174 lines
7.1 KiB
Python
174 lines
7.1 KiB
Python
"""
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dealing with the fault counters and available/abuse/abuse_blocked flags
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"""
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import traceback
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from optparse import make_option
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from django.core.management.base import BaseCommand
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from django.core.mail import send_mail
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from django.db import transaction
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from django.utils.translation import ugettext_lazy as _
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from nsupdate.main.models import Host
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from nsupdate.utils.mail import translate_for_user, send_mail_to_user
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ABUSE_MSG = _("""\
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Your host: %(fqdn)s (comment: %(comment)s)
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Issue: The abuse flag for your host was set.
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Explanation:
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The abuse flag usually gets set if your update client sends way too many
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updates although your IP address did not change.
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Your update client sent %(faults_count)d faulty updates since we last checked.
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We have reset the faults counter to 0 now, but we are rejecting updates
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for this host until you resolve the issue.
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Resolution:
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You can easily do this on your own:
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1. fix or replace the update client on this host - it must not send
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updates if the IP did not change
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2. visit the service web interface and remove the abuse flag for this host
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Notes:
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- this is usually caused by a misbehaving / faulty update client
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(on your PC / server or router / firewall)
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- the dyndns2 standard explicitly states that frequently sending
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nochg updates is considered abuse of the service
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- you are using way more resources on the service than really needed
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- for Linux and similar OSes, you can use the ddclient software - we
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give copy&paste-ready configuration help for it on our web UI
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- if you need something else, use anything that can be considered
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a valid, well-behaved dyndns2-compatible update client
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- if you already used such a software and you ran into this problem,
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complain to whoever wrote it about it sending nochg updates
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""")
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class Command(BaseCommand):
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help = 'deal with the faults counters'
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option_list = BaseCommand.option_list + (
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make_option('--show-server',
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action='store_true',
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dest='show_server',
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default=False,
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help='show server fault counters',
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),
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make_option('--show-client',
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action='store_true',
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dest='show_client',
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default=False,
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help='show client fault counters',
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),
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make_option('--reset-server',
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action='store_true',
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dest='reset_server',
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default=False,
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help='reset the server fault counters of all hosts',
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),
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make_option('--reset-client',
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action='store_true',
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dest='reset_client',
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default=False,
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help='reset the client fault counters of all hosts',
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),
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make_option('--reset-abuse',
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action='store_true',
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dest='reset_abuse',
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default=False,
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help='reset the abuse flag (to False) of all hosts',
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),
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make_option('--reset-abuse-blocked',
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action='store_true',
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dest='reset_abuse_blocked',
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default=False,
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help='reset the abuse_blocked flag (to False) of all hosts',
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),
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make_option('--reset-available',
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action='store_true',
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dest='reset_available',
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default=False,
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help='reset the available flag (to True) of all hosts',
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),
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make_option('--flag-abuse',
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action='store',
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dest='flag_abuse',
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default=None,
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type='int',
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help='if client faults > N then set abuse flag and reset client faults',
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),
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make_option('--notify-user',
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action='store_true',
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dest='notify_user',
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default=False,
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help='notify the user by email when host gets flagged for abuse',
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),
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)
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def handle(self, *args, **options):
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show_client = options['show_client']
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show_server = options['show_server']
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reset_client = options['reset_client']
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reset_server = options['reset_server']
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reset_available = options['reset_available']
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reset_abuse = options['reset_abuse']
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reset_abuse_blocked = options['reset_abuse_blocked']
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flag_abuse = options['flag_abuse']
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notify_user = options['notify_user']
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for h in Host.objects.all():
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try:
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with transaction.atomic():
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if show_client or show_server:
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output = u""
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if show_client:
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output += u"%-6d " % h.client_faults
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if show_server:
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output += u"%-6d " % h.server_faults
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output += u"%s %s\n" % (h.created_by.username, h.get_fqdn(), )
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self.stdout.write(output)
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if (flag_abuse is not None or reset_client or reset_server or
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reset_available or reset_abuse or reset_abuse_blocked):
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if flag_abuse is not None:
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if h.client_faults > flag_abuse:
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h.abuse = True
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faults_count = h.client_faults
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h.client_faults = 0
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fqdn = h.get_fqdn()
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comment = h.comment
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creator = h.created_by
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self.stdout.write(
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"setting abuse flag for host %s (created by %s, client faults: %d)\n" % (
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fqdn, creator, faults_count))
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if notify_user:
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subject, msg = translate_for_user(
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creator,
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_("issue with your host %(fqdn)s"),
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ABUSE_MSG
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)
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subject = subject % dict(fqdn=fqdn)
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msg = msg % dict(fqdn=fqdn, comment=comment, faults_count=faults_count)
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send_mail_to_user(creator, subject, msg)
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if reset_client:
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h.client_faults = 0
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if reset_server:
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h.server_faults = 0
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if reset_available:
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h.available = True
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if reset_abuse:
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h.abuse = False
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if reset_abuse_blocked:
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h.abuse_blocked = False
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h.save()
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except Exception:
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try:
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msg = u"The following Exception occurred when processing host %s!\n" % (h.get_fqdn(), )
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self.stderr.write(msg)
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except Exception:
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pass
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traceback.print_exc()
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