Page MenuHomeVyOS Platform
Files F118309674

vyos-configd
No OneTemporary
Actions

Size
6 KB
Referenced Files
None
Subscribers
None

vyos-configd
View Options

#!/usr/bin/env python3
#
# Copyright (C) 2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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 os
import sys
import grp
import re
import json
import logging
import signal
import importlib.util
import zmq
from vyos.defaults import directories
from vyos.configsource import ConfigSourceString, ConfigSourceError
from vyos.config import Config
from vyos import ConfigError
CFG_GROUP = 'vyattacfg'
debug = True
logger = logging.getLogger(__name__)
logs_handler = logging.StreamHandler()
logger.addHandler(logs_handler)
if debug:
logger.setLevel(logging.DEBUG)
else:
logger.setLevel(logging.INFO)
SOCKET_PATH = "ipc:///run/vyos-configd.sock"
# Response error codes
R_SUCCESS = 1
R_ERROR_COMMIT = 2
R_ERROR_DAEMON = 4
R_PASS = 8
vyos_conf_scripts_dir = directories['conf_mode']
configd_include_file = os.path.join(directories['data'], 'configd-include.json')
configd_env_set_file = os.path.join(directories['data'], 'vyos-configd-env-set')
configd_env_unset_file = os.path.join(directories['data'], 'vyos-configd-env-unset')
# sourced on entering config session
configd_env_file = '/etc/default/vyos-configd-env'
session_tty = None
def key_name_from_file_name(f):
return os.path.splitext(f)[0]
def module_name_from_key(k):
return k.replace('-', '_')
def path_from_file_name(f):
return os.path.join(vyos_conf_scripts_dir, f)
# opt-in to be run by daemon
with open(configd_include_file) as f:
try:
include = json.load(f)
except OSError as e:
logger.critical(f"configd include file error: {e}")
sys.exit(1)
except json.JSONDecodeError as e:
logger.critical(f"JSON load error: {e}")
sys.exit(1)
# import conf_mode scripts
(_, _, filenames) = next(iter(os.walk(vyos_conf_scripts_dir)))
filenames.sort()
load_filenames = [f for f in filenames if f in include]
imports = [key_name_from_file_name(f) for f in load_filenames]
module_names = [module_name_from_key(k) for k in imports]
paths = [path_from_file_name(f) for f in load_filenames]
to_load = list(zip(module_names, paths))
modules = []
for x in to_load:
spec = importlib.util.spec_from_file_location(x[0], x[1])
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
modules.append(module)
conf_mode_scripts = dict(zip(imports, modules))
exclude_set = {key_name_from_file_name(f) for f in filenames if f not in include}
include_set = {key_name_from_file_name(f) for f in filenames if f in include}
def explicit_print(t, m):
try:
with open(t, 'w') as f:
f.write(m)
f.write("\n")
f.flush()
except Exception:
pass
def run_script(script, config) -> int:
config.set_level([])
try:
c = script.get_config(config)
script.verify(c)
script.generate(c)
script.apply(c)
except ConfigError as e:
logger.critical(e)
explicit_print(session_tty, str(e))
return R_ERROR_COMMIT
except Exception:
return R_ERROR_DAEMON
return R_SUCCESS
def initialization(socket):
global session_tty
# Reset config strings:
active_string = ''
session_string = ''
# check first for resent init msg, in case of client timeout
while True:
msg = socket.recv().decode()
try:
message = json.loads(msg)
if message["type"] == "init":
resp = "init"
socket.send(resp.encode())
except:
break
# zmq synchronous for ipc from single client:
active_string = msg
resp = "active"
socket.send(resp.encode())
session_string = socket.recv().decode()
resp = "session"
socket.send(resp.encode())
pid_string = socket.recv().decode()
resp = "pid"
socket.send(resp.encode())
logger.debug(f"config session pid is {pid_string}")
try:
session_tty = os.readlink(f"/proc/{pid_string}/fd/1")
except FileNotFoundError:
session_tty = None
try:
configsource = ConfigSourceString(running_config_text=active_string,
session_config_text=session_string)
except ConfigSourceError as e:
logger.debug(e)
return None
config = Config(config_source=configsource)
return config
def process_node_data(config, data) -> int:
if not config:
logger.critical(f"Empty config")
return R_ERROR_DAEMON
script_name = None
res = re.match(r'^.+\/([^/].+).py(VYOS_TAGNODE_VALUE=.+)?', data)
if res.group(1):
script_name = res.group(1)
if res.group(2):
env = res.group(2).split('=')
os.environ[env[0]] = env[1]
if not script_name:
logger.critical(f"Missing script_name")
return R_ERROR_DAEMON
if script_name in exclude_set:
return R_PASS
result = run_script(conf_mode_scripts[script_name], config)
return result
def remove_if_file(f: str):
try:
os.remove(f)
except FileNotFoundError:
pass
except OSError:
raise
def shutdown():
remove_if_file(configd_env_file)
os.symlink(configd_env_unset_file, configd_env_file)
sys.exit(0)
if __name__ == '__main__':
context = zmq.Context()
socket = context.socket(zmq.REP)
# Set the right permissions on the socket, then change it back
o_mask = os.umask(0)
socket.bind(SOCKET_PATH)
os.umask(o_mask)
cfg_group = grp.getgrnam(CFG_GROUP)
os.setgid(cfg_group.gr_gid)
os.environ['SUDO_USER'] = 'vyos'
os.environ['SUDO_GID'] = str(cfg_group.gr_gid)
def sig_handler(signum, frame):
shutdown()
signal.signal(signal.SIGTERM, sig_handler)
signal.signal(signal.SIGINT, sig_handler)
# Define the vyshim environment variable
remove_if_file(configd_env_file)
os.symlink(configd_env_set_file, configd_env_file)
config = None
while True:
# Wait for next request from client
msg = socket.recv().decode()
logger.debug(f"Received message: {msg}")
message = json.loads(msg)
if message["type"] == "init":
resp = "init"
socket.send(resp.encode())
config = initialization(socket)
elif message["type"] == "node":
res = process_node_data(config, message["data"])
response = res.to_bytes(1, byteorder=sys.byteorder)
logger.debug(f"Sending response {res}")
socket.send(response)
else:
logger.critical(f"Unexpected message: {message}")

File Metadata

Mime Type
text/x-script.python
Expires
Sat, Oct 17, 12:50 AM (1 d, 16 h)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
4377330
Default Alt Text
vyos-configd (6 KB)

Event Timeline