[syslog-ng] IPv6 Link local address use with syslog-ng

[Philip Bellino]

Simon,
I tried  "tcp6(ip(fe80::220:abff:febe:4dac%eth0) port(1468));" in my earlier testing and received the syslog error:

"Error binding socket" addr='AF_INET6(fe80::220:abff:febe:4dac)', error='Invalid argument (22)'

Phil Bellino

-----Original Message-----
From: syslog-ng-bounces at lists.balabit.hu [mailto:syslog-ng-bounces at lists.balabit.hu] On Behalf Of Simon Arlott
Sent: Monday, November 19, 2007 12:41 PM
To: Syslog-ng users' and developers' mailing list
Subject: Re: [syslog-ng] IPv6 Link local address use with syslog-ng

On 19/11/07 09:39, Balazs Scheidler wrote:
> On Fri, 2007-11-16 at 10:38 -0500, Philip Bellino wrote:
>> Hello,
>> 
>> Running syslog-ng-2.0.5 on a Linux host 2.6.22.9.
>> 
>> syslog-ng.conf entry as follows:
>> 
>> source s_all {
>> 
>>         tcp6(ip(2001:470:1f00:1288:220:abff:febe:4dac) port(1468));
>> 
>> };
>> 
>> When syslog-ng is started, the Global address
>> (2001:470:1f00:1288:220:abff:febe:4dac) binds and connects fine.
>> 
>> If I have the Link Local Address configured below:
>> 
>> source s_all {
>> 
>>         tcp6(ip(fe80::220:abff:febe:4dac) port(1468));
>> 
>> };
>> 
>> And start syslog-ng, it either errors on the bind or the 
>> connect(g_connect in gsockaddr.c) with an errno of 22 (Invalid 
>> Argument).
>> 
>> Looking at the code shows that there is no use of the sockaddr_in6 
>> “sin6_scope_id”, which is required to be set when using Link Local 
>> addresses since they need to use the interface number (sin6_scope_id).
>> 
>> Has anyone run into this issue?
>> 
>> If so, is there a workaround or a code patch for this?
> 
> I don't know about any. In fact I'm not using the ipv6 parts myself, 
> so there might be some quirks here and there.
> 
> To be honest, I've absolutely no clue how scope id is usually set. Can 
> you recommend something?
> 

For:
tcp6(ip(fe80::220:abff:febe:4dac%eth0) port(1468));

(address with %eth0 appended)


You'd set the scope id on the address you use to bind (if any), and again on the destination:
...->sin6_scope_id = if_nametoindex("eth0");

--
Simon Arlott