/usr/lib/broctl/BroControl/config.py is in broctl 1.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import os
import socket
import re
import zlib
from BroControl import py3bro
from BroControl import node as node_mod
from BroControl import options
from .state import SqliteState
from .version import VERSION
# Class storing the broctl configuration.
#
# This class provides access to four types of configuration/state:
#
# - the global broctl configuration from broctl.cfg
# - the node configuration from node.cfg
# - dynamic state variables which are kept across restarts in spool/state.db
Config = None # Globally accessible instance of Configuration.
class ConfigurationError(Exception):
pass
class Configuration:
def __init__(self, basedir, cfgfile, broscriptdir, ui, localaddrs=[], state=None):
self.ui = ui
self.localaddrs = localaddrs
global Config
Config = self
self.config = {}
self.state = {}
self.nodestore = {}
# Read broctl.cfg.
self.config = self._read_config(cfgfile)
self._initialize_options(basedir, broscriptdir)
self._check_options()
if state:
self.state_store = state
else:
self.state_store = SqliteState(self.statefile)
def _initialize_options(self, basedir, broscriptdir):
from BroControl import execute
# Set defaults for options we get passed in.
self._set_option("brobase", basedir)
self._set_option("broscriptdir", broscriptdir)
self._set_option("version", VERSION)
# Initialize options that are not already set.
for opt in options.options:
if not opt.dontinit:
self._set_option(opt.name, opt.default)
# Set defaults for options we derive dynamically.
self._set_option("mailto", "%s" % os.getenv("USER"))
self._set_option("mailfrom", "Big Brother <bro@%s>" % socket.gethostname())
self._set_option("mailalarmsto", self.config["mailto"])
# Determine operating system.
(success, output) = execute.run_localcmd("uname")
if not success:
raise RuntimeError("cannot run uname")
self._set_option("os", output[0].lower().strip())
if self.config["os"] == "linux":
self._set_option("pin_command", "taskset -c")
elif self.config["os"] == "freebsd":
self._set_option("pin_command", "cpuset -l")
else:
self._set_option("pin_command", "")
# Find the time command (should be a GNU time for best results).
(success, output) = execute.run_localcmd("which time")
if success:
self._set_option("time", output[0].lower().strip())
else:
self._set_option("time", "")
# Do a basic sanity check on some critical options.
def _check_options(self):
dirs = ("brobase", "logdir", "spooldir", "cfgdir", "broscriptdir", "bindir", "libdirinternal", "plugindir", "scriptsdir")
files = ("makearchivename", )
for d in dirs:
v = self.config[d]
if not os.path.isdir(v):
raise ConfigurationError('broctl option "%s" directory not found: %s' % (d, v))
for f in files:
v = self.config[f]
if not os.path.isfile(v):
raise ConfigurationError('broctl option "%s" file not found: %s' % (f, v))
def initPostPlugins(self):
self.read_state()
# Read node.cfg
self.nodestore = self._read_nodes()
# If "env_vars" was specified in broctl.cfg, then apply to all nodes.
varlist = self.config.get("env_vars")
if varlist:
try:
global_env_vars = self._get_env_var_dict(varlist)
except ConfigurationError as err:
raise ConfigurationError("broctl config: %s" % err)
for node in self.nodes("all"):
for (key, val) in global_env_vars.items():
# Values from node.cfg take precedence over broctl.cfg
node.env_vars.setdefault(key, val)
# Set the standalone config option.
standalone = "0"
if len(self.nodestore) == 1:
standalone = "1"
self._set_option("standalone", standalone)
# Make sure cron flag is cleared.
self.config["cron"] = "0"
# Provides access to the configuration options via the dereference operator.
# Lookup the attribute in broctl options first, then in the dynamic state
# variables.
def __getattr__(self, attr):
if attr in self.config:
return self.config[attr]
if attr in self.state:
return self.state[attr]
raise AttributeError("unknown config attribute %s" % attr)
# Returns True if attribute is defined.
def has_attr(self, attr):
if attr in self.config:
return True
if attr in self.state:
return True
return False
# Returns a sorted list of all broctl.cfg entries.
# Includes dynamic variables if dynamic is true.
def options(self, dynamic=True):
optlist = list(self.config.items())
if dynamic:
optlist += list(self.state.items())
optlist.sort()
return optlist
# Returns a list of Nodes (the list will be empty if no matching nodes
# are found). The returned list is sorted by node type, and by node name
# for each type.
# - If tag is None, all Nodes are returned.
# - If tag is "all", all Nodes are returned if "expand_all" is true.
# If "expand_all" is false, returns an empty list in this case.
# - If tag is "proxies", all proxy Nodes are returned.
# - If tag is "workers", all worker Nodes are returned.
# - If tag is "manager", the manager Node is returned (cluster config) or
# the standalone Node is returned (standalone config).
# - If tag is "standalone", the standalone Node is returned.
# - If tag is the name of a node, then that node is returned.
def nodes(self, tag=None, expand_all=True):
nodes = []
nodetype = None
if tag == "all":
if not expand_all:
return []
tag = None
elif tag == "standalone":
nodetype = "standalone"
elif tag == "manager":
nodetype = "manager"
elif tag == "proxies":
nodetype = "proxy"
elif tag == "workers":
nodetype = "worker"
for n in self.nodestore.values():
if nodetype:
if nodetype == n.type:
nodes += [n]
elif tag == n.name or not tag:
nodes += [n]
nodes.sort(key=lambda n: (n.type, n.name))
if not nodes and tag == "manager":
nodes = self.nodes("standalone")
return nodes
# Returns the manager Node (cluster config) or standalone Node (standalone
# config).
def manager(self):
n = self.nodes("manager")
if n:
return n[0]
n = self.nodes("standalone")
if n:
return n[0]
return None
# Returns a list of nodes which is a subset of the result a similar call to
# nodes() would yield but within which each host appears only once.
# If "nolocal" parameter is True, then exclude the local host from results.
def hosts(self, tag=None, nolocal=False):
hosts = {}
nodelist = []
for node in self.nodes(tag):
if node.host in hosts:
continue
if (not nolocal) or (nolocal and node.addr not in self.localaddrs):
hosts[node.host] = 1
nodelist.append(node)
return nodelist
# Replace all occurences of "${option}", with option being either
# broctl.cfg option or a dynamic variable, with the corresponding value.
# Defaults to replacement with the empty string for unknown options.
def subst(self, text):
while True:
match = re.search(r"(\$\{([A-Za-z]+)(:([^}]+))?\})", text)
if not match:
return text
key = match.group(2).lower()
if self.has_attr(key):
value = self.__getattr__(key)
else:
value = match.group(4)
if not value:
value = ""
text = text[0:match.start(1)] + value + text[match.end(1):]
# Convert string into list of integers (ValueError is raised if any
# item in the list is not a non-negative integer).
def _get_pin_cpu_list(self, text, numprocs):
if not text:
return []
cpulist = [int(x) for x in text.split(",")]
# Minimum allowed CPU number is zero.
if min(cpulist) < 0:
raise ValueError
# Make sure list is at least as long as number of worker processes.
cpulen = len(cpulist)
if numprocs > cpulen:
cpulist = [ cpulist[i % cpulen] for i in range(numprocs) ]
return cpulist
# Convert a string consisting of a comma-separated list of environment
# variables (e.g. "VAR1=123, VAR2=456") to a dictionary.
# If the string is empty, then return an empty dictionary.
def _get_env_var_dict(self, text):
env_vars = {}
if text:
for keyval in text.split(","):
try:
(key, val) = keyval.split("=", 1)
except ValueError:
raise ConfigurationError("missing '=' in env_vars option: %s" % keyval)
key = key.strip()
if not key:
raise ConfigurationError("missing environment variable name in env_vars option: %s" % keyval)
env_vars[key] = val.strip()
return env_vars
# Parse node.cfg.
def _read_nodes(self):
config = py3bro.configparser.SafeConfigParser()
fname = self.nodecfg
try:
if not config.read(fname):
raise ConfigurationError("cannot read node config file: %s" % fname)
except py3bro.configparser.MissingSectionHeaderError as err:
raise ConfigurationError(err)
nodestore = {}
counts = {}
for sec in config.sections():
node = node_mod.Node(self, sec)
for (key, val) in config.items(sec):
key = key.replace(".", "_")
if key not in node_mod.Node._keys:
self.ui.warn("ignoring unrecognized node config option '%s' given for node '%s'" % (key, sec))
continue
node.__dict__[key] = val
self._check_node(node, nodestore, counts)
if node.name in nodestore:
raise ConfigurationError("duplicate node name '%s'" % node.name)
nodestore[node.name] = node
self._check_nodestore(nodestore)
return nodestore
def _check_node(self, node, nodestore, counts):
if not node.type:
raise ConfigurationError("no type given for node %s" % node.name)
if node.type not in ("manager", "proxy", "worker", "standalone"):
raise ConfigurationError("unknown node type '%s' given for node '%s'" % (node.type, node.name))
if not node.host:
raise ConfigurationError("no host given for node '%s'" % node.name)
try:
addrinfo = socket.getaddrinfo(node.host, None, 0, 0, socket.SOL_TCP)
except socket.gaierror as e:
raise ConfigurationError("unknown host '%s' given for node '%s' [%s]" % (node.host, node.name, e.args[1]))
addr_str = addrinfo[0][4][0]
# zone_id is handled manually, so strip it if it's there
node.addr = addr_str.split("%")[0]
# Convert env_vars from a string to a dictionary.
try:
node.env_vars = self._get_env_var_dict(node.env_vars)
except ConfigurationError as err:
raise ConfigurationError("node '%s' config: %s" % (node.name, err))
# Each node gets a number unique across its type.
try:
counts[node.type] += 1
except KeyError:
counts[node.type] = 1
node.count = counts[node.type]
numprocs = 0
if node.lb_procs:
if node.type != "worker":
raise ConfigurationError("load balancing node config options are only for worker nodes")
try:
numprocs = int(node.lb_procs)
except ValueError:
raise ConfigurationError("number of load-balanced processes must be an integer for node '%s'" % node.name)
if numprocs < 2:
raise ConfigurationError("number of load-balanced processes must be at least 2 for node '%s'" % node.name)
elif node.lb_method:
raise ConfigurationError("number of load-balanced processes not specified for node '%s'" % node.name)
try:
pin_cpus = self._get_pin_cpu_list(node.pin_cpus, numprocs)
except ValueError:
raise ConfigurationError("pin cpus list must contain only non-negative integers for node '%s'" % node.name)
if pin_cpus:
node.pin_cpus = pin_cpus[0]
if node.lb_procs:
if not node.lb_method:
raise ConfigurationError("no load balancing method given for node '%s'" % node.name)
if node.lb_method not in ("pf_ring", "myricom", "interfaces"):
raise ConfigurationError("unknown load balancing method '%s' given for node '%s'" % (node.lb_method, node.name))
if node.lb_method == "interfaces":
if not node.lb_interfaces:
raise ConfigurationError("list of load-balanced interfaces not specified for node '%s'" % node.name)
# get list of interfaces to use, and assign one to each node
netifs = node.lb_interfaces.split(",")
if len(netifs) != numprocs:
raise ConfigurationError("number of load-balanced interfaces is not same as number of load-balanced processes for node '%s'" % node.name)
node.interface = netifs.pop().strip()
origname = node.name
# node names will have a numerical suffix
node.name = "%s-1" % node.name
for num in range(2, numprocs + 1):
newnode = node.copy()
# only the node name, count, and pin_cpus need to be changed
newname = "%s-%d" % (origname, num)
newnode.name = newname
if newname in nodestore:
raise ConfigurationError("duplicate node name '%s'" % newname)
nodestore[newname] = newnode
counts[node.type] += 1
newnode.count = counts[node.type]
if pin_cpus:
newnode.pin_cpus = pin_cpus[num-1]
if newnode.lb_method == "interfaces":
newnode.interface = netifs.pop().strip()
def _check_nodestore(self, nodestore):
if not nodestore:
raise ConfigurationError("no nodes found in node config")
standalone = False
manager = False
proxy = False
manageronlocalhost = False
for n in nodestore.values():
if n.type == "manager":
if manager:
raise ConfigurationError("only one manager can be defined")
manager = True
if n.addr in ("127.0.0.1", "::1"):
manageronlocalhost = True
if n.addr not in self.localaddrs:
raise ConfigurationError("must run broctl only on manager node")
elif n.type == "proxy":
proxy = True
elif n.type == "standalone":
standalone = True
if standalone:
if len(nodestore) > 1:
raise ConfigurationError("more than one node defined in standalone node config")
else:
if not manager:
raise ConfigurationError("no manager defined in node config")
elif not proxy:
raise ConfigurationError("no proxy defined in node config")
# If manager is on localhost, then all other nodes must be on localhost
if manageronlocalhost:
for n in nodestore.values():
if n.type != "manager" and n.addr not in ("127.0.0.1", "::1"):
raise ConfigurationError("cannot use localhost/127.0.0.1/::1 for manager host in node config")
# Parses broctl.cfg and returns a dictionary of all entries.
def _read_config(self, fname):
config = {}
with open(fname, "r") as f:
for line in f:
line = line.strip()
if not line or line.startswith("#"):
continue
args = line.split("=", 1)
if len(args) != 2:
raise ConfigurationError("broctl config syntax error: %s" % line)
(key, val) = args
key = key.strip().lower()
# if the key already exists, just overwrite with new value
config[key] = val.strip()
return config
# Initialize a global option if not already set.
def _set_option(self, key, val):
key = key.lower()
if key not in self.config:
self.config[key] = self.subst(val)
# Set a dynamic state variable.
def set_state(self, key, val):
key = key.lower()
self.state[key] = val
self.state_store.set(key, val)
# Returns value of state variable, or None if it's not defined.
def get_state(self, key):
return self.state.get(key)
# Read dynamic state variables.
def read_state(self):
self.state = dict(self.state_store.items())
# Record the Bro version.
def record_bro_version(self):
version = self._get_bro_version()
self.set_state("broversion", version)
self.set_state("bro", self.subst("${bindir}/bro"))
# Warn user to run broctl install if any changes are detected to broctl
# config options, node config, Bro version, or if certain state variables
# are missing. If the "isinstall" parameter is True, then we're running
# the install or deploy command, so some of the warnings are skipped.
def warn_broctl_install(self, isinstall):
missingstate = False
# Check if node config has changed since last install.
if "hash-nodecfg" in self.state:
nodehash = self._get_nodecfg_hash()
if nodehash != self.state["hash-nodecfg"]:
# If running the install/deploy cmd, then skip this warning
if not isinstall:
self.ui.warn("broctl node config has changed (run the broctl \"deploy\" command)")
self._warn_dangling_bro()
return
else:
missingstate = True
# If we're running the install or deploy commands, then skip the
# rest of the checks.
if isinstall:
return
freshinstall = not os.path.exists(os.path.join(self.config["scriptsdir"], "broctl-config.sh"))
# If this is a fresh install (i.e., broctl install not yet run), then
# inform the user what to do.
if freshinstall:
self.ui.info("Hint: Run the broctl \"deploy\" command to get started.")
return
# Check if Bro version is different from the previously-installed
# version.
if "broversion" in self.state:
oldversion = self.state["broversion"]
version = self._get_bro_version()
if version != oldversion:
self.ui.warn("new bro version detected (run the broctl \"deploy\" command)")
return
else:
missingstate = True
# Check if any config values have changed since last install.
if "hash-broctlcfg" in self.state:
cfghash = self._get_broctlcfg_hash()
if cfghash != self.state["hash-broctlcfg"]:
self.ui.warn("broctl config has changed (run the broctl \"deploy\" command)")
return
else:
missingstate = True
# If any of the state variables don't exist, then we need to install
# (this would most likely indicate an upgrade install was performed
# over an old version that didn't have the state.db file).
if missingstate:
self.ui.warn("state database needs updating (run the broctl \"deploy\" command)")
return
# Warn if there might be any dangling Bro nodes (i.e., nodes that are
# no longer part of the current node configuration, but that are still
# running).
def _warn_dangling_bro(self):
nodes = [ n.name for n in self.nodes() ]
for key in self.state.keys():
# Check if a PID is defined for a Bro node
if key.endswith("-pid") and self.get_state(key):
nn = key[:-4]
# Check if node name is in list of all known nodes
if nn not in nodes:
hostkey = key.replace("-pid", "-host")
hname = self.get_state(hostkey)
if hname:
self.ui.warn("Bro node \"%s\" possibly still running on host \"%s\" (PID %s)" % (nn, hname, self.get_state(key)))
# Return a hash value (as a string) of the current broctl configuration.
def _get_broctlcfg_hash(self):
data = str(sorted(self.config.items()))
if py3bro.using_py3:
data = data.encode()
# The "bitwise AND" ensures the same result on any python version.
return str(zlib.crc32(data) & 0xffffffff)
# Update the stored hash value of the current broctl configuration.
def update_broctlcfg_hash(self):
cfghash = self._get_broctlcfg_hash()
self.set_state("hash-broctlcfg", cfghash)
# Return a hash value (as a string) of the current broctl node config.
def _get_nodecfg_hash(self):
nn = []
for n in self.nodes():
nn.append(tuple([(key, val) for key, val in n.items() if not key.startswith("_")]))
data = str(nn)
if py3bro.using_py3:
data = data.encode()
# The "bitwise AND" ensures the same result on any python version.
return str(zlib.crc32(data) & 0xffffffff)
# Update the stored hash value of the current broctl node config.
def update_nodecfg_hash(self):
nodehash = self._get_nodecfg_hash()
self.set_state("hash-nodecfg", nodehash)
# Runs Bro to get its version number.
def _get_bro_version(self):
from BroControl import execute
bro = self.subst("${bindir}/bro")
if not os.path.lexists(bro):
raise ConfigurationError("cannot find Bro binary: %s" % bro)
version = ""
(success, output) = execute.run_localcmd("%s -v" % bro)
if success and output:
version = output[-1]
else:
msg = ""
if output:
msg = " with output:\n%s" % "\n".join(output)
raise ConfigurationError("running \"bro -v\" failed%s" % msg)
match = re.search(".* version ([^ ]*).*$", version)
if not match:
raise ConfigurationError("cannot determine Bro version [%s]" % version.strip())
version = match.group(1)
# If bro is built with the "--enable-debug" configure option, then it
# appends "-debug" to the version string.
if version.endswith("-debug"):
version = version[:-6]
return version
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