Hurricane Electric DNS Hook script for Dehydrated and Let's Encrypt

he_dns.sh

#!/bin/bash
### salvaged from some forum and patched by me

url=https://dns.he.net/

# These should be set in .hedns-credentials
login=
password=
zoneid=
# Optionally override these.
ttl=300

if [ -e ${HOME}/.hedns-credentials ]; then
    . ${HOME}/.hedns-credentials
fi

if [[ "z$password" = "z" ]]; then
    echo 'enter password'
    read -s password
    echo 'thanks, working...'
fi

function usage()
{
    prog=$(basename $0)
    cat <<EOF
Create/update:
 $prog NAME TYPE CONTENT [TTL]
Delete:
 $prog NAME "DELETE"
EOF
}

record=$1
type=$2
content=$3
usettl=${4-${ttl}}

if [ $# -lt 2 ] || [ $# -lt 3 -a "${type}" != DELETE ]; then
    usage
    exit 1
fi

cookies=${HOME}/.hedns-cookies.txt
touch ${cookies}
chmod 0600 ${cookies}

function get_id()
{
    curl -sS --cookie ${cookies} "${url}?hosted_dns_zoneid=${zoneid}&menu=edit_zone&hosted_dns_editzone" | grep -B5 ">${record}" | sed -nre 's/.*dns_tr.* id="([^"]*)".*/\1/p' | head -n 1
}

# Get any initial cookies.
curl -sS --cookie-jar ${cookies} ${url} -o /dev/null
# Login.
curl -sS --cookie ${cookies} --cookie-jar ${cookies} --data "email=${login}&pass=${password}&submit=Login%21" ${url} -o /dev/null

# Check if we should update or create new.
recordid=$(get_id)
if [ "${type}" == DELETE ]; then
    if [ ! "${recordid}" ]; then
	echo "No such record"
	exit 1
    fi
    curl -sS --cookie ${cookies} --data "menu=edit_zone&hosted_dns_zoneid=${zoneid}&hosted_dns_recordid=${recordid}&hosted_dns_editzone=1&hosted_dns_delrecord=1" "${url}index.cgi" | grep "^${record}"
    [ $? -ne 0 ]
    exit
fi
if [ "${recordid}" ]; then
    op=Update
else
    op=Submit
fi
curl -sS --cookie ${cookies} --data "account=&menu=edit_zone&Type=${type}&hosted_dns_zoneid=${zoneid}&hosted_dns_recordid=${recordid}&hosted_dns_editzone=1&Priority=&Name=${record}&Content=${content}&TTL=${usettl}&hosted_dns_editrecord=${op}" "${url}?hosted_dns_zoneid=${zoneid}&menu=edit_zone&hosted_dns_editzone" | grep "^${record}"