res_fastcgi

FastCGI event provider for Asterisk

A small module which provides AMI messages directly to FastCGI server, such as PHP-FPM. It can be useful to process events in a custom way

Comparbility

Tested on Asterisk 13.13, 16.4 and 18.4

Compilation

Usual boring sequence:

./configure && make && make install

Data transfer

Module sends data to script through environment variables, and doesn`t care what data receives back.

Here is an example data of single script shot:

$_SERVER = Array (
    'USER' => 'asterisk',
    'HOME' => '/var/lib/asterisk',
    'RemoteAddress' => 'IPV4/UDP/1.2.3.4/60243',
    'LocalAddress' => 'IPV4/UDP/5.6.7.8/5060',
    'SessionID' => '485334176-1794503427-955328712',
    'AccountID' => 1234,
    'EventVersion' => 1,
    'Service' => 'PJSIP',
    'Severity' => 'Error',
    'EventTV' => '2020-01-01T01:02:04.735+0000',
    'Privilege' => 'security,all',
    'Event' => 'InvalidAccountID',
    'REQUEST_METHOD' => 'GET',
    'SCRIPT_FILENAME' => '/var/lib/asterisk/manager.php',
    'FCGI_ROLE' => 'RESPONDER',
    'PHP_SELF' => '',
    'REQUEST_TIME_FLOAT' => 1600001234.7358,
    'REQUEST_TIME' => 1600001234
);

Sample configuration with PHP-FPM

Make sure your listening socket is writeable by Asterisk's running user. The good idea is to create a separate pool of PHP-FPM processes by creating a file (e.g. ast.conf) in you fpm pool config directory (e.g. /etc/php/7.0/fpm/pool.d/)

[ast]
user = nobody
group = nogroup
listen = /var/run/asterisk/php-fpm.sock
listen.owner = asterisk
listen.group = asterisk
pm = static
pm.max_children = 2

Then restart a service - systemctl restart php-fpm

Now configure module definitions in /etc/asterisk/res_fastcgi.conf

[global]
socket = /var/run/asterisk/php-fpm.sock
script = /var/lib/asterisk/manager.php

Options are:

• socket - UNIX domain socket path of FastCGI server, default is /var/run/asterisk/php-fpm.sock
• script - Script name for FastCGI processor, default is /var/lib/asterisk/manager.php

Now we add some buisness-logic to a processing script (make sure it is readable by pool running user!)

<?php

if ( ! in_array( $_SERVER['Event'], [ 'ChallengeSent', 'SuccessfulAuth', 'RTCPSent', 'RTCPReceived' ] ) ) {
	file_put_contents( '/tmp/debug.out', print_r( $_SERVER, 1 ), FILE_APPEND );
}

And finally load module via asterisk console - asterisk -x "module load res_fastcgi"

Now we can see file /tmp/debug.out populating by AMI events