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- #!/bin/sh -
- #
- # $OpenBSD: netstart,v 1.202 2020/01/15 00:19:40 kn Exp $
-
- # Turn off Strict Bourne shell mode.
- set +o sh
-
- # Show usage of the netstart script and exit.
- usage() {
- print -u2 "usage: ${0##*/} [[-n] interface ...]"
- exit 1
- }
-
- # Echo file $1 to stdout. Skip comment lines and delete everything
- # after the first '#' from other lines. Strip leading and trailing
- # whitespace if IFS is set.
- # Usage: stripcom /path/to/file
- stripcom() {
- local _file=$1 _line
-
- [[ -f $_file ]] || return
-
- while read _line; do
- [[ -n ${_line%%#*} ]] && print -r -- "$_line"
- done <$_file
- }
-
- # Parse and "unpack" a hostname.if(5) line given as positional parameters.
- # Fill the _cmds array with the resulting interface configuration commands.
- parse_hn_line() {
- local _af=0 _name=1 _mask=2 _bc=3 _prefix=2 _c _cmd _prev _daddr
- set -A _c -- "$@"
- set -o noglob
-
- case ${_c[_af]} in
- ''|*([[:blank:]])'#'*)
- return
- ;;
- inet) ((${#_c[*]} > 1)) || return
- [[ ${_c[_name]} == alias ]] && _mask=3 _bc=4
- [[ -n ${_c[_mask]} ]] && _c[_mask]="netmask ${_c[_mask]}"
- if [[ -n ${_c[_bc]} ]]; then
- _c[_bc]="broadcast ${_c[_bc]}"
- [[ ${_c[_bc]} == *NONE ]] && _c[_bc]=
- fi
- _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
- ;;
- inet6) ((${#_c[*]} > 1)) || return
- if [[ ${_c[_name]} == autoconf ]]; then
- _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
- V6_AUTOCONF=true
- return
- fi
- [[ ${_c[_name]} == alias ]] && _prefix=3
- [[ -n ${_c[_prefix]} ]] && _c[_prefix]="prefixlen ${_c[_prefix]}"
- _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
- ;;
- dest) ((${#_c[*]} == 2)) && _daddr=${_c[1]} || return
- _prev=$((${#_cmds[*]} - 1))
- ((_prev >= 0)) || return
- set -A _c -- ${_cmds[_prev]}
- _name=3
- [[ ${_c[_name]} == alias ]] && _name=4
- _c[_name]="${_c[_name]} $_daddr"
- _cmds[$_prev]="${_c[@]}"
- ;;
- dhcp) _c[0]=
- _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]} up;dhclient $_if"
- V4_DHCPCONF=true
- ;;
- '!'*) _cmd=$(print -- "${_c[@]}" | sed 's/\$if/'$_if'/g')
- _cmds[${#_cmds[*]}]="${_cmd#!}"
- ;;
- *) _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}"
- ;;
- esac
- unset _c
- set +o noglob
- }
-
- # Create interface $1 if it does not yet exist.
- # Usage: ifcreate if1
- ifcreate() {
- local _if=$1
-
- { ifconfig $_if || ifconfig $_if create; } >/dev/null 2>&1
- }
-
- # Create interfaces for network pseudo-devices referred to by hostname.if files.
- # Usage: vifscreate
- vifscreate() {
- local _vif _hn _if
-
- for _vif in $(ifconfig -C); do
- for _hn in /etc/hostname.${_vif}+([[:digit:]]); do
- [[ -f $_hn ]] || continue
- _if=${_hn#/etc/hostname.}
-
- if ! ifcreate $_if; then
- print -u2 "${0##*/}: create for '$_if' failed."
- fi
- done
- done
- }
-
- # Start a single interface.
- # Usage: ifstart if1
- ifstart() {
- local _if=$1 _hn=/etc/hostname.$1 _cmds _i=0 _line _stat
- set -A _cmds
-
- # Interface names must be alphanumeric only. We check to avoid
- # configuring backup or temp files, and to catch the "*" case.
- [[ $_if != +([[:alpha:]])+([[:digit:]]) ]] && return
-
- if [[ ! -f $_hn ]]; then
- print -u2 "${0##*/}: $_hn: No such file or directory."
- return
- fi
-
- # Not using stat(1), we can't rely on having /usr yet.
- set -A _stat -- $(ls -nL $_hn)
- if [[ "${_stat[0]}${_stat[2]}${_stat[3]}" != *---00 ]]; then
- print -u2 "WARNING: $_hn is insecure, fixing permissions."
- chmod -LR o-rwx $_hn
- chown -LR root:wheel $_hn
- fi
-
- # Check for ifconfig'able interface, except if -n option is specified.
- if ! $PRINT_ONLY; then
- ifcreate $_if || return
- fi
-
- # Parse the hostname.if(5) file and fill _cmds array with interface
- # configuration commands.
- set -o noglob
- while IFS= read -- _line; do
- parse_hn_line $_line
- done <$_hn
-
- # Apply the interface configuration commands stored in _cmds array.
- while ((_i < ${#_cmds[*]})); do
- if $PRINT_ONLY; then
- print -r -- "${_cmds[_i]}"
- else
- eval "${_cmds[_i]}"
- fi
- ((_i++))
- done
- unset _cmds
- set +o noglob
- }
-
- # Start multiple interfaces by driver name.
- # Usage: ifmstart "em iwm" "trunk vlan"
- # Start "$1" interfaces in order or all interfaces if empty.
- # Don't start "$2" interfaces. "$2" is optional.
- ifmstart() {
- local _sifs=$1 _xifs=$2 _hn _if _sif _xif
-
- for _sif in ${_sifs:-ALL}; do
- for _hn in /etc/hostname.+([[:alpha:]])+([[:digit:]]); do
- [[ -f $_hn ]] || continue
- _if=${_hn#/etc/hostname.}
-
- # Skip unwanted ifs.
- for _xif in $_xifs; do
- [[ $_xif == ${_if%%[0-9]*} ]] && continue 2
- done
-
- # Start wanted ifs.
- [[ $_sif == @(ALL|${_if%%[0-9]*}) ]] && ifstart $_if
- done
- done
- }
-
- # Parse /etc/mygate and add default routes for IPv4 and IPv6.
- # Usage: defaultroute
- defaultroute() {
- local _cmd;
-
- ! $V4_DHCPCONF && stripcom /etc/mygate |
- while read gw; do
- [[ $gw == @(*:*) ]] && continue
- _cmd="route -qn add -host default $gw"
- if $PRINT_ONLY; then
- print -r -- "$_cmd" && break
- else
- $_cmd && break
- fi
- done
- ! $V6_AUTOCONF && stripcom /etc/mygate |
- while read gw; do
- [[ $gw == !(*:*) ]] && continue
- _cmd="route -qn add -host -inet6 default $gw"
- if $PRINT_ONLY; then
- print -r -- "$_cmd" && break
- else
- $_cmd && break
- fi
- done
- }
-
- # Make sure the invoking user has the right privileges. Check for presence of
- # id(1) to avoid problems with diskless setups.
- if [[ -x /usr/bin/id ]] && (($(id -u) != 0)); then
- echo "${0##*/}: need root privileges"
- exit 1
- fi
-
- # Get network related vars from rc.conf using the parsing routine from rc.subr.
- FUNCS_ONLY=1 . /etc/rc.d/rc.subr
- _rc_parse_conf
-
- PRINT_ONLY=false
- V4_DHCPCONF=false
- V6_AUTOCONF=false
-
- while getopts ":n" opt; do
- case $opt in
- n) PRINT_ONLY=true;;
- *) usage;;
- esac
- done
- shift $((OPTIND-1))
-
- # Option -n is only supported if interface names are specified as parameters.
- $PRINT_ONLY && (($# == 0)) && usage
-
- # Load key material for the generation of IPv6 Semantically Opaque Interface
- # Identifiers (SOII) used for link local and SLAAC addresses.
- $PRINT_ONLY || [[ ! -f /etc/soii.key ]] ||
- sysctl -q "net.inet6.ip6.soiikey=$(</etc/soii.key)"
-
- # If we were invoked with a list of interface names, just reconfigure these
- # interfaces (or bridges), add default routes and return.
- if (($# > 0)); then
- for _if; do ifstart $_if; done
- defaultroute
- return
- fi
-
- # Otherwise, process with the complete network initialization.
-
- # /etc/myname contains my symbolic name.
- [[ -f /etc/myname ]] && hostname "$(stripcom /etc/myname)"
-
- # Set the address for the loopback interface. Bringing the interface up,
- # automatically invokes the IPv6 address ::1.
- ifconfig lo0 inet 127.0.0.1/8
-
- # IPv6 configuration.
- if ifconfig lo0 inet6 >/dev/null 2>&1; then
- ip6kernel=YES
-
- # Disallow link-local unicast dest without outgoing scope identifiers.
- route -qn add -inet6 fe80:: -prefixlen 10 ::1 -reject
-
- # Disallow site-local unicast dest without outgoing scope identifiers.
- # If you configure site-locals without scope id (it is permissible
- # config for routers that are not on scope boundary), you may want
- # to comment the line out.
- route -qn add -inet6 fec0:: -prefixlen 10 ::1 -reject
-
- # Disallow "internal" addresses to appear on the wire.
- route -qn add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject
-
- # Disallow packets to malicious 6to4 prefix.
- route -qn add -inet6 2002:e000:: -prefixlen 20 ::1 -reject
- route -qn add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject
- route -qn add -inet6 2002:0000:: -prefixlen 24 ::1 -reject
- route -qn add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject
-
- # Disallow packets without scope identifier.
- route -qn add -inet6 ff01:: -prefixlen 16 ::1 -reject
- route -qn add -inet6 ff02:: -prefixlen 16 ::1 -reject
-
- # Completely disallow packets to IPv4 compatible prefix.
- #
- # This may conflict with RFC1933 under following circumstances:
- # (1) An IPv6-only KAME node tries to originate packets to IPv4
- # compatible destination. The KAME node has no IPv4 compatible
- # support. Under RFC1933, it should transmit native IPv6
- # packets toward IPv4 compatible destination, hoping it would
- # reach a router that forwards the packet toward auto-tunnel
- # interface.
- # (2) An IPv6-only node originates a packet to an IPv4 compatible
- # destination. A KAME node is acting as an IPv6 router, and
- # asked to forward it.
- #
- # Due to rare use of IPv4 compatible addresses, and security issues
- # with it, we disable it by default.
- route -qn add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject
- else
- ip6kernel=NO
- fi
-
- # Create all the pseudo interfaces up front.
- vifscreate
-
- # Configure all the non-loopback interfaces which we know about, but
- # do not start interfaces which must be delayed. Refer to hostname.if(5)
- ifmstart "" "aggr trunk svlan vlan carp pppoe tun tap gif etherip gre egre mobileip pflow"
-
- # The aggr and trunk interfaces need to come up first in this list.
- # The (s)vlan interfaces need to come up after trunk.
- # Configure all the carp interfaces which we know about before default route.
- ifmstart "aggr trunk svlan vlan carp pppoe"
-
- # Set default routes for IPv4 and IPv6.
- defaultroute
-
- # Multicast routing.
- if [[ $multicast != YES ]]; then
- route -qn delete 224.0.0.0/4 >/dev/null 2>&1
- route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject >/dev/null
- fi
-
- # Reject 127/8 other than 127.0.0.1.
- route -qn add -net 127 127.0.0.1 -reject >/dev/null
-
- # Configure interfaces that rely on routing
- ifmstart "tun tap gif etherip gre egre mobileip pflow"
-
- if [[ $ip6kernel == YES ]]; then
- # Ensure IPv6 Duplicate Address Detection (DAD) is completed.
- count=0
- while ((count++ < 10 && $(sysctl -n net.inet6.ip6.dad_pending) != 0)); do
- sleep 1
- done
- fi
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