Re: [twsocket] SSL problem (server stops receiving data)
Thanks for the update Angus! Merijn On 2/1/2016 20:42, Angus Robertson - Magenta Systems Ltd wrote: We've hired someone to look into this issue, this resulted in finding the probable cause of this issue, and a fix. It would be great if someone could sort of validate the conclusion and fix. If all is OK, how to get these changes into the ICS codebase? Your developer updated a six month old WSocket, so I added your changes to the latest version. Building your test application with the old v8.21 causes SSL to die within a second, with the new V8.22 it works OK creating a gigabyte SSL log file with lots of successful requests. I don't understand why your fix works, it seems to execute the same code as before, just in a different place, but clearly there was an SSL problem before in your particular circumstance with overlapping requests which is now fixed. I've rebuilt my web application server and put it on my public web site, where it will get a few hundred thousand requests quickly, although I've not knowingly had any problems before. If there are no new problems, I'll updated SVN in a few days. My test page showing ICS versions is at: https://www.telecom-tariffs.co.uk/serverinfo.htm Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SSL problem (server stops receiving data)
Hi All, We've hired someone to look into this issue, this resulted in finding the probable cause of this issue, and a fix. It would be great if someone could sort of validate the conclusion and fix. If all is OK, how to get these changes into the ICS codebase? Thanks, Merijn On 12/8/2015 17:42, Angus Robertson - Magenta Systems Ltd wrote: I really hope someone can take a look at this, maybe confirm if the problem is reproducible and see if I'm doing something wrong or this is indeed a problem inside ICS / OpenSSL. Sorry, I will not have any time to investigate for several weeks, or longer. Maybe another volunteer here has more free time than I can spare. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SSL problem (server stops receiving data)
> We've hired someone to look into this issue, this resulted in > finding the probable cause of this issue, and a fix. > It would be great if someone could sort of validate the > conclusion and fix. > If all is OK, how to get these changes into the ICS codebase? Zip any ICS units and test applications you created and email them to my email address. If the changes are 'safe', I'll update SVN. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SSL problem (server stops receiving data)
> I really hope someone can take a look at this, maybe confirm if the > problem is reproducible and see if I'm doing something wrong or this is > indeed a problem inside ICS / OpenSSL. Sorry, I will not have any time to investigate for several weeks, or longer. Maybe another volunteer here has more free time than I can spare. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SSL problem (server stops receiving data)
Hi Angus, I agree with what you are saying, but in this case this is not the problem. The only reason this app works like this, is because this seems to be the easiest way to reproduce this same issue which happens in a larger app, which does use a FIFO etc. Log clearly shows that the two random numbers are being received separately on the server side. Merijn On 24/11/2015 17:23, Angus Robertson - Magenta Systems Ltd wrote: The problem is triggered, when we do two times PostMessage(WM_USER) in the OnSslHandshakeDone event, expected behavior would be that the client sends a random number twice, server receives the first, sends x bytes and term char, client receives it, sends next random number (3th), server might be handling the 2nd number, etc. I'd expect the client to send a single TCP/IP packet with both random numbers in it, and for the server to receive both together. So does the server have a FIFO buffer to store the second number for processing later, that take priority over anything received. I had this problem a long time ago with a simple packet protocol. The difference between SSL and non-SSL might be packets being combined. Try putting a delay in when sending, so there is always a two or longer second gap and see if the problem goes away. But the real solution is the FIFO buffer. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
Re: [twsocket] SSL problem (server stops receiving data)
> The problem is triggered, when we do two times PostMessage(WM_USER) > in the OnSslHandshakeDone event, expected behavior would be that > the client sends a random number twice, server receives the first, > sends x bytes and term char, client receives it, sends next random > number (3th), server might be handling the 2nd number, etc. I'd expect the client to send a single TCP/IP packet with both random numbers in it, and for the server to receive both together. So does the server have a FIFO buffer to store the second number for processing later, that take priority over anything received. I had this problem a long time ago with a simple packet protocol. The difference between SSL and non-SSL might be packets being combined. Try putting a delay in when sending, so there is always a two or longer second gap and see if the problem goes away. But the real solution is the FIFO buffer. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
