Re: [RFC PATCH 0/2] Add AF_VSOCK support to getnameinfo(3) and getaddrinfo(3)

[Florian Weimer <fweimer@redhat.com>]

On 10/06/2016 01:19 PM, Florian Weimer wrote:

>>> How do you expect that applications will know that they have to pass
>>> AF_VSOCK to getaddrinfo instead of AF_UNSPEC?
>>
>> For example ncat(1) has --unixsock and --udp command-line options.  A
>> --vsock option can be added.  At that point the program knows to use
>> AF_VSOCK and the same getaddrinfo(3) code path can be used by TCP, UDP,
>> UNIX, and vsock.
>
> ncat doesn't use getaddrinfo AFAICS, so this isn't going to help it. The
> larger nmap codebase has a call to getaddrinfo, but the code leading to
> it assumes 16-bit port numbers, so it won't be able to use getaddrinfo
> either.
>
> Do you have a better example?

I've looked briefly at nfs-utils.  I don't see how you can patch in 
AF_VSOCK support using the proposed getaddrinfo support, either.  It 
seems to do the address and service lookup separately.

Thanks,
Florian