cdist configuration management Latest manual: https://www.cdi.st/manual/latest/ Home page: https://www.cdi.st
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# -*- coding: utf-8 -*-
#
# 2020 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
#
# Interface to be implemented:
# - cdist scan --mode {scan, trigger, install, config}, --mode can be repeated
# scan: scan / listen for icmp6 replies
# trigger: send trigger to multicast
# config: configure newly detected hosts
# install: install newly detected hosts
#
# Scanner logic
# - save results to configdir:
# basedir = ~/.cdist/scan/<ipv6-address>
# last_seen = ~/.cdist/scan/<ipv6-address>/last_seen -- record unix time or similar
# last_configured = ~/.cdist/scan/<ipv6-address>/last_configured -- record unix time or similar
# last_installed = ~/.cdist/scan/<ipv6-address>/last_configured -- record unix time or similar
#
#
#
#
# cdist scan --list
# Show all known hosts including last seen flag
#
# Logic for reconfiguration:
#
# - record when configured last time
# - introduce a parameter --reconfigure-after that takes time argument
# - reconfigure if a) host alive and b) reconfigure-after time passed
#
from multiprocessing import Process
import os
import logging
from scapy.all import *
# Datetime overwrites scapy.all.datetime - needs to be imported AFTER
import datetime
log = logging.getLogger("scan")
class Trigger(object):
"""
Trigger an ICMPv6EchoReply from all hosts that are alive
"""
def __init__(self, interfaces=None, verbose=False):
self.interfaces = interfaces
self.verbose = verbose
# Wait 5 seconds before triggering again - FIXME: add parameter
self.sleeptime = 5
def start(self):
self.processes = []
for interface in self.interfaces:
p = Process(target=self.run_interface, args=(interface,))
self.processes.append(p)
p.start()
def join(self):
for process in self.processes:
process.join()
def run_interface(self, interface):
while True:
self.trigger(interface)
time.sleep(self.sleeptime)
def trigger(self, interface):
packet = IPv6(dst=f"ff02::1%{interface}") / ICMPv6EchoRequest()
log.debug(f"Sending request on {interface}")
send(packet, verbose=self.verbose)
class Scanner(object):
"""
Scan for replies of hosts, maintain the up-to-date database
"""
def __init__(self, interfaces=None, args=None, outdir=None):
self.interfaces = interfaces
if outdir:
self.outdir = outdir
else:
self.outdir = os.path.join(os.environ['HOME'], '.cdist', 'scan')
def handle_pkg(self, pkg):
if ICMPv6EchoReply in pkg:
host = pkg['IPv6'].src
log.verbose(f"Host {host} is alive")
dir = os.path.join(self.outdir, host)
fname = os.path.join(dir, "last_seen")
now = datetime.datetime.now()
os.makedirs(dir, exist_ok=True)
# FIXME: maybe adjust the format so we can easily parse again
with open(fname, "w") as fd:
fd.write(f"{now}\n")
def start(self):
self.process = Process(target=self.scan)
self.process.start()
def join(self):
self.process.join()
def scan(self):
log.debug("Scanning - zzzzz")
sniff(iface=self.interfaces,
filter="icmp6",
prn=self.handle_pkg)
if __name__ == '__main__':
t = Trigger(interfaces=["wlan0"])
t.start()
# Scanner can listen on many interfaces at the same time
s = Scanner(interfaces=["wlan0"])
s.scan()
# Join back the trigger processes
t.join()
# Test in my lan shows:
# [18:48] bridge:cdist% ls -1d fe80::*
# fe80::142d:f0a5:725b:1103
# fe80::20d:b9ff:fe49:ac11
# fe80::20d:b9ff:fe4c:547d
# fe80::219:d2ff:feb2:2e12
# fe80::21b:fcff:feee:f446
# fe80::21b:fcff:feee:f45c
# fe80::21b:fcff:feee:f4b1
# fe80::21b:fcff:feee:f4ba
# fe80::21b:fcff:feee:f4bc
# fe80::21b:fcff:feee:f4c1
# fe80::21d:72ff:fe86:46b
# fe80::42b0:34ff:fe6f:f6f0
# fe80::42b0:34ff:fe6f:f863
# fe80::42b0:34ff:fe6f:f9b2
# fe80::4a5d:60ff:fea1:e55f
# fe80::77a3:5e3f:82cc:f2e5
# fe80::9e93:4eff:fe6c:c1f4
# fe80::ba69:f4ff:fec5:6041
# fe80::ba69:f4ff:fec5:8db7
# fe80::bad8:12ff:fe65:313d
# fe80::bad8:12ff:fe65:d9b1
# fe80::ce2d:e0ff:fed4:2611
# fe80::ce32:e5ff:fe79:7ea7
# fe80::d66d:6dff:fe33:e00
# fe80::e2ff:f7ff:fe00:20e6
# fe80::f29f:c2ff:fe7c:275e