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# vi: ts=4 expandtab
#
# Copyright (C) 2015 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, 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/>.
from cloudinit import log as logging
from cloudinit import util
from cloudinit.settings import PER_INSTANCE
import re
LOG = logging.getLogger(__name__)
frequency = PER_INSTANCE
BUILTIN_CFG = {
'remotes_file': '/etc/rsyslog.d/20-cloudinit-remotes.conf',
'remotes': {},
'service_name': 'rsyslog',
}
COMMENT_RE = re.compile(r'[ ]*[#]+[ ]*')
HOST_PORT_RE = re.compile(
r'^(?P<proto>[@]{0,2})'
'(([[](?P<bracket_addr>[^\]]*)[\]])|(?P<addr>[^:]*))'
'([:](?P<port>[0-9]+))?$')
def parse_remotes_line(line, name=None):
try:
data, comment = COMMENT_RE.split(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 = HOST_PORT_RE.match(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')
print("host_port: %s" % addr)
print("port: %s" % 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(object):
def __init__(self, name=None, match=None, proto=None, addr=None,
port=None):
if not match:
match = "*.*"
self.name = name
self.match = match
if proto == "@":
proto = "udp"
elif proto == "@@":
proto = "tcp"
self.proto = proto
self.addr = addr
if port:
self.port = int(port)
else:
self.port = None
def validate(self):
if self.port:
try:
int(self.port)
except ValueError:
raise ValueError("port '%s' is not an integer" % self.port)
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):
if not remotes:
return None
lines = []
if header is not None:
lines.append(header)
for name, line in remotes.items():
try:
lines.append(parse_remotes_line(line, name=name))
except ValueError as e:
LOG.warn("failed loading remote %s: %s [%s]", name, line, e)
return '\n'.join(str(lines)) + '\n'
def reload_syslog(systemd, service='rsyslog'):
if systemd:
cmd = ['systemctl', 'reload-or-try-restart', service]
else:
cmd = ['service', service, 'reload']
try:
util.subp(cmd, capture=True)
except util.ProcessExecutionError as e:
LOG.warn("Failed to reload syslog using '%s': %s", ' '.join(cmd), e)
def handle(name, cfg, cloud, log, args):
cfgin = cfg.get('syslog')
if not cfgin:
cfgin = {}
mycfg = util.mergemanydict([cfgin, BUILTIN_CFG])
remotes_file = mycfg.get('remotes_file')
if util.is_false(remotes_file):
LOG.debug("syslog/remotes_file empty, doing nothing")
return
remotes = mycfg.get('remotes_dict', {})
if remotes and not isinstance(remotes, dict):
LOG.warn("syslog/remotes: content is not a dictionary")
return
config_data = remotes_to_rsyslog_cfg(
remotes, header="#cloud-init syslog module")
util.write_file(remotes_file, config_data)
reload_syslog(
systemd=cloud.distro.uses_systemd(),
service=mycfg.get('service_name'))
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