Re: /etc/ethers not consulted by ether_hostton() ?
Re: /etc/ethers not consulted by ether_hostton() ?
- Subject: Re: /etc/ethers not consulted by ether_hostton() ?
- From: Marc Balmer <email@hidden>
- Date: Sun, 22 Mar 2009 10:57:53 +0100
Am 22.03.2009 um 08:13 schrieb Terry Lambert:
On Mar 20, 2009, at 6:49 AM, Marc Balmer wrote:
While porting a piece of software from OpenBSD to Mac OS X 10.5.6,
I found
that /etc/ethers seems not to be read by ether_hostton(). I
created an /etc/ethers
file with a few entries, but neither my software nor e.g. tcpdump
finds those
entries.
Does anybody here have some information on this? If this is the
wrong
mailing list to ask, pls tell me which one would be more appropriate.
This appears to be handled in SEL_NAME case in the file
lookup.subproj/file_module.c in the LibInfo project, which is part
of libc/libSystem.
Maybe you are formatting the contents incorrectly for parsing, and
need to look at the source for the parse routine? Alternately,
since it's in the file-module of LibInfo, maybe you have to do some
sort of configuration dance to ensure that it's being consulted (I
would have no idea what).
I expect enumation by ether_line() would work in any case, assuming
your file format was correct, since there are no explicit comparison
items used in that case, as it's an iterator.
Good luck (and before you ask, I have no idea what sort of dance
would be necessary, you'll need to trace the code paths to find out).
Thanks for your reply. In the meantime, with the help of an
opendarwin developer,
I found out the right steps. In short, /etc/ethers seems not to be
supported on
Mac OS X at all and all man pages mentioning seem to be just plain
wrong.
To get it working, a netinfo Ethernets database has to be built and
then ether_hostton()
and friends will use that information. I described this on http://mac.vnode.ch/wake.html
.
- Marc Balmer
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