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 <stars@starryvoid.com>
# 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
