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##
## Samba-EventLog-HOWTO.txt
## Brian Moran <bmoran@centeris.com>
##
## Feature Introduced in Samba 3.0.21
##

Samba and Eventlogs
===================

Samba servers now support event logs -- this means that if 
Samba is configured correctly, the usual administration tools 
like event viewer will work against a Samba server. 

To minimally configure Samba to publish event logs, the
eventlogs to list must be specified in smb.conf, and 
eventlog entries must be written to those eventlogs. 

Optionally, a message file can be registered for each 
of the eventlog 'sources' to pretty-print the eventlog 
messages in the eventlog viewer. 

Configuring smb.conf
====================

To specify the list of eventlogs the eventlog list 
command is used. An example which will show four 
eventlogs is 

	eventlog list = Application System Security  SyslogLinux

When Samba initially starts, it looks to see if the 
eventlog directory, and a particular log exists; if not, 
the  directory and file are created under LOCK_DIR 

Writing EventLog Records
========================

The eventlogadm command is used to write records 
into a particular eventlog. Eventlogadm expects records 
to be on STDIN in the following format

	LEN: 0
	RS1: 1699505740
	RCN: 0
	TMG: 1128631322
	TMW: 1128631322
	EID: 1000
	ETP: INFO
	ECT: 0
	RS2: 0
	CRN: 0
	USL: 0
	SRC: cron
	SRN: dmlinux
	STR: (root) CMD ( rm -f /var/spool/cron/lastrun/cron.hourly)
	DAT: 

These fields closely mirror the eventlog structures 
used by the APIs.  The definitions of the fields are 

- LEN: <integer>  The length field is calculated by the
  eventlogadm program based on the rest of the information 
  in the record.  Zero works well here.
- RS1: 1699505740 A "magic number", the primary purpose of
  which seems to be to be able to find eventlog records in a 
  sea of binary data 
- TMG: <integer>  The time the eventlog record was generated;
  format is the number of seconds since 00:00:00 January 1, 
  1970, UTC
- TMW: <integer>  The time the eventlog record was written;
  format is the number of seconds since 00:00:00 January 1, 
  1970, UTC
- EID: <integer>  The eventlog ID -- used as a index to a
  message string in a message DLSamba and Eventlogs
- ETP: <string>   The event type -- one of INFO, ERROR,
  WARNING, AUDIT SUCCESS, AUDIT FAILURE
- ECT: <integer>  The event category; this depends on the
  message file -- primarily used as a means of filtering in 
  the eventlog viewer
- RS2: 0 Another reserved field
- CRN: 0 Yet another reserved field
- USL: <integer>  Typically would contain the length of the
  SID of the user object associated with this event. This is 
  not supported now, so leave this zero.
- SRC: <string>   The source name associated with the event
  log, e.g. "cron" or "smbd". If a message file is used with an 
  event log, there will be a registry entry for associating 
  this source name with a message file DLL
- SRN: <string>   The name of the machine on which the
  eventlog was generated. This is typically the host name
- STR: <string>   The text associated with the eventlog. Note
  that there may be more than one strings in a record
- DAT: <string>   Eventlog records can have binary information
  associated with them. DAT only supports ASCII strings however

Typically, one would set up a program to gather events, format 
them into records, and pipe them into eventlogadm for a 
particular eventlog:

# tail -f /var/log/messages |\
	my_program_to_parse_into_eventlog_records |\
	eventlogadm SyslogLinux

Note that individual records are separated on the input by one 
or more blank lines. In this manner, eventlogadm will just wait 
for more input, writing to the underlying log files as necessary.


Deciphering EventLog entries on the Client
==========================================

To set up an eventlog source (which is used by the eventlog viewer
program to pretty-print eventlog records), create a message file 
DLL,  then use the eventlogadm program to write the appropriate 
eventlog registry entries:

# eventlogadm -o addsource Application MyApplication \
	%SystemRoot%/system32/MyApplication.dll

This will add the key
[HKLM/System/CurrentControlSet/services/Eventlog/Application/MyApplication]
and to that key add value "MyApplication/EventLogMessageFile" 
with a string of %SystemRoot%/system32/MyApplication.dll

If there happens to be a share called [C$] on your samba server, 
and in that share there's a Windows/system32/MyApplication.dll 
file, it will be read by the eventlog viewer application when 
displaying eventlog records to pretty-print your eventlog entries.