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#!/bin/bash |
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set -e |
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# Configuration Fallbacks. All can(must for some of them) be overwritten by /etc/default/snf-network |
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TTL=300 |
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# the bind server IP/FQDN |
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SERVER="" |
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# this is the .vm.synnefo.live. |
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# Leave empty if only reverse dns management is needed. |
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# TODO: make this zone to be instance specific!!! |
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FZONE="" |
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# the file with dns authorization keys |
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KEYFILE="" |
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MAC2EUI64="/usr/bin/mac2eui64" |
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source /etc/default/snf-network |
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if [ -z "$SERVER" -o -z "$FZONE" -o -z "$KEYFILE" ]; then |
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exit 0 |
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fi |
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update () {
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local ZONE=$1 |
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local action="$2" |
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nsupdate -k $KEYFILE > /dev/null << EOF |
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server $SERVER |
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zone $ZONE |
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$action |
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send |
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EOF |
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} |
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# ommit zone statement |
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# nsupdate will attempt determine the correct zone to update based on the rest of the input |
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send_command () {
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local command="$1" |
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nsupdate -k $KEYFILE > /dev/null << EOF |
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server $SERVER |
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$command |
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send |
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EOF |
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} |
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addremove_arecord () {
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local action=$1 |
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local command= |
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if [ -n "$IP" ]; then |
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command="update $action $GANETI_INSTANCE_NAME.$FZONE $TTL A $IP" |
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send_command "$command" |
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fi |
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if [ -n "$EUI64" ]; then |
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command="update $action $GANETI_INSTANCE_NAME.$FZONE $TTL AAAA $EUI64" |
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send_command "$command" |
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fi |
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} |
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addremove_ptrrecord () {
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local action=$1 |
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local command= |
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if [ -n "$IP" ]; then |
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command="update $action $RLPART.$RZONE. $TTL PTR $GANETI_INSTANCE_NAME.$FZONE" |
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send_command "$command" |
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fi |
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if [ -n "$EUI64" ]; then |
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command="update $action $R6LPART.$R6ZONE. $TTL PTR $GANETI_INSTANCE_NAME.$FZONE" |
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send_command "$command" |
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fi |
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} |
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# first argument is an eui64 (IPv6) |
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# sets GLOBAL args R6REC, R6ZONE, R6LPART |
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# lets assume eui64=eui64=2001:648:2ffc:1::1 |
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# the following commands produce: |
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# R6REC=1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.c.f.f.2.8.4.6.0.1.0.0.2.ip6.arpa |
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# R6ZONE=1.0.0.0.c.f.f.2.8.4.6.0.1.0.0.2.ip6.arpa |
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# R6LPART=1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0. |
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get_rev6_info () {
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local eui64=$1 |
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if [ -z "$eui64" ]; then |
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R6REC= ; R6ZONE= ; R6LPART= ; |
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else |
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R6REC=$(host $eui64 | egrep -o '([[:alnum:]]\.){32}ip6.arpa' )
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R6ZONE=$(echo $R6REC | awk -F. 'BEGIN{rpart="";} { for (i=32;i>16;i=i-1) rpart=$i "." rpart; } END{print rpart "ip6.arpa";}')
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R6LPART=$(echo $R6REC | awk -F. 'BEGIN{lpart="";} { for (i=16;i>0;i=i-1) lpart=$i "." lpart; } END{print lpart;}')
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fi |
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} |
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# first argument is an ipv4 |
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# sets args RZONE, RLPART |
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# lets assume IP=203.0.113.1 |
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# RZONE="113.0.203.in-add.arpa" |
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# RLPART="1" |
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get_rev4_info () {
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local ip=$1 |
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if [ -z "$ip" ]; then |
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RZONE= ; RLPART= ; |
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else |
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OLDIFS=$IFS |
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IFS=". " |
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set -- $ip |
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a=$1 ; b=$2; c=$3; d=$4; |
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IFS=$OLDIFS |
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RZONE="$c.$b.$a.in-addr.arpa" |
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RLPART="$d" |
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fi |
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} |
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update_dns () {
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if [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_CREATE" ]; then |
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update_arecord add |
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update_ptrrecord add |
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elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_REMOVE" ]; then |
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update_arecord delete |
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update_ptrrecord delete |
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elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_RENAME" ]; then |
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update_arecord delete |
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update_ptrrecord delete |
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# Let's override a variable and add ourselves |
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GANETI_INSTANCE_NAME=$GANETI_INSTANCE_NEW_NAME |
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update_arecord add |
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update_ptrrecord add |
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elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_STARTUP" ]; then |
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update_arecord add |
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update_ptrrecord add |
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elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SHUTDOWN" ]; then |
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update_arecord delete |
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update_ptrrecord delete |
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elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_REBOOT" ]; then |
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update_arecord add |
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update_ptrrecord add |
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elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SET_PARAMS" ]; then |
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update_arecord add |
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update_ptrrecord add |
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fi |
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} |
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# Query nameserver for entries related to the specific instance |
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# An example output is the following: |
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# www.google.com has address 173.194.113.114 |
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# www.google.com has address 173.194.113.115 |
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# www.google.com has address 173.194.113.116 |
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# www.google.com has address 173.194.113.112 |
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# www.google.com has address 173.194.113.113 |
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# www.google.com has IPv6 address 2a00:1450:4001:80b::1012 |
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query_dns () {
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HOSTQ="host -s -R 3 -W 3" |
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HOST_IP_ALL=$($HOSTQ $GANETI_INSTANCE_NAME.$FZONE $SERVER | sed -n 's/.*has address //p') |
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HOST_IP6_ALL=$($HOSTQ $GANETI_INSTANCE_NAME.$FZONE $SERVER | sed -n 's/.*has IPv6 address //p') |
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} |
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# Reset all entries related to the specific instance |
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# This should be invoced only during instance modification |
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# because we do not know which nics have been modify |
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reset_dns () {
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if [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SET_PARAMS" ]; then |
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query_dns |
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# This should remove the A, AAAA, CNAME entries |
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run_action "update delete $GANETI_INSTANCE_NAME.$FZONE" |
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for ip in $HOST_IP_ALL; do |
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get_rev4_info $ip |
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# This should remove the IPv4 reverse entry |
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run_action "update delete $RLPART.$RZONE" |
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done |
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for ip6 in $HOST_IP6_ALL; do |
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get_rev6_info $ip6 |
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# This should remove the IPv6 reverse entry |
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run_action "update delete $R6LPART$R6ZONE." |
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done |
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fi |
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} |
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# Because we do not have IPv6 value in our environment |
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# we caclulate it based on the NIC's MAC and the IPv6 subnet (if any) |
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# first argument MAC second IPv6 subnet |
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# Changes global value EUI64 |
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get_eui64 () {
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local mac=$1 |
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local prefix=$2 |
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if [ -z "$prefix" ]; then |
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EUI64= |
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else |
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EUI64=$($MAC2EUI64 $MAC $SUBNET6) |
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fi |
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} |
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# Main starts here |
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# Exit if we do not have instance name. |
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# It should be exported to hooks for instance related opcodes. |
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if [ -z "$GANETI_INSTNACE_NAME" ]; then |
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exit 0 |
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fi |
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# This runs only for instance modification |
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reset_dns |
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# If GANETI_INSTANCE_NIC_COUNT is not set then nothing happens |
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FIRST=0 |
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LAST=$((GANETI_INSTANCE_NIC_COUNT - 1)) |
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for idx in $(seq $FIRST $LAST); do |
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ip=GANETI_INSTANCE_NIC${idx}_IP
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mac=GANETI_INSTANCE_NIC${idx}_MAC
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mode=GANETI_INSTANCE_NIC${idx}_MODE
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link=GANETI_INSTANCE_NIC${idx}_LINK
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subnet=GANETI_INSTANCE_NIC${idx}_NETWORK_SUBNET
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subnet6=GANETI_INSTANCE_NIC${idx}_NETWORK_SUBNET6
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tags=GANETI_INSTANCE_NIC${idx}_NETWORK_TAGS
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eval IP=\$$ip |
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eval MAC=\$$mac |
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eval MODE=\$$mode |
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eval LINK=\$$link |
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eval SUBNET=\$$subnet |
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eval SUBNET6=\$$subnet6 |
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eval TAGS=\$$tags |
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for tag in $TAGS; do |
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case $tag in |
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$DNS_TAG) |
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get_rev4_info "$IP" |
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get_eui64 "$MAC" "$SUBNET6" |
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get_rev6_info "$EUI64" |
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update_dns |
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;; |
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esac |
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done |
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done |