<div dir="ltr">Hi,<div><br></div><div>Thank you for sharing the sample code.</div><div><br></div><div>I tried running SCTP DTLS Echo server and client. I am facing strange problem "ssl_connect" hangs on the client side, even the "ssl_accept" hangs on the server side. </div><div><br></div><div>Client side back trace</div><div><br></div><div><div>(gdb) bt</div><div>#0 0x0000003db4c0ea10 in __recvmsg_nocancel () from /lib64/libpthread.so.0</div><div>#1 0x00007ffff7a64dc5 in dgram_sctp_read (b=0x6223f0, out=0x629073 "\026\376\377", outl=17741) at bss_dgram.c:1178</div><div>#2 0x00007ffff7a597a9 in BIO_read (b=0x6223f0, out=0x629073, outl=17741) at bio_lib.c:210</div><div>#3 0x00007ffff7db80e4 in ssl3_read_n (s=0x622c70, n=13, max=17741, extend=<value optimized out>) at s3_pkt.c:258</div><div>#4 0x00007ffff7dcaf75 in dtls1_get_record (s=0x622c70) at d1_pkt.c:676</div><div>#5 0x00007ffff7dcb6b8 in dtls1_read_bytes (s=0x622c70, type=22, buf=0x7ffffffedfd0 "\006", len=12, peek=0) at d1_pkt.c:938</div><div>#6 0x00007ffff7dcdda5 in dtls1_get_message_fragment (s=0x622c70, st1=<value optimized out>, stn=4449, max=30, ok=0x7ffffffee09c)</div><div> at d1_both.c:908</div><div>#7 0x00007ffff7dce414 in dtls1_get_message (s=0x622c70, st1=4448, stn=4449, mt=14, max=30, ok=0x7ffffffee09c) at d1_both.c:512</div><div>#8 0x00007ffff7dacaf9 in ssl3_get_server_done (s=0x622c70) at s3_clnt.c:2458</div><div>#9 0x00007ffff7dc8467 in dtls1_connect (s=0x622c70) at d1_clnt.c:466</div><div>#10 0x0000000000402f75 in start_client(char*, char*, int, int, int) ()</div><div>#11 0x0000000000403573 in main ()</div></div><div><br></div><div><br></div><div>Server side back trace</div><div><br></div><div><div>(gdb) info threads</div><div> 2 Thread 0x7ffff793c700 (LWP 20161) 0x0000003db4c0ea2d in recvmsg () from /lib64/libpthread.so.0</div><div>* 1 Thread 0x7ffff793e720 (LWP 20155) 0x0000003db4c0e84d in accept () from /lib64/libpthread.so.0</div><div>(gdb) t 2</div><div>[Switching to thread 2 (Thread 0x7ffff793c700 (LWP 20161))]#0 0x0000003db4c0ea2d in recvmsg () from /lib64/libpthread.so.0</div><div>(gdb) bt</div><div>#0 0x0000003db4c0ea2d in recvmsg () from /lib64/libpthread.so.0</div><div>#1 0x00007ffff7a633a6 in BIO_dgram_sctp_wait_for_dry (b=0x7ffff0001930) at bss_dgram.c:1803</div><div>#2 0x00007ffff7dc7830 in dtls1_accept (s=0x7ffff00008c0) at d1_srvr.c:403</div><div>#3 0x00000000004021ee in connection_handle(void*) ()</div><div>#4 0x0000003db4c07851 in start_thread () from /lib64/libpthread.so.0</div><div>#5 0x0000003db48e890d in clone () from /lib64/libc.so.6</div><div>(gdb)</div></div><div><br></div><div><br></div><div>I am also attaching the wireshark trace (port 4443) and a server key for decoding wireshark.</div><div><br></div><div>Command used on server side: ./dtls_sctp_echo -L 16.181.38.161 -p 4443</div><div><br></div><div>Command used on client side : ./dtls_sctp_echo -L 16.181.38.161 -p 4443 -l 50 -n 5 16.181.38.161</div><div><br></div><div>Thanks in advance for your valuable input</div><div><br></div><div>Regards,</div><div>Mahesh G S</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 21, 2017 at 2:28 PM, Michael Tuexen <span dir="ltr"><<a href="mailto:Michael.Tuexen@lurchi.franken.de" target="_blank">Michael.Tuexen@lurchi.franken.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">> On 21 Feb 2017, at 09:53, mahesh gs <<a href="mailto:mahesh116@gmail.com">mahesh116@gmail.com</a>> wrote:<br>
><br>
> Hi,<br>
><br>
> We have a client, server applications that is using SCTP as a transport protocol. We have to secure the connections using DTLS. I am using openssl version 1.0.2 which supports DTLS. But the problem i am facing is usage of DTLS SCTP related API's. Openssl documentation does not clearly explain all the SCTP related API's and usage sequence.<br>
><br>
> I have tried going though internet and found most of the sites redirect to one link for SCTP DTLS sample code. But this link is not working.<br>
><br>
> <a href="http://sctp.fh-muenster.de/dtls-samples.html" rel="noreferrer" target="_blank">http://sctp.fh-muenster.de/<wbr>dtls-samples.html</a><br>
</span>Try<br>
<a href="http://web.archive.org/web/20150617012520/http://sctp.fh-muenster.de/dtls-samples.html" rel="noreferrer" target="_blank">http://web.archive.org/web/<wbr>20150617012520/http://sctp.fh-<wbr>muenster.de/dtls-samples.html</a><br>
and yes, we need to bring the machine up again.<br>
<br>
Best regards<br>
Michael<br>
<div class="HOEnZb"><div class="h5">><br>
> If any of you has an sample code of DTLS adaptation for SCTP. It would immensely help me for my work.<br>
><br>
> Looking forward to your valuable inputs.<br>
><br>
> Thanks,<br>
> Mahesh G S<br>
</div></div><span class="HOEnZb"><font color="#888888">> --<br>
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