82 lines
2 KiB
Python
Executable file
82 lines
2 KiB
Python
Executable file
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import argparse
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import os
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import re
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import shutil
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import socket
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import sys
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HOME = os.environ['HOME']
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KNOWN_HOSTS = os.path.join(HOME, '.ssh', 'known_hosts')
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def parse_args():
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parser = argparse.ArgumentParser(description='Cleanup known_hosts file')
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parser.add_argument('-s', '--strip-ips', action='store_true', dest='strip')
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return parser.parse_args()
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def backup():
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# Backup known hosts file
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shutil.copyfile(KNOWN_HOSTS, KNOWN_HOSTS+".old")
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def is_ip(ip):
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try:
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socket.inet_aton(ip)
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return True
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except socket.error:
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return False
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def read_and_reduce():
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# Read known hosts to memory
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knownhosts = {}
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with open(KNOWN_HOSTS) as f:
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for line in f:
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if line.strip() == "" or line.strip().startswith("#"):
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continue
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hosts, keytype, fingerprint = line.strip().split(" ")
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dictkey = keytype + fingerprint
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hosts = hosts.split(",")
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if knownhosts.get(dictkey) == None:
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knownhosts[dictkey] = {
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'hosts': set(),
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'keytype': keytype,
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'fingerprint': fingerprint,
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}
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knownhosts[dictkey]['hosts'].update(hosts)
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return knownhosts
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def write_hosts_file(knownhosts):
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# Replace known hosts with a cleaned version
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with open(KNOWN_HOSTS, 'w') as f:
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for key, host in knownhosts.items():
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if len(host['hosts']) == 0:
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continue
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host['hosts_joined'] = ",".join(sorted(host['hosts'], reverse=True))
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f.write("{hosts_joined} {keytype} {fingerprint}\n".format(**host))
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def main():
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args = parse_args()
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backup()
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known_hosts = read_and_reduce()
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if args.strip:
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for k in known_hosts:
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known_hosts[k]['hosts'] = [h for h in known_hosts[k]['hosts']
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if not is_ip(h)]
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write_hosts_file(known_hosts)
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print("OK. Cleaned up", KNOWN_HOSTS)
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if __name__ == "__main__":
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main()
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