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synced 2025-12-16 10:32:34 +01:00
121d88743a
The original issue has been exposed due to CloudStack VR would modify the dnsmasq.leases, thus make it unsync with dnsmasq's memory lease. Make the modification to let dnsmasq handle the lease file if dhcp_release is available.
232 lines
5.3 KiB
Bash
Executable File
232 lines
5.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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# edithosts.sh -- edit the dhcphosts file on the routing domain
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usage() {
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printf "Usage: %s: -m <MAC address> -4 <IPv4 address> -6 <IPv6 address> -h <hostname> -d <default router> -n <name server address> -s <Routes> -u <DUID> [-N]\n" $(basename $0) >&2
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}
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mac=
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ipv4=
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ipv6=
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host=
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dflt=
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dns=
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routes=
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duid=
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nondefault=
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while getopts 'm:4:h:d:n:s:6:u:N' OPTION
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do
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case $OPTION in
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m) mac="$OPTARG"
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;;
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4) ipv4="$OPTARG"
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;;
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6) ipv6="$OPTARG"
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;;
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u) duid="$OPTARG"
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;;
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h) host="$OPTARG"
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;;
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d) dflt="$OPTARG"
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;;
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n) dns="$OPTARG"
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;;
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s) routes="$OPTARG"
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;;
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N) nondefault=1
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;;
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?) usage
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exit 2
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;;
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esac
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done
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DHCP_HOSTS=/etc/dhcphosts.txt
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DHCP_OPTS=/etc/dhcpopts.txt
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DHCP_LEASES=/var/lib/misc/dnsmasq.leases
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HOSTS=/etc/hosts
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source /root/func.sh
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lock="biglock"
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#default timeout value is 30 mins as DhcpEntryCommand is not synchronized on agent side any more,
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#and multiple commands can be sent to the same VR at a time
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locked=$(getLockFile $lock 1800)
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if [ "$locked" != "1" ]
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then
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exit 1
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fi
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grep "redundant_router=1" /var/cache/cloud/cmdline > /dev/null
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no_redundant=$?
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dnsmasq_managed_lease=`cat /var/cache/cloud/dnsmasq_managed_lease`
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wait_for_dnsmasq () {
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local _pid=$(pidof dnsmasq)
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for i in 0 1 2 3 4 5 6 7 8 9 10
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do
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sleep 1
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_pid=$(pidof dnsmasq)
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[ "$_pid" != "" ] && break;
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done
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[ "$_pid" != "" ] && return 0;
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logger -t cloud "edithosts: timed out waiting for dnsmasq to start"
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return 1
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}
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if [ $dnsmasq_managed_lease ]
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then
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#release previous dhcp lease if present
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logger -t cloud "edithosts: releasing $ipv4"
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dhcp_release eth0 $ipv4 $(grep "$ipv4 " $DHCP_LEASES | awk '{print $2}') > /dev/null 2>&1
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logger -t cloud "edithosts: released $ipv4"
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fi
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logger -t cloud "edithosts: update $mac $ipv4 $ipv6 $host to hosts"
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[ ! -f $DHCP_HOSTS ] && touch $DHCP_HOSTS
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[ ! -f $DHCP_OPTS ] && touch $DHCP_OPTS
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[ ! -f $DHCP_LEASES ] && touch $DHCP_LEASES
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#delete any previous entries from the dhcp hosts file
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sed -i /$mac/d $DHCP_HOSTS
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if [ $ipv4 ]
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then
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sed -i /$ipv4,/d $DHCP_HOSTS
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fi
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if [ $ipv6 ]
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then
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#searching with [$ipv6], matching other ip so using $ipv6],
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sed -i /$ipv6],/d $DHCP_HOSTS
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fi
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# don't want to do this in the future, we can have same VM with multiple nics/entries
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#sed -i /$host,/d $DHCP_HOSTS
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#put in the new entry
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if [ $ipv4 ]
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then
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echo "$mac,$ipv4,$host,infinite" >>$DHCP_HOSTS
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fi
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if [ $ipv6 ]
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then
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if [ $nondefault ]
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then
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echo "id:$duid,set:nondefault6,[$ipv6],$host,infinite" >>$DHCP_HOSTS
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else
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echo "id:$duid,[$ipv6],$host,infinite" >>$DHCP_HOSTS
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fi
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fi
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if [ $dnsmasq_managed_lease -eq 0 ]
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then
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#delete leases to supplied mac and ip addresses
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if [ $ipv4 ]
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then
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sed -i /$mac/d $DHCP_LEASES
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sed -i /"$ipv4 "/d $DHCP_LEASES
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fi
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if [ $ipv6 ]
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then
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sed -i /$duid/d $DHCP_LEASES
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sed -i /"$ipv6 "/d $DHCP_LEASES
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fi
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sed -i /"$host "/d $DHCP_LEASES
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#put in the new entry
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if [ $ipv4 ]
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then
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echo "0 $mac $ipv4 $host *" >> $DHCP_LEASES
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fi
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if [ $ipv6 ]
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then
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echo "0 $duid $ipv6 $host *" >> $DHCP_LEASES
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fi
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fi
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#edit hosts file as well
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if [ $ipv4 ]
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then
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sed -i /"$ipv4 "/d $HOSTS
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fi
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if [ $ipv6 ]
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then
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sed -i /"$ipv6 "/d $HOSTS
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fi
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sed -i /" $host$"/d $HOSTS
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if [ $ipv4 ]
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then
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echo "$ipv4 $host" >> $HOSTS
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fi
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if [ $ipv6 ]
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then
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echo "$ipv6 $host" >> $HOSTS
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fi
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if [ "$dflt" != "" ]
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then
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#make sure dnsmasq looks into options file
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sed -i /dhcp-optsfile/d /etc/dnsmasq.conf
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echo "dhcp-optsfile=$DHCP_OPTS" >> /etc/dnsmasq.conf
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tag=$(echo $ipv4 | tr '.' '_')
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sed -i /$tag/d $DHCP_OPTS
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if [ "$dflt" == "0.0.0.0" ]
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then
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logger -t cloud "$0: unset default router for $ipv4"
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logger -t cloud "$0: unset dns server for $ipv4"
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echo "$tag,3" >> $DHCP_OPTS
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echo "$tag,6" >> $DHCP_OPTS
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echo "$tag,15" >> $DHCP_OPTS
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fi
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[ "$routes" != "" ] && echo "$tag,121,$routes" >> $DHCP_OPTS
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#delete entry we just put in because we need a tag
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sed -i /$ipv4,/d $DHCP_HOSTS
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#put it back with a tag
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echo "$mac,set:$tag,$ipv4,$host,infinite" >>$DHCP_HOSTS
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fi
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# make dnsmasq re-read files
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pid=$(pidof dnsmasq)
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if [ "$pid" != "" ]
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then
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# use SIGHUP to avoid service outage if dhcp_release is available.
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if [ $dnsmasq_managed_lease ]
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then
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kill -HUP $pid
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else
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service dnsmasq restart
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fi
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else
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if [ $no_redundant -eq 1 ]
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then
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wait_for_dnsmasq
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else
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logger -t cloud "edithosts: skip wait dnsmasq due to redundant virtual router"
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fi
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fi
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ret=$?
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unlock_exit $ret $lock $locked
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