Date: Fri, 15 Nov 2002 23:23:33 -0800 From: Rich Morin <rdm@cfcl.com> To: hackers@FreeBSD.ORG Subject: Re: auto-definition of a single network interface Message-ID: <p05200f11b9fba0655ad1@[192.168.254.205]> In-Reply-To: <p05200f10b9fb4d3ddd44@[192.168.254.205]> References: <p05200f10b9fb4d3ddd44@[192.168.254.205]>
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Hearing no objections (:-), I decided to go ahead with this effort.
I have created a script named /etc/rc.ifsgl, which is invoked by
(the FreeBSD 4.7 RELEASE version of) /etc/rc.network, as follows:
183a184,185
> . /etc/rc.ifsgl # handle sgl_ifconfig variable (etc).
>
That is, just before the lines:
dhcp_interfaces=""
for ifn in ${network_interfaces}; do
...
The relevant lines in rc.conf look like:
===
sgl_ifconfig=" inet 192.168.254.193 netmask 255.255.255.0"
sgl_ifconfig_alias0="inet 192.168.254.199 netmask 255.255.255.255"
===
The script itself looks like this:
===
:
# rc.ifsgl - handle sgl_ifconfig and sgl_ifconfig_aliasN variables
#
# Sourced by rc.network; sets ifconfig_XX0 variable if sgl_ifconfig is set
# and exactly one "link" interface has been detected. Also adds aliases,
# as defined by sgl_ifconfig_aliasN variables.
#
# Written by Rich Morin, CFCL, 2002.11
# set -x # DEBUG
# sgl_ifconfig=" inet 192.168.254.193 netmask 255.255.255.0" # DEBUG
# sgl_ifconfig_alias0="inet 192.168.254.199 netmask 255.255.255.255" # DEBUG
# LOG=/tmp/rc.ifsgl.log # DEBUG
for once in aboot; do
if [ "$sgl_ifconfig" ]; then
ifns=`ifconfig -l link`
if [ ! "$ifns" ]; then
echo "rc.ifsgl: no 'link' interfaces found."
break
fi
# echo "ifns=|$ifns|" > /tmp/rc.ifsgl.log # DEBUG
cnt=
for ifn in $ifns; do
eval test=\$ifconfig_${ifn}
if [ "$test" ]; then
echo "rc.ifsgl: interface ($ifn) already defined."
break
fi
cnt=".$cnt"
done
if [ "$test" ]; then
break
fi
if [ "$cnt" != '.' ]; then
echo "rc.ifsgl: more than one interface found."
break
fi
eval ifconfig_${ifn}=\$sgl_ifconfig
# echo "VAR: ifconfig_${ifn}" >> $LOG # DEBUG
# eval echo "VAL: \$ifconfig_${ifn}" >> $LOG # DEBUG
alias=0
while : ; do
eval test=\$sgl_ifconfig_alias${alias}
if [ ! "$test" ]; then
break
fi
eval ifconfig_${ifn}_alias${alias}=\$test
# echo "VAR: ifconfig_${ifn}_alias${alias}" >> $LOG # DEBUG
# eval echo "VAL: \$ifconfig_${ifn}_alias${alias}" >> $LOG # DEBUG
alias=$((${alias} + 1))
done
fi
done
# set +x
===
I am currently using this setup on my production machine, so I guess I'm
pretty confident that it's doing what _I_ need correctly. I'm not at all
sure, however, that I'm taking every other possible system configuration
into account. So, again, comments are solicited...
-r
--
email: rdm@cfcl.com; phone: +1 650-873-7841
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