应他人要求，想要一个检查域名更新的小脚本，所以在此记录一下
1 、前言
域名的 IP 总是变，没事就会变个新的，但是 IP 变化了有些软件就掉线了。
所以需要一个去根据域名解析变化而去对本地配置文件操作的方法
2 、准备
准备工具
无
前提要素
dig 已安装
3 、 DDNS 获取新 IP 地址 Shell 脚本
下载地址：[ 链接 ]
#!/usr/bin/env bash PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin export PATH # # Dynamic Domain Name Server (Cloudflare API) # # Author: StarryVoid <[email protected]> # Intro: https://blog.starryvoid.com/archives/434.html # # -------------- Config Start ------------ # Log OUTPUTLOG="$(pwd)/shell.log" # -------------- Config End ------------ # Time DATETIME=$(date +%Y-%m-%d_%H:%M:%S) RUNTIME=$(date +%s) INPUTCONFIG="$1" USESHELL="$2" # ------------ Start ------------ check_environment () { if ! [ -x "$(command -v dig)" ]; then echo "Command not found \"dig\"" >> "${OUTPUTLOG}" ; exit 1; fi } read_config_info_file() { CONFIGFILE=$(echo "${INPUTCONFIG}" | grep "\-\-config=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [ -f "$(pwd)/${CONFIGFILE}" ]; then CONFIGINFO="$(pwd)/${CONFIGFILE}" elif [ -f "${CONFIGFILE}" ]; then CONFIGINFO="${CONFIGFILE}" else echo " Please Input Config File as \"--config=\" to Running Shell " echo " Example Config File Will Print for \"$(pwd)/config.example\" " echo -e "DOMAINNAME=\"example.com\"\nDOMAINIPVERSION=\"4\"\nDIGQUERYSERVER=\"8.8.8.8\"\nDIGQUERYTIME=\"5\"\nOLDIPADDRESS=\"1.0.1.0\"\nOLDTIME=\"1000000000\"\nOLDTTL=\"300\"\n" > "$(pwd)/config.example" fi if [ -f "${CONFIGINFO}" ]; then CHECKDDNSINFOFILE=1 DOMAINNAME=$(cat < "${CONFIGINFO}" | grep "DOMAINNAME=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ ! "${DOMAINNAME}" ]]; then CHECKDDNSINFOFILE=0 ; fi DOMAINIPVERSION=$(cat < "${CONFIGINFO}" | grep "DOMAINIPVERSION=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ "${DOMAINIPVERSION}" != "4" ]] && [[ "${DOMAINIPVERSION}" != "6" ]]; then CHECKDDNSINFOFILE=0 ; fi DIGQUERYSERVER=$(cat < "${CONFIGINFO}" | grep "DIGQUERYSERVER=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ ! "${DIGQUERYSERVER}" ]]; then CHECKDDNSINFOFILE=0 ; fi DIGQUERYTIME=$(cat < "${CONFIGINFO}" | grep "DIGQUERYTIME=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ ! "${DIGQUERYTIME}" ]]; then CHECKDDNSINFOFILE=0 ; fi OLDIPADDRESS=$(cat < "${CONFIGINFO}" | grep "OLDIPADDRESS=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ ! "${OLDIPADDRESS}" ]]; then CHECKDDNSINFOFILE=0 ; fi OLDTIME=$(cat < "${CONFIGINFO}" | grep "OLDTIME=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ ! "${OLDTIME}" ]]; then CHECKDDNSINFOFILE=0 ; fi OLDTTL=$(cat < "${CONFIGINFO}" | grep "OLDTTL=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ ! "${OLDTTL}" ]]; then CHECKDDNSINFOFILE=0 ; fi else CHECKDDNSINFOFILE=0 fi if [ "${CHECKDDNSINFOFILE}" = 0 ] ; then echo "Running Time is ${DATETIME}" >> "${OUTPUTLOG}" && echo "Failed to check Config information file." >> "${OUTPUTLOG}" ; exit 1 ; fi } get_domain_dns_ttl() { if [[ "${DOMAINIPVERSION}" == "4" ]]; then [ -z "${TEMPDIGOUTPUTTTL}" ] && TEMPDIGOUTPUTTTL=$(dig A +nocmd +noall +answer +ttlid +time="${DIGQUERYTIME}" @"${DIGQUERYSERVER}" "${DOMAINNAME}" ) && DIGOUTPUTTTL=$( echo -c "${TEMPDIGOUTPUTTTL}" | tail -1 | awk '{print $2}' ) elif [[ "${DOMAINIPVERSION}" == "6" ]]; then [ -z "${TEMPDIGOUTPUTTTL}" ] && TEMPDIGOUTPUTTTL=$(dig AAAA +nocmd +noall +answer +ttlid +time="${DIGQUERYTIME}" @"${DIGQUERYSERVER}" "${DOMAINNAME}" ) && DIGOUTPUTTTL=$( echo -c "${TEMPDIGOUTPUTTTL}" | tail -1 | awk '{print $2}' ) fi if [[ ! "${DIGOUTPUTTTL}" ]]; then echo "Running Time is ${DATETIME}" >> "${OUTPUTLOG}" && echo "Failed to get domain ttl from internet." >> "${OUTPUTLOG}"; exit 1; fi } get_domain_dns_ip() { if [[ "${DOMAINIPVERSION}" == "4" ]]; then [ -z "${TEMPDIGOUTPUTIPADDRESS}" ] && TEMPDIGOUTPUTIPADDRESS=$(dig A +short +time="${DIGQUERYTIME}" @"${DIGQUERYSERVER}" "${DOMAINNAME}" ) && DIGOUTPUTIPADDRESS=$( echo -c "${TEMPDIGOUTPUTIPADDRESS}" | tail -1 ) elif [[ "${DOMAINIPVERSION}" == "6" ]]; then [ -z "${TEMPDIGOUTPUTIPADDRESS}" ] && TEMPDIGOUTPUTIPADDRESS=$(dig A +short +time="${DIGQUERYTIME}" @"${DIGQUERYSERVER}" "${DOMAINNAME}" ) && DIGOUTPUTIPADDRESS=$( echo -c "${TEMPDIGOUTPUTIPADDRESS}" | tail -1 ) fi if [[ ! "${DIGOUTPUTIPADDRESS}" ]]; then echo "Running Time is ${DATETIME}" >> "${OUTPUTLOG}" && echo "Failed to get domain public network address from internet." >> "${OUTPUTLOG}"; exit 1; fi } update_new_ipaddress() { echo "Please Edit Your Command List At Line 73" bash "${USESHELL}" } edit_config_info_file_ip() { sed -i "s/${OLDIPADDRESS}/${DIGOUTPUTIPADDRESS}/g" "${CONFIGINFO}" NEWIPADDRESS=$(cat < "${CONFIGINFO}" | grep "OLDIPADDRESS=" | awk -F "=" '{print $2}' | sed 's/\"//g' | sed "s/\'//g" ) if [[ "${DIGOUTPUTIPADDRESS}" == "${NEWIPADDRESS}" ]]; then echo "Running Time is ${DATETIME}" >> "${OUTPUTLOG}" echo "Config IP address has been modified to \"${DIGOUTPUTIPADDRESS}\"." >> "${OUTPUTLOG}" exit 0 else echo "Running Time is ${DATETIME}" >> "${OUTPUTLOG}" echo "Config IP address modification failed." >> "${OUTPUTLOG}" exit 1 fi } edit_config_info_file_ttl() { get_domain_dns_ttl sed -i '/OLDTIME/d' "${CONFIGINFO}" echo "OLDTIME=\"${RUNTIME}\"" >> "${CONFIGINFO}" sed -i '/OLDTTL/d' "${CONFIGINFO}" echo "OLDTTL=\"${DIGOUTPUTTTL}\"" >> "${CONFIGINFO}" } main() { check_environment read_config_info_file GAPTIME=$(expr "${RUNTIME}" - "${OLDTIME}") if [[ "${GAPTIME}" -ge "${OLDTTL}" ]]; then get_domain_dns_ip if [[ "${DIGOUTPUTIPADDRESS}" == "${OLDIPADDRESS}" ]]; then edit_config_info_file_ttl exit 0 else update_new_ipaddress edit_config_info_file_ip edit_config_info_file_ttl exit 0 fi else exit 0 fi exit 0 } # ------------ End ------------ main
4 、使用说明
脚本使用命令方式为
domainip-check.sh --config=config.example do_shell.sh
脚本检查完毕后自动执行后面的 do_shell.sh 里面的命令
5 、后期修订
2019/12/19 、初稿
2019/12/21 、添加 TTL 判断以便快速更新
