166 lines
4.8 KiB
Python
166 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2020 Nico Schottelius (nico-cdist at schottelius.org)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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#
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# Interface to be implemented:
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# - cdist scan --mode {scan, trigger, install, config}, --mode can be repeated
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# scan: scan / listen for icmp6 replies
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# trigger: send trigger to multicast
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# config: configure newly detected hosts
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# install: install newly detected hosts
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#
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# Scanner logic
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# - save results to configdir:
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# basedir = ~/.cdist/scan/<ipv6-address>
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# last_seen = ~/.cdist/scan/<ipv6-address>/last_seen -- record unix time or similar
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# last_configured = ~/.cdist/scan/<ipv6-address>/last_configured -- record unix time or similar
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# last_installed = ~/.cdist/scan/<ipv6-address>/last_configured -- record unix time or similar
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#
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#
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#
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#
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# cdist scan --list
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# Show all known hosts including last seen flag
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#
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# Logic for reconfiguration:
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#
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# - record when configured last time
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# - introduce a parameter --reconfigure-after that takes time argument
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# - reconfigure if a) host alive and b) reconfigure-after time passed
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#
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from multiprocessing import Process
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import os
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# FIXME: fail gracefully if non existent - i.e. "scapy required for scanner - please install python3-scapy"
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from scapy.all import *
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# Datetime overwrites scapy.all.datetime - needs to be imported AFTER
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import datetime
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class Trigger(object):
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"""
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Trigger an ICMPv6EchoReply from all hosts that are alive
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"""
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def __init__(self, interfaces=None, verbose=False):
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self.interfaces = interfaces
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self.verbose = verbose
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# Wait 5 seconds before triggering again - FIXME: add parameter
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self.sleeptime = 5
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def start(self):
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self.processes = []
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for interface in self.interfaces:
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p = Process(target=self.run_interface, args=(interface,))
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self.processes.append(p)
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p.start()
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def join(self):
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for process in self.processes:
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process.join()
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def run_interface(self, interface):
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while True:
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self.trigger(interface)
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time.sleep(self.sleeptime)
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def trigger(self, interface):
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packet = IPv6(dst=f"ff02::1%{interface}") / ICMPv6EchoRequest()
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send(packet, verbose=self.verbose)
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class Scanner(object):
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"""
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Scan for replies of hosts, maintain the up-to-date database
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"""
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def __init__(self, interfaces=None, outdir=None):
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self.interfaces = interfaces
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if outdir:
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self.outdir = outdir
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else:
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self.outdir = "."
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def handle_pkg(self, pkg):
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if ICMPv6EchoReply in pkg:
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host = pkg['IPv6'].src
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print(f"Host {host} is alive")
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dir = os.path.join(self.outdir, host)
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fname = os.path.join(dir, "last_seen")
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now = datetime.datetime.now()
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os.makedirs(dir, exist_ok=True)
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# FIXME: maybe adjust the format so we can easily parse again
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with open(fname, "w") as fd:
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fd.write(f"{now}\n")
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def scan(self):
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sniff(iface=self.interfaces,
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filter="icmp6",
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prn=self.handle_pkg)
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if __name__ == '__main__':
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t = Trigger(interfaces=["wlan0"])
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t.start()
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# Scanner can listen on many interfaces at the same time
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s = Scanner(interfaces=["wlan0"])
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s.scan()
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# Join back the trigger processes
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t.join()
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# Test in my lan shows:
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# [18:48] bridge:cdist% ls -1d fe80::*
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# fe80::142d:f0a5:725b:1103
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# fe80::20d:b9ff:fe49:ac11
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# fe80::20d:b9ff:fe4c:547d
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# fe80::219:d2ff:feb2:2e12
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# fe80::21b:fcff:feee:f446
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# fe80::21b:fcff:feee:f45c
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# fe80::21b:fcff:feee:f4b1
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# fe80::21b:fcff:feee:f4ba
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# fe80::21b:fcff:feee:f4bc
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# fe80::21b:fcff:feee:f4c1
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# fe80::21d:72ff:fe86:46b
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# fe80::42b0:34ff:fe6f:f6f0
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# fe80::42b0:34ff:fe6f:f863
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# fe80::42b0:34ff:fe6f:f9b2
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# fe80::4a5d:60ff:fea1:e55f
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# fe80::77a3:5e3f:82cc:f2e5
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# fe80::9e93:4eff:fe6c:c1f4
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# fe80::ba69:f4ff:fec5:6041
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# fe80::ba69:f4ff:fec5:8db7
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# fe80::bad8:12ff:fe65:313d
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# fe80::bad8:12ff:fe65:d9b1
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# fe80::ce2d:e0ff:fed4:2611
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# fe80::ce32:e5ff:fe79:7ea7
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# fe80::d66d:6dff:fe33:e00
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# fe80::e2ff:f7ff:fe00:20e6
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# fe80::f29f:c2ff:fe7c:275e
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