Synnefo » snf-network

#!/bin/bash

# Configuration Fallbacks. All can(must for some of them) be overwritten by /etc/default/snf-network

TTL=300

# the bind server IP/FQDN

SERVER=""

# this is the .vm.synnefo.live.

# Leave empty if only reverse dns management is needed.

# TODO: make this zone to be instance specific!!!

FZONE=""

# the file with dns authorization keys

KEYFILE=""

MAC2EUI64="/usr/bin/mac2eui64"

source /etc/default/snf-network

source /usr/lib/snf-network/common.sh

if [ -z "$SERVER" -o -z "$FZONE" -o ! -e "$KEYFILE" ]; then

  exit 0

fi

update_dns () {

  if [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_CREATE" ]; then

    update_all add

  elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_REMOVE" ]; then

    update_all delete

  elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_RENAME" ]; then

    update_all delete

    # Let's override a variable and add ourselves

    GANETI_INSTANCE_NAME=$GANETI_INSTANCE_NEW_NAME

    update_all add

  elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_STARTUP" ]; then

    update_all add

  elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SHUTDOWN" ]; then

    update_all delete

  elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_REBOOT" ]; then

    update_all add

  elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SET_PARAMS" ]; then

    update_all add

  fi

}

# Query nameserver for entries related to the specific instance

# An example output is the following:

# www.google.com has address 173.194.113.114

# www.google.com has address 173.194.113.115

# www.google.com has address 173.194.113.116

# www.google.com has address 173.194.113.112

# www.google.com has address 173.194.113.113

# www.google.com has IPv6 address 2a00:1450:4001:80b::1012

query_dns () {

  HOSTQ="host -s -R 3 -W 3"

  HOST_IP_ALL=$($HOSTQ $GANETI_INSTANCE_NAME.$FZONE $SERVER | sed -n 's/.*has address //p')

  HOST_IP6_ALL=$($HOSTQ $GANETI_INSTANCE_NAME.$FZONE $SERVER | sed -n 's/.*has IPv6 address //p')

}

# Reset all entries related to the specific instance

# This should be invoced only during instance modification

# because we do not know which nics have been modify

reset_dns () {

  if [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SET_PARAMS" ]; then

    query_dns

    # This should remove the A, AAAA, CNAME entries

    send_command "update delete $GANETI_INSTANCE_NAME.$FZONE"

    for ip in $HOST_IP_ALL; do

      get_rev4_info $ip

      # This should remove the IPv4 reverse entry

      send_command "update delete $RLPART.$RZONE"

    done

    for ip6 in $HOST_IP6_ALL; do

      get_rev6_info $ip6

      # This should remove the IPv6 reverse entry

      send_command "update delete $R6LPART$R6ZONE."

    done

  fi

}

# Main starts here

# Exit if we do not have instance name.

# It should be exported to hooks for instance related opcodes.

if [ -z "$GANETI_INSTANCE_NAME" ]; then

  exit 0

fi

# This runs only for instance modification

reset_dns

# If GANETI_INSTANCE_NIC_COUNT is not set then nothing happens

FIRST=0

LAST=$((GANETI_INSTANCE_NIC_COUNT - 1))

for idx in $(seq $FIRST $LAST); do

  ip=GANETI_INSTANCE_NIC${idx}_IP

  mac=GANETI_INSTANCE_NIC${idx}_MAC

  mode=GANETI_INSTANCE_NIC${idx}_MODE

  link=GANETI_INSTANCE_NIC${idx}_LINK

  subnet=GANETI_INSTANCE_NIC${idx}_NETWORK_SUBNET

  subnet6=GANETI_INSTANCE_NIC${idx}_NETWORK_SUBNET6

  tags=GANETI_INSTANCE_NIC${idx}_NETWORK_TAGS

  eval IP=\$$ip

  eval MAC=\$$mac

  eval MODE=\$$mode

  eval LINK=\$$link

  eval SUBNET=\$$subnet

  eval SUBNET6=\$$subnet6

  eval TAGS=\$$tags

  for tag in $TAGS; do

    case $tag in

    $DNS_TAG)

      get_rev4_info "$IP"

      get_eui64 "$MAC" "$SUBNET6"

      get_rev6_info "$EUI64"

      hooks-log dnshook "update dns for $GANETI_INSTANCE_NAME $IP $EUI64"

      update_dns

      ;;

    esac

  done

done