.\" Written by David Fort (contact@hardening-consulting.com)
.\" Process this file with
.\" groff -man -Tascii wlog.7
.\"
.TH wLog 7 "June 2016" Version "2.0"
.SH NAME
wLog \- WinPR logging facility

.SH DESCRIPTION
wLog is a configurable and flexible logging system used throughout WinPR and
FreeRDP.

The primary concept is to have a hierarchy of loggers that can be be configured
independently.

.SH Appenders

WLog uses different appenders that define where the log output should be written
to. If the application doesn't explicitly configure the appenders the below
described variable WLOG_APPENDER can be used to choose one appender.

The following kind of appenders are available:

.IP Binary
Write the log data into a binary format file.

.IP Console
The console appender writes to the console. Depending of the operating system
the application runs on, the output might be handled differently. For example
on android log print would be used.

.IP File
The file appender writes the textual output to a file.

.IP Udp
This appender sends the logging messages to a pre-defined remote host via UDP.

If no target is set the default one 127.0.0.1:20000 is used. To receive the
log messages one can use netcat. To receive the default target the following
command can be used:
nc -u 127.0.0.1 -p 20000 -l
.IP Syslog
Use syslog for outputting the debug messages.
.IP Journald
This appender outputs messages to journald.

.SH Levels
The WLog are complementary, the higher level always includes the lower ones.
The level list below is top down. Top the highest level.

.IP TRACE
print everything including packets dumps
.IP DEBUG
debug messages
.IP INFO
general information
.IP WARN
warnings
.IP ERROR
errors
.IP FATAL
fatal problems
.IP OFF
completely disable the wlog output

.SH Formats
The format a logger prints has the following possible options:

.IP lv
log level
.IP mn
module name
.IP fl
file name
.IP fn
function
.IP ln
line number
.IP pid
process id
.IP tid
thread id
.IP yr
year
.IP mo
month
.IP dw
day of week
.IP hr
hour
.IP mi
minute
.IP se
second
.IP ml
millisecond
.PP
A maximum of 16 options can be used per format string.

An example that generally sets the WLOG_PREFIX for xfreerdp would look like:
WLOG_PREFIX="pid=%pid:tid=%tid:fn=%fn -" xfreerdp /v:xxx


.SH ENVIRONMENT
.IP WLOG_APPENDER
The kind of appender, the accepted values are: CONSOLE, FILE, BINARY, SYSLOG, JOURNALD or UDP

.IP WLOG_PREFIX
configure the prefix used for outputting the message (see Format for more details and examples)

.IP WLOG_LEVEL
the level to output messages for

.IP WLOG_FILTER
sets a filter for WLog messages. Only the filtered messages are
printed. The format of the filter is a series of \<logger name\>:\<level\> separated by
comas

example: WLOG_FILTER=core.channel:DEBUG,dummy:TRACE
will display debug messages for the core.channel logger and trace level for the dummy logger

.IP WLOG_FILEAPPENDER_OUTPUT_FILE_PATH
When using the file appender it may contains the output log file's path

.IP WLOG_FILEAPPENDER_OUTPUT_FILE_NAME
When using the file appender it may contains the output log file's name

.IP WLOG_JOURNALD_ID
When using the systemd journal appender, this variable contains the id used with
the journal (by default the executable's name)

.IP WLOG_UDP_TARGET
target to use for the UDP appender in the format
.B host:port

.SH BUGS
Please report any bugs using the bug reporting form on the
.B FreeRDP
web site

.SH "SEE ALSO"
Additional information and the latest version is available
at the web site:
.B http://www.freerdp.com

.SH AUTHOR
David Fort <contact@hardening-consulting.com> wrote this manpage from materials written
by Bernhard Miklautz <bernhard.miklautz@thincast.com>.