The log source in .NET

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The log source
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First, Listing 7-4 shows an example of a log source.
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Listing 7-4: syslog-ng Configuration for iptables Source
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source src { # # include internal syslog-ng messages # note: the internal() source is required! # internal();
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7 Logging
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# # the following line will be replaced by the # socket list generated by SuSEconfig using # variables from /etc/sysconfig/syslog: # unix-dgram( /dev/log ); unix-dgram( /var/lib/ntp/dev/log ); # # uncomment to process log messages from network: # #udp(ip( 0.0.0.0 ) port(514)); };
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Listing 7-4 shows the source definition for the entire syslog-ng process. This example shows two logging sources, /dev/log (for the standard kernel logging device) and /var/lib/ntp/dev/log. A separate entry is necessary because the NTP service runs in a chroot jail and its log source has to reside under this jail so that the ntp executable can access it. This example also shows a UDP entry that SUSE has commented out. This is a logging source entry for a network port. This is how you can set up a central logging server for your organization. By setting a source to be UDP on port 514, you are enabling your machine to accept messages for logging from remote hosts. TCP/IP port 514 on UDP is the standard port entry for syslog messages. If you uncomment this entry, you are able to receive messages from remote hosts.
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CrossReference For more information on TCP/IP and specifying addresses and ports in Linux, see s 6 and 15.
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The filter
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Next, Listing 7-5 gives an example of a syslog-ng filter.
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Listing 7-5: The Filter
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filter f_iptables { facility(kern) and match( IN= ) and match( OUT= ); };
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A filter in syslog-ng is the same as the first field in the syslog.conf file but has the capability to be much more granular. In the example shown in Listing 7-5, you are defining a filter named f_iptables. This filter filters out messages that have the logging facility of KERN (kernel) and uses a regular expression comparison to match a message if it contains the words IN or OUT. The regular expression capabilities of syslog-ng enable you to eliminate or redirect logging messages based on examining their contents.
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Part II The SUSE System
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CrossReference
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We talk about firewalls and iptables in detail in 23. For now, you can tell iptables to log messages about a TCP/IP packet with a message prefix. For example, you can say that if a message has been denied INto your machine/network, then the message is prefixed with the word IN. The same is true for any messages that have been denied OUT of your network. In this case, you could tell syslog-ng to log these facts into a separate file for your perusal at a convenient time.
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The log destination
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Finally, Listing 7-6 shows an example of a log destination.
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Listing 7-6: The Destination
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destination firewall { file( /var/log/firewall ); };
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By default, SUSE comments this line out in order to send these messages to its default location. With most services in SUSE, all the output is sent to the /var/log/messages file because there is not a logging facility for each specific service. So, we assume we have uncommented the destination definition for use on our system so that firewall messages go to a specific destination. The destination specifies that the custom definition firewall will write log messages to the file /var/log/firewall. This enables you to examine firewallrelated messages (produced by the iptables facility, which filters network packets) by simply examining a specific log file.
The log definition tying it all together
These three definitions may all sound well and good in principle, but are you getting the feeling that there should be something to bring these three definitions together This is the final piece in the puzzle of syslog-ng. You need to configure a log parameter that will use these definitions and bring them into a coherent specification for a logging trigger, which is a log definition that ties a log source, specific filter, and specific destination together. Listing 7-7 brings together our disparate example definitions of log source, filter, and log destination into a final log definition.