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authorPaweł Redman <pawel.redman@gmail.com>2026-06-14 22:23:51 +0200
committerPaweł Redman <pawel.redman@gmail.com>2026-06-14 22:23:51 +0200
commitf13eee247a6f318e0bd9cabb878316e80ee916a0 (patch)
tree4e77208825fa673f7692df9d0c9b4ebb86a68688 /site/content/schachtmeister2.typ
parent62ef3bb5f7915d2326bcc9f351265107425fc087 (diff)
Migrate software pages to Typst
Co-authored-by: Cursor <cursoragent@cursor.com>
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-#import "/common.typ": post
-
-#show: post.with(
- title: "schachtmeister2",
- date: datetime(year: 2020, month: 8, day: 15),
-)
-
-`schachtmeister2` is a daemon for white- and blacklisting specified ISPs, hosting providers and so on. It was created for the Der Bunker Tremulous server to combat malicious players evading bans.
-
-The source code is available #link("https://redman.xyz/git/schachtmeister2")[here].
-
-The daemon works by looking up a given IP address in WHOIS databases and reverse DNS records and analyzing the results. Its configuration file, `schachts.list`, is a list of keywords to be searched for along with a *partial rating*. The program's output, the *rating*, is the sum of partial ratings of all matched keywords.
-
-= Usage
-
-Since the daemon is meant to be used with a Tremulous server, it communicates over UDP. The protocol is extremely simple. To query `schachtmeister2` send an UDP packet (port 1337) that looks like:
-
-```
-\xff\xff\xff\xffsm2query ADDRESS
-```
-
-Note the four leading `0xFF` bytes. The daemon will send a reply to the sender's address and port that will look like:
-
-```
-\xff\xff\xff\xffsm2reply ADDRESS RATING
-```
-
-Here's an example using BSD's netcat, asking for the rating of `8.8.8.8` (Google's DNS):
-
-```
-$ printf "\xff\xff\xff\xffsm2query 8.8.8.8" | nc -u 127.0.0.1 1337
-����sm2reply 8.8.8.8 0
-```
-
-= The list
-
-The daemon needs a list of keywords to operate meaningfully. The program looks for a file named `schachts.list` in its working directory. Below is an example list:
-
-```
-// a few known VPS and VPN providers
-revdns -50 tcpvpn.com
-revdns -50 vultr.com
-
-whois -50 "OVH"
-whois -50 "DigitalOcean"
-whois -50 "Digital Ocean"
-
-// Desala's ISP
-revdns -10 .dynamic.chello.pl
-```
-
-The columns are:
-
-- Where to look for the substring: `revdns` or `whois`?
-- The partial rating or how much the total rating changes if this substring is found.
-- The substring to look for. Use quotation marks if you need spaces. The program does not support regular expressions yet.
-
-Whitespace doesn't matter but I recommend tabs for proper alignment. You can use C++-style one-line comments.
-
-= Reloading on the fly
-
-Restarting the daemon clears its cache, so you might want to avoid it. To make `schachtmeister2` reload the list, send `SIGUSR1` to the process.
-
-= Limitations
-
-This is one of those programs that I've written quickly, as crude prototypes, but have worked exceedingly well. As I couldn't be bothered to rewrite the program better, it's not very flexible and works well only in a single application. I might continue working on it if there's demand outside of Tremulous.