binding to a specific local interface?

Bin Lu blu at
Fri Sep 5 13:44:45 EDT 2014

Yeah, I just figured that out myself. It's on Linux.


-----Original Message-----
From: Benjamin Kaduk [mailto:kaduk at MIT.EDU] 
Sent: Friday, September 05, 2014 10:34 AM
To: Bin Lu
Cc: krbdev at
Subject: Re: binding to a specific local interface?

On Thu, 4 Sep 2014, Bin Lu wrote:

> Hi,
> I am trying to bind the socket to a specific local network interface
> (address) when it make socket connection to the KDC. Does the library 
> have a mechanism to do that? I briefly scanned through the code but it 
> does not seem to have any. If not, then I try to add a new API to pass 
> in the local binding address and do the binding when socket connection 
> is established. My problem is that the newly added API (defined in 
> krb5/krb5.h, and implemented in one of the source files) is always 
> complained as undefined symbol at link time, even though 'nm' output 
> shows it is defined ('t').  Is there any hidden trick that prevents a 
> new API to be added in this lib?

What platform are you on?  Some platforms enforce export symbol lists, such as the one found at src/lib/krb5/libkrb5.exports.  In order to make the symbol visible to consumers of the library, it would need to be added to the export symbol list.


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