[openssl-users] Query regarding the SCTP events for DTLS connections

[Michael Tuexen]

> On 28. Sep 2017, at 20:36, mahesh gs <mahesh116 at gmail.com> wrote:
> 
> Hi,
> 
> We have an application which has SCTP connections we have secured the SCTP connections using the openssl DTLS. DTLS is working as expected other than the SCTP events.
> 
> We use the API "BIO_new_dgram_sctp" to create a BIO objects and we register a callback function to openssl using API "BIO_dgram_sctp_notification_cb" to populate the SCTP events. I observe that openssl enables only authentication related events, do not enable any other events like association, shutdown etc.
> 
> Code snippet from the API "BIO_new_dgram_sctp":
> 
>     event.sctp_authentication_event = 1;
> 
>     ret =
>         setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event,
>                    sizeof(struct sctp_event_subscribe));
>     if (ret < 0) {
>         BIO_vfree(bio);
>         return (NULL);
>     }
> 
> Is there any specific reason for just enabling the authentication events ?
The authentication events are needed by the DTLS implementation and are therefore
enabled by it. Other events have to be subscribed by the application. See
https://github.com/nplab/DTLS-Examples/blob/master/src/dtls_sctp_echo.c
for an example.

Best regards
Michael
> 
> If yes, is there any way applications register for other events like shutdown, association etc. We have a requirement where based on the SCTP events application executes certain business logic.
> 
> Thanks,
> Mahesh G S
> -- 
> openssl-users mailing list
> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users