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#!/bin/sh -
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#
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# $OpenBSD: netstart,v 1.178 2017/04/25 19:17:33 rpe Exp $
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# Turn off Strict Bourne shell mode.
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set +o sh
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# Echo file $1 to stdout. Skip comment lines and delete everything
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# after the first '#' from other lines. Strip leading and trailing
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# whitespace if IFS is set.
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# Usage: stripcom /path/to/file
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stripcom() {
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local _file=$1 _line
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[[ -f $_file ]] || return
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while read _line; do
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[[ -n ${_line%%#*} ]] && print -r -- "$_line"
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done <$_file
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}
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# Parse and "unpack" a hostname.if(5) line given as positional parameters.
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# Fill the _cmds array with the resulting interface configuration commands.
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parse_hn_line() {
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local _af=0 _name=1 _mask=2 _bc=3 _prefix=2 _c _cmd _prev _daddr
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set -A _c -- "$@"
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set -o noglob
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case ${_c[_af]} in
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''|*([[:blank:]])'#'*)
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return
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;;
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inet) ((${#_c[*]} > 1)) || return
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[[ ${_c[_name]} == alias ]] && _mask=3 _bc=4
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[[ -n ${_c[_mask]} ]] && _c[_mask]="netmask ${_c[_mask]}"
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if [[ -n ${_c[_bc]} ]]; then
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_c[_bc]="broadcast ${_c[_bc]}"
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[[ ${_c[_bc]} == *NONE ]] && _c[_bc]=
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fi
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_cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
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;;
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inet6) ((${#_c[*]} > 1)) || return
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if [[ ${_c[_name]} == autoconf ]]; then
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_cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
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rtsolif="$rtsolif $_if"
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return
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fi
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[[ ${_c[_name]} == alias ]] && _prefix=3
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[[ -n ${_c[_prefix]} ]] && _c[_prefix]="prefixlen ${_c[_prefix]}"
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_cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
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;;
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dest) ((${#_c[*]} == 2)) && _daddr=${_c[1]} || return
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_prev=$((${#_cmds[*]} - 1))
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((_prev >= 0)) || return
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set -A _c -- ${_cmds[_prev]}
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_name=3
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[[ ${_c[_name]} == alias ]] && _name=4
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_c[_name]="${_c[_name]} $_daddr"
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_cmds[$_prev]="${_c[@]}"
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;;
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dhcp) _c[0]=
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_cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]} down;dhclient $_if"
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dhcpif="$dhcpif $_if"
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;;
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rtsol) # XXX Support the rtsol keyword for some time to enable a smooth
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# XXX transition to autoconf.
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_c[0]=
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_cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]} up"
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_cmds[${#_cmds[*]}]="ifconfig $_if inet6 autoconf"
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rtsolif="$rtsolif $_if"
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;;
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'!'*) _cmd=$(print -- "${_c[@]}" | sed 's/\$if/'$_if'/g')
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_cmds[${#_cmds[*]}]="${_cmd#!}"
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;;
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*) _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
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;;
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esac
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unset _c
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set +o noglob
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}
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# Start a single interface.
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# Usage: ifstart if1
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ifstart() {
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local _if=$1 _file=$HN_DIR/hostname.$1 _cmds _i=0 _line _stat
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set -A _cmds
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# Interface names must be alphanumeric only. We check to avoid
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# configuring backup or temp files, and to catch the "*" case.
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[[ $_if != +([[:alpha:]])+([[:digit:]]) ]] && return
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if [[ ! -f $_file ]]; then
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echo "netstart: $_file: No such file or directory"
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return
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fi
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# Not using stat(1), we can't rely on having /usr yet.
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set -A _stat -- $(ls -nL $_file)
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if [ "${_stat[0]#???????} ${_stat[2]} ${_stat[3]}" != "--- 0 0" ]; then
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echo "WARNING: $_file is insecure, fixing permissions"
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chmod -LR o-rwx $_file
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chown -LR root.wheel $_file
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fi
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# Check for ifconfig'able interface, except if -n option is specified.
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if ! $PRINT_ONLY; then
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(ifconfig $_if || ifconfig $_if create) >/dev/null 2>&1 ||
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return
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fi
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# Parse the hostname.if(5) file and fill _cmds array with interface
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# configuration commands.
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set -o noglob
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while IFS= read -- _line; do
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parse_hn_line $_line
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done <$_file
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# Apply the interface configuration commands stored in _cmds array.
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while ((_i < ${#_cmds[*]})); do
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if $PRINT_ONLY; then
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print -r -- "${_cmds[_i]}"
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else
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eval "${_cmds[_i]}"
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fi
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((_i++))
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done
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unset _cmds
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set +o noglob
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}
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# Start multiple interfaces by driver name.
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# Usage: ifmstart "em iwm" "trunk vlan"
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# Start "$1" interfaces in order or all interfaces if empty.
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# Don't start "$2" interfaces. "$2" is optional.
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ifmstart() {
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local _sifs=$1 _xifs=$2 _hn _if _sif _xif
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for _sif in ${_sifs:-ALL}; do
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for _hn in /etc/hostname.*; do
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_if=${_hn#/etc/hostname.}
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[[ $_if == '*' ]] && continue
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# Skip unwanted ifs.
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for _xif in $_xifs; do
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[[ $_xif == ${_if%%[0-9]*} ]] && continue 2
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done
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# Start wanted ifs.
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[[ $_sif == @(ALL|${_if%%[0-9]*}) ]] && ifstart $_if
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done
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done
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}
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# IPv6 autoconf the interfaces in the $rtsolif list.
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# Usage: ifv6autoconf
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ifv6autoconf() {
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local _if
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# $ip6kernel will not have been set if we were invoked with a
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# list of interface names
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ifconfig lo0 inet6 >/dev/null 2>&1 || return 0
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for _if in $rtsolif; do
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ifconfig $_if inet6 autoconf
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done
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}
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# Parse /etc/mygate and add default routes for IPv4 and IPv6
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# Usage: defaultroute
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defaultroute() {
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[[ -z $dhcpif ]] && stripcom /etc/mygate | while read gw; do
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[[ $gw == @(*:*) ]] && continue
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route -qn delete default >/dev/null 2>&1
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route -qn add -host default $gw && break
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done
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[[ -z $rtsolif ]] && stripcom /etc/mygate | while read gw; do
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[[ $gw == !(*:*) ]] && continue
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route -qn delete -inet6 default >/dev/null 2>&1
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route -qn add -host -inet6 default $gw && break
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done
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}
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# Make sure the invoking user has the right privileges.
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if (($(id -u) != 0)); then
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echo "${0##*/}: need root privileges"
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exit 1
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fi
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# Get network related vars from rc.conf using the parsing routine from rc.subr.
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FUNCS_ONLY=1 . /etc/rc.d/rc.subr
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_rc_parse_conf
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HN_DIR=${HN_DIR:-/etc}
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PRINT_ONLY=false
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USAGE="USAGE: ${0##*/} [-n] [interface ...]"
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while getopts ":n" opt; do
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case $opt in
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n) PRINT_ONLY=true;;
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*) print -u2 "$USAGE"; exit 1;;
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esac
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done
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shift $((OPTIND-1))
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# Option -n is only supported if interface names are specified as parameters.
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if $PRINT_ONLY && (($# == 0)); then
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print -u2 "Missing parameters.\n$USAGE"
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exit 1
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fi
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# If we were invoked with a list of interface names, just reconfigure these
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# interfaces (or bridges), add default routes and return.
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if (($# > 0)); then
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for _if; do ifstart $_if; done
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ifv6autoconf
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defaultroute
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return
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fi
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# Otherwise, process with the complete network initialization.
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# /etc/myname contains my symbolic name.
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[[ -f /etc/myname ]] && hostname "$(stripcom /etc/myname)"
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# Set the address for the loopback interface. Bringing the interface up,
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# automatically invokes the IPv6 address ::1.
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ifconfig lo0 inet 127.0.0.1/8
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if ifconfig lo0 inet6 >/dev/null 2>&1; then
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# IPv6 configurations.
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ip6kernel=YES
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# Disallow link-local unicast dest without outgoing scope identifiers.
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route -qn add -inet6 fe80:: -prefixlen 10 ::1 -reject >/dev/null
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# Disallow site-local unicast dest without outgoing scope identifiers.
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# If you configure site-locals without scope id (it is permissible
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# config for routers that are not on scope boundary), you may want
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# to comment the line out.
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route -qn add -inet6 fec0:: -prefixlen 10 ::1 -reject >/dev/null
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# Disallow "internal" addresses to appear on the wire.
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route -qn add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject >/dev/null
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# Disallow packets to malicious IPv4 compatible prefix.
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route -qn add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject >/dev/null
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route -qn add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject >/dev/null
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route -qn add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject >/dev/null
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route -qn add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject >/dev/null
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# Disallow packets to malicious 6to4 prefix.
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route -qn add -inet6 2002:e000:: -prefixlen 20 ::1 -reject >/dev/null
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route -qn add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject >/dev/null
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route -qn add -inet6 2002:0000:: -prefixlen 24 ::1 -reject >/dev/null
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route -qn add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject >/dev/null
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# Disallow packets without scope identifier.
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route -qn add -inet6 ff01:: -prefixlen 16 ::1 -reject >/dev/null
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route -qn add -inet6 ff02:: -prefixlen 16 ::1 -reject >/dev/null
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# Completely disallow packets to IPv4 compatible prefix.
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#
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# This may conflict with RFC1933 under following circumstances:
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# (1) An IPv6-only KAME node tries to originate packets to IPv4
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# compatible destination. The KAME node has no IPv4 compatible
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# support. Under RFC1933, it should transmit native IPv6
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# packets toward IPv4 compatible destination, hoping it would
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# reach a router that forwards the packet toward auto-tunnel
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# interface.
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# (2) An IPv6-only node originates a packet to an IPv4 compatible
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# destination. A KAME node is acting as an IPv6 router, and
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# asked to forward it.
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#
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# Due to rare use of IPv4 compatible addresses, and security issues
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# with it, we disable it by default.
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route -qn add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject >/dev/null
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rtsolif=""
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else
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ip6kernel=NO
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fi
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# Configure all the non-loopback interfaces which we know about, but
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# do not start interfaces which must be delayed. Refer to hostname.if(5)
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ifmstart "" "trunk svlan vlan carp gif gre pfsync pppoe tun bridge switch pflow"
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# The trunk interfaces need to come up first in this list.
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# The (s)vlan interfaces need to come up after trunk.
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# Configure all the carp interfaces which we know about before default route.
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ifmstart "trunk svlan vlan carp"
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# Now that $rtsolif has been populated, IPv6 autoconf those interfaces
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ifv6autoconf
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# Look for default routes in /etc/mygate.
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defaultroute
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# Multicast routing.
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if [[ $multicast != YES ]]; then
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route -qn delete 224.0.0.0/4 >/dev/null 2>&1
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route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject >/dev/null
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fi
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# Configure PPPoE, GIF, GRE, TUN and PFLOW interfaces, delayed because they
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# require routes to be set. TUN might depend on PPPoE, and GIF or GRE may
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# depend on either of them. PFLOW might bind to ip addresses configured
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# on either of them.
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ifmstart "pppoe tun gif gre bridge switch pflow"
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# Reject 127/8 other than 127.0.0.1.
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route -qn add -net 127 127.0.0.1 -reject >/dev/null
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if [[ $ip6kernel == YES ]]; then
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# This is to make sure DAD is completed before going further.
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count=0
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while ((count++ < 10 && $(sysctl -n net.inet6.ip6.dad_pending) != 0)); do
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sleep 1
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done
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fi
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