aliddns.sh

#!/bin/sh

set -e

aliddns_ak="TODO"                     # 你的阿里云 appkey
aliddns_sk="TODO"                     # 你的阿里云 appsecret
aliddns_curl="curl -s whatismyip.akamai.com" # 获取当前公网 IP 的命令，如果不好用可以尝试别的方式
aliddns_dns="223.5.5.5"               # 阿里云 DNS 服务器，直接从这个服务器进行查询可以避免 DNS 缓存
aliddns_ttl="600"                     # DNS 的 TTL 时间，免费版最低是 600s
aliddns_domain="kyrios.site"          # 你的域名
aliddns_name="@"                      # DNS 三级域名，@ 表示没有三级域名
aliddns_record_id="18313508395238400" # record id，可以留空。为了提高效率，可以在首次运行后，将 record_id 保存下来

if [[ $aliddns_name = "@" ]]; then
    aliddns_fullname=$aliddns_domain
else
    aliddns_fullname="$aliddns_name.$aliddns_domain"
fi

ip=`$aliddns_curl 2>&1`

current_ip=`nslookup $aliddns_fullname $aliddns_dns 2>&1 | grep 'Address' | tail -n1 | awk '{print $NF}'`

if [ "$ip" = "$current_ip" ]
then
    echo "skipping"
    exit 0
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
}

aliddns_name=`enc $aliddns_name`

send_request() {
    local args="AccessKeyId=$aliddns_ak&Action=$1&Format=json&$2&Version=2015-01-09"
    local hash=$(printf "%s" "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]+"' | head -n1 | cut -d'"' -f4
}

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