root/alternc-slavedns/branches/r0/slavedns

#!/bin/sh
# Synchronize a dns server with alternc's remote server : 
# the configuration files contains definitions for remote masters.

CONFDIR=/etc/slavedns
CACHEDIR=/var/cache/slavedns
BINDDIR=/etc/bind/slavedns

function CreateBindConf {
    CFILE="$1"
    MASTER="$2"
    rm ${BINDDIR}/${CFILE}
    cat ${CFILE} | (read A; while [ "$A" ];  # Treat each domain one by one.
          do 
          echo "zone \"$A\" { type slave; allow-query { any; }; file \"$A\"; masters { $MASTER; }; };" >>${BINDDIR}/${CFILE}
          read A
          done)
}


# Main procedure : parse each config file and download the raw slave list.
# if something changed in a list, call CreateBindConf $i 

cd $CONFDIR

RELOAD=""
for i in `ls * | grep -v slavedns.conf`
  do
  # HOST LOGIN PASSWORD 
  HOST=""
  LOGIN=""
  PASSWORD=""
  SSL=""
  . $i
  if [ -n "$HOST" -o -n "$LOGIN" -o -n "$PASSWORD" ]
      then
      echo "Error in the config file '$i'"
  else
      echo -n "Processing '$i' "
      if [ "$SSL" ] 
          then
          PROTOCOL="https"
          else
          PROTOCOL="http"
      fi
      touch ${CACHEDIR}/${i}
      rm -f ${CACHEDIR}/${i}.temp
      wget ${PROTOCOL}://${HOST}/admin/slavedns.php --http-passwd ${LOGIN} --http-user ${PASSWORD} -o ${CACHEDIR}/${i}.temp -t 1 -T 5 2>/dev/null
      if [ -s "${CACHEDIR}/${i}.temp" ]
          then
          # If the slave file has changed, synchronize it.
          if diff ${CACHEDIR}/${i}.temp ${CACHEDIR}/${i} -q &>/dev/null
              then
              echo "Change detected for '$i', applying"
              cp -f ${CACHEDIR}/${i}.temp ${CACHEDIR}/${i}
              # Now parse the slave file and send it to /etc/bind/slavedns
              CreateBindConf ${i} ${HOST}
              RELOAD="YES"
              fi
          else
          echo "Error: downloaded file for '$i' has zero size"
          fi
      echo " Done"
  fi
done     # Main loop on config files

if [ "$RELOAD" ]
then
    if [ -e "/etc/init.d/bind" ]
        then
        /etc/init.d/bind reload
        fi
    if [ -e "/etc/init.d/bind9" ]
        then
        /etc/init.d/bind9 reload
        fi
fi