File suse-dhclient-script.ns of Package openstack-octavia
#!/bin/bash
#
# Compatible Namespace dhclient-script for network interface.
#
# Copyright (c) 2018 SUSE LINUX Products GmbH, Nuernberg, Germany.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
#
# Authors: Marius Tomaschewski <mt@suse.de>
# Swaminathan Vasudevan <svasudevan@suse.com>
#
test "x$reason" = x -o "x$interface" = x && exit 1
case $reason in
*6) dhclient=dhclient6 ;;
*) dhclient=dhclient ;;
esac
netns=`ip netns identify 2>/dev/null`
set -a # allexport
if mkdir -p /var/log/${netns:+netns/$netns} ; then
(
echo '****************'
echo "$0 $*"
date
echo '----------------'
env
echo '----------------'
) >> "/var/log/${netns:+netns/$netns}/${dhclient}-script.$interface.log"
exec 2>> "/var/log/${netns:+netns/$netns}/${dhclient}-script.$interface.log"
set +a
set -x
fi
prefixlen2netmask()
{
test -n "$1" || return 1
local o i n=0 adr=() len=$(($1))
for o in 0 1 2 3; do
adr[$o]=0
for i in 128 64 32 16 8 4 2 1; do
((n++ < len)) && \
((adr[$o] = ${adr[$o]} + $i))
done
done
echo ${adr[0]}.${adr[1]}.${adr[2]}.${adr[3]}
return 0
}
parse_ipv4_classless_routes()
{
local route_regex='^[0-9]{1,3}([ ][0-9]{1,3}){4,}$'
local rfc_routes=() _routes=()
# check whether it is a list of numbers
[[ $* =~ $route_regex ]] && rfc_routes=($*)
for (( i=0; i < ${#rfc_routes[@]}; )) ; do
net_length=${rfc_routes[$i]}
test $net_length -gt 32 && return 1
((i++))
net_octets=$(($net_length / 8 + ($net_length % 8 ? 1 : 0)))
test ${#rfc_routes[@]} -lt $(( $i + $net_octets + 4 )) && \
return 1
net_netmask=$(prefixlen2netmask $net_length)
net_netmask=(${net_netmask//./ })
net_address=(0 0 0 0)
for(( j=0; j < $net_octets; j++, i++)); do
net_address[$j]=$((${rfc_routes[$i]} & ${net_netmask[$j]}))
done
gateway=(0 0 0 0)
for (( j=0; j < 4; j++, i++ )); do
gateway[$j]=${rfc_routes[$i]}
done
old_IFS=$IFS
IFS='.'
_routes+=("${net_address[*]},${net_netmask[*]},${gateway[*]}")
IFS=$old_IFS
done
echo "${_routes[*]}"
return 0
}
set_ipv4_route()
{
local dest=$1 ; shift
local mask=$1 ; shift
local gate=("$@")
local hops args
hops=()
if [ ${#gate[@]} -gt 1 ] ; then
for((g=0; g<${#gate[@]}; g++)) ; do
hops+=(nexthop ${gate[$g]:+via ${gate[$g]}}
dev $interface weight $((g+1)))
done
elif [ ${#gate[@]} -gt 0 ] ; then
hops+=(${gate[$g]:+via ${gate[$g]}} dev $interface)
fi
[ ${#hops[@]} -eq 0 ] && hops=(dev $interface)
args=("$dest${mask:+/$mask}" $metric_arg ${hops[*]})
err=`LC_ALL=C /sbin/ip route replace ${args[*]} 2>&1` && return 0
case $err in
RTNETLINK*answers:*File*exists) ;;
RTNETLINK*answers:*No*such*process)
#
# The gateway seems to be not reachable via local network
# route (implicitly created by ifconfig based on the IP
# and netmask provided by dhcp).
# Check this, set an explicit host route to the gateway
# over the current interface and try again (bnc#266215).
#
retry=0
for router in ${gate[@]} ; do
matches=$(/sbin/ip -f inet -o route list match $router | \
grep -v ^default | grep -c -v "^$" 2>/dev/null)
if [ -n "$matches" -a $(($matches)) -eq 0 ] ; then
LC_ALL=C /sbin/ip route add $router/32 dev $interface || retry=1
fi
done
if [ $retry -eq 0 ] ; then
LC_ALL=C /sbin/ip route replace ${args[*]} && return 0
fi
;;
esac
return 1
}
get_ipv4_default_gw()
{
if [ "x$new_rfc3442_classless_static_routes_formatted" != x ] ; then
local r route=() gw=()
for r in $new_rfc3442_classless_static_routes_formatted ; do
route=(${r//,/ })
case ${route[0]}/${route[1]} in
0.0.0.0/0.0.0.0)
[ "x${route[2]}" = "x0.0.0.0" ] || \
gw+=(${route[2]})
;;
esac
done
echo "${gw[*]}"
elif [ "$new_routers" != x ] ; then
echo "$new_routers"
fi
}
set_ipv4_routes()
{
if [ "x$new_rfc3442_classless_static_routes_formatted" != x ] ; then
local r route=()
# TODO: multiple gw's to one dest as in $new_routers?
for r in $new_rfc3442_classless_static_routes_formatted ; do
route=(${r//,/ })
set_ipv4_route ${route[*]}
done
elif [ "$new_routers" != x ] ; then
set_ipv4_route default "" $new_routers
fi
}
dhcp6_dad_check()
{
local ifname="$1" word i
local ipaddr="$2"
local noaddr=1 nodad=0 tentative=0 dadfailed=0
test -n "$ifname" -a -n "$ipaddr" || return 1
while read -a word ; do
test "${word[0]}" != "inet6" && continue
noaddr=0
for((i=2; i<${#word[@]}; ++i)) ; do
case ${word[$i]} in
nodad) nodad=1 ;;
tentative) tentative=1 ;;
dadfailed) dadfailed=1 ;;
flags) ((i++))
rx='^[[:xdigit:]]+$'
[[ "${word[$i]}" =~ $rx ]] || continue
hx="0x${word[$i]}"
((hx & 0x02)) && nodad=1
((hx & 0x08)) && dadfailed=1
((hx & 0x40)) && tentative=1
;;
esac
done
((nodad)) && continue
((dadfailed)) && return 3
((tentative)) && return 2
done < <(LC_ALL=C ip -6 addr show dev "${ifname}" to "${ipaddr}" 2>/dev/null)
# on dad failure of dynamic (non-persistent) address,
# the kernel deletes dad failed addresses
# that is, the address is tentative (2) and vanishes
# (4) and is not visible as dadfailed (3).
((noaddr)) && return 4 || return 0
}
dhcp6_dad_wait()
{
local ifname="$1"
local ipaddr="$2"
local -i wsecs=${3:-0}
local -i uwait=25000
local -i loops=$(((wsecs * 1000000) / uwait))
local -i loop=0 ret=0
dhcp6_dad_check "$ifname" "$ipaddr" ; ret=$?
while ((ret == 2 && loop++ < loops)) ; do
usleep $uwait
dhcp6_dad_check "$ifname" "$ipaddr" ; ret=$?
done
return $ret
}
add_to_wordlist()
{
local v="${1}"
local l=(${!v}) ; shift
local a w
for a in ${@} ; do
for w in ${l[@]} ; do
[ "x$w" = "x$a" ] && continue 2
done
l+=($a)
done
eval "$v='${l[@]}'"
}
merge_resolv_conf()
{
local files=()
local fname key values ns
local domain="" search="" server=""
for fname in "$@" ; do
test "X$fname" = "X" && continue
test -f "$fname" && files+=("$fname")
done
while read key values ; do
case $key in
domain) add_to_wordlist domain $values ;;
search) add_to_wordlist search $values ;;
nameserver) add_to_wordlist server $values ;;
esac
done < <(cat "${files[@]}" /dev/null 2>/dev/null)
echo ${domain:+domain $domain}
echo ${search:+search $search}
for ns in $server ; do
echo ${ns:+nameserver $ns}
done
}
write_resolv_conf()
{
case $dhclient in
dhclient)
mkdir -p "/var/run/dhclient/${netns:+netns/$netns}"
{
echo ${new_domain_name:+domain $new_domain_name}
echo ${new_domain_search:+search $new_domain_search}
for ns in $new_domain_name_servers ; do
echo ${ns:+nameserver $ns}
done
} > "/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv4"
;;
dhclient6)
mkdir -p "/var/run/dhclient/${netns:+netns/$netns}"
{
echo ${new_dhcp6_domain_search:+search $new_dhcp6_domain_search}
for ns in $new_dhcp6_name_servers ; do
echo ${ns:+nameserver $ns}
done
} > "/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv6"
;;
esac
merge_resolv_conf \
"/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv4" \
"/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv6" \
> /etc/${netns:+netns/$netns}/resolv.conf 2>/dev/null
}
remove_resolv_conf()
{
case $dhclient in
dhclient)
rm -f -- "/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv4"
;;
dhclient6)
rm -f -- "/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv6"
;;
esac
merge_resolv_conf \
"/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv4" \
"/var/run/dhclient/${netns:+netns/$netns}/resolv.ipv6" \
> /etc/${netns:+netns/$netns}/resolv.conf 2>/dev/null
}
# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
exit_status=$1
if [ -f /etc/${dhclient}-exit-hooks ]; then
. /etc/${dhclient}-exit-hooks
fi
# probably should do something with exit status of the local script
exit $exit_status
}
# Invoke the local dhcp client enter hooks, if they exist.
if [ -f /etc/${dhclient}-enter-hooks ]; then
exit_status=0
. /etc/${dhclient}-enter-hooks
# allow the local script to abort processing of this state
# local script must set exit_status variable to nonzero.
if [ $exit_status -ne 0 ]; then
exit $exit_status
fi
fi
case $dhclient in
dhclient)
if [ "x$new_rfc3442_classless_static_routes" != x ] ; then
new_rfc3442_classless_static_routes_formatted=$(
parse_ipv4_classless_routes $new_rfc3442_classless_static_routes
)
else
unset new_rfc3442_classless_static_routes_formatted
fi
if [ x$new_broadcast_address != x ] ; then
new_broadcast_arg="brd $new_broadcast_address"
elif [ "x$new_subnet_mask" != "x255.255.255.255" ] ; then
new_broadcast_arg="brd +"
fi
if [ x$new_interface_mtu != x -a \
$(( $new_interface_mtu )) -le 576 ] ;
then
# 68 is the minimal legal value, but 576 the real life minimum
unset new_interface_mtu
fi
if [ x$IF_METRIC != x ]; then
metric_arg="metric $IF_METRIC"
fi
;;
dhclient6)
;;
esac
case $reason in
######################################################################
## DHCPv4 #
######################################################################
MEDIUM)
####################################################################
exit_with_hooks 0
;;
PREINIT)
####################################################################
if [ "x$alias_ip_address" != x ]; then
/sbin/ip addr del $alias_ip_address/$alias_subnet_mask dev $interface
fi
# if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
# fi
/sbin/ip link set $interface up
# We need to give the kernel some time to get the interface up.
sleep 1
exit_with_hooks 0
;;
ARPCHECK|ARPSEND)
####################################################################
exit_with_hooks 0
;;
BOUND|RENEW|REBIND|REBOOT)
####################################################################
if [ x$alias_ip_address != x -a x$alias_ip_address != x$old_ip_address -a \
x$new_ip_address != x$old_ip_address ] ;
then
# Possible new alias. Remove old alias.
/sbin/ip addr del $alias_ip_address/$alias_subnet_mask dev $interface
fi
if [ x$old_ip_address != x -a x$old_ip_address != x$new_ip_address ]; then
# IP address changed. Flush to clear routes and ARP cache.
# if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
# fi
fi
if [ x$new_interface_mtu != x ] ; then
/sbin/ip link set $interface mtu $new_interface_mtu
fi
if [ x$new_ip_address != x ] && \
[ x$new_ip_address != x$old_ip_address -o \
x$reason = xBOUND -o x$reason = xREBOOT ]; then
/sbin/ip addr add $new_ip_address/${new_subnet_mask:-32} \
${new_broadcast_arg} \
dev $interface
set_ipv4_routes
fi
if [ x$new_ip_address != x$alias_ip_address -a x$alias_ip_address != x \
-a x$new_ip_address != x$old_ip_address ];
then
/sbin/ip addr add $alias_ip_address/$alias_subnet_mask \
dev $interface
fi
write_resolv_conf
exit_with_hooks 0
;;
EXPIRE|FAIL|RELEASE|STOP)
####################################################################
if [ x$old_ip_address != x ]; then
# if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
# fi
fi
if [ x$alias_ip_address != x ]; then
/sbin/ip addr add $alias_ip_address/$alias_subnet_mask \
dev $interface
fi
remove_resolv_conf
exit_with_hooks 0
;;
TIMEOUT)
####################################################################
if [ x$alias_ip_address != x ]; then
/sbin/ip addr del $alias_ip_address/$alias_subnet_mask \
dev $interface
fi
if [ x$new_ip_address != x -a x$old_ip_address != x$new_ip_address ];
then
/sbin/ip addr add $new_ip_address/${new_subnet_mask:-32} \
${new_broadcast_arg} \
dev $interface
set -- $(get_ipv4_default_gw)
if [ -n "$1" ] && /sbin/arping -q -c 1 -w 5 -I $interface $1 ;
then
if [ x$new_ip_address != x$alias_ip_address ] && \
[ x$alias_ip_address != x ]; then
/sbin/ip addr add $alias_ip_address/$alias_subnet_arg
fi
set_ipv4_routes
write_resolv_conf
exit_with_hooks 0
else
if [ x$old_ip_address != x ]; then
# if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -4 addr flush dev $interface
# fi
fi
remove_resolv_conf
exit_with_hooks 1
fi
fi
;;
######################################################################
## DHCPv6 #
######################################################################
PREINIT6)
####################################################################
# if [ "x$STARTMODE" != "xnfsroot" ] ; then
/sbin/ip -6 addr flush dev $interface scope global permanent
# fi
/sbin/ip link set $interface up
# We need to give the kernel some time to get the interface up.
sleep 1
exit_with_hooks 0
;;
BOUND6|RENEW6|REBIND6|REBOOT6)
####################################################################
if [ x$old_ip6_address != x -a x$old_ip6_address != x$new_ip6_address ];
then
/sbin/ip addr del "$old_ip6_address/$old_ip6_prefixlen" dev $interface
fi
if [ "x$new_ip6_address" != x -a "x$new_ip6_prefixlen" != x ] ; then
/sbin/ip addr replace "$new_ip6_address/$new_ip6_prefixlen" \
scope global dev $interface \
${new_max_life:+valid_lft $new_max_life} \
${new_preferred_life:+preferred_lft $new_preferred_life} \
|| exit_with_hooks 2
echo >&2 "Checking DAD results for $new_ip6_address"
if ! dhcp6_dad_wait "$interface" "$new_ip6_address/$new_ip6_prefixlen" 5 ; then
/sbin/ip addr del "$new_ip6_address/$new_ip6_prefixlen" dev $interface 2>/dev/null
exit_with_hooks 3
fi
fi
write_resolv_conf
exit_with_hooks 0
;;
DEPREF6)
####################################################################
if [ x$cur_ip6_address = x -o x$cur_ip6_prefixlen = x ] ; then
exit_with_hooks 2
fi
/sbin/ip addr change "$cur_ip6_address/$cur_ip6_prefixlen" \
dev $interface scope global preferred_lft 0
exit_with_hooks 0
;;
EXPIRE6|RELEASE6|STOP6)
####################################################################
if [ x$old_ip6_address != x -a x$old_ip6_prefixlen != x ] ; then
/sbin/ip addr del "$old_ip6_address/$old_ip6_prefixlen" \
dev $interface
fi
remove_resolv_conf
exit_with_hooks 0
;;
esac
exit_with_hooks 0