Re: COMPAT_50 vs NET_RT_IFLIST

[Paul Goyette <paul%whooppee.com@localhost>]

On Thu, 25 Apr 2019, Mouse wrote:

> > > > I have, at work, a program, designed and written under 5.2 [...].
> > > > I just now tried running this, with the associated 5.2 userland
> > > > fragments, under an 8.0 kernel [...].
> > Let me know if there's any way I can help.
>
> About all I can think of at the moment would be to try 5.2 userland
> with an 8.0 kernel, with a particular focus on network interfaces
> (things like ifconfig -l, ifconfig -au, etc).  Either replace a 5.2
> system's kernel with an 8.0 kernel or run a 5.2 userland chrooted on an
> 8.0 system, those are how I'd try it.
>
> I don't _think_ anything I've done to the system is relevant here, but
> it would be nice to have that confirmed-or-refuted before I (or anyone
> else  for that matter) starts chasing after it.  The turnkey system in
> question does require some changes in order to run, and it's possible,
> albeit unlikely, that something else slipped in.
>
> I'm going to try to find the time to pull over completely stock 5.2 and
> try that, but (a) it may take some time for me to scrape up the round
> tuits for that and (b) relatively independent attempts to reproduce it
> would be nice in any case.

Well, I'm not super-familiar with setting up test environments using
chroot, but I was unable to get a qemu install of 5.2 (seems that
recent qemu doesn't deal well with piixide driver).  So I created a
new directory, and unpacked the 5.2 base.tgz distribution set in it.

I then did a chroot to the new directory, and tried to run ifconfig.
The results are not what I expected.  First, I verified that I had
all the right pieces inside the chroot directory - everything looks
good - at least its all from the right year!

# ls -l /sbin/ifconfig
-r-xr-xr-x  1 0  20  114557 Nov 28  2012 /sbin/ifconfig
# ldd /sbin/ifconfig
/sbin/ifconfig:
        -lutil.7 => /lib/libutil.so.7
        -lc.12 => /lib/libc.so.12
        -lprop.0 => /lib/libprop.so.0
# ls -l /lib/libutil.so*
lrwxrwxr-x  1 0  20     15 Nov 28  2012 /lib/libutil.so -> 
libutil.so.7.15
lrwxrwxr-x  1 0  20     15 Nov 28  2012 /lib/libutil.so.7 -> 
libutil.so.7.15
-r--r--r--  1 0  20  96585 Nov 28  2012 /lib/libutil.so.7.15
# ls -l /lib/libc.so*
lrwxrwxr-x  1 0  20       14 Nov 28  2012 /lib/libc.so -> libc.so.12.164
lrwxrwxr-x  1 0  20       14 Nov 28  2012 /lib/libc.so.12 -> 
libc.so.12.164
-r--r--r--  1 0  20  1317667 Nov 28  2012 /lib/libc.so.12.164
# ls -l /lib/libprop*
lrwxrwxr-x  1 0  20     14 Nov 28  2012 /lib/libprop.so -> 
libprop.so.0.7
lrwxrwxr-x  1 0  20     14 Nov 28  2012 /lib/libprop.so.0 -> 
libprop.so.0.7
-r--r--r--  1 0  20  82138 Nov 28  2012 /lib/libprop.so.0.7


But, ifconfig fails to run:

# ifconfig -l
ifconfig: getifaddrs: No such file or directory
# ifconfig -a
ifconfig: getifaddrs: No such file or directory


FWIW, this is running on a -current host (8.99.37, from yesterday), and
with the compat_50 (and above) modules loaded.

# modstat | grep compat
compat_50        exec     filesys  -        0       - compat_60
compat_60        exec     filesys  a        1       - compat_70
compat_70        exec     filesys  a        1       - compat_80
compat_80        exec     filesys  a        1       - -
compat_util      misc     builtin  -        0       - -
# uname -a
NetBSD speedy.whooppee.com 8.99.37 NetBSD 8.99.37 (SPEEDY 2019-04-24 23:45:06 UTC) #0: Thu Apr 25 09:00:09 UTC 2019  paul%speedy.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64


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