为梅林系统路由配置使用阿里dns的ddns

All credits goes to kyrios@Koolshare

---

之前一直在使用NameCheap的dns服务,丫自带ddns
这周历尽千辛万苦的备案终于搞定了,就想把解析放到国内来实现隐形跳转...
但是这就没办法使用原来的ddns了...
在Koolshare梅林的软件中心中发现了aliddns的插件...
但是我觉得ddns脚本这种东西,每次wan状态发生变化的时候运行一下就够了,没有必要隔几分钟跑一次...
所以就将kyrios的脚本稍作改写
自己加了@和*的处理,用于根域名解析和泛解析...虽然很少有人这么用...

#!/bin/sh

# configuration
AccessKeyID=XXXXXXXXXXX
AccessKeySecret=XXXXXXXXXXX
Host=ddns
Domain=example.tld

# Should be no need to modify anything beyond this point
timestamp=`date -u "+%Y-%m-%dT%H%%3A%M%%3A%SZ"`
ip=$(curl -s whatismyip.akamai.com)

urlencode() {
    out=""
    while read -n1 c
    do
        case $c in
            [a-zA-Z0-9._-]) out="$out$c" ;;
            *) out="$out`printf '%%%02X' "$c"`" ;;
            # 此行正确应为 *) out="$out`printf '%%%02X' "'$c"`" ;;
            # 但是如果加上那个单引号,博客的语法高亮会崩...蛋疼
        esac
    done
    echo -n $out
}

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

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

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

query_recordid() {
    if [ "$Host" = "@" ]
    then
        send_request "DescribeSubDomainRecords" "SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&SubDomain=$Domain&Timestamp=$timestamp&Type=A"
    elif [ "$Host" = "*" ]
    then
        send_request "DescribeSubDomainRecords" "SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&SubDomain=%2A.$Domain&Timestamp=$timestamp&Type=A"
    else
        send_request "DescribeSubDomainRecords" "SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&SubDomain=$Host.$Domain&Timestamp=$timestamp&Type=A"
    fi
}

update_record() {
    if [ "$Host" = "@" ]
    then
        send_request "UpdateDomainRecord" "RR=%40&RecordId=$1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=600&Timestamp=$timestamp&Type=A&Value=$ip"
    elif [ "$Host" = "*" ]
    then
        send_request "UpdateDomainRecord" "RR=%2A&RecordId=$1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=600&Timestamp=$timestamp&Type=A&Value=$ip"        
    else
        send_request "UpdateDomainRecord" "RR=$Host&RecordId=$1&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=600&Timestamp=$timestamp&Type=A&Value=$ip"
    fi
}

add_record() {
    if [ "$Host" = "@" ]
    then
        send_request "AddDomainRecord&DomainName=$Domain" "RR=%40&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=600&Timestamp=$timestamp&Type=A&Value=$ip"
    elif [ "$Host" = "*" ]
    then
        send_request "AddDomainRecord&DomainName=$Domain" "RR=%2A&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=600&Timestamp=$timestamp&Type=A&Value=$ip"    
    else
        send_request "AddDomainRecord&DomainName=$Domain" "RR=$Host&SignatureMethod=HMAC-SHA1&SignatureNonce=$timestamp&SignatureVersion=1.0&TTL=600&Timestamp=$timestamp&Type=A&Value=$ip"        
    fi
}

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`
else
    update_record $aliddns_record_id
fi

if [ $? -eq 0 ]; then
  /sbin/ddns_custom_updated 1
else
  /sbin/ddns_custom_updated 0
fi

---

将configuration部分填好,保存为/jffs/scripts/ddns-start,给0755权限
在路由web界面的外部网络-DDNS设置页中,选择Custom
应用即可