
try:
adapter = self._slots[slot_id]
except IndexError:
raise VPCSError("Slot {slot_id} doesn't exist on VPCS {name}".format(name=self._name,
slot_id=slot_id))
if not adapter.port_exists(port_id):
raise VPCSError("Port {port_id} doesn't exist in adapter {adapter}".format(adapter=adapter,
port_id=port_id))
adapter.add_nio(port_id, nio)
log.info("VPCS {name} [id={id}]: {nio} added to {slot_id}/{port_id}".format(name=self._name,
id=self._id,
nio=nio,
slot_id=slot_id,
port_id=port_id))
def slot_remove_nio_binding(self, slot_id, port_id):
"""
Removes a slot NIO binding.
:param slot_id: slot ID
:param port_id: port ID
"""
try:
adapter = self._slots[slot_id]
except IndexError:
raise VPCSError("Slot {slot_id} doesn't exist on VPCS {name}".format(name=self._name,
slot_id=slot_id))
if not adapter.port_exists(port_id):
raise VPCSError("Port {port_id} doesn't exist in adapter {adapter}".format(adapter=adapter,
port_id=port_id))
nio = adapter.get_nio(port_id)
adapter.remove_nio(port_id)
log.info("VPCS {name} [id={id}]: {nio} removed from {slot_id}/{port_id}".format(name=self._name,
id=self._id,
nio=nio,
slot_id=slot_id,
port_id=port_id))
def _build_command(self):
"""
Command to start the VPCS process.
(to be passed to subprocess.Popen())
VPCS command line:
usage: vpcs [options] [scriptfile]
Option:
-h print this help then exit
-v print version information then exit
-p port run as a daemon listening on the tcp 'port'
-m num start byte of ether address, default from 0
-r file load and execute script file
compatible with older versions, DEPRECATED.
-e tap mode, using /dev/tapx (linux only)
-u udp mode, default
udp mode options:
-s port local udp base port, default from 20000
-c port remote udp base port (dynamips udp port), default from 30000
-t ip remote host IP, default 127.0.0.1
hypervisor mode option:
-H port run as the hypervisor listening on the tcp 'port'
If no 'scriptfile' specified, vpcs will read and execute the file named
'startup.vpc' if it exsits in the current directory.
"""
command = [self._path]
command.extend(["-p", str(self._tcpport)])
command.extend(["-s", str(self._lport)])
command.extend(["-c", str(self._rport)])
command.extend(["-t", str(self._rhost)])
command.extend(["-m", str(self._id)]) #The unique ID is used to set the mac address offset
if self._script_file:
command.extend([self._script_file])
return command
@property
def script_file(self):
"""
Returns the startup-config for this VPCS instance.
:returns: path to startup-config file
"""
return self._script_file
@script_file.setter
def script_file(self, script_file):
"""
Sets the startup-config for this VPCS instance.
:param script_file: path to startup-config file
"""
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))

39
gns3server/modules/vpcs/vpcs_error.py~
View File

@ -1,39 +0,0 @@
# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 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/>.
"""
Custom exceptions for VPCS module.
"""
class IOUError(Exception):
def __init__(self, message, original_exception=None):
Exception.__init__(self, message)
if isinstance(message, Exception):
message = str(message)
self._message = message
self._original_exception = original_exception
def __repr__(self):
return self._message
def __str__(self):
return self._message

642
gns3server/modules/vpcs/vpcscon.py~
View File

@ -1,642 +0,0 @@
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2013, 2014 James E. Carpenter
#
# 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/>.
#
import socket
import sys
import os
import select
import fcntl
import struct
import termios
import tty
import time
import argparse
import traceback
import logging
log = logging.getLogger(__name__)
# Escape characters
ESC_CHAR = '^^' # can be overriden from command line
ESC_QUIT = 'q'
# IOU seems to only send *1* byte at a time. If
# they ever fix that we'll be ready for it.
BUFFER_SIZE = 1024
# How long to wait before retrying a connection (seconds)
RETRY_DELAY = 3
# How often to test an idle connection (seconds)
POLL_TIMEOUT = 3
EXIT_SUCCESS = 0
EXIT_FAILURE = 1
EXIT_ABORT = 2
# Mostly from:
# https://code.google.com/p/miniboa/source/browse/trunk/miniboa/telnet.py
#--[ Telnet Commands ]---------------------------------------------------------
SE = 240 # End of subnegotiation parameters
NOP = 241 # No operation
DATMK = 242 # Data stream portion of a sync.
BREAK = 243 # NVT Character BRK
IP = 244 # Interrupt Process
AO = 245 # Abort Output
AYT = 246 # Are you there
EC = 247 # Erase Character
EL = 248 # Erase Line
GA = 249 # The Go Ahead Signal
SB = 250 # Sub-option to follow
WILL = 251 # Will; request or confirm option begin
WONT = 252 # Wont; deny option request
DO = 253 # Do = Request or confirm remote option
DONT = 254 # Don't = Demand or confirm option halt
IAC = 255 # Interpret as Command
SEND = 1 # Sub-process negotiation SEND command
IS = 0 # Sub-process negotiation IS command
#--[ Telnet Options ]----------------------------------------------------------
BINARY = 0 # Transmit Binary
ECHO = 1 # Echo characters back to sender
RECON = 2 # Reconnection
SGA = 3 # Suppress Go-Ahead
TMARK = 6 # Timing Mark
TTYPE = 24 # Terminal Type
NAWS = 31 # Negotiate About Window Size
LINEMO = 34 # Line Mode
class FileLock:
# struct flock { /* from fcntl(2) */
# ...
# short l_type; /* Type of lock: F_RDLCK,
# F_WRLCK, F_UNLCK */
# short l_whence; /* How to interpret l_start:
# SEEK_SET, SEEK_CUR, SEEK_END */
# off_t l_start; /* Starting offset for lock */
# off_t l_len; /* Number of bytes to lock */
# pid_t l_pid; /* PID of process blocking our lock
# (F_GETLK only) */
# ...
# };
_flock = struct.Struct('hhqql')
def __init__(self, fname=None):
self.fd = None
self.fname = fname
def get_lock(self):
flk = self._flock.pack(fcntl.F_WRLCK, os.SEEK_SET,
0, 0, os.getpid())
flk = self._flock.unpack(
fcntl.fcntl(self.fd, fcntl.F_GETLK, flk))
# If it's not locked (or is locked by us) then return None,
# otherwise return the PID of the owner.
if flk[0] == fcntl.F_UNLCK:
return None
return flk[4]
def lock(self):
try:
self.fd = open('{}.lck'.format(self.fname), 'a')
except Exception as e:
raise LockError("Couldn't get lock on {}: {}"
.format(self.fname, e))
flk = self._flock.pack(fcntl.F_WRLCK, os.SEEK_SET, 0, 0, 0)
try:
fcntl.fcntl(self.fd, fcntl.F_SETLK, flk)
except BlockingIOError:
raise LockError("Already connected. PID {} has lock on {}"
.format(self.get_lock(), self.fname))
# If we got here then we must have the lock. Store the PID.
self.fd.truncate(0)
self.fd.write('{}\n'.format(os.getpid()))
self.fd.flush()
def unlock(self):
if self.fd:
# Deleting first prevents a race condition
os.unlink(self.fd.name)
self.fd.close()
def __enter__(self):
self.lock()
def __exit__(self, exc_type, exc_val, exc_tb):
self.unlock()
return False
class Console:
def fileno(self):
raise NotImplementedError("Only routers have fileno()")
class Router:
pass
class TTY(Console):
def read(self, fileno, bufsize):
return self.fd.read(bufsize)
def write(self, buf):
return self.fd.write(buf)
def register(self, epoll):
self.epoll = epoll
epoll.register(self.fd, select.EPOLLIN | select.EPOLLET)
def __enter__(self):
try:
self.fd = open('/dev/tty', 'r+b', buffering=0)
except OSError as e:
raise TTYError("Couldn't open controlling TTY: {}".format(e))
# Save original flags
self.termios = termios.tcgetattr(self.fd)
self.fcntl = fcntl.fcntl(self.fd, fcntl.F_GETFL)
# Update flags
tty.setraw(self.fd, termios.TCSANOW)
fcntl.fcntl(self.fd, fcntl.F_SETFL, self.fcntl | os.O_NONBLOCK)
return self
def __exit__(self, exc_type, exc_val, exc_tb):
# Restore flags to original settings
termios.tcsetattr(self.fd, termios.TCSANOW, self.termios)
fcntl.fcntl(self.fd, fcntl.F_SETFL, self.fcntl)
self.fd.close()
return False
class TelnetServer(Console):
def __init__(self, addr, port, stop_event):
self.addr = addr
self.port = port
self.fd_dict = {}
self.stop_event = stop_event
def read(self, fileno, bufsize):
# Someone wants to connect?
if fileno == self.sock_fd.fileno():
self._accept()
return None
self._cur_fileno = fileno
# Read a maximum of _bufsize_ bytes without blocking. When it
# would want to block it means there's no more data. An empty
# buffer normally means that we've been disconnected.
try:
buf = self._read_cur(bufsize, socket.MSG_DONTWAIT)
except BlockingIOError:
return None
if not buf:
self._disconnect(fileno)
# Process and remove any telnet commands from the buffer
if IAC in buf:
buf = self._IAC_parser(buf)
return buf
def write(self, buf):
for fd in self.fd_dict.values():
fd.send(buf)
def register(self, epoll):
self.epoll = epoll
epoll.register(self.sock_fd, select.EPOLLIN)
def _read_block(self, bufsize):
buf = self._read_cur(bufsize, socket.MSG_WAITALL)
# If we don't get everything we were looking for then the
# client probably disconnected.
if len(buf) < bufsize:
self._disconnect(self._cur_fileno)
return buf
def _read_cur(self, bufsize, flags):
return self.fd_dict[self._cur_fileno].recv(bufsize, flags)
def _write_cur(self, buf):
return self.fd_dict[self._cur_fileno].send(buf)
def _IAC_parser(self, buf):
skip_to = 0
while not self.stop_event.is_set():
# Locate an IAC to process
iac_loc = buf.find(IAC, skip_to)
if iac_loc < 0:
break
# Get the TELNET command
iac_cmd = bytearray([IAC])
try:
iac_cmd.append(buf[iac_loc + 1])
except IndexError:
buf.extend(self._read_block(1))
iac_cmd.append(buf[iac_loc + 1])
# Is this just a 2-byte TELNET command?
if iac_cmd[1] not in [WILL, WONT, DO, DONT]:
if iac_cmd[1] == AYT:
log.debug("Telnet server received Are-You-There (AYT)")
self._write_cur(
b'\r\nYour Are-You-There received. I am here.\r\n'
)
elif iac_cmd[1] == IAC:
# It's data, not an IAC
iac_cmd.pop()
# This prevents the 0xff from being
# interputed as yet another IAC
skip_to = iac_loc + 1
log.debug("Received IAC IAC")
elif iac_cmd[1] == NOP:
pass
else:
log.debug("Unhandled telnet command: "
"{0:#x} {1:#x}".format(*iac_cmd))
# This must be a 3-byte TELNET command
else:
try:
iac_cmd.append(buf[iac_loc + 2])
except IndexError:
buf.extend(self._read_block(1))
iac_cmd.append(buf[iac_loc + 2])
# We do ECHO, SGA, and BINARY. Period.
if (iac_cmd[1] == DO
and iac_cmd[2] not in [ECHO, SGA, BINARY]):
self._write_cur(bytes([IAC, WONT, iac_cmd[2]]))
log.debug("Telnet WON'T {:#x}".format(iac_cmd[2]))
else:
log.debug("Unhandled telnet command: "
"{0:#x} {1:#x} {2:#x}".format(*iac_cmd))
# Remove the entire TELNET command from the buffer
buf = buf.replace(iac_cmd, b'', 1)
# Return the new copy of the buffer, minus telnet commands
return buf
def _accept(self):
fd, addr = self.sock_fd.accept()
self.fd_dict[fd.fileno()] = fd
self.epoll.register(fd, select.EPOLLIN | select.EPOLLET)
log.info("Telnet connection from {}:{}".format(addr[0], addr[1]))
# This is a one-way negotiation. This is very basic so there
# shouldn't be any problems with any decent client.
fd.send(bytes([IAC, WILL, ECHO,
IAC, WILL, SGA,
IAC, WILL, BINARY,
IAC, DO, BINARY]))
if args.telnet_limit and len(self.fd_dict) > args.telnet_limit:
fd.send(b'\r\nToo many connections\r\n')
self._disconnect(fd.fileno())
log.warn("Client disconnected because of too many connections. "
"(limit currently {})".format(args.telnet_limit))
def _disconnect(self, fileno):
fd = self.fd_dict.pop(fileno)
log.info("Telnet client disconnected")
fd.shutdown(socket.SHUT_RDWR)
fd.close()
def __enter__(self):
# Open a socket and start listening
sock_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock_fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
sock_fd.bind((self.addr, self.port))
except OSError:
raise TelnetServerError("Cannot bind to {}:{}"
.format(self.addr, self.port))
sock_fd.listen(socket.SOMAXCONN)
self.sock_fd = sock_fd
log.info("Telnet server ready for connections on {}:{}".format(self.addr, self.port))
return self
def __exit__(self, exc_type, exc_val, exc_tb):
for fileno in list(self.fd_dict.keys()):
self._disconnect(fileno)
self.sock_fd.close()
return False
class IOU(Router):
def __init__(self, ttyC, ttyS, stop_event):
self.ttyC = ttyC
self.ttyS = ttyS
self.stop_event = stop_event
def read(self, bufsize):
try:
buf = self.fd.recv(bufsize)
except BlockingIOError:
return None
return buf
def write(self, buf):
self.fd.send(buf)
def _open(self):
self.fd = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
self.fd.setblocking(False)
def _bind(self):
try:
os.unlink(self.ttyC)
except FileNotFoundError:
pass
except Exception as e:
raise NetioError("Couldn't unlink socket {}: {}"
.format(self.ttyC, e))
try:
self.fd.bind(self.ttyC)
except Exception as e:
raise NetioError("Couldn't create socket {}: {}"
.format(self.ttyC, e))
def _connect(self):
# Keep trying until we connect or die trying
while not self.stop_event.is_set():
try:
self.fd.connect(self.ttyS)
except FileNotFoundError:
log.debug("Waiting to connect to {}".format(self.ttyS))
time.sleep(RETRY_DELAY)
except Exception as e:
raise NetioError("Couldn't connect to socket {}: {}"
.format(self.ttyS, e))
else:
break
def register(self, epoll):
self.epoll = epoll
epoll.register(self.fd, select.EPOLLIN | select.EPOLLET)
def fileno(self):
return self.fd.fileno()
def __enter__(self):
self._open()
self._bind()
self._connect()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
os.unlink(self.ttyC)
self.fd.close()
return False
class IOUConError(Exception):
pass
class LockError(IOUConError):
pass
class NetioError(IOUConError):
pass
class TTYError(IOUConError):
pass
class TelnetServerError(IOUConError):
pass
class ConfigError(IOUConError):
pass
def mkdir_netio(netio_dir):
try:
os.mkdir(netio_dir)
except FileExistsError:
pass
except Exception as e:
raise NetioError("Couldn't create directory {}: {}"
.format(netio_dir, e))
def send_recv_loop(console, router, esc_char, stop_event):
epoll = select.epoll()
router.register(epoll)
console.register(epoll)
router_fileno = router.fileno()
esc_quit = bytes(ESC_QUIT.upper(), 'ascii')
esc_state = False
while not stop_event.is_set():
event_list = epoll.poll(timeout=POLL_TIMEOUT)
# When/if the poll times out we send an empty datagram. If IOU
# has gone away then this will toss a ConnectionRefusedError
# exception.
if not event_list:
router.write(b'')
continue
for fileno, event in event_list:
buf = bytearray()
# IOU --> tty(s)
if fileno == router_fileno:
while not stop_event.is_set():
data = router.read(BUFFER_SIZE)
if not data:
break
buf.extend(data)
console.write(buf)
# tty --> IOU
else:
while not stop_event.is_set():
data = console.read(fileno, BUFFER_SIZE)
if not data:
break
buf.extend(data)
# If we just received the escape character then
# enter the escape state.
#
# If we are in the escape state then check for a
# quit command. Or if it's the escape character then
# send the escape character. Else, send the escape
# character we ate earlier and whatever character we
# just got. Exit escape state.
#
# If we're not in the escape state and this isn't an
# escape character then just send it to IOU.
if esc_state:
if buf.upper() == esc_quit:
sys.exit(EXIT_SUCCESS)
elif buf == esc_char:
router.write(esc_char)
else:
router.write(esc_char)
router.write(buf)
esc_state = False
elif buf == esc_char:
esc_state = True
else:
router.write(buf)
def get_args():
parser = argparse.ArgumentParser(
description='Connect to an IOU console port.')
parser.add_argument('-d', '--debug', action='store_true',
help='display some debugging information')
parser.add_argument('-e', '--escape',
help='set escape character (default: %(default)s)',
default=ESC_CHAR, metavar='CHAR')
parser.add_argument('-t', '--telnet-server',
help='start telnet server listening on ADDR:PORT',
metavar='ADDR:PORT', default=False)
parser.add_argument('-l', '--telnet-limit',
help='maximum number of simultaneous '
'telnet connections (default: %(default)s)',
metavar='LIMIT', type=int, default=1)
parser.add_argument('appl_id', help='IOU instance identifier')
return parser.parse_args()
def get_escape_character(escape):
# Figure out the escape character to use.
# Can be any ASCII character or a spelled out control
# character, like "^e". The string "none" disables it.
if escape.lower() == 'none':
esc_char = b''
elif len(escape) == 2 and escape[0] == '^':
c = ord(escape[1].upper()) - 0x40
if not 0 <= c <= 0x1f: # control code range
raise ConfigError("Invalid control code")
esc_char = bytes([c])
elif len(escape) == 1:
try:
esc_char = bytes(escape, 'ascii')
except ValueError as e:
raise ConfigError("Invalid escape character") from e
else:
raise ConfigError("Invalid length for escape character")
return esc_char
def start_ioucon(cmdline_args, stop_event):
global args
args = cmdline_args
if args.debug:
logging.basicConfig(level=logging.DEBUG)
else:
# default logging level
logging.basicConfig(level=logging.INFO)
# Create paths for the Unix domain sockets
netio = '/tmp/netio{}'.format(os.getuid())
ttyC = '{}/ttyC{}'.format(netio, args.appl_id)
ttyS = '{}/ttyS{}'.format(netio, args.appl_id)
try:
mkdir_netio(netio)
with FileLock(ttyC):
esc_char = get_escape_character(args.escape)
if args.telnet_server:
addr, _, port = args.telnet_server.partition(':')
nport = 0
try:
nport = int(port)
except ValueError:
pass
if (addr == '' or nport == 0):
raise ConfigError('format for --telnet-server must be '
'ADDR:PORT (like 127.0.0.1:20000)')
while not stop_event.is_set():
try:
if args.telnet_server:
with TelnetServer(addr, nport, stop_event) as console:
with IOU(ttyC, ttyS, stop_event) as router:
send_recv_loop(console, router, b'', stop_event)
else:
with IOU(ttyC, ttyS, stop_event) as router, TTY() as console:
send_recv_loop(console, router, esc_char, stop_event)
except ConnectionRefusedError:
pass
except KeyboardInterrupt:
sys.exit(EXIT_ABORT)
finally:
# Put us at the beginning of a line
if not args.telnet_server:
print()
except IOUConError as e:
if args.debug:
traceback.print_exc(file=sys.stderr)
else:
print(e, file=sys.stderr)
sys.exit(EXIT_FAILURE)
log.info("exiting...")
def main():
import threading
stop_event = threading.Event()
args = get_args()
start_ioucon(args, stop_event)
if __name__ == '__main__':
main()