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cobusbernard/update-route53.sh

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Revisions

  1. cobusbernard revised this gist Feb 27, 2015. 1 changed file with 67 additions and 32 deletions.
    99 changes: 67 additions & 32 deletions update-route53.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -2,11 +2,41 @@

    # Copied from http://willwarren.com/2014/07/03/roll-dynamic-dns-service-using-amazon-route53/

    # Externalizing the zone ID and CNAME
    if [ -z "$1" ]
    then
    echo "The first argument needs to be the Hosted Zone ID, i.e. BJBK35SKMM9OE"
    exit 1
    fi

    if [ -z "$2" ]
    then
    echo "The second argument needs to be CNAME to update, i.e. example.com"
    exit 1
    fi

    if [ -z "$3" ]
    then
    echo "The third argument needs to be AWS IAM role that has access to this domain, i.e. your-dns-updater"
    exit 1
    fi


    # Hosted Zone ID e.g. BJBK35SKMM9OE
    ZONEID="enter zone id here"
    ZONEID=$1

    # The CNAME you want to update e.g. hello.example.com
    RECORDSET="enter cname here"
    RECORDSET=$2

    # The IAM user profile to use
    IAM_PROFILE=$3

    # Force the update
    if [ $4 = "1" ];
    then
    echo "Force update is set."
    FORCE_UPDATE=1
    fi

    # More advanced options below
    # The Time-To-Live of this recordset
    @@ -49,47 +79,52 @@ fi
    # Check if the IP has changed
    if [ ! -f "$IPFILE" ]
    then
    touch "$IPFILE"
    touch "$IPFILE"
    fi

    if grep -Fxq "$IP" "$IPFILE"; then
    # code if found
    echo "IP is still $IP. Exiting" >> "$LOGFILE"
    exit 0
    else
    echo "IP has changed to $IP" >> "$LOGFILE"
    # Fill a temp file with valid JSON
    TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX)
    cat > ${TMPFILE} << EOF
    if [ -z "$FORCE_UPDATE" ]; then
    echo "Exiting..."
    exit 0
    fi
    fi

    echo "IP has changed to $IP, updating ..."
    echo "IP has changed to $IP" >> "$LOGFILE"
    # Fill a temp file with valid JSON
    TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX)
    cat > ${TMPFILE} << EOF
    {
    "Comment":"$COMMENT",
    "Changes":[
    {
    "Comment":"$COMMENT",
    "Changes":[
    {
    "Action":"UPSERT",
    "ResourceRecordSet":{
    "ResourceRecords":[
    {
    "Value":"$IP"
    }
    ],
    "Name":"$RECORDSET",
    "Type":"$TYPE",
    "TTL":$TTL
    "Action":"UPSERT",
    "ResourceRecordSet":{
    "ResourceRecords":[
    {
    "Value":"$IP"
    }
    }
    ]
    ],
    "Name":"$RECORDSET",
    "Type":"$TYPE",
    "TTL":$TTL
    }
    }
    ]
    }
    EOF

    # Update the Hosted Zone record
    aws route53 change-resource-record-sets \
    --hosted-zone-id $ZONEID \
    --change-batch file://"$TMPFILE" >> "$LOGFILE"
    echo "" >> "$LOGFILE"
    # Update the Hosted Zone record
    aws route53 change-resource-record-sets \
    --profile $IAM_PROFILE \
    --hosted-zone-id $ZONEID \
    --change-batch file://"$TMPFILE" >> "$LOGFILE"
    echo "" >> "$LOGFILE"

    # Clean up
    rm $TMPFILE
    fi
    # Clean up
    rm $TMPFILE

    # All Done - cache the IP address for next time
    echo "$IP" > "$IPFILE"
  2. cobusbernard revised this gist Feb 27, 2015. 1 changed file with 2 additions and 0 deletions.
    2 changes: 2 additions & 0 deletions update-route53.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -1,5 +1,7 @@
    #!/bin/bash

    # Copied from http://willwarren.com/2014/07/03/roll-dynamic-dns-service-using-amazon-route53/

    # Hosted Zone ID e.g. BJBK35SKMM9OE
    ZONEID="enter zone id here"

  3. cobusbernard revised this gist Feb 27, 2015. No changes.
  4. cobusbernard created this gist Feb 27, 2015.
    93 changes: 93 additions & 0 deletions update-route53.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,93 @@
    #!/bin/bash

    # Hosted Zone ID e.g. BJBK35SKMM9OE
    ZONEID="enter zone id here"

    # The CNAME you want to update e.g. hello.example.com
    RECORDSET="enter cname here"

    # More advanced options below
    # The Time-To-Live of this recordset
    TTL=300
    # Change this if you want
    COMMENT="Auto updating @ `date`"
    # Change to AAAA if using an IPv6 address
    TYPE="A"

    # Get the external IP address
    IP=`curl -sSk https://wtfismyip.com/text`

    function valid_ip()
    {
    local ip=$1
    local stat=1

    if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
    OIFS=$IFS
    IFS='.'
    ip=($ip)
    IFS=$OIFS
    [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
    && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
    stat=$?
    fi
    return $stat
    }

    # Get current dir (stolen from http://stackoverflow.com/a/246128/920350)
    DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
    LOGFILE="$DIR/update-route53.log"
    IPFILE="$DIR/update-route53.ip"

    if ! valid_ip $IP; then
    echo "Invalid IP address: $IP" >> "$LOGFILE"
    exit 1
    fi

    # Check if the IP has changed
    if [ ! -f "$IPFILE" ]
    then
    touch "$IPFILE"
    fi

    if grep -Fxq "$IP" "$IPFILE"; then
    # code if found
    echo "IP is still $IP. Exiting" >> "$LOGFILE"
    exit 0
    else
    echo "IP has changed to $IP" >> "$LOGFILE"
    # Fill a temp file with valid JSON
    TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX)
    cat > ${TMPFILE} << EOF
    {
    "Comment":"$COMMENT",
    "Changes":[
    {
    "Action":"UPSERT",
    "ResourceRecordSet":{
    "ResourceRecords":[
    {
    "Value":"$IP"
    }
    ],
    "Name":"$RECORDSET",
    "Type":"$TYPE",
    "TTL":$TTL
    }
    }
    ]
    }
    EOF

    # Update the Hosted Zone record
    aws route53 change-resource-record-sets \
    --hosted-zone-id $ZONEID \
    --change-batch file://"$TMPFILE" >> "$LOGFILE"
    echo "" >> "$LOGFILE"

    # Clean up
    rm $TMPFILE
    fi

    # All Done - cache the IP address for next time
    echo "$IP" > "$IPFILE"