Bug: MM4 flooding with MM4_forward.RES

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Author Message
Dziugas Baltrunas
New member
Username: Menulis

Post Number: 5
Registered: 02-2006
Posted on Friday, April 07, 2006 - 06:18 am:   

Hi,

we're using NowSMS v5.51k as a MMSC. We noticed the following serious misbehaviour. If incoming message is coming via MM4 and routing callback returns Route=BlockMessage, then MM4_forward.RES is sent back to the foreign MMSC over MM4 with the following format:

Wed Apr 5 08:01:15 EEST 2006
Received: from mmsc (unknown [x.x.x.x])
by x.y.tld (Mailer) with SMTP id DAB77A2181
for <system-user@xxx>; Wed, 5 Apr 2006 08:01:14 +0300 (EEST)
X-Mms-3GPP-MMS-Version: 5.3.0
X-Mms-Message-Type: MM4_forward.RES
Date: Wed, 5 Apr 2006 07:59:18 +0300
To: system-user@xxx
Sender: system-user@yyy
From: system-user@yyy
X-Mms-Message-ID: "RDIEeAooawEAACy-AAAATAABvq0AAAAA"
X-Mms-Transaction-ID: "RDIEeAooawEAACy-AAAATAABvq0AAAAA"
X-Mms-Request-Status-Code: error-unspecified
X-Mms-Status-Text: Unknown error occurred processing message
Subject: MM4 Acknowledgement
Message-ID: ED92946C@mmsc

The message body is empty. However, after MM4_forward.RES is sent, original MMS stays in MMSCIN forever, so same MM4_forward.RES messages are repeated every scan of the MMSCIN, i.e. every second or so.

I only came with ugly workaround to always return Route=Direct if the message is coming over MM4.

In each of the .RFC file in MMSCIN folder where it stays forever the leading line is as folllows:

X-MMSC-RCPT-TO: +xxxyyy/TYPE=DENY
X-MMSC-Auth-User: VASP:x.x.x.x

Just to note that this is not the case for MMS coming over MM1, where response "Unsupported recipient" is sent back for user in m-send-conf and MMS is removed from MMSCIN folder.

Thanks,
Dziugas
Bryce Norwood - NowSMS Support
Board Administrator
Username: Bryce

Post Number: 5796
Registered: 10-2002
Posted on Tuesday, April 18, 2006 - 08:36 pm:   

Hi Dziugas,

In this particular circumstance, we are expecting the recipient to be blocked by an accounting pre-auth call, rather than the routing callback.

The accouting pre-auth returning a deny response would block the message from entering the system at the MM4/SMTP envelope layer.

Of course, what you are doing should work, and I agree that this needs to be fixed.

We just did not anticipate this situation where the accounting callback is ok, but the routing callback indicates block.

There is a patch scheduled for NowSMS 2006 early next week, which will include a fix for this problem.

I'm going to see if we can also go back and apply the fix for a v5.51 patch.

-bn
Bryce Norwood - NowSMS Support
Board Administrator
Username: Bryce

Post Number: 5851
Registered: 10-2002
Posted on Thursday, April 27, 2006 - 05:48 pm:   

Update for NowSMS 2006 to correct this behavior at:

http://support.nowsms.com/discus/messages/53/15129.html

Still investigating to see if a v5.51 patch can be produced.

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