Christian Schoenebeck
parent
8d1f73fd26
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aabc203d54
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#!/bin/sh
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# /usr/lib/dynamic_dns/dynamic_dns_updater.sh
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#
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# Written by Eric Paul Bishop, Janary 2008
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# Distributed under the terms of the GNU General Public License (GPL) version 2.0
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#
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# This script is (loosely) based on the one posted by exobyte in the forums here:
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# http://forum.openwrt.org/viewtopic.php?id=14040
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#
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. /usr/lib/ddns/dynamic_dns_functions.sh
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service_id=$1
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if [ -z "$service_id" ]
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then
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echo "ERRROR: You must specify a service id (the section name in the /etc/config/ddns file) to initialize dynamic DNS."
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return 1
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fi
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#default mode is verbose_mode, but easily turned off with second parameter
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verbose_mode="1"
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if [ -n "$2" ]
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then
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verbose_mode="$2"
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fi
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###############################################################
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# Leave this comment here, to clearly document variable names
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# that are expected/possible
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#
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# Now use load_all_config_options to load config
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# options, which is a much more flexible solution.
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#
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#
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#config_load "ddns"
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#
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#config_get enabled $service_id enabled
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#config_get service_name $service_id service_name
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#config_get update_url $service_id update_url
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#
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#
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#config_get username $service_id username
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#config_get password $service_id password
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#config_get domain $service_id domain
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#
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#
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#config_get use_https $service_id use_https
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#config_get use_syslog $service_id use_syslog
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#config_get cacert $service_id cacert
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#
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#config_get ip_source $service_id ip_source
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#config_get ip_interface $service_id ip_interface
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#config_get ip_network $service_id ip_network
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#config_get ip_url $service_id ip_url
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#
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#config_get force_interval $service_id force_interval
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#config_get force_unit $service_id force_unit
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#
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#config_get check_interval $service_id check_interval
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#config_get check_unit $service_id check_unit
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#########################################################
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load_all_config_options "ddns" "$service_id"
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#some defaults
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if [ -z "$check_interval" ]
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then
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check_interval=600
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fi
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if [ -z "$retry_interval" ]
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then
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retry_interval=60
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fi
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if [ -z "$check_unit" ]
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then
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check_unit="seconds"
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fi
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if [ -z "$force_interval" ]
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then
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force_interval=72
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fi
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if [ -z "$force_unit" ]
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then
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force_unit="hours"
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fi
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if [ -z $use_syslog ]
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then
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use_syslog=0
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fi
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if [ -z "$use_https" ]
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then
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use_https=0
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fi
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#some constants
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retrieve_prog="/usr/bin/wget -O - ";
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if [ "x$use_https" = "x1" ]
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then
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/usr/bin/wget --version 2>&1 |grep -q "\+ssl"
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if [ $? -eq 0 ]
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then
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if [ -f "$cacert" ]
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then
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retrieve_prog="${retrieve_prog}--ca-certificate=${cacert} "
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elif [ -d "$cacert" ]
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then
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retrieve_prog="${retrieve_prog}--ca-directory=${cacert} "
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fi
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else
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retrieve_prog="/usr/bin/curl "
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if [ -f "$cacert" ]
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then
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retrieve_prog="${retrieve_prog}--cacert $cacert "
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elif [ -d "$cacert" ]
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then
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retrieve_prog="${retrieve_prog}--capath $cacert "
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fi
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fi
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fi
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service_file="/usr/lib/ddns/services"
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ip_regex="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
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NEWLINE_IFS='
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'
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#determine what update url we're using if the service_name is supplied
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if [ -n "$service_name" ]
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then
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#remove any lines not containing data, and then make sure fields are enclosed in double quotes
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quoted_services=$(cat $service_file | grep "^[\t ]*[^#]" | awk ' gsub("\x27", "\"") { if ($1~/^[^\"]*$/) $1="\""$1"\"" }; { if ( $NF~/^[^\"]*$/) $NF="\""$NF"\"" }; { print $0 }' )
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#echo "quoted_services = $quoted_services"
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OLD_IFS=$IFS
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IFS=$NEWLINE_IFS
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for service_line in $quoted_services
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do
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#grep out proper parts of data and use echo to remove quotes
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next_name=$(echo $service_line | grep -o "^[\t ]*\"[^\"]*\"" | xargs -r -n1 echo)
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next_url=$(echo $service_line | grep -o "\"[^\"]*\"[\t ]*$" | xargs -r -n1 echo)
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if [ "$next_name" = "$service_name" ]
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then
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update_url=$next_url
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fi
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done
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IFS=$OLD_IFS
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fi
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if [ "x$use_https" = x1 ]
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then
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update_url=$(echo $update_url | sed -e 's/^http:/https:/')
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fi
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verbose_echo "update_url=$update_url"
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#if this service isn't enabled then quit
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if [ "$enabled" != "1" ]
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then
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return 0
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fi
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#compute update interval in seconds
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case "$force_unit" in
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"days" )
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force_interval_seconds=$(($force_interval*60*60*24))
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;;
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"hours" )
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force_interval_seconds=$(($force_interval*60*60))
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;;
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"minutes" )
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force_interval_seconds=$(($force_interval*60))
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;;
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"seconds" )
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force_interval_seconds=$force_interval
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;;
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* )
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#default is hours
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force_interval_seconds=$(($force_interval*60*60))
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;;
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esac
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#compute check interval in seconds
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case "$check_unit" in
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"days" )
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check_interval_seconds=$(($check_interval*60*60*24))
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;;
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"hours" )
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check_interval_seconds=$(($check_interval*60*60))
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;;
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"minutes" )
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check_interval_seconds=$(($check_interval*60))
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;;
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"seconds" )
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check_interval_seconds=$check_interval
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;;
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* )
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#default is seconds
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check_interval_seconds=$check_interval
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;;
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esac
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#compute retry interval in seconds
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case "$retry_unit" in
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"days" )
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retry_interval_seconds=$(($retry_interval*60*60*24))
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;;
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"hours" )
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retry_interval_seconds=$(($retry_interval*60*60))
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;;
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"minutes" )
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retry_interval_seconds=$(($retry_interval*60))
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;;
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"seconds" )
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retry_interval_seconds=$retry_interval
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;;
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* )
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#default is seconds
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retry_interval_seconds=$retry_interval
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;;
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esac
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verbose_echo "force seconds = $force_interval_seconds"
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verbose_echo "check seconds = $check_interval_seconds"
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#kill old process if it exists & set new pid file
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if [ -d /var/run/dynamic_dns ]
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then
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#if process is already running, stop it
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if [ -e "/var/run/dynamic_dns/$service_id.pid" ]
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then
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old_pid=$(cat /var/run/dynamic_dns/$service_id.pid)
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test_match=$(ps | grep "^[\t ]*$old_pid")
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verbose_echo "old process id (if it exists) = \"$test_match\""
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if [ -n "$test_match" ]
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then
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kill $old_pid
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fi
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fi
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else
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#make dir since it doesn't exist
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mkdir /var/run/dynamic_dns
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fi
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echo $$ > /var/run/dynamic_dns/$service_id.pid
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#determine when the last update was
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current_time=$(monotonic_time)
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last_update=$(( $current_time - (2*$force_interval_seconds) ))
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if [ -e "/var/run/dynamic_dns/$service_id.update" ]
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then
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last_update=$(cat /var/run/dynamic_dns/$service_id.update)
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fi
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time_since_update=$(($current_time - $last_update))
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human_time_since_update=$(( $time_since_update / ( 60 * 60 ) ))
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verbose_echo "time_since_update = $human_time_since_update hours"
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#do update and then loop endlessly, checking ip every check_interval and forcing an updating once every force_interval
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while [ true ]
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do
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registered_ip=$(echo $(nslookup "$domain" 2>/dev/null) | grep -o "Name:.*" | grep -o "$ip_regex")
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current_ip=$(get_current_ip)
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current_time=$(monotonic_time)
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time_since_update=$(($current_time - $last_update))
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syslog_echo "Running IP check ..."
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verbose_echo "Running IP check..."
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verbose_echo "current system ip = $current_ip"
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verbose_echo "registered domain ip = $registered_ip"
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if [ "$current_ip" != "$registered_ip" ] || [ $force_interval_seconds -lt $time_since_update ]
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then
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verbose_echo "update necessary, performing update ..."
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#do replacement
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final_url=$update_url
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for option_var in $ALL_OPTION_VARIABLES
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do
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if [ "$option_var" != "update_url" ]
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then
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replace_name=$(echo "\[$option_var\]" | tr 'a-z' 'A-Z')
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replace_value=$(eval echo "\$$option_var")
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replace_value=$(echo $replace_value | sed -f /usr/lib/ddns/url_escape.sed)
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final_url=$(echo $final_url | sed s^"$replace_name"^"$replace_value"^g )
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fi
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done
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final_url=$(echo $final_url | sed s^"\[HTTPAUTH\]"^"${username//^/\\^}${password:+:${password//^/\\^}}"^g )
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final_url=$(echo $final_url | sed s/"\[IP\]"/"$current_ip"/g )
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verbose_echo "updating with url=\"$final_url\""
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#here we actually connect, and perform the update
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update_output=$( $retrieve_prog "$final_url" )
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if [ $? -gt 0 ]
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then
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syslog_echo "update failed, retrying in $retry_interval_seconds seconds"
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verbose_echo "update failed"
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sleep $retry_interval_seconds
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continue
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fi
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syslog_echo "Update successful"
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verbose_echo "Update Output:"
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verbose_echo "$update_output"
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verbose_echo ""
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#save the time of the update
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current_time=$(monotonic_time)
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last_update=$current_time
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time_since_update='0'
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registered_ip=$current_ip
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human_time=$(date)
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verbose_echo "update complete, time is: $human_time"
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echo "$last_update" > "/var/run/dynamic_dns/$service_id.update"
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else
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human_time=$(date)
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human_time_since_update=$(( $time_since_update / ( 60 * 60 ) ))
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verbose_echo "update unnecessary"
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verbose_echo "time since last update = $human_time_since_update hours"
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verbose_echo "the time is now $human_time"
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fi
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#sleep for 10 minutes, then re-check ip && time since last update
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sleep $check_interval_seconds
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done
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#should never get here since we're a daemon, but I'll throw it in anyway
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return 0
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