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442 lines
20 KiB
442 lines
20 KiB
#!/bin/sh
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# /usr/lib/ddns/dynamic_dns_updater.sh
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#
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# Original written by Eric Paul Bishop, January 2008
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# Distributed under the terms of the GNU General Public License (GPL) version 2.0
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# (Loosely) based on the script 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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# extended and partial rewritten in August 2014
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# by Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
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# to support:
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# - IPv6 DDNS services
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# - DNS Server to retrieve registered IP including TCP transport
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# - Proxy Server to send out updates
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# - force_interval=0 to run once
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# - the usage of BIND's host command instead of BusyBox's nslookup if installed
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# - extended Verbose Mode and log file support for better error detection
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#
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# variables in small chars are read from /etc/config/ddns
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# variables in big chars are defined inside these scripts as global vars
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# variables in big chars beginning with "__" are local defined inside functions only
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#set -vx #script debugger
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[ $# -lt 1 -o -n "${2//[0-3]/}" -o ${#2} -gt 1 ] && {
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echo -e "\n USAGE:"
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echo -e " $0 [SECTION] [VERBOSE_MODE]\n"
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echo " [SECTION] - service section as defined in /etc/config/ddns"
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echo " [VERBOSE_MODE] - '0' NO output to console"
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echo " '1' output to console"
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echo " '2' output to console AND logfile"
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echo " + run once WITHOUT retry on error"
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echo " '3' output to console AND logfile"
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echo " + run once WITHOUT retry on error"
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echo -e " + NOT sending update to DDNS service\n"
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exit 1
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}
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. /usr/lib/ddns/dynamic_dns_functions.sh # global vars are also defined here
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SECTION_ID="$1"
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VERBOSE_MODE=${2:-1} #default mode is log to console
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# set file names
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PIDFILE="$RUNDIR/$SECTION_ID.pid" # Process ID file
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UPDFILE="$RUNDIR/$SECTION_ID.update" # last update successful send (system uptime)
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LOGFILE="$LOGDIR/$SECTION_ID.log" # log file
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# VERBOSE_MODE > 1 delete logfile if exist to create an empty one
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# only with this data of this run for easier diagnostic
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# new one created by verbose_echo function
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[ $VERBOSE_MODE -gt 1 -a -f $LOGFILE ] && rm -f $LOGFILE
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################################################################################
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# Leave this comment here, to clearly document variable names that are expected/possible
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# Use load_all_config_options to load config options, which is a much more flexible solution.
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#
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# config_load "ddns"
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# config_get <variable> $SECTION_ID <option]>
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#
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# defined options (also used as variable):
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#
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# enable self-explanatory
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# interface network interface used by hotplug.d i.e. 'wan' or 'wan6'
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#
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# service_name Which DDNS service do you use or "custom"
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# update_url URL to use to update your "custom" DDNS service
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# update_script SCRIPT to use to update your "custom" DDNS service
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#
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# domain Your DNS name / replace [DOMAIN] in update_url
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# username Username of your DDNS service account / replace [USERNAME] in update_url
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# password Password of your DDNS service account / replace [PASSWORD] in update_url
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#
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# use_https use HTTPS to update DDNS service
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# cacert file or directory where HTTPS can find certificates to verify server; 'IGNORE' ignore check of server certificate
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#
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# use_syslog log activity to syslog
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#
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# ip_source source to detect current local IP ('network' or 'web' or 'script' or 'interface')
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# ip_network local defined network to read IP from i.e. 'wan' or 'wan6'
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# ip_url URL to read local address from i.e. http://checkip.dyndns.com/ or http://checkipv6.dyndns.com/
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# ip_script full path and name of your script to detect local IP
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# ip_interface physical interface to use for detecting
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#
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# check_interval check for changes every !!! checks below 10 minutes make no sense because the Internet
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# check_unit 'days' 'hours' 'minutes' !!! needs about 5-10 minutes to sync an IP-change for an DNS entry
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#
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# force_interval force to send an update to your service if no change was detected
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# force_unit 'days' 'hours' 'minutes' !!! force_interval="0" runs this script once for use i.e. with cron
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#
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# retry_interval if error was detected retry in
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# retry_unit 'days' 'hours' 'minutes' 'seconds'
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# retry_count #NEW# number of retries before scripts stops
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#
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# use_ipv6 #NEW# detecting/sending IPv6 address
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# force_ipversion #NEW# force usage of IPv4 or IPv6 for the whole detection and update communication
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# dns_server #NEW# using a non default dns server to get Registered IP from Internet
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# force_dnstcp #NEW# force communication with DNS server via TCP instead of default UDP
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# proxy #NEW# using a proxy for communication !!! ALSO used to detect local IP via web => return proxy's IP !!!
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# use_logfile #NEW# self-explanatory "/var/log/ddns/$SECTION_ID.log"
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#
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# some functionality needs
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# - GNU Wget or cURL installed for sending updates to DDNS service
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# - BIND host installed to detect Registered IP
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#
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################################################################################
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# verify and load SECTION_ID is exists
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[ "$(uci_get ddns $SECTION_ID)" != "service" ] && {
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[ $VERBOSE_MODE -le 1 ] && VERBOSE_MODE=2 # force console out and logfile output
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[ -f $LOGFILE ] && rm -f $LOGFILE # clear logfile before first entry
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verbose_echo "\n ************** =: ************** ************** **************"
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verbose_echo " STARTED =: PID '$$' at $(eval $DATE_PROG)"
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verbose_echo " UCI CONFIG =:\n$(uci -q show ddns | grep '=service' | sort)"
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critical_error "Service '$SECTION_ID' not defined"
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}
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load_all_config_options "ddns" "$SECTION_ID"
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verbose_echo "\n ************** =: ************** ************** **************"
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verbose_echo " STARTED =: PID '$$' at $(eval $DATE_PROG)"
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case $VERBOSE_MODE in
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0) verbose_echo " verbose mode =: '0' - run normal, NO console output";;
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1) verbose_echo " verbose mode =: '1' - run normal, console mode";;
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2) verbose_echo " verbose mode =: '2' - run once, NO retry on error";;
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3) verbose_echo " verbose mode =: '3' - run once, NO retry on error, NOT sending update";;
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*) critical_error "ERROR detecting VERBOSE_MODE '$VERBOSE_MODE'"
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esac
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verbose_echo " UCI CONFIG =:\n$(uci -q show ddns.$SECTION_ID | sort)"
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# set defaults if not defined
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[ -z "$enabled" ] && enabled=0
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[ -z "$retry_count" ] && retry_count=5
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[ -z "$use_syslog" ] && use_syslog=0 # not use syslog
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[ -z "$use_https" ] && use_https=0 # not use https
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[ -z "$use_logfile" ] && use_logfile=1 # NEW - use logfile by default
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[ -z "$use_ipv6" ] && use_ipv6=0 # NEW - use IPv4 by default
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[ -z "$force_ipversion" ] && force_ipversion=0 # NEW - default let system decide
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[ -z "$force_dnstcp" ] && force_dnstcp=0 # NEW - default UDP
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[ -z "$ip_source" ] && ip_source="network"
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[ "$ip_source" = "network" -a -z "$ip_network" -a $use_ipv6 -eq 0 ] && ip_network="wan" # IPv4: default wan
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[ "$ip_source" = "network" -a -z "$ip_network" -a $use_ipv6 -eq 1 ] && ip_network="wan6" # IPv6: default wan6
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[ "$ip_source" = "web" -a -z "$ip_url" -a $use_ipv6 -eq 0 ] && ip_url="http://checkip.dyndns.com"
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[ "$ip_source" = "web" -a -z "$ip_url" -a $use_ipv6 -eq 1 ] && ip_url="http://checkipv6.dyndns.com"
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[ "$ip_source" = "interface" -a -z "$ip_interface" ] && ip_interface="eth1"
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# check configuration and enabled state
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[ -z "$domain" -o -z "$username" -o -z "$password" ] && critical_error "Service Configuration not correctly configured"
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[ $enabled -eq 0 ] && critical_error "Service Configuration is disabled"
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# verify script if configured and executable
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if [ "$ip_source" = "script" ]; then
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[ -z "$ip_script" ] && critical_error "No script defined to detect local IP"
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[ -x "$ip_script" ] || critical_error "Script to detect local IP not found or not executable"
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fi
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# compute update interval in seconds
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get_seconds CHECK_SECONDS ${check_interval:-10} ${check_unit:-"minutes"} # default 10 min
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get_seconds FORCE_SECONDS ${force_interval:-72} ${force_unit:-"hours"} # default 3 days
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get_seconds RETRY_SECONDS ${retry_interval:-60} ${retry_unit:-"seconds"} # default 60 sec
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verbose_echo "check interval =: $CHECK_SECONDS seconds"
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verbose_echo "force interval =: $FORCE_SECONDS seconds"
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verbose_echo "retry interval =: $RETRY_SECONDS seconds"
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verbose_echo " retry counter =: $retry_count times"
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# determine what update url we're using if a service_name is supplied
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# otherwise update_url is set inside configuration (custom service)
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# or update_script is set inside configuration (custom update script)
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[ -n "$service_name" ] && get_service_data update_url update_script
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[ -z "$update_url" -a -z "$update_script" ] && critical_error "no update_url found/defined or no update_script found/defined"
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[ -n "$update_script" -a ! -f "$update_script" ] && critical_error "custom update_script not found"
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#kill old process if it exists & set new pid file
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if [ -d $RUNDIR ]; then
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#if process is already running, stop it
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if [ -e "$PIDFILE" ]; then
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OLD_PID=$(cat $PIDFILE)
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ps | grep -q "^[\t ]*$OLD_PID" && {
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verbose_echo " old process =: PID '$OLD_PID'"
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kill $OLD_PID
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} || verbose_echo "old process id =: PID 'none'"
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else
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verbose_echo "old process id =: PID 'none'"
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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 -p $RUNDIR
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verbose_echo "old process id =: PID 'none'"
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fi
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echo $$ > $PIDFILE
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# determine when the last update was
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# the following lines should prevent multiple updates if hotplug fires multiple startups
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# as described in Ticket #7820, but did not function if never an update take place
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# i.e. after a reboot (/var is linked to /tmp)
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# using uptime as reference because date might not be updated via NTP client
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get_uptime CURR_TIME
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[ -e "$UPDFILE" ] && {
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LAST_TIME=$(cat $UPDFILE)
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# check also LAST > CURR because link of /var/run to /tmp might be removed
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# i.e. boxes with larger filesystems
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[ -z "$LAST_TIME" ] && LAST_TIME=0
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[ $LAST_TIME -gt $CURR_TIME ] && LAST_TIME=0
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}
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if [ $LAST_TIME -eq 0 ]; then
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verbose_echo " last update =: never"
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else
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EPOCH_TIME=$(( $(date +%s) - CURR_TIME + LAST_TIME ))
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EPOCH_TIME="date -d @$EPOCH_TIME +'$DATE_FORMAT'"
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verbose_echo " last update =: $(eval $EPOCH_TIME)"
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fi
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# we need time here because hotplug.d is fired by netifd
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# but IP addresses are not set by DHCP/DHCPv6 etc.
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verbose_echo " waiting =: 10 seconds for interfaces to fully come up"
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sleep 10
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# verify DNS server:
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# do with retry's because there might be configurations
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# not directly could connect to outside dns when interface is already up
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ERR_VERIFY=0 # reset err counter
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while [ -n "$dns_server" ]; do
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[ $ERR_VERIFY -eq 0 ] && verbose_echo "******* VERIFY =: DNS server '$dns_server'"
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verify_dns "$dns_server"
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ERR_LAST=$? # save return value
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[ $ERR_LAST -eq 0 ] && break # everything ok leave while loop
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ERR_VERIFY=$(( $ERR_VERIFY + 1 ))
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# if error count > retry_count leave here with critical error
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[ $ERR_VERIFY -gt $retry_count ] && {
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case $ERR_LAST in
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2) critical_error "Invalid DNS server Error: '2' - nslookup can not resolve host";;
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3) critical_error "Invalid DNS server Error: '3' - nc (netcat) can not connect";;
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*) critical_error "Invalid DNS server Error: '$ERR_LAST' - unspecific error";;
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esac
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}
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case $ERR_LAST in
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2) syslog_err "Invalid DNS server Error: '2' - nslookup can not resolve host - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
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3) syslog_err "Invalid DNS server Error: '3' - nc (netcat) can not connect - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
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*) syslog_err "Invalid DNS server Error: '$ERR_LAST' - unspecific error - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
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esac
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[ $VERBOSE_MODE -gt 1 ] && {
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# VERBOSE_MODE > 1 then NO retry
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verbose_echo "\n!!!!!!!!! ERROR =: Verbose Mode - NO retry\n"
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break
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}
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verbose_echo "******** RETRY =: DNS server '$dns_server' - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds"
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sleep $RETRY_SECONDS
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done
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# verify Proxy server and set environment
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# do with retry's because there might be configurations
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# not directly could connect to outside dns when interface is already up
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ERR_VERIFY=0 # reset err counter
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[ -n "$proxy" ] && {
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[ $ERR_VERIFY -eq 0 ] && verbose_echo "******* VERIFY =: Proxy server 'http://$proxy'"
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verify_proxy "$proxy"
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ERR_LAST=$? # save return value
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[ $ERR_LAST -eq 0 ] && {
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# everything ok set proxy and leave while loop
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export HTTP_PROXY="http://$proxy"
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export HTTPS_PROXY="http://$proxy"
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export http_proxy="http://$proxy"
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export https_proxy="http://$proxy"
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break
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}
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ERR_VERIFY=$(( $ERR_VERIFY + 1 ))
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# if error count > retry_count leave here with critical error
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[ $ERR_VERIFY -gt $retry_count ] && {
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case $ERR_LAST in
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2) critical_error "Invalid Proxy server Error '2' - nslookup can not resolve host";;
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3) critical_error "Invalid Proxy server Error '3' - nc (netcat) can not connect";;
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*) critical_error "Invalid Proxy server Error '$ERR_LAST' - unspecific error";;
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esac
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}
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case $ERR_LAST in
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2) syslog_err "Invalid Proxy server Error '2' - nslookup can not resolve host - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
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3) syslog_err "Invalid Proxy server Error '3' - nc (netcat) can not connect - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
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*) syslog_err "Invalid Proxy server Error '$ERR_LAST' - unspecific error - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds\n";;
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esac
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[ $VERBOSE_MODE -gt 1 ] && {
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# VERBOSE_MODE > 1 then NO retry
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verbose_echo "\n!!!!!!!!! ERROR =: Verbose Mode - NO retry\n"
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break
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}
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verbose_echo "******** RETRY =: Proxy server 'http://$proxy' - retry $ERR_VERIFY/$retry_count in $RETRY_SECONDS seconds"
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sleep $RETRY_SECONDS
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}
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# let's check if there is already an IP registered at the web
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# but ignore errors if not
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verbose_echo "******* DETECT =: Registered IP"
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get_registered_ip REGISTERED_IP
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# loop endlessly, checking ip every check_interval and forcing an updating once every force_interval
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# NEW: ### Luci Ticket 538
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# a "force_interval" of "0" will run this script only once
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# the update is only done once when an interface goes up
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# or you run /etc/init.d/ddns start or you can use a cron job
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# it will force an update without check when lastupdate happen
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# but it will verify after "check_interval" if update is seen in the web
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# and retries on error retry_count times
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# CHANGES: ### Ticket 16363
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# modified nslookup / sed / grep to detect registered ip
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# NEW: ### Ticket 7820
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# modified nslookup to support non standard dns_server (needs to be defined in /etc/config/ddns)
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# support for BIND host command.
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# Wait for interface to fully come up, before the first update is done
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verbose_echo "*** START LOOP =: $(eval $DATE_PROG)"
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# we run NOT once
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[ $FORCE_SECONDS -gt 0 -o $VERBOSE_MODE -le 1 ] && syslog_info "Starting main loop"
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while : ; do
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# read local IP
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verbose_echo "******* DETECT =: Local IP"
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get_local_ip LOCAL_IP
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ERR_LAST=$? # save return value
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# Error in function
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[ $ERR_LAST -gt 0 ] && {
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if [ $VERBOSE_MODE -le 1 ]; then # VERBOSE_MODE <= 1 then retry
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# we can't read local IP
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ERR_LOCAL_IP=$(( $ERR_LOCAL_IP + 1 ))
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[ $ERR_LOCAL_IP -gt $retry_count ] && critical_error "Can not detect local IP"
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verbose_echo "\n!!!!!!!!! ERROR =: detecting local IP - retry $ERR_LOCAL_IP/$retry_count in $RETRY_SECONDS seconds\n"
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syslog_err "Error detecting local IP - retry $ERR_LOCAL_IP/$retry_count in $RETRY_SECONDS seconds"
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sleep $RETRY_SECONDS
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continue # jump back to the beginning of while loop
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else
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verbose_echo "\n!!!!!!!!! ERROR =: detecting local IP - NO retry\n"
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fi
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}
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ERR_LOCAL_IP=0 # reset err counter
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# prepare update
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# never updated or forced immediate then NEXT_TIME = 0
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[ $FORCE_SECONDS -eq 0 -o $LAST_TIME -eq 0 ] \
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&& NEXT_TIME=0 \
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|| NEXT_TIME=$(( $LAST_TIME + $FORCE_SECONDS ))
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# get current uptime
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get_uptime CURR_TIME
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# send update when current time > next time or local ip different from registered ip (as loop on error)
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ERR_SEND=0
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while [ $CURR_TIME -ge $NEXT_TIME -o "$LOCAL_IP" != "$REGISTERED_IP" ]; do
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if [ $VERBOSE_MODE -gt 2 ]; then
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verbose_echo " VERBOSE MODE =: NO UPDATE send to DDNS provider"
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elif [ "$LOCAL_IP" != "$REGISTERED_IP" ]; then
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verbose_echo "******* UPDATE =: LOCAL: '$LOCAL_IP' <> REGISTERED: '$REGISTERED_IP'"
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else
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verbose_echo "******* FORCED =: LOCAL: '$LOCAL_IP' == REGISTERED: '$REGISTERED_IP'"
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fi
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# only send if VERBOSE_MODE < 3
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ERR_LAST=0
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[ $VERBOSE_MODE -lt 3 ] && {
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send_update "$LOCAL_IP"
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ERR_LAST=$? # save return value
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}
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# Error in function
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if [ $ERR_LAST -gt 0 ]; then
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if [ $VERBOSE_MODE -le 1 ]; then # VERBOSE_MODE <=1 then retry
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# error sending local IP
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ERR_SEND=$(( $ERR_SEND + 1 ))
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[ $ERR_SEND -gt $retry_count ] && critical_error "can not send update to DDNS Provider"
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verbose_echo "\n!!!!!!!!! ERROR =: sending update - retry $ERR_SEND/$retry_count in $RETRY_SECONDS seconds\n"
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syslog_err "Error sending update - retry $ERR_SEND/$retry_count in $RETRY_SECONDS seconds"
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sleep $RETRY_SECONDS
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continue # re-loop
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else
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verbose_echo "\n!!!!!!!!! ERROR =: sending update to DDNS service - NO retry\n"
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break
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fi
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else
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# we send data so save "last time"
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get_uptime LAST_TIME
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echo $LAST_TIME > $UPDFILE # save LASTTIME to file
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[ "$LOCAL_IP" != "$REGISTERED_IP" ] \
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&& syslog_notice "Changed IP: '$LOCAL_IP' successfully send" \
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|| syslog_notice "Forced Update: IP: '$LOCAL_IP' successfully send"
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break # leave while
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fi
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done
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# now we wait for check interval before testing if update was recognized
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# only sleep if VERBOSE_MODE <= 2 because nothing send so do not wait
|
|
[ $VERBOSE_MODE -le 2 ] && {
|
|
verbose_echo "****** WAITING =: $CHECK_SECONDS seconds (Check Interval) before continue"
|
|
sleep $CHECK_SECONDS
|
|
} || verbose_echo " VERBOSE MODE =: NO WAITING for Check Interval\n"
|
|
|
|
# read at DDNS service registered IP (in loop on error)
|
|
REGISTERED_IP=""
|
|
ERR_REG_IP=0
|
|
while : ; do
|
|
verbose_echo "******* DETECT =: Registered IP"
|
|
get_registered_ip REGISTERED_IP
|
|
ERR_LAST=$? # save return value
|
|
|
|
# No Error in function we leave while loop
|
|
[ $ERR_LAST -eq 0 ] && break
|
|
|
|
# we can't read Registered IP
|
|
if [ $VERBOSE_MODE -le 1 ]; then # VERBOSE_MODE <=1 then retry
|
|
ERR_REG_IP=$(( $ERR_REG_IP + 1 ))
|
|
[ $ERR_REG_IP -gt $retry_count ] && critical_error "can not detect registered local IP"
|
|
verbose_echo "\n!!!!!!!!! ERROR =: detecting Registered IP - retry $ERR_REG_IP/$retry_count in $RETRY_SECONDS seconds\n"
|
|
syslog_err "Error detecting Registered IP - retry $ERR_REG_IP/$retry_count in $RETRY_SECONDS seconds"
|
|
sleep $RETRY_SECONDS
|
|
else
|
|
verbose_echo "\n!!!!!!!!! ERROR =: detecting Registered IP - NO retry\n"
|
|
break # leave while loop
|
|
fi
|
|
done
|
|
|
|
# IP's are still different
|
|
if [ "$LOCAL_IP" != "$REGISTERED_IP" ]; then
|
|
if [ $VERBOSE_MODE -le 1 ]; then # VERBOSE_MODE <=1 then retry
|
|
ERR_UPDATE=$(( $ERR_UPDATE + 1 ))
|
|
[ $ERR_UPDATE -gt $retry_count ] && critical_error "Registered IP <> Local IP - LocalIP: '$LOCAL_IP' - RegisteredIP: '$REGISTERED_IP'"
|
|
verbose_echo "\n!!!!!!!!! ERROR =: Registered IP <> Local IP - starting retry $ERR_UPDATE/$retry_count\n"
|
|
syslog_warn "Warning: Registered IP <> Local IP - starting retry $ERR_UPDATE/$retry_count"
|
|
continue # loop to beginning
|
|
else
|
|
verbose_echo "\n!!!!!!!!! ERROR =: Registered IP <> Local IP - LocalIP: '$LOCAL_IP' - RegisteredIP: '$REGISTERED_IP' - NO retry\n"
|
|
fi
|
|
fi
|
|
|
|
# we checked successful the last update
|
|
ERR_UPDATE=0 # reset error counter
|
|
|
|
# force_update=0 or VERBOSE_MODE > 1 - leave the main loop
|
|
[ $FORCE_SECONDS -eq 0 -o $VERBOSE_MODE -gt 1 ] && {
|
|
verbose_echo "****** LEAVING =: $(eval $DATE_PROG)"
|
|
syslog_info "Leaving"
|
|
break
|
|
}
|
|
verbose_echo "********* LOOP =: $(eval $DATE_PROG)"
|
|
syslog_info "Rerun IP check"
|
|
done
|
|
|
|
verbose_echo "****** STOPPED =: PID '$$' at $(eval $DATE_PROG)\n"
|
|
syslog_info "Done"
|
|
|
|
exit 0
|