[OpenSIPS-Users] del_uri_param failure

[Bogdan-Andrei Iancu]

Hi Ben,

What OpensSIPS version and revision are you working with ?

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   http://www.opensips-solutions.com
OpenSIPS Summit 2018
   http://www.opensips.org/events/Summit-2018Amsterdam

On 02/22/2018 01:07 AM, Ben Newlin wrote:
>
> Hi,
>
> I am very glad to have the new del_uri_param function. This was a 
> common problem of mine and it is great not to have to use regex to do 
> this. However, while implementing this I have run into some strange 
> behavior by the function when the URI param being deleted does not exist.
>
> In my case I am using the dialog module and attempting to remove a URI 
> param just after the dialog creation. When the function does not find 
> the URI param, it causes the dialog to immediately be destroyed and 
> all message processing stops, including exiting the script.
>
> Feb 21 22:47:42 [371] DBG:uri:del_uri_param: requested key not found 
> in RURI
>
> Feb 21 22:47:42 [371] DBG:dialog:next_state_dlg: unref dlg 
> 0x7f460780a8c8 with 1 -> 2 in entry 0x7f46077fbfa8
>
> Feb 21 22:47:42 [371] DBG:core:evi_param_set: adding string param
>
> Feb 21 22:47:42 [371] DBG:core:evi_param_set: adding string param
>
> Feb 21 22:47:42 [371] DBG:core:evi_param_set: adding int param
>
> Feb 21 22:47:42 [371] DBG:core:evi_param_set: adding int param
>
> Feb 21 22:47:42 [371] DBG:core:destroy_avp_list: destroying list (nil)
>
> Feb 21 22:47:42 [371] DBG:dialog:next_state_dlg: dialog 0x7f460780a8c8 
> changed from state 1 to state 5, due event 1
>
> Feb 21 22:47:42 [371] DBG:dialog:dlg_onreply: dialog 0x7f460780a8c8 
> failed (negative reply)
>
> Feb 21 22:47:42 [371] DBG:dialog:unref_dlg: unref dlg 0x7f460780a8c8 
> with 1 -> 1 in entry 0x7f46077fbfa8
>
> Feb 21 22:47:42 [371] DBG:dialog:unref_dlg: unref dlg 0x7f460780a8c8 
> with 1 -> 0 in entry 0x7f46077fbfa8
>
> Feb 21 22:47:42 [371] DBG:dialog:unref_dlg: ref <=0 for dialog 
> 0x7f460780a8c8
>
> Feb 21 22:47:42 [371] DBG:dialog:destroy_dlg: destroying dialog 
> 0x7f460780a8c8
>
> Feb 21 22:47:42 [371] DBG:dialog:destroy_dlg: dlg expired or not in 
> list - dlg 0x7f460780a8c8 [3710:1818203549] with clid 
> '2-185 at 127.0.0.1' and tags '185SIPpTag002' 'NULL'
>
> Feb 21 22:47:42 [371] DBG:core:destroy_avp_list: destroying list 
> 0x7f460780c048
>
> Feb 21 22:47:42 [371] DBG:core:receive_msg: cleaning up
>
> The logs indicate that a DLG_EVENT_TDEL is being raised which, when 
> the dialog is still in UNCONFIRMED state, causes the dialog to be 
> destroyed. It’s not clear to me how or why the del_uri_param function 
> could be doing this, especially as a transaction hasn’t even been 
> created for the message yet in this case. I’m not sure what effect 
> this would have if the dialog is in other states or at other times 
> during the call.
>
> It took me a while to realize it was the del_uri_param function 
> causing this, as it seems so strange. But I have verified that when I 
> remove the function, or when I verify the URI param exists before 
> calling the function, everything is fine. That workaround works 
> perfectly well, but it seemed such strange and catastrophic error 
> behavior to drop the entire message that I wanted to report it anyway 
> to see if anything needed to be addressed.
>
> Call traces can be found here: https://pastebin.com/9FnmJCD9
>
> You will see the same INVITE is offered multiple times as OpenSIPS is 
> not responding after dropping the previous requests and dialog.
>
> Thanks,
>
> Ben Newlin
>
>
>
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