229 lines
7.2 KiB
Python
229 lines
7.2 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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from multiprocessing import Process
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import os
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import logging
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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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import cdist.config
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logging.basicConfig(level=logging.DEBUG)
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log = logging.getLogger("scan")
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datetime_format = '%Y-%m-%d %H:%M:%S'
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class Host(object):
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def __init__(self, addr, outdir, name_mapper=None):
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self.addr = addr
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self.workdir = os.path.join(outdir, addr)
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self.name_mapper = name_mapper
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os.makedirs(self.workdir, exist_ok=True)
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def __get(self, key, default=None):
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fname = os.path.join(self.workdir, key)
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value = default
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if os.path.isfile(fname):
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with open(fname, "r") as fd:
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value = fd.readline()
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return value
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def __set(self, key, value):
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fname = os.path.join(self.workdir, key)
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with open(fname, "w") as fd:
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fd.write(f"{value}")
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def name(self, default=None):
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if self.name_mapper is None:
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return default
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fpath = os.path.join(os.getcwd(), self.name_mapper)
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if os.path.isfile(fpath) and os.access(fpath, os.X_OK):
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out = subprocess.run([fpath, self.addr], capture_output=True)
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if out.returncode != 0:
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return default
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else:
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value = out.stdout.decode()
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return (default if len(value) == 0 else value)
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else:
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return default
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def address(self):
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return self.addr
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def last_seen(self, default=None):
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raw = self.__get('last_seen')
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if raw:
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return datetime.datetime.strptime(raw, datetime_format)
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else:
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return default
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def last_configured(self, default=None):
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raw = self.__get('last_configured')
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if raw:
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return datetime.datetime.strptime(raw, datetime_format)
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else:
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return default
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def seen(self):
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now = datetime.datetime.now().strftime(datetime_format)
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self.__set('last_seen', now)
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# XXX: There's no easy way to use the config module without feeding it with
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# CLI args. Might as well call everything from scratch!
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def configure(self):
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target = self.name() or self.address()
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cmd = ['cdist', 'config', '-v', target]
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fname = os.path.join(self.workdir, 'last_configuration_log')
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with open(fname, "w") as fd:
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log.debug("Executing: %s", cmd)
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completed_process = subprocess.run(cmd, stdout=fd, stderr=fd)
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if completed_process.returncode != 0:
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log.error("%s return with non-zero code %i - see %s for \
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details.", cmd, completed_process.returncode, fname)
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now = datetime.datetime.now().strftime(datetime_format)
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self.__set('last_configured', now)
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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, sleeptime, verbose=False):
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self.interfaces = interfaces
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# Used by scapy / send in trigger/2.
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self.verbose = verbose
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# Delay in seconds between sent ICMPv6EchoRequests.
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self.sleeptime = sleeptime
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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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try:
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log.debug("Sending ICMPv6EchoRequest on %s", interface)
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packet = IPv6(
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dst="ff02::1%{}".format(interface)
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) / ICMPv6EchoRequest()
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send(packet, verbose=self.verbose)
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except Exception as e:
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log.error("Could not send ICMPv6EchoRequest: %s", e)
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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, autoconfigure=False, outdir=None,
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name_mapper=None):
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self.interfaces = interfaces
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self.autoconfigure = autoconfigure
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self.name_mapper = name_mapper
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self.config_delay = datetime.timedelta(seconds=3600)
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if outdir:
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self.outdir = outdir
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else:
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self.outdir = os.path.join(os.environ['HOME'], '.cdist', 'scan')
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os.makedirs(self.outdir, exist_ok=True)
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self.running_configs = {}
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def handle_pkg(self, pkg):
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if ICMPv6EchoReply in pkg:
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host = Host(pkg['IPv6'].src, self.outdir, self.name_mapper)
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if host.name():
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log.verbose("Host %s (%s) is alive", host.name(),
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host.address())
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else:
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log.verbose("Host %s is alive", host.address())
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host.seen()
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# Configure if needed.
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if self.autoconfigure and \
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host.last_configured(default=datetime.datetime.min) + \
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self.config_delay < datetime.datetime.now():
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self.config(host)
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def list(self):
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hosts = []
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for addr in os.listdir(self.outdir):
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hosts.append(Host(addr, self.outdir, self.name_mapper))
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return hosts
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def config(self, host):
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if host.name() is None:
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log.debug("config - could not resolve name for %s, aborting.",
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host.address())
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return
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previous_config_process = self.running_configs.get(host.name())
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if previous_config_process is not None and \
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previous_config_process.is_alive():
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log.debug("config - is already running for %s, aborting.",
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host.name())
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log.info("config - running against host %s (%s).", host.name(),
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host.address())
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p = Process(target=host.configure())
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p.start()
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self.running_configs[host.name()] = p
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def start(self):
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self.process = Process(target=self.scan)
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self.process.start()
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def join(self):
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self.process.join()
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def scan(self):
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log.debug("Scanning - zzzzz")
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try:
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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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except Exception as e:
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log.error("Could not start listener: %s", e)
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