From 3e713e5c96081206c47a44cf044428bcfa27cd02 Mon Sep 17 00:00:00 2001 From: Indrajit Raychaudhuri Date: Fri, 29 Dec 2023 18:21:33 -0600 Subject: dns: T5959: Streamline dns forwarding service Streamline configuration and operation of dns forwarding service in following ways: - Remove `dns_forwarding_reset.py` as its functionality is now covered by `dns.py` - Adjust function names in `dns.py` to disambiguate between DNS forwarding and dynamic DNS - Remove `dns_forwarding_restart.sh` as its functionality is inlined in `dns-forwarding.xml` - Templatize systemd override for `pdns-recursor.service` and move the generated override files in /run. This ensures that the override files are always generated afresh after boot - Simplify the systemd override file by removing the redundant overrides - Relocate configuration path for pdns-recursor to `/run/pdns-recursor` and utilize the `RuntimeDirectory` default that pdns-recursor expects - We do not need to use custom `--socket-dir` path anymore, the default path (viz., `/run/pdns-recursor` is fine) (cherry picked from commit 1c1fb5fb4bd7c0d205b28caf90357ad56423464f) --- src/conf_mode/service_dns_forwarding.py | 36 ++++++++---- .../system/pdns-recursor.service.d/override.conf | 8 --- src/op_mode/dns.py | 64 ++++++++++++++++------ src/op_mode/dns_forwarding_reset.py | 54 ------------------ src/op_mode/dns_forwarding_restart.sh | 8 --- src/services/vyos-hostsd | 12 ++-- 6 files changed, 76 insertions(+), 106 deletions(-) delete mode 100644 src/etc/systemd/system/pdns-recursor.service.d/override.conf delete mode 100755 src/op_mode/dns_forwarding_reset.py delete mode 100755 src/op_mode/dns_forwarding_restart.sh (limited to 'src') diff --git a/src/conf_mode/service_dns_forwarding.py b/src/conf_mode/service_dns_forwarding.py index c186f47af..ecad765f4 100755 --- a/src/conf_mode/service_dns_forwarding.py +++ b/src/conf_mode/service_dns_forwarding.py @@ -1,6 +1,6 @@ #!/usr/bin/env python3 # -# Copyright (C) 2018-2022 VyOS maintainers and contributors +# Copyright (C) 2018-2024 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 @@ -26,18 +26,18 @@ from vyos.template import render from vyos.template import bracketize_ipv6 from vyos.utils.process import call from vyos.utils.permission import chown -from vyos.utils.dict import dict_search from vyos import ConfigError from vyos import airbag airbag.enable() -pdns_rec_user = pdns_rec_group = 'pdns' -pdns_rec_run_dir = '/run/powerdns' +pdns_rec_user_group = 'pdns' +pdns_rec_run_dir = '/run/pdns-recursor' pdns_rec_lua_conf_file = f'{pdns_rec_run_dir}/recursor.conf.lua' pdns_rec_hostsd_lua_conf_file = f'{pdns_rec_run_dir}/recursor.vyos-hostsd.conf.lua' pdns_rec_hostsd_zones_file = f'{pdns_rec_run_dir}/recursor.forward-zones.conf' pdns_rec_config_file = f'{pdns_rec_run_dir}/recursor.conf' +pdns_rec_systemd_override = '/run/systemd/system/pdns-recursor.service.d/override.conf' hostsd_tag = 'static' @@ -55,6 +55,9 @@ def get_config(config=None): get_first_key=True, with_recursive_defaults=True) + dns['config_file'] = pdns_rec_config_file + dns['config_dir'] = os.path.dirname(pdns_rec_config_file) + # some additions to the default dictionary if 'system' in dns: base_nameservers = ['system', 'name-server'] @@ -251,11 +254,16 @@ def generate(dns): if not dns: return None - render(pdns_rec_config_file, 'dns-forwarding/recursor.conf.j2', - dns, user=pdns_rec_user, group=pdns_rec_group) + render(pdns_rec_systemd_override, 'dns-forwarding/override.conf.j2', dns) + + render(pdns_rec_config_file, 'dns-forwarding/recursor.conf.j2', dns, + user=pdns_rec_user_group, group=pdns_rec_user_group) - render(pdns_rec_lua_conf_file, 'dns-forwarding/recursor.conf.lua.j2', - dns, user=pdns_rec_user, group=pdns_rec_group) + render(pdns_rec_config_file, 'dns-forwarding/recursor.conf.j2', dns, + user=pdns_rec_user_group, group=pdns_rec_user_group) + + render(pdns_rec_lua_conf_file, 'dns-forwarding/recursor.conf.lua.j2', dns, + user=pdns_rec_user_group, group=pdns_rec_user_group) for zone_filename in glob(f'{pdns_rec_run_dir}/zone.*.conf'): os.unlink(zone_filename) @@ -263,21 +271,25 @@ def generate(dns): if 'authoritative_zones' in dns: for zone in dns['authoritative_zones']: render(zone['file'], 'dns-forwarding/recursor.zone.conf.j2', - zone, user=pdns_rec_user, group=pdns_rec_group) + zone, user=pdns_rec_user_group, group=pdns_rec_user_group) # if vyos-hostsd didn't create its files yet, create them (empty) for file in [pdns_rec_hostsd_lua_conf_file, pdns_rec_hostsd_zones_file]: with open(file, 'a'): pass - chown(file, user=pdns_rec_user, group=pdns_rec_group) + chown(file, user=pdns_rec_user_group, group=pdns_rec_user_group) return None def apply(dns): + systemd_service = 'pdns-recursor.service' + # Reload systemd manager configuration + call('systemctl daemon-reload') + if not dns: # DNS forwarding is removed in the commit - call('systemctl stop pdns-recursor.service') + call(f'systemctl stop {systemd_service}') if os.path.isfile(pdns_rec_config_file): os.unlink(pdns_rec_config_file) @@ -345,7 +357,7 @@ def apply(dns): hc.apply() ### finally (re)start pdns-recursor - call('systemctl restart pdns-recursor.service') + call(f'systemctl reload-or-restart {systemd_service}') if __name__ == '__main__': try: diff --git a/src/etc/systemd/system/pdns-recursor.service.d/override.conf b/src/etc/systemd/system/pdns-recursor.service.d/override.conf deleted file mode 100644 index 158bac02b..000000000 --- a/src/etc/systemd/system/pdns-recursor.service.d/override.conf +++ /dev/null @@ -1,8 +0,0 @@ -[Service] -WorkingDirectory= -WorkingDirectory=/run/powerdns -RuntimeDirectory= -RuntimeDirectory=powerdns -RuntimeDirectoryPreserve=yes -ExecStart= -ExecStart=/usr/sbin/pdns_recursor --daemon=no --write-pid=no --disable-syslog --log-timestamp=no --config-dir=/run/powerdns --socket-dir=/run/powerdns diff --git a/src/op_mode/dns.py b/src/op_mode/dns.py index 2168aef89..309bef3b9 100755 --- a/src/op_mode/dns.py +++ b/src/op_mode/dns.py @@ -1,6 +1,6 @@ #!/usr/bin/env python3 # -# Copyright (C) 2022 VyOS maintainers and contributors +# Copyright (C) 2022-2024 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 @@ -15,17 +15,16 @@ # along with this program. If not, see . +import typing import sys +import vyos.opmode from tabulate import tabulate - from vyos.configquery import ConfigTreeQuery -from vyos.utils.process import cmd +from vyos.utils.process import cmd, rc_cmd -import vyos.opmode - -def _data_to_dict(data, sep="\t") -> dict: +def _forwarding_data_to_dict(data, sep="\t") -> dict: """ Return dictionary from plain text separated by tab @@ -52,15 +51,15 @@ def _data_to_dict(data, sep="\t") -> dict: return dictionary -def _get_raw_forwarding_statistics() -> dict: - command = cmd('rec_control --socket-dir=/run/powerdns get-all') - data = _data_to_dict(command) +def _get_forwarding_statistics_raw() -> dict: + command = cmd('rec_control get-all') + data = _forwarding_data_to_dict(command) data['cache-size'] = "{0:.2f}".format( int( - cmd('rec_control --socket-dir=/run/powerdns get cache-bytes')) / 1024 ) + cmd('rec_control get cache-bytes')) / 1024 ) return data -def _get_formatted_forwarding_statistics(data): +def _get_forwarding_statistics_formatted(data): cache_entries = data.get('cache-entries') max_cache_entries = data.get('max-cache-entries') cache_size = data.get('cache-size') @@ -69,19 +68,48 @@ def _get_formatted_forwarding_statistics(data): output = tabulate(data_entries, headers, numalign="left") return output +def _verify_forwarding(func): + """Decorator checks if DNS Forwarding config exists""" + from functools import wraps -def show_forwarding_statistics(raw: bool): - - config = ConfigTreeQuery() - if not config.exists('service dns forwarding'): - raise vyos.opmode.UnconfiguredSubsystem('DNS forwarding is not configured') + @wraps(func) + def _wrapper(*args, **kwargs): + config = ConfigTreeQuery() + if not config.exists('service dns forwarding'): + raise vyos.opmode.UnconfiguredSubsystem('DNS Forwarding is not configured') + return func(*args, **kwargs) + return _wrapper - dns_data = _get_raw_forwarding_statistics() +@_verify_forwarding +def show_forwarding_statistics(raw: bool): + dns_data = _get_forwarding_statistics_raw() if raw: return dns_data else: - return _get_formatted_forwarding_statistics(dns_data) + return _get_forwarding_statistics_formatted(dns_data) +@_verify_forwarding +def reset_forwarding(all: bool, domain: typing.Optional[str]): + """ + Reset DNS Forwarding cache + + :param all (bool): reset cache all domains + :param domain (str): reset cache for specified domain + """ + if all: + rc, output = rc_cmd('rec_control wipe-cache ".$"') + if rc != 0: + print(output) + return None + print('DNS Forwarding cache reset for all domains!') + return output + elif domain: + rc, output = rc_cmd(f'rec_control wipe-cache "{domain}$"') + if rc != 0: + print(output) + return None + print(f'DNS Forwarding cache reset for domain "{domain}"!') + return output if __name__ == '__main__': try: diff --git a/src/op_mode/dns_forwarding_reset.py b/src/op_mode/dns_forwarding_reset.py deleted file mode 100755 index 55e20918f..000000000 --- a/src/op_mode/dns_forwarding_reset.py +++ /dev/null @@ -1,54 +0,0 @@ -#!/usr/bin/env python3 -# -# Copyright (C) 2018 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 . -# -# File: vyos-show-version -# Purpose: -# Displays image version and system information. -# Used by the "run show version" command. - - -import os -import argparse - -from sys import exit -from vyos.config import Config -from vyos.utils.process import call - -PDNS_CMD='/usr/bin/rec_control --socket-dir=/run/powerdns' - -parser = argparse.ArgumentParser() -parser.add_argument("-a", "--all", action="store_true", help="Reset all cache") -parser.add_argument("domain", type=str, nargs="?", help="Domain to reset cache entries for") - -if __name__ == '__main__': - args = parser.parse_args() - - # Do nothing if service is not configured - c = Config() - if not c.exists_effective(['service', 'dns', 'forwarding']): - print("DNS forwarding is not configured") - exit(0) - - if args.all: - call(f"{PDNS_CMD} wipe-cache \'.$\'") - exit(0) - - elif args.domain: - call(f"{PDNS_CMD} wipe-cache \'{0}$\'".format(args.domain)) - - else: - parser.print_help() - exit(1) diff --git a/src/op_mode/dns_forwarding_restart.sh b/src/op_mode/dns_forwarding_restart.sh deleted file mode 100755 index 64cc92115..000000000 --- a/src/op_mode/dns_forwarding_restart.sh +++ /dev/null @@ -1,8 +0,0 @@ -#!/bin/sh - -if cli-shell-api existsEffective service dns forwarding; then - echo "Restarting the DNS forwarding service" - systemctl restart pdns-recursor.service -else - echo "DNS forwarding is not configured" -fi diff --git a/src/services/vyos-hostsd b/src/services/vyos-hostsd index e34a4b740..1ba90471e 100755 --- a/src/services/vyos-hostsd +++ b/src/services/vyos-hostsd @@ -271,8 +271,8 @@ SOCKET_PATH = "ipc://" + os.path.join(RUN_DIR, 'vyos-hostsd.sock') RESOLV_CONF_FILE = '/etc/resolv.conf' HOSTS_FILE = '/etc/hosts' -PDNS_REC_USER = PDNS_REC_GROUP = 'pdns' -PDNS_REC_RUN_DIR = '/run/powerdns' +PDNS_REC_USER_GROUP = 'pdns' +PDNS_REC_RUN_DIR = '/run/pdns-recursor' PDNS_REC_LUA_CONF_FILE = f'{PDNS_REC_RUN_DIR}/recursor.vyos-hostsd.conf.lua' PDNS_REC_ZONES_FILE = f'{PDNS_REC_RUN_DIR}/recursor.forward-zones.conf' @@ -436,18 +436,18 @@ def make_hosts(state): def make_pdns_rec_conf(state): logger.info(f"Writing {PDNS_REC_LUA_CONF_FILE}") - # on boot, /run/powerdns does not exist, so create it - makedir(PDNS_REC_RUN_DIR, user=PDNS_REC_USER, group=PDNS_REC_GROUP) + # on boot, /run/pdns-recursor does not exist, so create it + makedir(PDNS_REC_RUN_DIR, user=PDNS_REC_USER_GROUP, group=PDNS_REC_USER_GROUP) chmod_755(PDNS_REC_RUN_DIR) render(PDNS_REC_LUA_CONF_FILE, 'dns-forwarding/recursor.vyos-hostsd.conf.lua.j2', - state, user=PDNS_REC_USER, group=PDNS_REC_GROUP) + state, user=PDNS_REC_USER_GROUP, group=PDNS_REC_USER_GROUP) logger.info(f"Writing {PDNS_REC_ZONES_FILE}") render(PDNS_REC_ZONES_FILE, 'dns-forwarding/recursor.forward-zones.conf.j2', - state, user=PDNS_REC_USER, group=PDNS_REC_GROUP) + state, user=PDNS_REC_USER_GROUP, group=PDNS_REC_USER_GROUP) def set_host_name(state, data): if data['host_name']: -- cgit v1.2.3