# !/bin/bash


aliddnsipv6_ak="换成你阿里去AccessKdy的ID"  #换成你阿里去AccessKdy的ID
aliddnsipv6_sk="换成你阿里云AccessKey的密码"  #换成你阿里云AccessKey的密码
aliddnsipv6_name1='test'  #换成你的二级域名（随便填，自已记住就行）
aliddnsipv6_domain='domain.com'  #换成你在阿里云注册的域名
aliddnsipv6_ttl="600"

if [ "$aliddnsipv6_name1" = "@" ]
then
  aliddnsipv6_name=$aliddnsipv6_domain
else
  aliddnsipv6_name=$aliddnsipv6_name1.$aliddnsipv6_domain
fi

now=`date`

die () {
    echo $1
}

ipv6s=`ip addr show ovs_eth0 | grep "inet6.*global" | awk '{print $2}' | awk -F"/" '{print $1}'` || die "$ipv6"

for ipv6 in $ipv6s
do
  #ipv6 = $ipv6
  break
done

echo $ipv6

current_ipv6=`nslookup -query=AAAA $aliddnsipv6_name 2>&1`
#echo $current_ipv6

current_ipv6=`echo "$current_ipv6" | grep 'Address: ' | tail -n1 | awk '{print $NF}'`
echo $current_ipv6

if [ "$?" -eq "0" ]
then
    current_ipv6=`echo "$current_ipv6" | grep 'Address: ' | tail -n1 | awk '{print $NF}'`
    echo $current_ipv6

    if [ "$ipv6" = "$current_ipv6" ]
    then
        echo "skipping"
    fi
# fix when A record removed by manual dns is always update error
else
    unset aliddnsipv6_record_id
fi


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


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 args="AccessKeyId=$aliddnsipv6_ak&Action=$1&Format=json&$2&Version=2015-01-09"
    local hash=$(echo -n "GET&%2F&$(enc "$args")" | openssl dgst -sha1 -hmac "$aliddnsipv6_sk&" -binary | openssl base64)
    curl -s "http://alidns.aliyuncs.com/?$args&Signature=$(enc "$hash")"
}

get_recordid() {
    grep -Eo '"RecordId":"[0-9]+"' | cut -d':' -f2 | tr -d '"'
}

query_recordid() {
    send_request "DescribeSubDomainRecords" "SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&SubDomain=$aliddnsipv6_name&Timestamp=$timestamp&Type=AAAA"
}

update_record() {
    send_request "UpdateDomainRecord" "RR=$aliddnsipv6_name1&RecordId=$1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=$aliddnsipv6_ttl&Timestamp=$timestamp&Type=AAAA&Value=$(enc $ipv6)"
}

add_record() {
    send_request "AddDomainRecord&DomainName=$aliddnsipv6_domain" "RR=$aliddnsipv6_name1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=$aliddnsipv6_ttl&Timestamp=$timestamp&Type=AAAA&Value=$(enc $ipv6)"
}

#add support */%2A and @/%40 record


if [ "$aliddnsipv6_record_id" = "" ]
then
    aliddnsipv6_record_id=`query_recordid | get_recordid`
    #echo '-----------------' $aliddnsipv6_record_id
fi
if [ "$aliddnsipv6_record_id" = "" ]
then
    aliddnsipv6_record_id=`add_record | get_recordid`
    echo "added record $aliddnsipv6_record_id"
else
    update_record $aliddnsipv6_record_id
    echo "updated record $aliddnsipv6_record_id"
fi