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

Michael Tuexen Michael.Tuexen at lurchi.franken.de
Fri Sep 29 20:25:13 UTC 2017

> 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
for an example.

Best regards
> 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
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