[riot-notifications] [RIOT-OS/RIOT] pkg/tinydtls: set address family of session endpoint on sock_dtls_recv (#15416)

János Brodbeck notifications at github.com
Tue Nov 10 03:09:02 CET 2020


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### Contribution description
On a `SOCK_ASNYC_MSG_RECV` event the received session (received via `sock_dtls_recv`) has no set address family for the endpoint. This fixes the bug by setting the address family when the endpoint is created out of the session in tinydtls.
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### Testing procedure
[This](https://github.com/RIOT-OS/RIOT/tree/master/tests/pkg_tinydtls_sock_async) test can be used as application together with this patch:
```
diff --git a/tests/pkg_tinydtls_sock_async/dtls-client.c b/tests/pkg_tinydtls_sock_async/dtls-client.c
index 2cafecc18..f3c833c90 100644
--- a/tests/pkg_tinydtls_sock_async/dtls-client.c
+++ b/tests/pkg_tinydtls_sock_async/dtls-client.c
@@ -147,6 +147,15 @@ static void _dtls_handler(sock_dtls_t *sock, sock_async_flags_t type, void *arg)
             printf("Received %d bytes: \"%.*s\"\n", (int)res, (int)res,
                    (char *)_recv_buf);
         }
+        printf("Session.ep.family: ");
+        switch (session.ep.family) {
+            case (AF_INET6):
+                printf("AF_INET6\n");
+                break;
+            case (AF_UNSPEC):
+                printf("AF_UNSPEC\n");
+                break;
+        }
         puts("Terminating session");
         sock_dtls_session_destroy(sock, &session);
         _close_sock(sock);
```
- Create two tap interfaces (e.g. with [tapsetup](https://github.com/RIOT-OS/RIOT/tree/master/dist/tools/tapsetup)) and run the application on both interfaces
- Start DTLS server on one of the instances: `dtlss start`
- Send DTLS message from the other instance: `dtlsc {addr} {data}`

Without the patch `Session.ep.family: AF_UNSPEC` should be printed since no address family is set after receiving
With patch the result should be `Session.ep.family: AF_INET6`  

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### Issues/PRs references

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15416

-- Commit Summary --

  * pkg/tinydtls: set endpoint family on sock_dtls_recv

-- File Changes --

    M pkg/tinydtls/contrib/sock_dtls.c (1)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15416.patch
https://github.com/RIOT-OS/RIOT/pull/15416.diff

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