XS4ALL Diablo patches

I'm running the diablo NNTP software on our newszilla usenet cluster at XS4ALL.

We're using the diablo-6-CUR-20170901-00 version from the development snapshots.

Debian init.d script

We run diablo on Debian/Linux systems, and we store the history file on ramfs (note, not tmpfs, as that can get swapped out, if that happens performance is worse than any other disk-based filesystem. Ramfs cannot get swapped out.). This is the /etc/init.d/diablo file that sets it all up:

. Ofcourse there's a matching /etc/init.d/dreaderd file, which sources a /etc/default/dreaderd file for config settings: (version init-20110628)

New set of /news/adm scripts

The sample administration script that ship with diablo are meant to be customized for your local setup. Unfortunately they were written in C shell. I did a rewrite in standard /bin/sh, which in most cases you do not have to customize at all. They automatically detect if dreaderd or diablo are running, and run only if needed. Just call the scripts from news' crontab and you're all set. (version adm-20180207)

libradius-linux patch

We use libradius-linux on our Linux systems to get the Diablo radius support to work. It's an (old, but working) port of the FreeBSD radius library. You're supposed to link it with the libmd MD5 library, but I like to keep dependencies to a minimum so I patched it to link with libcrypto from openssl instead (which is almost certainly included with your linux distro). (version libradius-linux-20040827)

Diablo patches

Finally, these are the patches we use on top of diablo-6-CUR-20170901-00:
(version patches-20180825)

Compilation fixes

01_dreader-rlimit-fix.patch Fix compilation problem with rlimit, include <resource.h>
02_diablo-gzfile-is-already-pointer.patch The gzFile type used in zlib is already a pointer, and it should be used as 'gzFile', not '*gzFile'.

Bug fixes

03_dreader-getsockname-crash.patch In some cases the getsockname() call fails and returns -1. dreaderd goes on processing the connection and coredumps in dns.c::DnsTest(). This leaks filedescriptors, and it gets worse from there. Fix it by simply closing the filedescriptor and returning.

Optional enhancements

10_dreader-dr_lflags.patch Add DR_LFLAGS (dreader LFLAGS) so that only dreaderd is linked with -lradius, -ldb etc
11_dreader-default-large-artno.patch Enable large article numbers (>2147483647) by default. This doesn't conform to RFC3977 paragraph 6, which says "Article numbers MUST lie between 1 and 2,147,483,647, inclusive." but most clients support it anyway. However RFC3977 also says "Note that it is likely that the article number limit of 2,147,483,647 will be increased by a future revision or extension to this specification."
12_dreader-vserver-multiple-interfaces-cidr.patch This patch allows one to use multiple 'interface' statements in a vserver definition, like an IPv4 and an IPv6 one. Additionally, the address argument can be a CIDR address/mask expression.
13_dreader-maxconn-per-vserver.patch Count 'maxconnperhost, maxconnpergroup, maxconnperuser only in the context of the current vserver. So if user with ip a.b.c.d connects to VSERVER1 that connection will not be counted in VSERVER2.
14_dreader-requiregroupcmd.patch If in a readerdef 'requiregroupcmd' is set to 'yes', a client can only use STAT/ARTICLE/HEAD/BODY after a group (any group) has successfully been entered. Useful on textservers that are hammered by binary download clients for message-ids that are not available anyway.
 
This does not block POST/IHAVE at the moment.
15_dreader-vs-hostname-default.patch If in a vserverdef the "hostname" attribute is set to "DEFAULT", the default hostname will be filled in instead of ""
16_dreader-maxagepolicy.patch There is a readerdef setting called "maxagepolicy". It sets a limit to the age of the article that is retrieved by dreaderd from a backend server. The value is in seconds. This setting is undocumented and it looks like it was never implemented fully - but it's only a small patch to make it work. Note that this does not set a limit on HEAD commands or overview data (which is local).
17_dreader-ipv6-hosts.patch Support IPv6 for hosts in dserver.hosts.
18_diablo-dsyncgroups-ipv6.patch IPv6 support for dsyncgroups
19_dreader-modern-crypto.patch If POST_CRYPTXTRACE is enabled for X-Trace header encryption, use AES256 instead of DES (which doesn't even compile anymore....). In that case also use SHA512 instead of MD5 for NNTP-Posting-Host mangling.

XS4ALL local enhancements

20_diablo-xs4all-config.patch XS4ALL/Newszilla compile settings
21_dreader-rad-readerdef.patch Make it possible to return dreader.access attributes in a radius reply
22_dreader-friendly-maxconn-msgs.patch Change messages like "Your host connection limit reached" into "Too many connections from your host (max %d)", etc, because they were confusing users ("I thought there was no download limit!").
23_diablo-xclient.patch Support for XCLIENT
24_dreader-banner-short-hostname.patch Add '%H' to the variables available for the welcome banner. It expands to the short hostname (up to the first dot, no domain).
25_diablo-cascading-hashfeed.patch Support for cascading hashfeeds. You can now define multiple groups of hashfeeds by seperating them with a '|' (pipe) sign. All groups must have a match in order to have a complete match. Each extra group uses an extra offset of 4 bytes. So this:
 
1/3|4-5/20,19-20/20
 
means:
 
must match 1/3 AND 4-5/20:4,19-20/20:4
 
Yes, the 'and' symbol is usually a '&' (ampersand) but that looks really ugly.
26_dreader-haproxy.patch Support the HAPROXY protocol, so that haproxy can be used as a TLS offloader.
27_dreader-radius-remoteip.patch Put the connecting remote IP address in the RAD_CALLING_STATION_ID attribute for RADIUS authentication requests

Experimental patches

40_diablo-zalloc-debug.patch Keep a shadow administration of mempools and memnodes, and dump usage to a file in /news/run on SIGUSR2. Helped a lot with debugging, but has a lot of overhead when enabled (compile-time setting).

For diablo stuff I'm currently mikevs [at] xs4all.net.