aliyun_ddns.sh

aliddns_ak="xxx"
aliddns_sk="xxx"
domain="xxx.example.com"

timestamp=$(date -u "+%Y-%m-%dT%H%%3A%M%%3A%SZ")

ip=$(ip route get 2001::8888 | sed -n '/src/{s/.*src *\([^ ]*\).*/\1/p;q}')

urlencode() {
    # urlencode <string>
    out=""
    while read -n1 c
    do
        case $c in
            [a-zA-Z0-9._-]) out="$out$c" ;;
            *) out="$out$(printf '%%%02X' "'$c")" ;;
        esac
    done
    echo -n "$out"
}

enc() {
    echo -n "$1" | urlencode
}

send_request() {
    local hash=$(echo -n "GET&%2F&$(enc "$1")" | openssl dgst -sha1 -hmac "$aliddns_sk&" -binary | openssl base64)
    curl -s "https://alidns.aliyuncs.com/?$1&Signature=$(enc "$hash")"
}

DescribeSubDomainRecords() {
    send_request "AccessKeyId=$aliddns_ak&Action=DescribeSubDomainRecords&Format=json&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&SubDomain=$1&Timestamp=$timestamp&Version=2015-01-09"
}

UpdateDomainRecord() {
    # args: RecordID RR TTL Type Value
    send_request "AccessKeyId=$aliddns_ak&Action=UpdateDomainRecord&Format=json&RR=$2&RecordId=$1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=$3&Timestamp=$timestamp&Type=$4&Value=$5&Version=2015-01-09"
}

PushMsg() {
    echo "Push: $1"
    curl -s --get --data-urlencode "msg=$1" "https://server.lyc8503.site/wepush?key=wepushkey"
}

records=$(DescribeSubDomainRecords "$domain")

echo "List subdomain:"
echo "$records" | jq

if [ $(echo "$records" | jq ".TotalCount") != "1" ] ; then
    echo "Record count != 1, please make sure there's EXACTLY one record, exiting..."
    exit 1
fi

remote_ip=$(echo "$records" | jq -r ".DomainRecords.Record[0].Value")

echo "Local ip: $ip"
echo "Remote ip: $remote_ip"

if [ "$remote_ip" == "$ip" ] ; then
    echo "No ip change, pass."
    exit 0
fi

target_record=$(echo "$records" | jq -r ".DomainRecords.Record[0]")

result=$(UpdateDomainRecord $(echo "$target_record" | jq -r ".RecordId") $(echo "$target_record" | jq -r ".RR") $(echo "$target_record" | jq -r ".TTL") $(echo "$target_record" | jq -r ".Type") $(enc "$ip"))

echo "Result:"
echo "$result" | jq

if [ $(echo "$result" | jq -r ".RecordId") != $(echo "$target_record" | jq -r ".RecordId") ] ; then
    PushMsg "[AliDDNS] 域名 $domain IP 更新**失败**: $result"
    exit 1
fi

PushMsg "[AliDDNS] 域名 $domain IP 更新成功: $ip"