[Asterisk-Users] DISA and AGI: authenticate by caller ID? (resolved)

[Matthew Simpson]

Here is some code to do authentication by caller ID for DISA through AGI.
My original code had a bug in the Mysql query code, and there was a hangup
in the wrong place
[that's what I get for coding something at 2:00am], but the attached code
works correctly.

Take note of the REGEXP for the CallerID variable.  When I tested the code
from the PSTN
it worked because there was no name component, but it broke from SIP.  If
you're calling SIP-->SIP you'll have the name in
that variable as well as the number, so I added code to snip everything but
the 10 digits.  Adjust accordingly if you have more or less
than 10 digits.  Also, I've thought of a bug already, if your caller ID name
has digits in it, it'll break the regexp.  Adjust accordingly
if that is true about your installation.

Yours,
Matthew Simpson
TxLink Communications
IAX/SIP Termination and Origination
Wholesale Dialup Services
matthew at txlink.net
972-617-2877
http://www.txlink.net

You'll need a context called ldincoming [or equivalent] for the AGI to
transfer access to DISA like:

[ldincoming]
exten => 1011,1,DISA(no-password|disa)
exten => 1011,2,Hangup

You'll need a context called disa [or equivalent] with what you want to
allow the authenticated callers to access, mine looks like:

[disa]
include => tollfree
include => localonly

and then just call the agi in your dialplan with something like:

1234,1,AGI(cidauth.agi)
1234,2,Hangup

Here is the Mysql table:

mysql> describe cids;
+--------+----------+------+-----+---------+----------------+
| Field  | Type     | Null | Key | Default | Extra          |
+--------+----------+------+-----+---------+----------------+
| id     | int(11)  |      | PRI | NULL    | auto_increment |
| cid    | char(10) | YES  |     | NULL    |                |
| active | int(11)  | YES  |     | NULL    |                |
+--------+----------+------+-----+---------+----------------+

Insert each CID into the table that you want to have access.  Active = 0 for
disabled, active = 1 for enabled.

Here is the perl code:

#!/usr/bin/perl
#

use Asterisk::AGI;
use DBI;

$db = "dbname";
$host = "dbhost";
$port = "3306";
$userid = "dbuser";
$password = "dbpass";
$connectionInfo = "DBI:mysql:database=$db;$host:$port";
$dbh = DBI->connect($connectionInfo,$userid,$password);

$AGI = new Asterisk::AGI;

my %input = $AGI->ReadParse();

$AGI->answer();

if (my $callerid = $input{'callerid'}) {

        $callerid =~ m/(\d{10})/;                       # cut off the name
part of CID, numbers only
        $callerid = $1;
        $query = "SELECT active FROM cids WHERE cid='$callerid'";
        $sth = $dbh->prepare($query);
        $sth->execute();
        $active = $sth->fetchrow_hashref();

         if ($active->{"active"})
        {
                $AGI->set_context('ldincoming');
                $AGI->set_extension('1011');
                $AGI->set_priority(1);
                exit;
        }
}

# if we got here, there was no match found [auth failed], so play a message
saying so
# you could also log all auth failed [with caller ID ! :) ]
# you could also transfer caller to an operator

$AGI->stream_file('invalid');
$AGI->hangup();

exit;