Martin Lucina wrotw:
>
> I'm experiencing a problem with Kannel, both with version 1.3.1
> and reproducible elsewhere with the current CVS): In a multi-operator
> setup I have some SMSC connections which are polled over a dialup link.
> There is a script that connects the PPP link periodically, sends a
> start-smsc command to Kannel for SMSCs behind that link, polls for
> messages for some time, downs the link and sends stop-smsc to Kannel.
>
> If our application attempts to send an SMS via Kannel to one of the
> SMSCs when they are down (Kannel status records them as 'dead') then the
> following gets logged (CVS version example):
>
> 2004-05-24 12:57:44 [7] WARNING: Message rejected by bearerbox, no router!
> 2004-05-24 12:58:40 [7] WARNING: Cannot find SMSCConn for message to <....>,
> rejected.
>
> The message also (in 1.3.1, not in CVS) gets logged as DISCARDED in the
> access log. However -- and this is the problem -- the application never
> gets back a FAILED DLR for the message, hence cannot tell whether it
> should re-send it or not.
>
> I've spent some time looking through the code paths in an attempt to
> figure out what is going on -- comparing sms_router () to
> deliver_sms_to_queue () suggests that the following patch should fix the
> behaviour to be consistent:
>
> --- bb_boxc.c 16 Feb 2004 19:41:26 -0000 1.77
> +++ bb_boxc.c 24 May 2004 14:05:22 -0000
> @@ -223,21 +223,10 @@
> mack->ack.nack = ack_buffered;
> break;
> case -1: /* no router at all */
> - warning(0, "Message rejected by bearerbox, no router!");
> - /*
> - * first create nack for store-file, in order to delete
> - * message from store-file.
> - */
> - mack_store = msg_create(ack);
> - gw_assert(mack_store != NULL);
> - uuid_copy(mack_store->ack.id, msg->sms.id);
> - mack_store->ack.time = msg->sms.time;
> - mack->ack.nack = mack_store->ack.nack = ack_failed;
> - store_save(mack_store);
> - msg_destroy(mack_store);
> -
> - /* destroy original message */
> - msg_destroy(msg);
> + mack->ack.nack = ack_failed;
> + warning(0, "No SMSCes to receive message, discarding it!");
> + bb_smscconn_send_failed(NULL, msg, SMSCCONN_FAILED_DISCARDED,
> + octstr_create("DISCARDED"));
> break;
> }
>
> I've tested it here and it has the desired effect (a NACK/DISCARDED DLR
> gets sent back to the application).
-1 on the patch, first of all.
The problem can be described as follows:
your client sends a msg which (in case the smsc link is in dead state)
can not be transported. Kannel treads this msg as "untransportable"
and hence the mack->ack.nack = ack_failed _is_ send to your client
application (smsbox in the usualy case).
Your argumentation that there is no FAIL DLR that gets back
transported to the the application layer may be reasonable. Kannel
descides if a FAIL DLR is created, after it had _tried_ to deliver the
msg to a routed smsc link. Which is not the case here. Hence Kannel
does never try to transport the msg to an smsc and hence does not
create a DLR for it.
This is more a semantical problem here. We "may" descide to threat
such "unroutable" messages with failing DLRs. Any opionions from the
others if this is reasonable?!
BTW, why isn't it an option to let the smsc links online and let them
try to reconnect on their own while you drop of the tcp layer from it?
This would cause Kannel to hold up the msgs in the internal quques and
dispose them when the link is established again. Where the DLRs will
get transported then too.
Stipe
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