# &adminguide;

## Overview

This module provides the possibility to print user formatted log or debug messages from &kamailio; scripts, similar to the printf function. A C-style printf specifier is replaced with a part of the &sip; request or other variables from system.

## Implemented Specifiers

In the xlog function, you use pseudo-variables, that are a part of &kamailio; core and are used by other modules as well (e.g., avpops in the function `avp_printf()`)

The most important changes from earlier versions of &kamailio; are:

- - '%' has been replaced by '$'

- - to print a header, use $hdr(header_name[index]) instead of %{header_name[index]}

- - to print an AVP, use now $avp([si]:avp_id[index]) instead of %{[si]:avp_id[index]} or $avp([$avp_alias[index]) instead of %{[$avp_alias[index]}

The full list of available pseudo-variables in &kamailio; is available at: &kamwikilink;

## Dependencies

### &kamailio; Modules

The following modules must be loaded before this module:

- No dependencies on other &kamailio; modules. Note that many modules publish pseudovariables that you can use in this module. The core module for this is the pv module.

### External Libraries or Applications

The following libraries or applications must be installed before running &kamailio; with this module loaded:

- None.

## Parameters

### `buf_size` (integer)

Maximum size of the log message.

Default value is 4096.

#### Set `buf_size` parameter

    ...
    modparam("xlog", "buf_size", 8192)
    ...

### `force_color` (integer)

When set to 1, forces color codes in log messages even if `log_stderror` is set to 0.

Default value is 0.

#### Set `force_color` parameter

    ...
    modparam("xlog", "force_color", 0)
    ...

### `long_format` (integer)

When set to 1, outputs the configuration file name in xlogl() and xdbgl() before the line number.

Default value is 0.

#### Set `long_format` parameter

    ...
    modparam("xlog", "long_format", 1)
    ...

### `prefix` (str)

Prefix to be output before the log message.

Default value is "<script>: ".

#### Set `prefix` parameter

    ...
    modparam("xlog", "prefix", "-xlog: ")
    ...

### `prefix_mode` (str)

control behaviour of `prefix` value. if mode = 0 then `prefix` is treated as string (current behaviour). if mode = 1 then `prefix` is treated as pv_format specifier and value will be evaluated before output.

Default value is 0.

#### Set `prefix_mode` parameter

    ...
    modparam("xlog", "prefix", "$cfg(name):$cfg(line)")
    modparam("xlog", "prefix_mode", 1)
    ...

### `log_facility` (string)

Syslog facility to be used for the xlog output. By setting this, and configuring syslog, you can get the xlog messages in a separate syslog file than the debug messages issued from the source code.

Default value is NULL (unset - use same facility as source code debug messages).

#### log_facility example

    modparam("xlog", "log_facility", "LOG_DAEMON")

### `log_colors` (string)

Update terminal colors used by the &kamailio; core for log levels (when log_stderr=1 and log_color=1). The value has to be 'logname=colors', where colors is two characters specifying foreground and background in the same format as $C(xy) variable.

The parameter can be set many times. The value can also be a ';'-separated list of color specifications.

Default value is NULL.

#### log_colors example

    modparam("xlog", "log_colors", "L_ERR=cr")
    modparam("xlog", "log_colors", "L_ERR=cr;L_WARN=px")

### `methods_filter` (int)

The bitmask with internal SIP method ids to be ignored by xlogm() function. The value can be changed at runtime via cfg reload framework:

    ...
    kamcmd cfg.set_now_int xlog methods_filter 15
    ...

To see the associated internal ids for SIP requests, look in source tree inside parser/msg_parser.h for enum request_method.

Default value is -1 (all SIP methods are ignored).

#### Set `methods_filter` parameter

    ...
    modparam("xlog", "methods_filter", 15)
    ...

## Functions

### `xlog([ [facility,] level,] format)`

Output a formatted log message.

Meaning of the parameters are as follows:

- facility - The syslog facility that will be used for this single log message.

  If this parameter is missing, the implicit facility is either the facility set with the 'log_facility' module parameter or the core's log facility.

- level - The level that will be used in LOG function. It can be:

  - L_ALERT - log level -5

  - L_BUG - log level -4

  - L_CRIT - log level -3

  - L_ERR - log level -1

  - L_WARN - log level 0

  - L_NOTICE - log level 1

  - L_INFO - log level 2

  - L_DBG - log level 3

  - $pv - any valid pseudo-variable, that has an integer value. See above options for valid log levels.

  If it is not a pseudo-variable, then what really matters is the third letter of the value. If the log level is higher than the debug global parameter, the message is not printed to syslog.

  If this parameter is missing, the implicit log level is 'L_ERR'.

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xlog` usage

    ...
    xlog("L_ERR", "time [$Tf] method ($rm) r-uri ($ru) 2nd via ($hdr(via[1]))\n");
    ...
    xlog("time [$Tf] method ($rm) r-uri ($ru) 2nd via ($hdr(via[1]))\n");
    ...
    $var(loglevel) = 2;
    xlog("$var(loglevel)", "time [$Tf] method ($rm) r-uri ($ru)\n");
    ...
    xlog("LOG_LOCAL3", "L_ERR", "this message will be sent to syslog facility LOG_LOCAL3\n");
    ...

### `xdbg(format)`

Print a formatted message using DBG function.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xdbg` usage

    ...
    xdbg("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xinfo(format)`

Print a formatted log message at L_INFO level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xinfo` usage

    ...
    xinfo("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xnotice(format)`

Print a formatted log message at L_NOTICE level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xnotice` usage

    ...
    xnotice("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xwarn(format)`

Print a formatted log message at L_WARN level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xwarn` usage

    ...
    xwarn("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xerr(format)`

Print a formatted log message at L_ERR level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xerr` usage

    ...
    xerr("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xbug(format)`

Print a formatted log message at L_BUG level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xbug` usage

    ...
    xbug("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xcrit(format)`

Print a formatted log message at L_CRIT level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xcrit` usage

    ...
    xcrit("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xalert(format)`

Print a formatted log message at L_ALERT level.

Meaning of the parameters is as follows:

- format - The formatted string to be printed.

This function can be used from ANY_ROUTE.

#### `xalert` usage

    ...
    xalert("time $Cbx[$Tf]$Cxx method ($rm) r-uri ($ru)\n");
    ...

### `xlogl([ [facility,] level,] format)`

Similar to xlog(), in addition prints configuration file line number at the beginning of message.

### `xdbgl(format)`

Similar to xdbg(), in addition prints configuration file line number at the beginning of message.

### `xlogm(level, format)`

Similar to xlog(level, format), but skips writing the log messages for SIP requests and responses that match the SIP method id with methods_filter parameter value.