netstart revision 1.77
1#!/bin/sh - 2# 3# $OpenBSD: netstart,v 1.77 2001/03/13 21:15:09 deraadt Exp $ 4 5# Returns true if $1 contains only alphanumerics 6isalphanumeric() { 7 local _n 8 _n=$1 9 while [ ${#_n} != 0 ]; do 10 case $_n in 11 [A-Za-z0-9]*) ;; 12 *) return 1;; 13 esac 14 _n=${_n#?} 15 done 16 return 0 17} 18 19# /etc/myname contains my symbolic name 20# 21hostname=`cat /etc/myname` 22hostname $hostname 23if [ -f /etc/defaultdomain ]; then 24 domainname `cat /etc/defaultdomain` 25fi 26 27# pick up option configuration 28. /etc/rc.conf 29 30# Configure the IP filter before configuring network interfaces 31if [ X"${ipfilter}" = X"YES" -a -f "${ipfilter_rules}" ]; then 32 echo 'configuring IP filter' 33 ipf -Fa -f ${ipfilter_rules} 34else 35 ipfilter=NO 36fi 37 38# set the address for the loopback interface 39# it will also initialize IPv6 address for lo0 (::1 and others). 40ifconfig lo0 inet localhost 41 42# use loopback, not the wire 43route -n add -host $hostname localhost > /dev/null 44route -n add -net 127 127.0.0.1 -reject > /dev/null 45 46if ifconfig lo0 inet6 >/dev/null 2>&1; then 47 # IPv6 configurations. 48 ip6kernel=YES 49 50 # disallow link-local unicast dest without outgoing scope identifiers. 51 route add -inet6 fe80:: -prefixlen 10 ::1 -reject > /dev/null 52 53 # disallow site-local unicast dest without outgoing scope identifiers. 54 # If you configure site-locals without scope id (it is permissible 55 # config for routers that are not on scope boundary), you may want 56 # to comment the line out. 57 route add -inet6 fec0:: -prefixlen 10 ::1 -reject > /dev/null 58 59 # disallow "internal" addresses to appear on the wire. 60 route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject > /dev/null 61 62 # disallow packets to malicious IPv4 compatible prefix. 63 route add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject > /dev/null 64 route add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject > /dev/null 65 route add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject > /dev/null 66 route add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject > /dev/null 67 68 # disallow packets to malicious 6to4 prefix. 69 route add -inet6 2002:e000:: -prefixlen 20 ::1 -reject > /dev/null 70 route add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject > /dev/null 71 route add -inet6 2002:0000:: -prefixlen 24 ::1 -reject > /dev/null 72 route add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject > /dev/null 73 74 # Completely disallow packets to IPv4 compatible prefix. 75 # This may conflict with RFC1933 under following circumstances: 76 # (1) An IPv6-only KAME node tries to originate packets to IPv4 77 # compatible destination. The KAME node has no IPv4 compatible 78 # support. Under RFC1933, it should transmit native IPv6 79 # packets toward IPv4 compatible destination, hoping it would 80 # reach a router that forwards the packet toward auto-tunnel 81 # interface. 82 # (2) An IPv6-only node originates a packet to an IPv4 compatible 83 # destination. A KAME node is acting as an IPv6 router, and 84 # asked to forward it. 85 # Due to rare use of IPv4 compatible addresses, and security issues 86 # with it, we disable it by default. 87 route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject > /dev/null 88 89 rtsolif="" 90else 91 ip6kernel=NO 92fi 93 94# configure all of the non-loopback interfaces which we know about. 95# refer to hostname.if(5) and bridgename.if(5) 96for hn in /etc/hostname.*; do 97 # Strip off /etc/hostname. prefix 98 if=${hn#/etc/hostname.} 99 100 # Interface names must be alphanumeric only. We check to avoid 101 # configuring backup or temp files, and to catch the "*" case. 102 if ! isalphanumeric "$if"; then 103 continue 104 fi 105 ifconfig $if > /dev/null 2>&1 106 if [ "$?" != "0" ]; then 107 continue 108 fi 109 110 # Now parse the hostname.* file 111 while :; do 112 if [ "$cmd2" ]; then 113 # we are carrying over from the 'read dt dtaddr' last time 114 set -- $cmd2 115 af="$1" name="$2" mask="$3" bcaddr="$4" ext1="$5" cmd2= 116 # make sure and get any remaining args in ext2, like the read below 117 i=1; while [ i -lt 6 -a -n "$1" ]; do shift; let i=i+1; done 118 ext2="$@" 119 else 120 # read the next line or exit the while loop 121 read af name mask bcaddr ext1 ext2 || break 122 fi 123 # $af can be "dhcp", "up", "rtsol", an address family, commands, or 124 # a comment. 125 case "$af" in 126 "#"*|"") # skip comments and empty lines 127 continue 128 ;; 129 "!"*) # parse commands 130 cmd="${af#*!} ${name} ${mask} ${bcaddr} ${ext1} ${ext2}" 131 ;; 132 "bridge") 133 cmd="echo ${hn}: bridges now supported via bridgename.* files" 134 ;; 135 "dhcp") 136 [ "$name" = "NONE" ] && name= 137 [ "$mask" = "NONE" ] && mask= 138 [ "$bcaddr" = "NONE" ] && bcaddr= 139 ifconfig $if $name $mask $bcaddr $ext1 $ext2 down 140 cmd="dhclient $if" 141 ;; 142 "rtsol") 143 ifconfig $if $name $mask $bcaddr $ext1 $ext2 up 144 rtsolif="$rtsolif $if" 145 cmd= 146 ;; 147 "up") 148 # The only one of these guaranteed to be set is $if 149 # the remaining ones exist so that media controls work 150 cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up" 151 ;; 152 *) 153 read dt dtaddr 154 if [ "$name" = "alias" ]; then 155 # perform a 'shift' of sorts 156 alias=$name 157 name=$mask 158 mask=$bcaddr 159 bcaddr=$ext1 160 ext1=$ext2 161 ext2= 162 else 163 alias= 164 fi 165 cmd="ifconfig $if $af $alias $name " 166 case "$dt" in 167 dest) 168 cmd="$cmd $dtaddr" 169 ;; 170 [a-z!]*) 171 cmd2="$dt $dtaddr" 172 ;; 173 esac 174 if [ ! -n "$name" ]; then 175 echo "/etc/hostname.$if: invalid network configuration file" 176 return 177 fi 178 case $af in 179 inet) 180 [ "$mask" ] && cmd="$cmd netmask $mask" 181 if [ "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then 182 cmd="$cmd broadcast $bcaddr" 183 fi 184 [ "$alias" ] && rtcmd="; route -n add -host $name 127.0.0.1" 185 ;; 186 inet6) [ "$mask" ] && cmd="$cmd prefixlen $mask" 187 cmd="$cmd $bcaddr" 188 ;; 189 *) cmd="$cmd $mask $bcaddr" 190 esac 191 cmd="$cmd $ext1 $ext2$rtcmd" rtcmd= 192 ;; 193 esac 194 eval "$cmd" 195 done < /etc/hostname.$if 196done 197 198if [ "$ip6kernel" = "YES" -a "x$rtsolif" != "x" ]; then 199 fw=`sysctl -n net.inet6.ip6.forwarding` 200 ra=`sysctl -n net.inet6.ip6.accept_rtadv` 201 if [ "x$fw" = "x0" -a "x$ra" = "x1" ]; then 202 echo "IPv6 autoconf:$rtsolif" 203 rtsol $rtsolif 204 else 205 echo "WARNING: inconsistent config - check /etc/sysctl.conf for IPv6 autoconf" 206 fi 207fi 208if [ "$ip6kernel" = "YES" ]; then 209 # this is to make sure DAD is completed before going further. 210 sleep `sysctl -n net.inet6.ip6.dad_count` 211 sleep 1 212fi 213 214for bn in /etc/bridgename.*; do 215 # Strip off /etc/bridgename. prefix 216 if=${bn#/etc/bridgename.} 217 218 # Interface names must be alphanumeric only. We check to avoid 219 # configuring backup or temp files, and to catch the "*" case. 220 if ! isalphanumeric "$if"; then 221 continue 222 fi 223 brconfig $if > /dev/null 2>&1 224 if [ "$?" != "0" ]; then 225 continue 226 fi 227 228 # Now parse the bridgename.* file 229 { 230 # All lines are run as brconfig(8) commands. 231 while read line ; do 232 line=${line%%#*} # strip comments 233 test -z "$line" && continue 234 case "$line" in 235 "!"*) 236 cmd="${line#*!}" 237 ;; 238 *) 239 cmd="brconfig $if $line" 240 ;; 241 esac 242 eval "$cmd" 243 done 244 } < /etc/bridgename.$if 245done 246 247# /etc/mygate, if it exists, contains the name of my gateway host 248# that name must be in /etc/hosts. 249if [ -f /etc/mygate ]; then 250 route -n add -host default `cat /etc/mygate` 251fi 252 253# Multicast routing. 254# 255# The routing to the 224.0.0.0/4 net is setup according to these rules: 256# multicast_host multicast_router route comment 257# NO NO -reject no multicast 258# NO YES none installed daemon will run 259# YES/interface NO -interface YES=def. iface 260# Any other combination -reject config error 261case "$multicast_host:$multicast_router" in 262NO:NO) 263 route -n add -net 224.0.0.0/4 -interface 127.0.0.1 -reject> /dev/null 264 ;; 265NO:YES) 266 ;; 267*:NO) 268 set `if [ $multicast_host = YES ]; then 269 ed -s '!route -n show' <<EOF 270/^default/p 271EOF 272 else 273 ed -s "!ifconfig $multicast_host" <<EOF 274/^ inet /p 275EOF 276 fi` 277 route -n add -net 224.0.0.0/4 -interface $2 > /dev/null 278 ;; 279*:*) 280 echo 'config error, multicasting disabled until rc.conf is fixed' 281 route -n add -net 224.0.0.0/4 -interface 127.0.0.1 -reject > /dev/null 282 ;; 283esac 284 285# Configure NAT after configuring network interfaces 286if [ "${ipnat}" = "YES" -a "${ipfilter}" = "YES" -a -f "${ipnat_rules}" ]; then 287 echo 'configuring NAT' 288 ipnat -CF -f ${ipnat_rules} 289else 290 ipnat=NO 291fi 292