Subject: Re: getpeereid() or equivalent
To: Jason Thorpe <firstname.lastname@example.org>
From: Arne H. Juul <email@example.com>
Date: 08/01/2007 11:27:17
> On Jul 31, 2007, at 4:59 PM, Daniel Carosone wrote:
>> You want getsockopt and the SO_PEERCRED option. AFAICT, this is the
>> 'conventional' way of getting this functionality across (at least)
>> Linux and *BSD - the FreeBSD syscall seems to be an extra. (Is it
>> really a syscall, or a convenient library wrapper around getsockopt?)
On Tue, 31 Jul 2007, Jason Thorpe wrote:
> The latter, I believe. If we have the sockopt, might as well have the API
> call as well.
you're both right in that - the FreeBSD getpeereid() is just a wrapper
around getsockopt with their LOCAL_PEERCRED option. But my NetBSD
-current machine has neither SO_PEERCRED nor LOCAL_PEERCRED defined
blackbox:~:$ uname -s -r
blackbox:~:$ grep -r SO_PEERCRED /usr/include/
blackbox:~:$ grep -r LOCAL_PEERCRED /usr/include/
blackbox:~:$ grep -r LOCAL_CREDS /usr/include/
/usr/include/sys/un.h:#define LOCAL_CREDS 0x0001 /* pass
credentials to receiver */
only the LOCAL_CREDS that I mentioned in my first mail is defined.
>> For usage examples, see postgresql or ssh code.
the ssh code looks really bad to me when SO_PEERCRED is undefined.
- Arne H. J.