pure shell dnspod ddns client

ddns.sh

#!/bin/sh
HOST=https://dnsapi.cn
USERAGENT='DNSPOD DDNS Client/1.0.0 ([email protected])'

if [ -n "$(which wget)" ];then
    CMD=wget
fi
if [ -n "$(which curl)" ];then
    CMD=curl
fi

if [ -z "${CMD}" ];then
    echo need curl or wget!
    exit 1
fi

current_ip() {
    local URL=http://greak.net/ip
    case "${CMD}" in
        curl)
            curl --silent ${URL}
            ;;
        wget)
            wget --quiet --no-check-certificate --output-document=- ${URL}
            ;;
    esac
}

echo use: ${CMD}

NEW_IP=$(current_ip)
if [ -z "${NEW_IP}" ];then
    echo could not get current wan ip.
    exit
fi

echo WAN ip: ${NEW_IP}

post() {
    URL=$1
    DATA=$2
    case "${CMD}" in
        curl)
            curl --silent -X POST ${HOST}${URL} -d "login_token=${TOKEN}&format=json&${DATA}"
            ;;
        wget)
            wget --quiet --no-check-certificate --output-document=- --post-data "login_token=${TOKEN}&format=json&${DATA}" ${HOST}${URL}
            ;;
    esac
}

update_ddns() {
    DOMAIN=$1
    SUB_DOMAIN=$2


    echo "${SUB_DOMAIN}.${DOMAIN} -> ${NEW_IP}"

    DOMAIN_ID=$(post '/Domain.Info' "domain=${DOMAIN}" | sed 's/.*"id":"\([0-9]*\)".*/\1/')
    #echo domain id: ${DOMAIN_ID}

    RECORD=$(post '/Record.List' "domain_id=${DOMAIN_ID}&sub_domain=${SUB_DOMAIN}")
    CODE=$(echo ${RECORD} | sed 's/.*"code":"\([0-9]*\)".*/\1/')

    if [ "${CODE}" = "10" ];then
        echo create new record
        post '/Record.Create' "domain_id=${DOMAIN_ID}&sub_domain=${SUB_DOMAIN}&value=127.0.0.1&record_type=A&record_line=默认"
        RECORD=$(post '/Record.List' "domain_id=${DOMAIN_ID}&sub_domain=${SUB_DOMAIN}")
    fi

    RECORD_ID=$(echo ${RECORD} | sed 's/.*\[[^]]*"id":"\([0-9]*\)".*/\1/')
    #echo record id: ${RECORD_ID}

    OLD_IP=$(echo ${RECORD} | sed 's/.*\[[^]]*"value":"\([0-9.]*\)".*/\1/')
    echo old ip: ${OLD_IP}

    if [ "${NEW_IP}" = "${OLD_IP}" ];then
        echo skip
    else
        post '/Record.Ddns' "domain_id=${DOMAIN_ID}&record_id=${RECORD_ID}&sub_domain=${SUB_DOMAIN}&value=${NEW_IP}&record_line=默认"
    fi
}

TOKEN="12345,1234567890abcdef"
update_ddns 'example-domain.com' 'subdomain'