To: GNU TLS Library Help Forum
Hello. I am new to the GNU TLS Library. I am writing a DTLS Server and
Client software package. My client and server software will only be
communicating with each other. I will not have to deal with a DTLS Server or
Client that I have not developed. The DTLS Server and Client will be in an
environment that communications between them will experience packets out of
order and loss. In this environment, using a TCP based protocol will be
problematic.
When I first started, I was under the assumption that the GNU DTLS Library
would handle packets being out of order or retransmit packets that were lost.
The main reason for this thought was that I my assumption that computing the
next Nonce would require the previous packet. But I am reading the source
code, it does not appear that the GNU TLS library does not handle out of order
packets or lost packets for the application data. It appears the Nonce is
based on just the sequence number in the DTLS application data header.
Before I start trying to deal with this issue, I would like to ask some
questions:
1) I am using the function gnutls_record_recv_seq to receive the DTLS
application data. I am can detect when packets are received out of order and
when a packet loss occurs. But I do not see in the interface away to use the
sequence number to request the packet to be retransmitted. Does the sequence
number only provide the ability to detect packets being out of order or packet
loss?
2) If the answer is yes to the question above, does that mean I will have
to write my own overhead to identify which packet was lost and mechanism to
request the server to retransmit the data that was loss at the application
layer?
3) Are there any examples of source code with a DTLS Server and Client
handling out of order packets and packet lost?
Any help or guidance would be appreciated.
Thank You,
Chuck Wanner
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