Vedant Roy

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6 years ago.

Why does ssl_server.c go to exit instead of reset if mbedtls_net_accept fails?

An example program using mbedTLS can be found in the official repository, here: https://github.com/ARMmbed/mbedtls/blob/development/programs/ssl/ssl_server.c

I am confused about why the program goes to "exit" instead of "reset" if `mbedtls_net_accept` fails.

Here are 2 snippets of the code. The first snippet is code from right after the reset goto point.

code around reset goto statement

reset:
#ifdef MBEDTLS_ERROR_C
    if( ret != 0 )
    {
        char error_buf[100];
        mbedtls_strerror( ret, error_buf, 100 );
        mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
    }
#endif

    mbedtls_net_free( &client_fd );

    mbedtls_ssl_session_reset( &ssl );

    /*
     * 3. Wait until a client connects
     */
    mbedtls_printf( "  . Waiting for a remote connection ..." );
    fflush( stdout );

    if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
                                    NULL, 0, NULL ) ) != 0 )
    {
        mbedtls_printf( " failed\n  ! mbedtls_net_accept returned %d\n\n", ret );
        goto exit;
    }

    mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );

    mbedtls_printf( " ok\n" );

    /*
     * 5. Handshake
     */
     //Code continues on...

The second snippet is the code right after the exit goto point.

code after exit goto point

exit:
    mbedtls_printf("Exiting...");

#ifdef MBEDTLS_ERROR_C
    if (ret != 0)
    {
        char error_buf[100];
        mbedtls_strerror(ret, error_buf, 100);
        mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);
    }
#endif

    mbedtls_net_free_ocall(&client_fd);
    mbedtls_net_free_ocall(&listen_fd);

    mbedtls_x509_crt_free(&srvcert);
    mbedtls_pk_free(&pkey);
    mbedtls_ssl_free(&ssl);
    mbedtls_ssl_config_free(&conf);

    mbedtls_ctr_drbg_free(&ctr_drbg);
    mbedtls_entropy_free(&entropy);

    return (ret);
}
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