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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">We are using the latest published version of noPoll.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Your suggestion of blocking nopoll_conn_wait_until_connection_ready would not fix the
<br>
issue since the SSL_connect() returns error well before that (SSL_ERROR_SYSCALL).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">As I mentioned in the original report, I had put a small timeout as a workaround.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">However, when we started testing against a Websocket server a long distance away<br>
(California, US to Belgium) the problem resurfaced. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Yesterday, I spent some time digging into the problem further. Turns out that
<br>
if I increased the timeout to a large value (300 ms instead of 10 ms) the connection<br>
starts working. I rationalized that if the TCP connect completes (3 way handshake)<br>
<b>before</b> we hand the socket over to SSL/TLS for processing, the problem goes away.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So now I implemented a new workaround. I wait for the TCP connection to complete<br>
before telling SSL library the socket fd using SSL_set_fd().<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I modified nopoll_conn.c as follows:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:green">/* set socket */<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">wait_for_socket_connect(conn->session);
<span style="color:green">// workaround -- RPK<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">SSL_set_fd (conn->ssl, conn->session);</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Where the wait_for_socket_connect is implemented as follows in nopoll_conn.c :<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:blue">static</span><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">int</span> wait_for_socket_connect(<span style="color:blue">int</span> socketfd)
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:green">// On windows, when connect() is called on non-blocking call<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:green">// connection succeeded if the socket is ready for writing<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> fd_set write_fdset, except_fdset;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">struct</span> timeval timeout;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> FD_ZERO(&write_fdset);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> FD_ZERO(&except_fdset);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> FD_SET((<span style="color:blue">unsigned</span>
<span style="color:blue">int</span>) socketfd, &write_fdset );<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> FD_SET((<span style="color:blue">unsigned</span>
<span style="color:blue">int</span>) socketfd, &except_fdset );<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:green">// Wait upto 2 seconds<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> timeout.tv_sec = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> timeout.tv_usec = 2000000;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> select( 0, NULL, &write_fdset, &except_fdset, &timeout);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:green">// connection failed<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">if</span> (FD_ISSET(socketfd, &except_fdset)) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">return</span> -1;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:green">// successful connection<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">else</span> <span style="color:blue">if</span> (FD_ISSET(socketfd, &write_fdset)) {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">return</span> 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:blue">return</span> -1;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It is very strange that this problem occurs only from the second connection using<br>
the library. You should be able to reproduce the problem using the test program<br>
I posted in the original report. I understand that the OpenSSL library is supposed to<br>
automatically take care of this and there should not be any need to wait<br>
for the base TCP connection to be established beforehand. But for some reason it does not.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The above workaround is holding up for now but we would like to resolve this<br>
properly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rahul<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rahul Kale<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">IP Video Systems<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Barco, Inc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">1287 Anvilwood Ave<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sunnyvale, CA 94089<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tel +1 408 400 4238<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
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<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Kale, Rahul
<br>
<b>Sent:</b> Thursday, November 19, 2015 3:14 PM<br>
<b>To:</b> nopoll@lists.aspl.es<br>
<b>Cc:</b> 'Francis Brosnan Blázquez'<br>
<b>Subject:</b> RE: [noPoll] Issue with using Secure Sockets client connecion (wss://) from Windows<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Any resolution to the issue regarding this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In spite of the workaround mentioned below, we see this fail<br>
in certain cases.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rahul<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">Rahul Kale<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">IP Video Systems<o:p></o:p></p>
<p class="MsoNormal">Barco, Inc<o:p></o:p></p>
<p class="MsoNormal">1287 Anvilwood Ave<o:p></o:p></p>
<p class="MsoNormal">Sunnyvale, CA 94089<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
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<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:nopoll-bounces@lists.aspl.es">nopoll-bounces@lists.aspl.es</a> [<a href="mailto:nopoll-bounces@lists.aspl.es">mailto:nopoll-bounces@lists.aspl.es</a>]
<b>On Behalf Of </b>Kale, Rahul<br>
<b>Sent:</b> Tuesday, September 08, 2015 6:35 PM<br>
<b>To:</b> <a href="mailto:nopoll@lists.aspl.es">nopoll@lists.aspl.es</a><br>
<b>Subject:</b> [noPoll] Issue with using Secure Sockets client connecion (wss://) from Windows<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am facing an issue with using noPoll library for Secure Websockets (wss://)<o:p></o:p></p>
<p class="MsoNormal">client connection on Windows platform. Basically, the first connection from<o:p></o:p></p>
<p class="MsoNormal">the same binary works but subsequent connections do not work reliably.<o:p></o:p></p>
<p class="MsoNormal">When I tried to debug the issue, by enabling logs, the problem goes away.<o:p></o:p></p>
<p class="MsoNormal">Strangely, if I install my own log handler with an empty (do nothing)<o:p></o:p></p>
<p class="MsoNormal">implementation, the problem also goes away.<o:p></o:p></p>
<p class="MsoNormal">I have been trying to track down the problem the past week and finally have<o:p></o:p></p>
<p class="MsoNormal">something to report.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Firstly, I have isolated the code (see below) to the bare minimum below for you to reproduce the<o:p></o:p></p>
<p class="MsoNormal">issue. The code makes 100 back to back connections in a loop and exits the loop<o:p></o:p></p>
<p class="MsoNormal">early if it fails. This code rarely lasts for 2 or more loops. However if you
<o:p></o:p></p>
<p class="MsoNormal">enable logs (setting nopoll_log_set_handler to true) or install a log
<o:p></o:p></p>
<p class="MsoNormal">handler (using nopoll_log_set_handler), it will make 100 successful connections.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Since logging did not help, I ended up compiling the noPoll source myself for further<o:p></o:p></p>
<p class="MsoNormal">debugging. Since I am using VS 2008, I had to fix the code here and there to get it<o:p></o:p></p>
<p class="MsoNormal">to compile and also had to add __declspec(dllexport) to most functions in the header file.<o:p></o:p></p>
<p class="MsoNormal">By adding trial and error printfs I narrowed down the spot when it fails.<o:p></o:p></p>
<p class="MsoNormal">Whenever the connect fails, the SSL_connect() function errors out with
<o:p></o:p></p>
<p class="MsoNormal">SSL_ERROR_SYSCALL at around line 756 in nopoll_conn.c.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Assuming that there is some timing issue (since logging adds just enough delay),
<o:p></o:p></p>
<p class="MsoNormal">I have put a temporary fix as a workaround which fixes the issue: I added
<o:p></o:p></p>
<p class="MsoNormal">a nopoll_sleep() just before SSL_connect() like so:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> nopoll_sleep (10000);<o:p></o:p></p>
<p class="MsoNormal"> while (SSL_connect (conn->ssl) <= 0) {<o:p></o:p></p>
<p class="MsoNormal"> …<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am sure you will find the root cause and have a better fix.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Here is the sample code:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">#include "nopoll.h"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">static void noPollLogger(noPollCtx *ctx, noPollDebugLevel level, const char *log_msg, noPollPtr user_data) {<o:p></o:p></p>
<p class="MsoNormal"> // Do nothing here<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">int ConnectToWebsocket()<o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> noPollCtx * context = nopoll_ctx_new();<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> //nopoll_log_set_handler(context, noPollLogger, NULL);<o:p></o:p></p>
<p class="MsoNormal"> nopoll_log_enable(context, false);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> noPollConnOpts * opts = nopoll_conn_opts_new();<o:p></o:p></p>
<p class="MsoNormal"> nopoll_conn_opts_ssl_peer_verify(opts, false); // disable cert verification<o:p></o:p></p>
<p class="MsoNormal"> noPollConn * connection = nopoll_conn_tls_new(context, opts, "10.1.2.3", "443", NULL,<o:p></o:p></p>
<p class="MsoNormal"> "wss://10.1.2.3:443/wstunnel/?dst=127.0.0.1:6060", "tunnel-protocol", "some-origin");<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> bool connected = true;<o:p></o:p></p>
<p class="MsoNormal"> int count = 0;<o:p></o:p></p>
<p class="MsoNormal"> while (!nopoll_conn_is_ready(connection)) {<o:p></o:p></p>
<p class="MsoNormal"> if (!nopoll_conn_is_ok(connection)) {<o:p></o:p></p>
<p class="MsoNormal"> connected = false;<o:p></o:p></p>
<p class="MsoNormal"> break;<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"> nopoll_sleep(10000);<o:p></o:p></p>
<p class="MsoNormal"> fprintf(stdout, "Info: Waiting for connection...\n", count++);<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> if (connected) {<o:p></o:p></p>
<p class="MsoNormal"> fprintf(stdout, "Info: Connected!!\n");<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"> else {<o:p></o:p></p>
<p class="MsoNormal"> fprintf(stdout, "Failed websocket connection\n");<o:p></o:p></p>
<p class="MsoNormal"> exit(1);<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> nopoll_conn_close(connection);<o:p></o:p></p>
<p class="MsoNormal"> nopoll_ctx_unref(context);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> return 0;<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">int main(int argc, char *argv[])<o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal"> for (int i = 0; i < 100; i++) {<o:p></o:p></p>
<p class="MsoNormal"> ConnectToWebsocket();<o:p></o:p></p>
<p class="MsoNormal"> fprintf(stderr, "Done Loop %d\n", i);<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"> return 0;<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rahul<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rahul Kale<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">IP Video Systems<o:p></o:p></p>
<p class="MsoNormal">Barco, Inc<o:p></o:p></p>
<p class="MsoNormal">1287 Anvilwood Ave<o:p></o:p></p>
<p class="MsoNormal">Sunnyvale, CA 94089<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tel +1 408 400 4238<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif"">This message is subject to the following terms and conditions:
<a href="http://www.barco.com/en/maildisclaimer">MAIL DISCLAIMER</a> <o:p></o:p></span></p>
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This message is subject to the following terms and conditions: <a href="http://www.barco.com/en/maildisclaimer">
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