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A syslog daemon written in C/Lua http://www.conman.org/software/syslog…
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There's more documentation here: http://boston.conman.org/2010/02/09.1 but most of the documentation exists in the source code. A good place to start is with syslogintr.c to get a feel for how the code works. Included are quite a few sample scripts, some of which are in production. These scripts are: brevard.lua The script running on my personal server. It maintains the original syslogd logfiles, plus it relays everything to my home server (as part of the syslogintr debugging process). It also checks to see if the webserver and nameserver are running, and if not, sends an email notification (I've had issues with both just stopping---I know why it happens; I can't fix the why though---long story). If the webserver is running, it will collect some stats and log those. This script will also collect messages from postfix until all the logs for a single email transaction have been collected, then logs a single one-line summary. debug.lua Simple script to make sure the table passed to Lua contains the proper information. minsys.lua Simple script to show a minimal, but fully functional, script that uses all the optional calls. northlauderdale.lua The script running on an application server. Again, this logs to the orginal syslogd logfiles, but this script also checks to make sure the webserver is running (it's prone to crash due to a resource limitation) and like brevard.lua, either send an email notification if the webserver isn't running, or log the current webserver stats. It will also check the kernel resources and logs any information it finds. realtime.lua This script is meant to be run with syslogintr in the foreground. It displays the messages it receives in realtime. Fun to watch. redhat.lua A script to act as a (more-or-less) drop-in replacement for syslogd on RedHat derived Linux distributions. relay.lua A script to test the relay() function. royal-oak.lua This one is running on a server that monitors a network using Cacti and Nagios. There are routers configured to send their information to this host, so when any OSPF changes happen, an email notification is sent. This too, also logs to the original syslogd logfiles. This system is also running Postfix, so the same Postfix summary that is done in brevard.lua is done here. sys.lua Another testing script. testbed.lua Used to test the various scripts here. It does not require syslogintr to be running---instead it feeds 192 test messages (each facility, each priority) to the user supplied log() function, and calls cleanup() if it exists. using.lua This is the script running on my workstation. I didn't bother using the original syslogd logfiles here so I log the information in one large file using a non-standard format that I happen to like. This script will check for failed ssh login attempts, and if there are 5 or more, it will add the IP address of the otherside to the firewall (iptables) so further attempts are blocked. It keeps a log of such entries and every hour it will remove the oldest entry (this to keep the iptables from growing uncontrollably) as the attacker will have moved on by then. This is also the recipient of the remote logging messages, although at this time, I don't really do any processing of the received messages. The various modules undet the modules/ directory: I_log.lua Supplies a few routines to log from within the scripts themselves. check_apache.lua Logs stats from Apache (requires mod_status), othersise, sends an email notification that Apache isn't running. check_bind.lua Checks to see if named is running (uses the Linux /proc filesystem for this), and if it isn't, sends an email notification that named isn't running. check_ospf.lua Checks to see if the message is from a Cisco router and is an OSPF neighbor state change. Sends an email notification if that is indeed the case. colortty.c Lua module to cut strings to the width of the tty. Used by realtime.lua to implement a realtime display of syslog messages. deltatime.lua Utility routine to format a time difference. hostcounts.lua Keeps track of hosts that send log messages. log_beancounter.lua Logs stats from an OpenVZ instance. postfix-mailsummary.lua Convert multiple Postfix log messages into one summary log message. proftp-iptables.lua Linux specific: block ProFTPd attempts using iptables. If you are using this, please make sure you run iptables -N proftp-block iptables -A INPUT -p tcp --dport 21 -j ssh-block sendmail.lua Module to send an email. ssh-iptables.lua Linux specific: block SSH attempts using iptables. If you are using this, please make sure you run iptables -N ssh-block iptables -A INPUT -p tcp --dport 22 -j ssh-block template.lua Utility routine to format output according to a template.