#!/bin/sh
aliddns_name="ÓòÃûǰ׺test"
aliddns_domain="ÓòÃûclicksun.cn"
aliddns_ak="AccessKeyId***************"
aliddns_sk="AccessKeySecret***************"
 
aliddns_curl="curl -s whatismyip.akamai.com"
aliddns_dns="8.8.8.8"
aliddns_ttl="600"
 
ip=`$aliddns_curl 2>&1`
 
current_ip=`nslookup $aliddns_name.$aliddns_domain $aliddns_dns 2>&1`
 
if [ "$?" -eq "0" ]
then
    current_ip=`echo "$current_ip" | grep 'Address 1' | tail -n1 | awk '{print $NF}'`
    if [ "$ip" = "$current_ip" ]
    then
        exit 0
    fi 
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 "$1" | urlencode
}
send_request() {
    local args="AccessKeyId=$aliddns_ak&Action=$1&Format=json&$2&Version=2015-01-09"
    local hash=$(echo -n "GET&%2F&$(enc "$args")" | openssl dgst -sha1 -hmac "$aliddns_sk&" -binary | openssl base64)
    curl -s "http://alidns.aliyuncs.com/?$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=$timestamp&SignatureVersion=1.0&SubDomain=$aliddns_name.$aliddns_domain&Timestamp=$timestamp"
}
update_record() {
    send_request "UpdateDomainRecord" "RR=$aliddns_name&RecordId=$1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=$aliddns_ttl&Timestamp=$timestamp&Type=A&Value=$ip"
}
add_record() {
    send_request "AddDomainRecord&DomainName=$aliddns_domain" "RR=$aliddns_name&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=$aliddns_ttl&Timestamp=$timestamp&Type=A&Value=$ip"
}
if [ "$aliddns_record_id" = "" ]
then
    aliddns_record_id=`query_recordid | get_recordid`
fi
if [ "$aliddns_record_id" = "" ]
then
    aliddns_record_id=`add_record | get_recordid`
    echo "added record $aliddns_record_id"
else
    update_record $aliddns_record_id
    echo "updated record $aliddns_record_id"
fi