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petrified
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petrified
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#!/bin/bash
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#
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# petrified - bash client to update dynamic DNS at freedns.afraid.org
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# Copyright (c) 2014 Troy Engel
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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, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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## Version: 1.0
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## One of these must exist - '-c <config>' ignores global/local entirely
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CONF_GLOBAL=/etc/petrified.conf
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CONF_LOCAL=~/.petrifiedrc
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CONF_NAMED=""
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# Check our arguments for a config file
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while getopts ":c:" opt; do
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case $opt in
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c)
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CONF_NAMED="$OPTARG"
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;;
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:)
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echo "Option -$OPTARG requires the name of a config file." >&2
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exit 1
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;;
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esac
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done
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## How to update DNS - DDNS_KEY is unique per domain
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DDNS_URL=https://freedns.afraid.org/dynamic/update.php
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DDNS_KEY=""
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## Which URL to use to get an IP
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# IPv4 icanhazip (http://major.io/icanhazip-com-faq/)
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DDNS_CHECK="http://4.icanhazip.com"
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# IPv6 icanhazip (http://major.io/icanhazip-com-faq/)
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#DDNS_CHECK="http://6.icanhazip.com"
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## How many seconds should curl wait when either checking your IP or
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## trying to update the remote DNS
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CURL_WAIT=10
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## Report an internal IP instead of the public IP - useful if you're
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## using dynamic DNS for machines on the internal network
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LOCAL_MODE=0
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# Specify which interface
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LOCAL_IF=eth0
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# Should we use IPv4 or IPv6
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LOCAL_IV=4
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## How to log - multiple supported
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USE_JOURNAL=1
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USE_SYSLOG=0
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USE_STDOUT=0
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USE_LOGFILE=0
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## If USE_LOGFILE is 1, where to log
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PET_LOG=/var/log/petrified.log
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## Prevent race conditions, i.e. stuck crons piling up
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USE_PID=1
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PET_PID=/run/petrified.pid
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## Save the IP from our last check
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USE_LIP=1
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PET_LIP=/var/cache/petrified/lastip.dat
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## Dependencies:
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# logger (util-linux)
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# kill (util-linux)
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# printf (coreutils)
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# touch (coreutils)
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# date (coreutils)
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# cat (coreutils)
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# rm (coreutils)
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# bash (bash)
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# ip (iproute2)
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# curl (curl)
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####
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# Read in our configs
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if [[ -z "{CONF_NAMED}" ]]; then
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[[ -r "${CONF_GLOBAL}" ]] && source "${CONF_GLOBAL}"
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[[ -r "${CONF_LOCAL}" ]] && source "${CONF_LOCAL}"
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else
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[[ -r "${CONF_NAMED}" ]] && source "${CONF_NAMED}"
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fi
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# Check that we have all the needed variables
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if [[ -z "${DDNS_KEY}" ]]; then
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echo "DDNS_KEY must be configured, exiting."
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exit 1
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fi
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# Make sure that PET_LOG will work if required
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if (( ${USE_LOGFILE} == 1 )); then
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if [[ -z "${PET_LOG}" ]]; then
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echo "USE_LOGFILE=1 but PET_LOG is an empty string, exiting."
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exit 1
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elif (( $(touch "${PET_LOG}" 2>/dev/null; echo $?;) != 0 )); then
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echo "USE_LOGFILE=1 but cannot write to ${PET_LOG}, exiting."
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exit 1
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fi
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fi
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# Logging
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logmsg () {
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LMSG=$1
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if (( ${USE_JOURNAL} == 1 )); then
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printf "%s\n%s\n" "SYSLOG_IDENTIFIER=petrified" "MESSAGE=${LMSG}" | \
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logger --journald
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fi
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if (( ${USE_SYSLOG} == 1 )); then
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echo "${LMSG}" | logger -t petrified
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fi
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if (( ${USE_STDOUT} == 1 )); then
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DTS=$(date +"%Y-%M-%d %H:%M:%S")
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echo "[${DTS}] [petrified] ${LMSG}"
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fi
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if (( ${USE_LOGFILE} == 1 )); then
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DTS=$(date +"%Y-%M-%d %H:%M:%S")
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echo "[${DTS}] [petrified] ${LMSG}" >> "${PET_LOG}"
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fi
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return
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}
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# Make sure that PET_PID will work if required
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if (( ${USE_PID} == 1 )); then
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if [[ -z "${PET_PID}" ]]; then
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logmsg "USE_PID=1 but PET_PID is an empty string, exiting."
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exit 1
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elif (( $(touch "${PET_PID}" 2>/dev/null; echo $?;) != 0 )); then
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logmsg "USE_PID=1 but cannot write to ${PET_PID}, exiting."
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exit 1
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fi
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fi
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# PID actions
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if (( ${USE_PID} == 1 )); then
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PIDNUM=$(cat "${PET_PID}" 2>/dev/null)
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# check if we have a number
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if [[ ${PIDMUM} =~ ^-?[0-9]+$ ]]; then
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kill -0 ${PIDNUM}
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if (( $? == 0 )); then
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logmsg "Detected a running process ${PIDNUM}, exiting."
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exit 1
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else
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logmsg "Stale PID ${PIDNUM} detected, overwriting."
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fi
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fi
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echo ${BASHPID} > "${PET_PID}"
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fi
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# Cleanup actions
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cleanup () {
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(( ${USE_PID} == 1 )) && (rm -f "${PET_PID}" 1>/dev/null 2>&1)
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(( ${USE_LIP} == 0 )) && (rm -f "${PET_LIP}" 1>/dev/null 2>&1)
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return
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}
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# Trap the basic signals
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sigexit () {
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logmsg "Trapped a kill signal, exiting."
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cleanup
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exit 3
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}
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trap sigexit SIGHUP SIGINT SIGTERM
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# Get our IP address
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NEWIP=""
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if (( ${LOCAL_MODE} == 1 )); then
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NEWIP=$(ip -${LOCAL_IV} -o addr show dev ${LOCAL_IF} primary 2>/dev/null)
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NEWIP=${NEWIP%%/*}
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NEWIP=${NEWIP##* }
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else
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NEWIP=$(curl -m ${CURL_WAIT} -s ${DDNS_CHECK} 2>/dev/null)
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fi
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if [[ -z "${NEWIP}" ]]; then
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logmsg "Error getting an IP address, exiting."
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exit 1
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fi
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# Check our saved IP against the new IP
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OLDIP="0"
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if (( ${USE_LIP} == 1 )); then
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OLD_IP=$(cat "${PET_LIP}" 2>/dev/null)
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fi
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# If they don't match, tell upstream
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if [[ "${OLDIP}" != "${NEWIP}" ]]; then
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UPDURL="${DDNS_URL}?${DDNS_KEY}&address=${NEWIP}"
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RESULT=$(curl -m ${CURL_WAIT} -sk "${UPDURL}" 2>/dev/null)
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logmsg "${RESULT}"
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fi
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# Save the new IP if configured
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if (( ${USE_LIP} == 1 )); then
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if (( $(touch "${PET_LIP}" 2>/dev/null; echo $?;) != 0 )); then
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logmsg "USE_LIP=1 but cannot write to ${PET_LIP}."
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else
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echo "${NEWIP}" > "${PET_LIP}"
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fi
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fi
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# Take out the trash
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cleanup
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exit 0
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