snf-network-dnshook

#!/bin/bash
#
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# 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=""

# kerberos authentication settings
# Will be used with kstart and ktutil
KERBEROS_PRINCIPAL=
KERBEROS_KEYTAB=/etc/krb5.keytab
KERBEROS_KSTART_ARGS="-H 1 -l 1h"
KERBEROS_TICKET=/var/lib/snf-network/snf-network-kerberos.tkt

# Default authentication method
AUTHENTICATION_METHOD=bind9

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

if [ -z "$SERVER" -o -z "$FZONE" ]; then
  log "SERVER and FZONE not defined! Aborting.."
  exit 0
fi

if [ "$AUTHENTICATION_METHOD" == "bind9" -a -e "$KEYFILE" ]; then
  log "Will use $KEYFILE keyfile for nsupdate (bind9 method)."
elif [ "$AUTHENTICATION_METHOD" == "kerberos" -a -n "$KERBEROS_PRINCIPAL" ]; then
  log "Will use $KERBEROS_PRINCIPAL principal for nsupdate (kerberos method)."
elif [ "$AUTHENTICATION_METHOD" == "plain" ]; then
  log "Will use no authentication (plain method)"
else
  log "No AUTHENTICATION_METHOD defined! Aborting.."
  exit 0
fi


# Main starts here

INSTANCE=$GANETI_INSTANCE_NAME
hostname=$(hostname -f)

# Exit if we do not have instance name.
# It should be exported to hooks for instance related opcodes.
if [ -z "$INSTANCE" ]; then
  exit 0
fi

# Run only in primary node of instance
if [ "$GANETI_INSTANCE_PRIMARY" != "$hostname" ]; then
  exit 0
fi

# This runs only for instance modification
if [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SET_PARAMS" ]; then
  query_dns
  reset_dns
fi

# 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 NETWORK_SUBNET=\$$subnet
  eval NETWORK_SUBNET6=\$$subnet6
  eval NETWORK_TAGS=\$$tags

  for tag in $NETWORK_TAGS; do
    case $tag in
    $DNS_TAG)

      get_info

      if [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_CREATE" ]; then
        update_dns add
      elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_REMOVE" ]; then
        update_dns delete
      elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_RENAME" ]; then
        update_dns delete
        # Let's override a variable and add ourselves
        INSTANCE=$GANETI_INSTANCE_NEW_NAME
        update_dns add
      elif [ "x$GANETI_OP_CODE" = "xOP_INSTANCE_SET_PARAMS" ]; then
        update_dns add
      fi

      ;;
    esac

  done

done