[scanner] implement the --list flag

This commit is contained in:
fnux 2021-04-22 10:20:49 +02:00
parent a4464209b6
commit bb24d632d6
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GPG key ID: 4502C902C00A1E12
3 changed files with 67 additions and 17 deletions

View file

@ -486,6 +486,10 @@ def get_parsers():
'-m', '--mode', help='Which modes should run',
action='append', default=[],
choices=['scan', 'trigger'])
parser['scan'].add_argument(
'--list',
action='store_true',
help='List the known hosts and exit')
parser['scan'].add_argument(
'--config',
action='store_true',

View file

@ -21,26 +21,11 @@
import logging
import sys
from datetime import datetime
log = logging.getLogger("scan")
# CLI processing is defined outside of the main scan class to handle
# non-available optional scapy dependency (instead of crashing mid-flight).
def commandline(args):
log.debug(args)
# Check if we have the optional scapy dependency available.
try:
import cdist.scan.scan as scan
except ModuleNotFoundError:
log.error('cdist scan requires scapy to be installed. Exiting.')
sys.exit(1)
# Default operation mode.
if not args.mode:
# By default scan and trigger, but do not call any action.
args.mode = ['scan', 'trigger', ]
def run(scan, args):
# We run each component in a separate process since they
# must not block on each other.
processes = []
@ -59,3 +44,47 @@ def commandline(args):
for process in processes:
process.join()
def list(scan, args):
s = scan.Scanner(interfaces=args.interfaces, args=args)
hosts = s.list()
# A full IPv6 addresses id composed of 8 blocks of 4 hexa chars +
# 6 colons.
ipv6_max_size = 8 * 4 + 10
# We format dates as follow: YYYY-MM-DD HH:MM:SS
date_max_size = 8 + 2 + 6 + 2
print("{} | {}".format(
'link-local address'.ljust(ipv6_max_size),
'last seen'.ljust(date_max_size)))
print('=' * (ipv6_max_size + 3 + date_max_size))
for addr in hosts:
last_seen = datetime.strftime(
datetime.strptime(hosts[addr]['last_seen'].strip(), '%Y-%m-%d %H:%M:%S.%f'),
'%Y-%m-%d %H:%M:%S')
print("{} | {}".format(addr.ljust(ipv6_max_size),last_seen.ljust(date_max_size)))
# CLI processing is defined outside of the main scan class to handle
# non-available optional scapy dependency (instead of crashing mid-flight).
def commandline(args):
log.debug(args)
# Check if we have the optional scapy dependency available.
try:
import cdist.scan.scan as scan
except ModuleNotFoundError:
log.error('cdist scan requires scapy to be installed. Exiting.')
sys.exit(1)
# Set default operation mode.
if not args.mode:
# By default scan and trigger, but do not call any action.
args.mode = ['scan', 'trigger', ]
# Print known hosts and exit is --list is specified - do not start
# the scanner.
if args.list:
list(scan, args)
else:
run(scan, args)

View file

@ -132,6 +132,23 @@ class Scanner(object):
with open(fname, "w") as fd:
fd.write(f"{now}\n")
def list(self):
hosts = dict()
for linklocal_addr in os.listdir(self.outdir):
workdir = os.path.join(self.outdir, linklocal_addr)
# We ignore any (unexpected) file in this directory.
if os.path.isdir(workdir):
last_seen='-'
last_seen_file = os.path.join(workdir, 'last_seen')
if os.path.isfile(last_seen_file):
with open(last_seen_file, "r") as fd:
last_seen = fd.readline()
hosts[linklocal_addr] = {'last_seen': last_seen}
return hosts
def config(self):
"""
Configure a host