[Standards] Originator & Receiver Concept

Downing, Thomas Thomas.Downing at ipc.com
Fri Mar 14 11:49:02 UTC 2008

As an alternative to SASL, you can get the ip address
of the peer using getpeername( ), and then the domain
name of that address using gethostbyaddr( ).

Note that the domain name may not be the hostname of
the peer, especially if NAT is in line.  So if you 
really need the hostname itself, you would need to
look at the certificate received via SASL.

> -----Original Message-----
> From: standards-bounces at xmpp.org [mailto:standards-bounces at xmpp.org]On
> Behalf Of Justin Karneges
> Sent: Thursday, March 13, 2008 6:04 PM
> To: XMPP Extension Discussion List
> Subject: Re: [Standards] Originator & Receiver Concept
> On Thursday 13 March 2008 11:48 am, Max Indelicato wrote:
> > I guess my question is, how does each server know who is 
> who? How does each
> > server associate an IP/port combo with a hostname 
> ("example.com")? Is there
> > a lookup done? And if so, is there a standard way of doing that?
> >
> > So, say that Server1 connects to Server2 as originator to 
> receiver via TCP.
> > Server1 then sends the initiating stream with the 'to' field set as
> > "example.com", but DOESN'T send a 'from' field identifying 
> itself. How does
> > Server2 know what the originator hostname is? I know that 
> Server2 knows
> > Server1's IP, so does Server2 do a DNS lookup to figure out 
> what Server1's
> > IP resolves to (i.e Server1's hostname)?
> If using SASL, Server1 indicates its identity by 
> authenticating with SASL.  
> Mainly this would work by using TLS authentication, and then 
> with the domain (e.g. "example.com") as the authzid.
> If using Dialback, Server1 indicates its identity with the 
> 'from' attribute in 
> the <db:result> element.
> -Justin

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