[gnutls-help] failing DTLS handshake

[Nikos Mavrogiannopoulos]

On Fri, Sep 1, 2017 at 9:49 AM, Balázs Kéri <1.int32 at gmail.com> wrote:
> Hi,
>
> I do not know if this is right place to ask about source code but I found
> something that may cause this problem:
>
> This message is printed to the log:
> 531 [2017-Aug-24 10:13:38.768832] [7f9cf8ff9700] [ML_LoadB23] [trace] GnuTLS
> -- [level:3]: ASSERT: buffers.c[parse_handshake_header]:961
> 532 [2017-Aug-24 10:13:38.768852] [7f9cf8ff9700] [ML_LoadB23] [trace] GnuTLS
> -- [level:3]: ASSERT: buffers.c[_gnutls_parse_record_buffered_msgs]:1292
> 533 [2017-Aug-24 10:13:38.768873] [7f9cf8ff9700] [ML_LoadB23] [trace] GnuTLS
> -- [level:1]: Invalid handshake packet headers. Discarding.
>
> The check at buffers.c:956 fails (condition becomes true) if the
> hsk->start_offset == hsk->end_offset which is the case here (fragment length
> is 1).

Hi,
 If fragment length is 1, shouldn't start_offset be 0 and end_offset
be 1? Do you have some reproducer for that?

regards,
Nikos