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openntpd-openbsd
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Source code pulled from OpenBSD for OpenNTPD. The place to contribute to this code is via the OpenBSD CVS tree.
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openntpd-openbsd/src/etc/netstart

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#!/bin/sh -
#
# $OpenBSD: netstart,v 1.205 2020/05/22 13:38:44 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. 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