lua Module

The time needed when writing a new OpenSIPS module unfortunately is quite high, while the options provided by the configuration file are limited to the features implemented in the modules.

With this Lua module, you can easily implement your own OpenSIPS extensions in Lua.

1.2. Installing the module

This Lua module is loaded in opensips.cfg (just like all the other modules) with loadmodule("/path/to/lua.so");.

For the Lua module to compile, you need a recent version of Lua (tested with 5.1) linked dynamically. The default version of your favorite Linux distribution should work fine.

1.3. Using the module

With the Lua module, you can access to lua function on the OpenSIPS side. You need to define a file to load and call a function from it. Write a function "mongo_alias" and then write in your opensips.cfg

...
if (lua_exec("mongo_alias")) {
	...
}
...

On the Lua side, you have access to opensips functions and variables (AVP, pseudoVar, ...). Read the documentation below for further informations.

1.4. Dependencies

1.4.1. OpenSIPS Modules

None ;-)

1.4.2. External Libraries or Applications

The following libraries or applications must be installed before running OpenSIPS with this module loaded:

Lua 5.1.x or later
memcached

This module has been developed and tested with Lua 5.1.?, but should work with any 5.1.x release. Earlier versions do not work.

On current Debian systems, at least the following packages should be installed:

lua5.1
liblua5.1-0-dev
libmemcached-dev
libmysqlclient-dev

It was reported that other Debian-style distributions (such as Ubuntu) need the same packages.

On OpenBSD systems, at least the following packages should be installed:

1.5. Exported Parameters

1.5.1. luafilename (string)

This is the file name of your script. This may be set once only, but it may include an arbitary number of functions and "use" as many Lua module as necessary.

The default value is "/etc/opensips/opensips.lua"

Example 1.1. Set luafilename parameter

...
modparam("lua", "luafilename", "/etc/opensips/opensips.lua")
...

1.5.2. lua_auto_reload (int)

Define this value to 1 if you want to reload automatically the lua script. Disabled by default.

1.5.3. warn_missing_free_fixup (int)

When you call a function via moduleFunc() you could have a memleak. Enable this warns you when you're doing it. Enabled by default.

1.5.4. lua_allocator (string)

Change the default memory allocator for the lua module. Possible values are :

opensips (default)
malloc

1.6. Exported Functions

1.6.1. lua_exec(func, [param])

Calls a Lua function with passing it the current SIP message. This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, ONREPLY_ROUTE and BRANCH_ROUTE.

Parameters:

func (string) - Lua function name
param (string, optional) - Parameter to be passed to the Lua function.

Example 1.2. lua_exec() usage

...
if (lua_exec("mongo_alias")) {
	...
}
...

1.6.2. lua_meminfo()

Logs informations about memory.

1.7. Exported MI Functions

1.7.1. `watch`

Name: watch

Parameters: none

action (optional) - 'add' or 'delete'
extension (optional) - required if action is provided

MI FIFO Command Format:

  opensips-cli -x mi watch

Chapter 2. OpenSIPS Lua API

2.1. Available functions

This module provides access to a limited number of OpenSIPS core functions.

2.1.1. xdbg(message)

An alias for xlog(DBG, message)

2.1.2. xlog([level],message)

Logs the message with OpenSIPS's logging facility. The logging level is one of the following:

ALERT
CRIT
ERR
WARN
NOTICE
INFO
DBG

2.1.3. WarnMissingFreeFixup

Dynamically change the variable warn_missing_free_fixup.

2.1.4. getpid

Returns the current pid.

2.1.5. getmem

Returns a table with the size of allocated memory and the fragmentation.

2.1.6. getmeminfo

Returns a table with memory infos.

2.1.7. gethostname

Returns the value of the current hostname.

2.1.8. getType(msg)

Returns "SIP_REQUEST" or "SIP_REPLY".

2.1.9. isMyself(host, port)

Test if the host and optionally the port represent one of the addresses that OpenSIPS listens on.

2.1.10. grepSockInfo(host, port)

Similar to isMyself(), but without taking a look into the aliases.

2.1.11. getURI_User(msg)

Returns the user of the To URI.

2.1.12. getExpires(msg)

Returns the expires header of the current message.

2.1.13. getHeader(msg, header)

Returns the value of the specified header.

2.1.14. getContact(msg)

Returns a table with the contact header.

2.1.15. getRoute(msg)

Returns a table with the Route header.

2.1.16. moduleFunc(msg, function, args1, args2, ...)

You can pass arguments to this function.

2.1.17. getStatus(msg)

Returns the current status if the SIP message is a SIP_REPLY.

2.1.18. getMethod(msg)

Returns the current method.

2.1.19. getSrcIp(msg)

Returns the IP address of the source.

2.1.20. getDstIp(msg)

Returns the IP address of the destination.

2.1.21. AVP_get(name)

Returns an AVP variable.

2.1.22. AVP_set(name, value)

Defines an AVP variable.

2.1.23. AVP_destroy(name)

Destroys an AVP variable.

2.1.24. pseudoVar(msg, variable)

Returns a pseudoVar.

2.1.25. pseudoVarSet(msg, variable, value)

Sets the value of a pseudoVar.

2.1.26. scriptVarGet(variable)

Returns a script variable.

2.1.27. scriptVarSet(variable, value)

Sets the value of a script variable.

2.1.28. add_lump_rpl(msg, header)

Add header to the reply.

Chapter 3. Contributors

3.1. By Commit Statistics

Table 3.1. Top contributors by DevScore⁽¹⁾, authored commits⁽²⁾ and lines added/removed⁽³⁾

	Name	DevScore	Commits	Lines ++	Lines --
1.	Arnaud Chong + Eric Gouyer	37	1	4335	0
2.	Razvan Crainea (@razvancrainea)	32	25	263	219
3.	Vlad Patrascu (@rvlad-patrascu)	24	16	320	274
4.	Liviu Chircu (@liviuchircu)	13	10	15	63
5.	Bogdan-Andrei Iancu (@bogdan-iancu)	8	6	9	3
6.	Vlad Paiu (@vladpaiu)	5	3	7	9
7.	Maksym Sobolyev (@sobomax)	3	1	6	3
8.	Julián Moreno Patiño	3	1	1	1
9.	Peter Lemenkov (@lemenkov)	3	1	1	1

(1) DevScore = author_commits + author_lines_added / (project_lines_added / project_commits) + author_lines_deleted / (project_lines_deleted / project_commits)

(2) including any documentation-related commits, excluding merge commits. Regarding imported patches/code, we do our best to count the work on behalf of the proper owner, as per the "fix_authors" and "mod_renames" arrays in opensips/doc/build-contrib.sh. If you identify any patches/commits which do not get properly attributed to you, please submit a pull request which extends "fix_authors" and/or "mod_renames".

(3) ignoring whitespace edits, renamed files and auto-generated files

3.2. By Commit Activity

Table 3.2. Most recently active contributors⁽¹⁾ to this module

	Name	Commit Activity
1.	Vlad Patrascu (@rvlad-patrascu)	May 2017 - Jun 2023
2.	Maksym Sobolyev (@sobomax)	Feb 2023 - Feb 2023
3.	Razvan Crainea (@razvancrainea)	Feb 2012 - Feb 2023
4.	Bogdan-Andrei Iancu (@bogdan-iancu)	May 2014 - Jan 2020
5.	Liviu Chircu (@liviuchircu)	Mar 2014 - Mar 2019
6.	Peter Lemenkov (@lemenkov)	Jun 2018 - Jun 2018
7.	Julián Moreno Patiño	Feb 2016 - Feb 2016
8.	Vlad Paiu (@vladpaiu)	Feb 2012 - Jun 2012
9.	Arnaud Chong + Eric Gouyer	Dec 2011 - Dec 2011

(1) including any documentation-related commits, excluding merge commits

Chapter 4. Documentation

4.1. Contributors

Last edited by: Vlad Patrascu (@rvlad-patrascu), Razvan Crainea (@razvancrainea), Peter Lemenkov (@lemenkov), Liviu Chircu (@liviuchircu), Vlad Paiu (@vladpaiu), Arnaud Chong + Eric Gouyer.