update-ddns.sh

#! /bin/sh -xe

IP=`curl https://ipinfo.io/ip 2> /dev/null`
EMAIL="hie@natto"
TOKEN="huehuehuehue"
LOG=
PTRS=

changed() {
  DOMAIN=$1
  PTRS=`nslookup $1 | sed -ne 's/Address: //p'`
  [ $IP != $PTRS ]
}

update() {
  ZONE=$1
  RECORD=$2
  DOMAIN=$3
  if `changed $3`; then
    echo "Address Changed! from $PTRS to $IP" >&2
    LOG=`curl -X PUT -H "Content-Type: application/json" -H "X-Auth-Email: ${EMAIL}" \
      -H "X-Auth-Key: ${TOKEN}" \
      https://api.cloudflare.com/client/v4/zones/${ZONE}/dns_records/${RECORD} \
      --data "{\"zone_id\": \"${ZONE}\", \"type\": \"A\", \"name\": \"${DOMAIN}\", \"content\": \"${IP}\"}"`
  else
    echo "Address not Changed." >&2
  fi
}

update "tatata" "sanukimiko" "mikan.nina.xxx"

if [ "x$LOG" != "x" ]; then
  TEMP=`mktemp`
  echo "From: Update DDNS log <update-ddns-log@ushio.nna774.net>" > "$TEMP"
  echo "To: update-ddns@localhost" >> "$TEMP"
  echo "Subject: Update DDNS log" >> "$TEMP"
  echo >> "$TEMP"
  echo "$LOG" | jq . >> "$TEMP"
  sendmail "update-ddns@localhost" < "$TEMP"
  rm -f "$TEMP"
fi

update-dns.service

[Unit]
Description = update dns

[Service]
ExecStart = /home/nona/.dotfiles/bin/update-ddns.sh
Type = oneshot
User = nobody

[Install]
WantedBy = multi-user.target

update-dns.timer

[Unit]
Description=update dns

[Timer]
OnBootSec=5min
OnUnitActiveSec=1h

[Install]
WantedBy=timers.target