fix remote denial of service #21
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I nickname this the Lalufu exploit: Tweets by special nicknames like '__indexes', '__windows' and so on will corrupt internal data structures and most likely result in a "Not an ARRAY reference" error and crash the whole twirssi.pl script. Subsequent restarts of the script (if the crash is noticed in the first place) will most likely result in another crash as the offending tweet will most likely be downloaded again. It is trivial to register one of these usernames and with a single tweet containing the #twirssi hashtag, it is possible to crash many twirssi instances netwide at once as twirssi users are likely to follow the #twirssi hashtag. The fix is rather simple and blunt: it blackholes any tweets coming from those nicks. In the long run, the internal $state reprensentation should be refactored.
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Special nicks can crash irssi, for details see the commit log entry.
Should be fixed before somebody actually exploits this :-)