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#!/bin/env bash
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# WAN IP Checker - Whenever server WAN IP address changes, inform admins via email
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# Copyright (C) 2020 Pekka Helenius
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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###########################################################
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# A script for remote server environments which are behind
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# dynamic (non-static) DHCP. Usually these dynamic IPs are
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# used in common household networks in non-corporate
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# environments.
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###########################################################
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# Script requirements
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#
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# sSMTP
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# https://wiki.archlinux.org/index.php/SSMTP
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# Relevant conf files
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# /etc/ssmtp/revaliases (email conf)
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# /etc/ssmtp/ssmtp.conf (email conf)
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# /etc/ssmtp/wanchecker.conf (env vars, email conf)
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# Because your email password is stored as clear text in /etc/ssmtp/ssmtp.conf, it is important that this file
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# is secure. By default, the entire /etc/ssmtp directory is accessible only by root and the mail group.
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# The /usr/bin/ssmtp binary runs as the mail group and can read this file. There is no reason to add
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# yourself or other users to the mail group.
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###########################################################
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############################
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# Fallback DNS
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# This service must work even if our system-wide DNS configuration fails
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# NOTE: If your WAN firewall blocks external DNS servers, this fallback method fails.
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#
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# List of overriding fallback DNS servers
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#
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# CURL:
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# Optionally requires curl built with '--enable-dnsshuffle' and '--enable-ares' configure options
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#
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# Other applications:
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# Requires shell preload library '/usr/lib/libresolvconf-override.so' (https://github.com/hadess/resolvconf-override)
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#
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FALLBACK_DNS=(
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# OpenDNS
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208.67.220.222
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208.67.220.220
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# Google DNS
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8.8.8.8
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8.8.4.4
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# OpenNIC DNS
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58.6.115.42
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58.6.115.43
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119.31.230.42
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200.252.98.162
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217.79.186.148
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81.89.98.6
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78.159.101.37
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203.167.220.153
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82.229.244.191
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216.87.84.211
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66.244.95.20
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207.192.69.155
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72.14.189.120
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# Alternate DNS
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198.101.242.72
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23.253.163.53
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# FreeDNS
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37.235.1.174
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37.235.1.177
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)
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############################
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source /etc/ssmtp/wanchecker.conf
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############################
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function resolvconfOverrideDNSList {
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local i=0
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local max_dns=4
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local dns_strlist=""
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while [[ $i -lt $(( ${#FALLBACK_DNS[@]} - 1)) ]]; do
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[[ ${i} == ${max_dns} ]] && break
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dns_strlist="${dns_strlist} NAMESERVER$((${i} + 1))=${FALLBACK_DNS[$i]}"
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let i++
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done
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echo "${dns_strlist}"
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}
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function curlFallBackDNS {
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fallback_dns=""
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preload_lib=""
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if [[ $(curl -V | grep -c -oE '(c-ares|AsynchDNS)') -eq 2 ]] &&
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[[ $ENABLE_FALLBACK_DNS == 1 ]]; then
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# Fallback DNS servers can be used
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fallback_dns=$(echo ${FALLBACK_DNS[*]} | sed 's/ /,/g')
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elif [[ -f "/usr/lib/libresolvconf-override.so" ]] && [[ $ENABLE_FALLBACK_DNS == 1 ]]; then
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# Curl is built without '--enable-dnsshuffle' and fallback is enabled
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preload_lib="LD_PRELOAD=/usr/lib/libresolvconf-override.so $(resolvconfOverrideDNSList)"
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fi
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if [[ ${fallback_dns} != "" ]]; then
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fallback_dns="--dns-servers ${fallback_dns}"
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fi
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CURL_DNS_LIST=("${preload_lib}" "${fallback_dns}")
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}
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function getMyIP {
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RESOLVERS=(
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# Does not work anymore
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#"dig +short myip.opendns.com @resolver1.opendns.com"
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"${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} https://checkip.amazonaws.com"
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"${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} checkip.dyndns.org"
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"${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} ifconfig.me"
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"${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} ipecho.net/plain"
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"${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} bot.whatismyipaddress.com"
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"${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} icanhazip.com"
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)
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IFS=$'\n'
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response=""
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for resolver in ${RESOLVERS[@]}; do
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check=$(eval "${resolver}" | grep -oE "([0-9]{1,3}\.){3}[0-9]{1,3}")
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if [[ ${check} =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; then
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response=${check}
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break
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fi
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done
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IFS=' '
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}
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function getMyCity() {
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city=$(eval ${CURL_DNS_LIST[0]} curl -s ${CURL_DNS_LIST[1]} https://json.geoiplookup.io/${response} | awk -F '"' '/city/{ print $(NF-1); }')
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}
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function checkWANIP {
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# Log file timestamp format
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local TIMESTAMP=$(date '+%d-%m-%Y,%X')
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# Resolve the current IPv4 WAN address
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# Attempt with system common DNS resolvers
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getMyIP
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if [[ ${response} == "" ]]; then
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# Fallback to listed DNS resolvers
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curlFallBackDNS
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getMyIP
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fi
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local WANIP_CURRENT="${response}"
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############################
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# If we are connected to internet...
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# There's no point to do WAN IP check if we can't establish connection to WAN/Internet at all
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# In addition, do not generate any network related variables if the connection
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# can't be established. Therefore, include variable defitions inside this if statement.
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if [[ ${response} != "" ]]; then
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# Get city information for email, based on fetched WAN IP address
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unset CURL_DNS_LIST
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# Attempt with system common DNS resolvers
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getMyCity
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if [[ ${city} == "" ]]; then
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# Fallback to listed DNS resolvers
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curlFallBackDNS
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getMyCity
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if [[ ${city} == "" ]]; then
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city="Default"
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fi
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fi
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local WANIP_CITY="${city}"
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############################
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if [[ ! -d "${WANIP_DIR}" ]]; then
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mkdir -p "${WANIP_DIR}"
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fi
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if [[ ! -f "${WANIP_LOG}" ]] || [[ $(cat "${WANIP_LOG}" | wc -l) == 0 ]]; then
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printf "%-25s%-18s%-8s\n" "Time" "WAN IPv4" "Email sent" > "${WANIP_LOG}"
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chmod o-r "${WANIP_LOG}"
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fi
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if [[ $(cat "${WANIP_LOG}" | wc -l) -gt 1 ]] ; then
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local WANIP_OLD=$(tail -1 "${WANIP_LOG}" | grep -oE '([0-9]{2,3}\.){3}([0-9]{2,3})')
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fi
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if [[ ${WANIP_OLD} == "" ]]; then
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# Email subject/title
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local SUBJECT_EMAIL="New WAN IP address registered (${WANIP_CITY}, ${WANIP_CURRENT})"
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# Email message/body contents
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local MESSAGE_EMAIL="${TIMESTAMP}: New WAN IP address ${WANIP_CURRENT} has been registered in location ${WANIP_CITY}. Notifier: $(cat /etc/hostname)"
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# Message to server stdout
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local MESSAGE_STDOUT="${TIMESTAMP} - New WAN IP address ${WANIP_CURRENT} has been registered for this computer"
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else
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# Email subject/title
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local SUBJECT_EMAIL="WAN IP address changed (${WANIP_CITY}, ${WANIP_OLD} -> ${WANIP_CURRENT})"
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# Email message/body contents
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local MESSAGE_EMAIL="${TIMESTAMP}: WAN IP address ${WANIP_OLD} has been changed to ${WANIP_CURRENT} in location ${WANIP_CITY}. Notifier: $(cat /etc/hostname)"
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# Message to server stdout
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local MESSAGE_STDOUT="${TIMESTAMP} - WAN IP address of this computer ($(cat /etc/hostname)) has been changed from ${WANIP_OLD} to ${WANIP_CURRENT}"
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fi
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############################
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function mailSend {
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local EMAIL_FORM="To: ${1}\nFrom: ${EMAIL_SENDER}\nSubject: ${SUBJECT_EMAIL}\n\n${MESSAGE_EMAIL}"
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echo -e "${EMAIL_FORM}" | ${ssmtp_exec} -v "${1}"
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if [[ $? -eq 0 ]]; then
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MAIL_SENT="OK"
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else
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if [[ -f "/usr/lib/libresolvconf-override.so" ]] && [[ $ENABLE_FALLBACK_DNS == 1 ]]; then
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SENDMAIL_PRELOAD="LD_PRELOAD=/usr/lib/libresolvconf-override.so $(resolvconfOverrideDNSList)"
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echo -e "${EMAIL_FORM}" | $(eval ${SENDMAIL_PRELOAD} ${ssmtp_exec} -v "${1}")
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if [[ $? -eq 0 ]]; then
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MAIL_SENT="OK"
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fi
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fi
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fi
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}
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############################
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typeset -A MAIL_SENT_STATUSES
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if [[ "${WANIP_OLD}" != "${WANIP_CURRENT}" ]] || \
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[[ $(cat "${WANIP_LOG}" | wc -l) -eq 1 ]] ; then
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echo -e "${MESSAGE_STDOUT}"
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IFS=$' '
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retry=4
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r=0
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for recipient in $EMAIL_RECIPIENTS; do
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MAIL_SENT="NOK"
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while [[ $r < $retry ]]; do
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mailSend "${recipient}"
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[[ "${MAIL_SENT}" == "OK" ]] && break
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sleep 5
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let r++
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done
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MAIL_SENT_STATUSES+=([${recipient}]="${MAIL_SENT}")
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done
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IFS=
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MAIL_SENT_STATUSES_STR=""
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for email in ${!MAIL_SENT_STATUSES[@]}; do
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MAIL_SENT_STATUSES_STR="${MAIL_SENT_STATUSES_STR}${email}:${MAIL_SENT_STATUSES[$email]},"
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done
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MAIL_SENT_STATUSES_STR=$(echo "${MAIL_SENT_STATUSES_STR}" | sed 's/,$//')
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printf "%-25s%-18s%s\n" "${TIMESTAMP}" "${WANIP_CURRENT}" "${MAIL_SENT_STATUSES_STR}" >> "${WANIP_LOG}"
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fi
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fi
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}
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############################
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checkWANIP
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