Re: getnameinfo and various protocol types

[itojun@itojun.org (Jun-ichiro itojun Hagino)]

> > > 	now we have couple of new transport protocols coming, such as SCTP and
> > > 	DCCP.  how can we support service name lookup for those?  i.e.
> > > 	how can we tell getnameinfo(3) to use "sctp" or "dccp" for the 2nd
> > > 	argument of getservbyport(3)?
> > > 	
> > > 	my proposal:
> > > 	define NI_UDP as replacement of NI_DGRAM.  deprecate NI_DGRAM (keep
> > > 	it as an alias to NI_UDP is okay).  define NI_SCTP, NI_DCCP and such.
> > > 	these three are mutually exclusive, and if more than one is specified
> > > 	it would cause EAI_FAIL.
> > 
> > Since getnameinfo in theory should apply to non-Inet protocols
> > I think it would be useful to try to abstract from NI_SCTP and NI_DCCP
> > to something which captures the flavors/attributes of those transports.
> > I don't know if NI_SEQPACKET is descriptive for SCTP and protocols
> > of that flavor.
> > I have no idea what a more abstract name would be descriptive for DCCP.
> 
> 	SCTP supports both SOCK_DGRAM, SOCK_STREAM as well as SOCK_SEQPACKET.
> 	DCCP should be SOCK_DGRAM only, if i understand correctly.
> 
> 	therefore, there's no 1-by-1 mapping from SOCK_xx to IPPROTO_xx.

	to clarify, i agree there should be some way to support non-inet
	protocols, however i'm not sure how service lookup works for non-inet
	protocols.  do people have any examples (such as appletalk or whatever)?

itojun

--------------------------------------------------------------------
IETF IPv6 working group mailing list
ipv6@ietf.org
Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------