X2Go Bug report logs - #1129
x2gobroker-ssh big delay in session status recovery

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Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):

From: Miguel Quero <mquero@one-esecurity.com>

To: submit@bugs.x2go.org

Subject: x2gobroker-ssh big delay in session status recovery

Date: Tue, 20 Dec 2016 12:55:21 +0100

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Package: x2gobroker
Version: 0.0.3.1

When x2gobroker-ssh is used with system with not IPv6 configured, this generate very big delays in x2gobroker listsession task.

Before some research, the problem become from x2gobroker.utils portscan function.

This function propagates a delay in all agents call because it tests first the IPV6 connection:

/ip_proto = 0////try:////socket.getaddrinfo(addr, None, socket.AF_INET6)////ip_proto = 6////except socket.gaierror:////try:////socket.getaddrinfo(addr, None, socket.AF_INET)////ip_proto = 4////except socket.gaierror:////# we can't find a valid address for this host, so returning a failure...////return False /This will be fixed testing IPv4 first or more easily, setting a new option in config to select the ip protocol.

Best regards.
 


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Miguel Quero | One eSecurity | www.one-esecurity.com
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Message #10 received at 1129@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: 1129@bugs.x2go.org

Cc: Miguel Quero <mquero@one-esecurity.com>

Subject: Re: x2gobroker-ssh big delay in session status recovery

Date: Thu, 13 Sep 2018 12:27:15 +0000

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Dear Miguel,

> Package: x2gobroker
> Version: 0.0.3.1
>
> When x2gobroker-ssh is used with system with not IPv6 configured,  
> this generate very big delays in x2gobroker listsession task.
>
> Before some research, the problem become from x2gobroker.utils  
> portscan function.
>
> This function propagates a delay in all agents call because it tests  
> first the IPV6 connection:
>
> /ip_proto = 0////try:////socket.getaddrinfo(addr, None,  
> socket.AF_INET6)////ip_proto = 6////except  
> socket.gaierror:////try:////socket.getaddrinfo(addr, None,  
> socket.AF_INET)////ip_proto = 4////except socket.gaierror:////# we  
> can't find a valid address for this host, so returning a  
> failure...////return False /This will be fixed testing IPv4 first or  
> more easily, setting a new option in config to select the ip protocol.
>

A while ago you reported the above issue.

I tested this now.

The portscan function in x2gobroker.utils is really fast when  
detecting that a remote host is not IPv6 supportive. It basically is a  
fast DNS query.

Is it so, that your client system has IPv4 disabled entirely (in the  
kernel)? Or what exactly did you mean by "When x2gobroker-ssh is used  
with system with not IPv6 configured..."?

I am willing to do more test, please provide more info. You possibly  
also have found a fix meanwhile. If so, I'd be happy, if you could  
share it.

Thanks
Mike




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