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cc_rsyslog.py
# Copyright (C) 2009-2010 Canonical Ltd. # Copyright (C) 2012 Hewlett-Packard Development Company, L.P. # Copyright (C) 2023 FreeBSD Foundation # # Author: Scott Moser <scott.moser@canonical.com> # Author: Juerg Haefliger <juerg.haefliger@hp.com> # Author: Mina Galić <FreeBSD@igalic.co> # # This file is part of cloud-init. See LICENSE file for license information. """Rsyslog: Configure system logging via rsyslog""" import contextlib import copy import logging import os import re from cloudinit import lifecycle, subp, util from cloudinit.cloud import Cloud from cloudinit.config import Config from cloudinit.config.schema import MetaSchema from cloudinit.distros import ALL_DISTROS, Distro from cloudinit.log import loggers from cloudinit.settings import PER_INSTANCE meta: MetaSchema = { "id": "cc_rsyslog", "distros": [ALL_DISTROS], "frequency": PER_INSTANCE, "activate_by_schema_keys": ["rsyslog"], } RSYSLOG_CONFIG = { "config_dir": "/etc/rsyslog.d", "config_filename": "20-cloud-config.conf", "service_reload_command": "auto", "remotes": {}, "configs": {}, "check_exe": "rsyslogd", "packages": ["rsyslog"], "install_rsyslog": False, } DISTRO_OVERRIDES = { "freebsd": { "config_dir": "/usr/local/etc/rsyslog.d", "packages": ["rsyslog"], }, "openbsd": { "config_dir": "/usr/local/etc/rsyslog.d", "packages": ["sysutils/rsyslog"], }, "netbsd": { "config_dir": "/usr/pkg/etc/rsyslog.d", "packages": ["sysutils/rsyslog"], }, } LOG = logging.getLogger(__name__) def distro_default_rsyslog_config(distro: Distro): """Construct a distro-specific rsyslog config dictionary by merging distro specific changes into base config. @param distro: String providing the distro class name. @returns: Dict of distro configurations for ntp clients. """ dcfg = DISTRO_OVERRIDES cfg = copy.copy(RSYSLOG_CONFIG) if distro.osfamily in dcfg: cfg = util.mergemanydict([cfg, dcfg[distro.name]], reverse=True) return cfg def install_rsyslog(install_func, packages=None, check_exe="rsyslog"): """Install rsyslog package if not already installed. @param install_func: function. This parameter is invoked with the contents of the packages parameter. @param packages: list. This parameter defaults to ['rsyslog']. @param check_exe: string. The name of a binary that indicates the package the specified package is already installed. """ if subp.which(check_exe): return if packages is None: packages = ["rsyslog"] install_func(packages) def reload_syslog(distro, command="auto"): if command == "auto": service = distro.get_option("rsyslog_svcname", "rsyslog") return distro.manage_service("try-reload", service) return subp.subp(command, capture=True) def load_config(cfg: dict, distro: Distro) -> dict: """Return an updated config. Support converting the old top level format into new format. Raise a `ValueError` if some top level entry has an incorrect type. """ mycfg = cfg.get("rsyslog", {}) distro_config = distro_default_rsyslog_config(distro) if isinstance(cfg.get("rsyslog"), list): lifecycle.deprecate( deprecated="The rsyslog key with value of type 'list'", deprecated_version="22.2", ) mycfg = {"configs": cfg.get("rsyslog")} if "rsyslog_filename" in cfg: mycfg["config_filename"] = cfg["rsyslog_filename"] if "rsyslog_dir" in cfg: mycfg["config_dir"] = cfg["rsyslog_dir"] fillup: tuple = ( ("configs", [], list), ("config_dir", distro_config["config_dir"], str), ("config_filename", distro_config["config_filename"], str), ("remotes", distro_config["remotes"], dict), ( "service_reload_command", distro_config["service_reload_command"], (str, list), ), ("check_exe", distro_config["check_exe"], str), ("packages", distro_config["packages"], list), ("install_rsyslog", distro_config["install_rsyslog"], bool), ) for key, default, vtypes in fillup: if key not in mycfg: mycfg[key] = default elif not isinstance(mycfg[key], vtypes): raise ValueError( f"Invalid type for key `{key}`. Expected type(s): {vtypes}. " f"Current type: {type(mycfg[key])}" ) return mycfg def apply_rsyslog_changes(configs, def_fname, cfg_dir): # apply the changes in 'configs' to the paths in def_fname and cfg_dir # return a list of the files changed files = [] for cur_pos, ent in enumerate(configs): if isinstance(ent, dict): if "content" not in ent: LOG.warning( "No 'content' entry in config entry %s", cur_pos + 1 ) continue content = ent["content"] filename = ent.get("filename", def_fname) else: content = ent filename = def_fname filename = filename.strip() if not filename: LOG.warning("Entry %s has an empty filename", cur_pos + 1) continue filename = os.path.join(cfg_dir, filename) # Truncate filename first time you see it omode = "ab" if filename not in files: omode = "wb" files.append(filename) try: endl = "" if not content.endswith("\n"): endl = "\n" util.write_file(filename, content + endl, omode=omode) except Exception: util.logexc(LOG, "Failed to write to %s", filename) return files def parse_remotes_line(line, name=None): try: data, comment = re.split(r"[ ]*[#]+[ ]*", line) comment = comment.strip() except ValueError: data, comment = (line, None) toks = data.strip().split() match = None if len(toks) == 1: host_port = data elif len(toks) == 2: match, host_port = toks else: raise ValueError("line had multiple spaces: %s" % data) toks = re.match( r"^(?P<proto>[@]{0,2})" r"(([\[](?P<bracket_addr>[^\]]*)[\]])|(?P<addr>[^:]*))" r"([:](?P<port>[0-9]+))?$", host_port, ) if not toks: raise ValueError("Invalid host specification '%s'" % host_port) proto = toks.group("proto") addr = toks.group("addr") or toks.group("bracket_addr") port = toks.group("port") if addr.startswith("[") and not addr.endswith("]"): raise ValueError("host spec had invalid brackets: %s" % addr) if comment and not name: name = comment t = SyslogRemotesLine( name=name, match=match, proto=proto, addr=addr, port=port ) t.validate() return t class SyslogRemotesLine: def __init__( self, name=None, match=None, proto=None, addr=None, port=None ): if not match: match = "*.*" self.name = name self.match = match if not proto: proto = "udp" if proto == "@": proto = "udp" elif proto == "@@": proto = "tcp" self.proto = proto self.addr = addr self.port = int(port) if port is not None else None def validate(self): if self.port: try: int(self.port) except ValueError as e: raise ValueError( "port '%s' is not an integer" % self.port ) from e if not self.addr: raise ValueError("address is required") def __repr__(self): return "[name=%s match=%s proto=%s address=%s port=%s]" % ( self.name, self.match, self.proto, self.addr, self.port, ) def __str__(self): buf = self.match + " " if self.proto == "udp": buf += "@" elif self.proto == "tcp": buf += "@@" if ":" in self.addr: buf += "[" + self.addr + "]" else: buf += self.addr if self.port: buf += ":%s" % self.port if self.name: buf += " # %s" % self.name return buf def remotes_to_rsyslog_cfg(remotes, header=None, footer=None): if not remotes: return None lines = [] if header is not None: lines.append(header) for name, line in remotes.items(): if not line: continue try: lines.append(str(parse_remotes_line(line, name=name))) except ValueError as e: LOG.warning("failed loading remote %s: %s [%s]", name, line, e) if footer is not None: lines.append(footer) return "\n".join(lines) + "\n" def disable_and_stop_bsd_base_syslog(cloud: Cloud) -> None: """ This helper function bundles the necessary steps to disable BSD base syslog ``rc(8)`` reads its configuration on start, so after disabling syslogd, we need to tell rc to reload its config """ try: cloud.distro.manage_service("enabled", "syslogd") except subp.ProcessExecutionError: return cloud.distro.manage_service("disable", "syslogd") cloud.distro.reload_init() with contextlib.suppress(subp.ProcessExecutionError): # for some inexplicable reason we're running after syslogd, # try to stop it, ignoring failures, only log the fact that # syslog is running, which it shouldn't be. cloud.distro.manage_service("onestop", "syslogd") LOG.error( "syslogd is running before cloud-init! " "Please report this as bug to the porters!" ) def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None: if "rsyslog" not in cfg: LOG.debug( "Skipping module named %s, no 'rsyslog' key in configuration", name ) return mycfg = load_config(cfg, cloud.distro) configs = mycfg["configs"] if mycfg["remotes"]: configs.append( remotes_to_rsyslog_cfg( mycfg["remotes"], header="# begin remotes", footer="# end remotes", ) ) service = cloud.distro.get_option("rsyslog_svcname", "rsyslog") if mycfg["install_rsyslog"] is True: install_rsyslog( cloud.distro.install_packages, packages=mycfg["packages"], check_exe=mycfg["check_exe"], ) if util.is_BSD(): cloud.distro.manage_service("enable", service) disable_and_stop_bsd_base_syslog(cloud) if not mycfg["configs"]: LOG.debug("Empty config rsyslog['configs'], nothing to do") return changes = apply_rsyslog_changes( configs=mycfg["configs"], def_fname=mycfg["config_filename"], cfg_dir=mycfg["config_dir"], ) if not changes: LOG.debug("restart of syslog not necessary, no changes made") return try: restarted = reload_syslog( cloud.distro, command=mycfg["service_reload_command"] ) except subp.ProcessExecutionError as e: restarted = False LOG.warning("Failed to reload syslog %s", str(e)) if restarted: # This only needs to run if we *actually* restarted # syslog above. loggers.reset_logging() loggers.setup_logging(cloud.cfg) # This should now use rsyslog if # the logging was setup to use it... LOG.debug("%s configured %s files", name, changes)
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