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  14    <H1>[IRCServices] known services &amp;quot;abuse&amp;quot;?</H1>
  15     <B>Andrew Church</B>
  16     <A HREF="mailto:ircservices%40ircservices.za.net?Subject=%5BIRCServices%5D%20known%20services%20%26quot%3Babuse%26quot%3B%3F&In-Reply-To="
  17        TITLE="[IRCServices] known services &amp;quot;abuse&amp;quot;?">achurch at dragonfire.net
  18        </A><BR>
  19     <I>Sun Oct  8 14:36:19 PDT 2000</I>
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  34 <PRE>     Replying to two messages at once:
  35
  36 &gt;<i>Hey,
  37 </I>&gt;<i>lately I've noticed this error message coming up quite often:
  38 </I>&gt;<i>
  39 </I>&gt;<i>Global -- from services.mircx.com:
  40 </I>&gt;<i>Warning: unable to set modes on channel #rena. Are your servers' U:lines configured correctly?
  41 </I>&gt;<i>
  42 </I>&gt;<i>The channel is known to have script-kiddies in it and when I started
  43 </I>&gt;<i>investigating about that a bit I heard they found a way to &quot;abuse&quot; the
  44 </I>&gt;<i>servs, most likely Chanserv.
  45 </I>
  46      I suspect what's happening is that someone is deliberately changing
  47 channel modes against a modelock.  The U-line error detection code works
  48 by checking the number of times a MODE message is received for a given
  49 channel in a given period of time; if it exceeds a built-in limit (I
  50 think it's three messages in one second), the code assumes that the
  51 server is cancelling its mode changes and displays the U-line error
  52 message.  The code does check that the mode sender has a period in their
  53 nickname, though; does your server allow nicknames with periods in them?
  54 If so, it's in violation of the RFC and should be fixed; if not, I'd be
  55 interested in seeing a debug log of this problem happening.
  56
  57 &gt;<i>A problem I have had with relation to Operserv and Chanserv.
  58 </I>&gt;<i>Chanserv can op a user on a channel but OperServ can't op the same person.
  59 </I>&gt;<i>Operserv complains about ulines not being configured correctly.
  60 </I>[...]
  61 &gt;<i>For whatever reason, it has now stopped giving this error. I can't help
  62 </I>&gt;<i>much as to why it started working all of a sudden, but the only thing that
  63 </I>&gt;<i>comes to mind is that the system was rebooted, though i doubt this is
  64 </I>&gt;<i>related. Restarting services or the ircd had no effect whatsoever.
  65 </I>
  66      This can happen if at some time in the past Services determined that
  67 mode setting didn't work (as above).  Actually, OP/DEOP shouldn't work
  68 then either; that's a bug.  Restarting Services ought to fix it,
  69 unless/until Services has a problem setting modes again.
  70
  71   --Andrew Church
  72     <A HREF="http://www.ircservices.za.net/mailman/listinfo/ircservices">achurch at dragonfire.net</A>
  73     <A HREF="http://achurch.dragonfire.net/">http://achurch.dragonfire.net/</A>
  74
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  79
  80 </PRE>
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