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#!/bin/bash
### route53.sh
### For use in LEDE / OpenWRT DDNS scenarios
###
### Requires: curl, openssl-util
set -euo pipefail
IFS=$'\n\t'
ENDPOINT="route53.amazonaws.com"
RECORD_TTL=300
RECORD_NAME=""
RECORD_TYPE="A"
RECORD_VALUE="1.2.3.4"
HOSTED_ZONE_ID=""
PATH="/2013-04-01/hostedzone/${HOSTED_ZONE_ID}/rrset/"
AWS_ACCESS_KEY_ID=''
AWS_SECRET_ACCESS_KEY=''
AWS_REGION='us-east-1'
AWS_SERVICE='route53domains'
date=`date +%Y%m%d`
request_body=$(cat <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<ChangeResourceRecordSetsRequest xmlns="https://route53.amazonaws.com/doc/2013-04-01/">
<ChangeBatch>
<Changes>
<Change>
<Action>UPSERT</Action>
<ResourceRecordSet>
<Name>${RECORD_NAME}</Name>
<Type>${RECORD_TYPE}</Type>
<TTL>${RECORD_TTL}</TTL>
<ResourceRecords>
<ResourceRecord>
<Value>${RECORD_VALUE}</Value>
</ResourceRecord>
</ResourceRecords>
</ResourceRecordSet>
</Change>
</Changes>
</ChangeBatch>
</ChangeResourceRecordSetsRequest>
EOF
)
canonical_request="POST\n${PATH}\n\nhost:route53.amazon.com\nx-amz-date:`date -Iseconds`\n\nhost;x-amz-date"
sign() {
key=$1
msg=$2
echo -n $msg | openssl dgst -sha256 -hmac $key | sed 's/^.* //'
}
getSignatureKey() {
# usage: getSignatureKey date region service
date_key=$(sign AWS4${AWS_SECRET_ACCESS_KEY_ID} ${date})
region_key=$(sign $date_key $AWS_REGION)
service_key=$(sign $region_key $AWS_SERVICE)
signing_key=$(sign $service_key aws4_request)
echo -n $signing_key
}
amzdate=`date -Iseconds`
credential="${AWS_ACCESS_KEY_ID}/${date}/${AWS_REGION}/${AWS_SERVICE}/aws4_request"
signed_headers="host;x-amz-date"
signature=""
authorization="AWS4-HMAC-SHA256 Credential=${credential},SignedHeaders=${signed_headers},Signature=${signature}"
curl \
-H "x-amz-date=`date -Iseconds`" \
-H "Authorization=${authorization}}"
"https://${ENDPOINT}"
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