[riot-notifications] [RIOT-OS/RIOT] Kconfig/tinydtls: Unable to compile `examples/dtls-sock` with `CONFIG_DTLS_ECC` enabled (#16873)

Martine Lenders notifications at github.com
Tue Sep 21 10:22:16 CEST 2021

please submit it to the security mailing-list security at riot-os.org.

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#### Description
When trying to build `examples/dtls-sock` with the ECC cyphersuit, the build fails. I am not sure if this is a `tinydtls` (configuration) problem or a `Kconfig` problem.
Example: Cannot build gnrc_networking application for samr21-xpro board.

#### Steps to reproduce the issue
Add the following `app.config` to the `examples/dtls-sock` directory:


and try to build

make -C examples/dtls-sock/ flash -j

Try to describe as precisely as possible here the steps required to reproduce
the issue. Here you can also describe your hardware configuration, the network
setup, etc.

#### Expected results
The application should build.
Example: The gnrc_networking application builds on samr21-xpro.

#### Actual results
The build fails due to the `IS_ACTIVE(CONFIG_DTLS_PSK)` branch in `dtls-client.c` being taken at one point:

examples/dtls-sock/dtls-client.c: In function ‘client_send’:
examples/dtls-sock/dtls-client.c:169:24: error: ‘credential1’ undeclared (first use in this function); did you mean ‘credential0’?
  169 |     res = credman_add(&credential1);
      |                        ^~~~~~~~~~~
      |                        credential0
dtls-sock/dtls-client.c:169:24: note: each undeclared identifier is reported only once for each function it appears in
dtls-sock/dtls-client.c:183:45: error: ‘_client_psk_cb’ undeclared (first use in this function)
  183 |     sock_dtls_set_client_psk_cb(&dtls_sock, _client_psk_cb);
      |                                             ^~~~~~~~~~~~~~

Please paste or specifically describe the actual output.

#### Versions
Current master (99e614b6d2d4155a736b744). I tested this on `native`. Compilation and functionality worked in 57533a76fdab9a948b528b549fff, where the app was first introduced, but `tinydtls` did not use Kconfig at that point. Did not bisect further.
Operating system: Mac OSX, Linux, Vagrant VM
Build environment: GCC, CLang versions (you can run the following command from
the RIOT base directory: make print-versions).

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