#!/bin/sh - # # $OpenBSD: netstart,v 1.48 1999/03/29 22:09:58 niklas Exp $ # Returns true if $1 contains only alphanumerics isalphanumeric() { local _n _n=$1 while [ ${#_n} != 0 ]; do case $_n in [A-Za-z0-9]*) ;; *) return 1;; esac _n=${_n#?} done return 0 } # /etc/myname contains my symbolic name # hostname=`cat /etc/myname` hostname $hostname if [ -f /etc/defaultdomain ]; then domainname `cat /etc/defaultdomain` fi # pick up option configuration . /etc/rc.conf # Configure the IP filter before configuring network interfaces if [ X"${ipfilter}" = X"YES" -a -f "${ipfilter_rules}" ]; then echo 'configuring IP filter' ipf -Fa -f ${ipfilter_rules} -E else ipfilter=NO fi # set the address for the loopback interface ifconfig lo0 inet localhost # use loopback, not the wire route -n add -host $hostname localhost route -n add -net 127 127.0.0.1 -reject # configure all of the non-loopback interfaces which we know about. # do this by reading /etc/hostname.* files, where * is the name # of a given interface. # # these files are formatted like the following, but with no # at the # beginning of the line # # addr_family hostname netmask broadcast_addr options # dest dest_addr # # OR # # dhcp # # OR # # bridge # brconfig-arguments [ several lines if needed ] # # addr_family is the address family of the interface, generally inet # hostname is the host name that belongs to the interface, in /etc/hosts. # netmask is the network mask for the interface. # broadcast_addr is the broadcast address for the interface # options are misc. options to ifconfig for the interface. # # dest is simply the string "dest" (no quotes, though) if the interface # has a "destination" (i.e. it's a point-to-point link, like SLIP). # dest_addr is the hostname of the other end of the link, in /etc/hosts # # the only required contents of the file in this mode are the addr_family field # and the hostname. # # dhcp is simply the string "dhcp" (no quotes, though) if the interface # is to be configured using DHCP. See dhclient(8) and dhclient.conf(5) # for details. # # bridge is the string "bridge" (still no quotes). Bridge interfaces # are just configured "up" and then brconfig(8) is called for each # line of arguments following this first line. for hn in /etc/hostname.*; do # Strip off /etc/hostname. prefix if=${hn#/etc/hostname.} # Interface names must be alphanumeric only. We check to avoid # configuring backup or temp files, and to catch the "*" case. if ! isalphanumeric "$if"; then continue fi # Now parse the hostname.* file { read af name mask bcaddr extras # $af can be either "bridge", "dhcp", "up" or an address family. case "$af" in "bridge") ifconfig $if up cmd=`sed "s/\(.*\)/brconfig $if \1;/"` ;; "dhcp") ifconfig $if $extras down cmd="/sbin/dhclient $if" ;; "up") # The only one of these guaranteed to be set is $if cmd="ifconfig $if $name $mask $bcaddr $extras up" ;; *) read dt dtaddr if [ ! -n "$name" ]; then echo "/etc/hostname.$if: invalid network configuration file" exit fi cmd="ifconfig $if $af $name " if [ "${dt}" = "dest" ]; then cmd="$cmd $dtaddr"; fi if [ -n "$mask" ]; then cmd="$cmd netmask $mask"; fi if [ -n "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then cmd="$cmd broadcast $bcaddr"; fi cmd="$cmd $extras"; ;; esac eval "$cmd" } < /etc/hostname.$if done # /etc/mygate, if it exists, contains the name of my gateway host # that name must be in /etc/hosts. if [ -f /etc/mygate ]; then route -n add -host default `cat /etc/mygate` fi # Multicast routing. # # The routing to the 224.0.0.0/4 net is setup according to these rules: # multicast_host multicast_router route comment # NO NO -reject no multicast # NO YES none installed daemon will run # YES/interface NO -interface YES=def. iface # Any other combination -reject config error case "$multicast_host:$multicast_router" in NO:NO) route -n add -net 224.0.0.0/4 -interface 127.0.0.1 -reject;; NO:YES) ;; *:NO) set `if [ $multicast_host = YES ]; then ed -s '!route -n show' <