keyakko/dns_check.zsh

## dns_check.zsh
#!/usr/bin/env zsh

TARGET_DOMAIN_NAME=
TARGET_RECORD=A
ROOT_SERVERS=`echo {a..m}.root-servers.net`

local -A opthash
zparseopts -D -M -A opthash -- \
  h -help=h \
  -root: \
  -record:

if [[ -n "${opthash[(i)-h]}" ]]; then
  echo "dns check"
  echo $0 "[OPTION]..." "[TARGET_DOMAIN_NAME]"
  echo
  echo "[option]"
  echo "--help      show help"
  echo "--root      set DNS root-server"
  echo "--record    set target record type"
  return 0
fi

if [[ -z "$@" ]]; then
  echo "target is empty."
  return 1
fi

TARGET_DOMAIN_NAME=`echo -n $@ | awk '{print $1}'`

if [[ -n "${opthash[(i)--root]}" ]]; then
  ROOT_SERVERS=${opthash[--root]}
fi

if [[ -n "${opthash[(i)--record]}" ]]; then
  TARGET_RECORD=${opthash[--record]}
fi

BASE_SEARCH_RESULT=
DNS_SERVERS=$ROOT_SERVERS
NEXT_TARGET_DNS_SERVER=
while true; do
  BASE_SEARCH_RESULT=
  NEXT_TARGET_DNS_SERVER=

  # empty check
  if [[ -z $DNS_SERVERS ]]; then break; fi

  echo -n $DNS_SERVERS | \
  tr ' ' '\n' | \
  while read DNS_SV; do
    SEARCH_RESULT=`dig @${DNS_SV} ${TARGET_DOMAIN_NAME} ${TARGET_RECORD} +norecurse | grep -E "[0-9].*IN.*(NS|${TARGET_RECORD})"`

    # show result
    echo "++++++++++" $DNS_SV "++++++++++"
    echo $SEARCH_RESULT
    echo "++++++++++++++++++++++++++++++++++++++++++++++++++"

    if [[ -z $BASE_SEARCH_RESULT ]]; then
      BASE_SEARCH_RESULT=$SEARCH_RESULT
      echo $SEARCH_RESULT | grep $TARGET_DOMAIN_NAME 2>/dev/null | grep $TARGET_RECORD 2>&1 1>/dev/null
      if [[ $? -ne 0 ]]; then
        NEXT_TARGET_DNS_SERVER=`echo $SEARCH_RESULT | grep NS | awk '{print $5}' | tr '\n' ' '`
      fi

    else
      echo $SEARCH_RESULT | \
      awk '{print $5}' | \
      while read SV_VAL; do
        echo $BASE_SEARCH_RESULT | grep $SV_VAL 2>&1 1>/dev/null
        if [[ $? -ne 0 ]]; then
          echo "check failed!" "sv: " $DNS_SV ", value: "$SV_VAL
        fi
      done
    fi
  done
  DNS_SERVERS=$NEXT_TARGET_DNS_SERVER

done
	#!/usr/bin/env zsh

	TARGET_DOMAIN_NAME=
	TARGET_RECORD=A
	ROOT_SERVERS=`echo {a..m}.root-servers.net`

	local -A opthash
	zparseopts -D -M -A opthash -- \
	h -help=h \
	-root: \
	-record:

	if [[ -n "${opthash[(i)-h]}" ]]; then
	echo "dns check"
	echo $0 "[OPTION]..." "[TARGET_DOMAIN_NAME]"
	echo
	echo "[option]"
	echo "--help show help"
	echo "--root set DNS root-server"
	echo "--record set target record type"
	return 0
	fi

	if [[ -z "$@" ]]; then
	echo "target is empty."
	return 1
	fi

	TARGET_DOMAIN_NAME=`echo -n $@ \| awk '{print $1}'`

	if [[ -n "${opthash[(i)--root]}" ]]; then
	ROOT_SERVERS=${opthash[--root]}
	fi

	if [[ -n "${opthash[(i)--record]}" ]]; then
	TARGET_RECORD=${opthash[--record]}
	fi

	BASE_SEARCH_RESULT=
	DNS_SERVERS=$ROOT_SERVERS
	NEXT_TARGET_DNS_SERVER=
	while true; do
	BASE_SEARCH_RESULT=
	NEXT_TARGET_DNS_SERVER=

	# empty check
	if [[ -z $DNS_SERVERS ]]; then break; fi

	echo -n $DNS_SERVERS \| \
	tr ' ' '\n' \| \
	while read DNS_SV; do
	SEARCH_RESULT=`dig @${DNS_SV} ${TARGET_DOMAIN_NAME} ${TARGET_RECORD} +norecurse \| grep -E "[0-9].IN.(NS\|${TARGET_RECORD})"`

	# show result
	echo "++++++++++" $DNS_SV "++++++++++"
	echo $SEARCH_RESULT
	echo "++++++++++++++++++++++++++++++++++++++++++++++++++"

	if [[ -z $BASE_SEARCH_RESULT ]]; then
	BASE_SEARCH_RESULT=$SEARCH_RESULT
	echo $SEARCH_RESULT \| grep $TARGET_DOMAIN_NAME 2>/dev/null \| grep $TARGET_RECORD 2>&1 1>/dev/null
	if [[ $? -ne 0 ]]; then
	NEXT_TARGET_DNS_SERVER=`echo $SEARCH_RESULT \| grep NS \| awk '{print $5}' \| tr '\n' ' '`
	fi

	else
	echo $SEARCH_RESULT \| \
	awk '{print $5}' \| \
	while read SV_VAL; do
	echo $BASE_SEARCH_RESULT \| grep $SV_VAL 2>&1 1>/dev/null
	if [[ $? -ne 0 ]]; then
	echo "check failed!" "sv: " $DNS_SV ", value: "$SV_VAL
	fi
	done
	fi
	done
	DNS_SERVERS=$NEXT_TARGET_DNS_SERVER

	done