net/ddns-scripts/files/usr/lib/ddns/dynamic_dns_updater.sh

   1 #!/bin/sh
   2 # /usr/lib/ddns/dynamic_dns_updater.sh
   3 #
   4 # Original written by Eric Paul Bishop, January 2008
   5 # Distributed under the terms of the GNU General Public License (GPL) version 2.0
   6 # (Loosely) based on the script on the one posted by exobyte in the forums here:
   7 # http://forum.openwrt.org/viewtopic.php?id=14040
   8 #
   9 # extended and partial rewritten in August 2014
  10 # by Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
  11 # to support:
  12 # - IPv6 DDNS services
  13 # - DNS Server to retrieve registered IP including TCP transport (Ticket 7820)
  14 # - Proxy Server to send out updates
  15 # - force_interval=0 to run once (Luci Ticket 538)
  16 # - the usage of BIND's host command instead of BusyBox's nslookup if installed
  17 # - extended Verbose Mode and log file support for better error detection
  18 # - wait for interface to fully come up, before the first update is done
  19 #
  20 # variables in small chars are read from /etc/config/ddns
  21 # variables in big chars are defined inside these scripts as global vars
  22 # variables in big chars beginning with "__" are local defined inside functions only
  23 #set -vx        #script debugger
  24
  25 [ $# -lt 1 -o -n "${2//[0-3]/}" -o ${#2} -gt 1 ] && {
  26         echo -e "\n  USAGE:"
  27         echo -e "  $0 [SECTION] [VERBOSE_MODE]\n"
  28         echo    "  [SECTION]      - service section as defined in /etc/config/ddns"
  29         echo    "  [VERBOSE_MODE] - '0' NO output to console"
  30         echo    "                   '1' output to console"
  31         echo    "                   '2' output to console AND logfile"
  32         echo    "                       + run once WITHOUT retry on error"
  33         echo    "                   '3' output to console AND logfile"
  34         echo    "                       + run once WITHOUT retry on error"
  35         echo -e "                       + NOT sending update to DDNS service\n"
  36         exit 1
  37 }
  38
  39 . /usr/lib/ddns/dynamic_dns_functions.sh        # global vars are also defined here
  40
  41 SECTION_ID="$1"
  42 VERBOSE_MODE=${2:-1}    # default mode is log to console
  43
  44 # set file names
  45 PIDFILE="$RUNDIR/$SECTION_ID.pid"       # Process ID file
  46 UPDFILE="$RUNDIR/$SECTION_ID.update"    # last update successful send (system uptime)
  47 DATFILE="$RUNDIR/$SECTION_ID.dat"       # save stdout data of WGet and other extern programs called
  48 ERRFILE="$RUNDIR/$SECTION_ID.err"       # save stderr output of WGet and other extern programs called
  49 LOGFILE="$LOGDIR/$SECTION_ID.log"       # log file
  50
  51 # VERBOSE_MODE > 1 delete logfile if exist to create an empty one
  52 # only with this data of this run for easier diagnostic
  53 # new one created by write_log function
  54 [ $VERBOSE_MODE -gt 1 -a -f $LOGFILE ] && rm -f $LOGFILE
  55
  56 # TRAP handler
  57 trap "trap_handler 0 \$?" 0     # handle script exit with exit status
  58 trap "trap_handler 1"  1        # SIGHUP        Hangup / reload config
  59 trap "trap_handler 2"  2        # SIGINT        Terminal interrupt
  60 trap "trap_handler 3"  3        # SIGQUIT       Terminal quit
  61 #trap "trap_handler 9"  9       # SIGKILL       no chance to trap
  62 trap "trap_handler 15" 15       # SIGTERM       Termination
  63
  64 ################################################################################
  65 # Leave this comment here, to clearly document variable names that are expected/possible
  66 # Use load_all_config_options to load config options, which is a much more flexible solution.
  67 #
  68 # config_load "ddns"
  69 # config_get <variable> $SECTION_ID <option>
  70 #
  71 # defined options (also used as variable):
  72 #
  73 # enable        self-explanatory
  74 # interface     network interface used by hotplug.d i.e. 'wan' or 'wan6'
  75 #
  76 # service_name  Which DDNS service do you use or "custom"
  77 # update_url    URL to use to update your "custom" DDNS service
  78 # update_script SCRIPT to use to update your "custom" DDNS service
  79 #
  80 # domain        Your DNS name / replace [DOMAIN] in update_url
  81 # username      Username of your DDNS service account / replace [USERNAME] in update_url
  82 # password      Password of your DDNS service account / replace [PASSWORD] in update_url
  83 #
  84 # use_https     use HTTPS to update DDNS service
  85 # cacert        file or directory where HTTPS can find certificates to verify server; 'IGNORE' ignore check of server certificate
  86 #
  87 # use_syslog    log activity to syslog
  88 #
  89 # ip_source     source to detect current local IP ('network' or 'web' or 'script' or 'interface')
  90 # ip_network    local defined network to read IP from i.e. 'wan' or 'wan6'
  91 # ip_url        URL to read local address from i.e. http://checkip.dyndns.com/ or http://checkipv6.dyndns.com/
  92 # ip_script     full path and name of your script to detect local IP
  93 # ip_interface  physical interface to use for detecting
  94 #
  95 # check_interval        check for changes every  !!! checks below 10 minutes make no sense because the Internet
  96 # check_unit            'days' 'hours' 'minutes' !!! needs about 5-10 minutes to sync an IP-change for an DNS entry
  97 #
  98 # force_interval        force to send an update to your service if no change was detected
  99 # force_unit            'days' 'hours' 'minutes' !!! force_interval="0" runs this script once for use i.e. with cron
 100 #
 101 # retry_interval        if error was detected retry in
 102 # retry_unit            'days' 'hours' 'minutes' 'seconds'
 103 # retry_count           number of retries before scripts stops
 104 #
 105 # use_ipv6              detecting/sending IPv6 address
 106 # force_ipversion       force usage of IPv4 or IPv6 for the whole detection and update communication
 107 # dns_server            using a non default dns server to get Registered IP from Internet
 108 # force_dnstcp          force communication with DNS server via TCP instead of default UDP
 109 # proxy                 using a proxy for communication !!! ALSO used to detect local IP via web => return proxy's IP !!!
 110 # use_logfile           self-explanatory "/var/log/ddns/$SECTION_ID.log"
 111 #
 112 # some functionality needs
 113 # - GNU Wget or cURL installed for sending updates to DDNS service
 114 # - BIND host installed to detect Registered IP
 115 #
 116 ################################################################################
 117
 118 # verify and load SECTION_ID is exists
 119 [ "$(uci_get ddns $SECTION_ID)" != "service" ] && {
 120         [ $VERBOSE_MODE -le 1 ] && VERBOSE_MODE=2       # force console out and logfile output
 121         [ -f $LOGFILE ] && rm -f $LOGFILE               # clear logfile before first entry
 122         write_log  7 "************ ************** ************** **************"
 123         write_log  5 "PID '$$' started at $(eval $DATE_PROG)"
 124         write_log  7 "uci configuration:\n$(uci -q show ddns | grep '=service' | sort)"
 125         write_log 14 "Service section '$SECTION_ID' not defined"
 126 }
 127 load_all_config_options "ddns" "$SECTION_ID"
 128
 129 write_log 7 "************ ************** ************** **************"
 130 write_log 5 "PID '$$' started at $(eval $DATE_PROG)"
 131 write_log 7 "uci configuraion:\n$(uci -q show ddns.$SECTION_ID | sort)"
 132 case $VERBOSE_MODE in
 133         0) write_log  7 "verbose mode  : 0 - run normal, NO console output";;
 134         1) write_log  7 "verbose mode  : 1 - run normal, console mode";;
 135         2) write_log  7 "verbose mode  : 2 - run once, NO retry on error";;
 136         3) write_log  7 "verbose mode  : 3 - run once, NO retry on error, NOT sending update";;
 137         *) write_log 14 "error detecting VERBOSE_MODE '$VERBOSE_MODE'";;
 138 esac
 139
 140 # set defaults if not defined
 141 [ -z "$enabled" ]         && enabled=0
 142 [ -z "$retry_count" ]     && retry_count=5
 143 [ -z "$use_syslog" ]      && use_syslog=2       # syslog "Notice"
 144 [ -z "$use_https" ]       && use_https=0        # not use https
 145 [ -z "$use_logfile" ]     && use_logfile=1      # use logfile by default
 146 [ -z "$use_ipv6" ]        && use_ipv6=0         # use IPv4 by default
 147 [ -z "$force_ipversion" ] && force_ipversion=0  # default let system decide
 148 [ -z "$force_dnstcp" ]    && force_dnstcp=0     # default UDP
 149 [ -z "$ip_source" ]       && ip_source="network"
 150 [ "$ip_source" = "network" -a -z "$ip_network" -a $use_ipv6 -eq 0 ] && ip_network="wan"  # IPv4: default wan
 151 [ "$ip_source" = "network" -a -z "$ip_network" -a $use_ipv6 -eq 1 ] && ip_network="wan6" # IPv6: default wan6
 152 [ "$ip_source" = "web" -a -z "$ip_url" -a $use_ipv6 -eq 0 ] && ip_url="http://checkip.dyndns.com"
 153 [ "$ip_source" = "web" -a -z "$ip_url" -a $use_ipv6 -eq 1 ] && ip_url="http://checkipv6.dyndns.com"
 154 [ "$ip_source" = "interface" -a -z "$ip_interface" ] && ip_interface="eth1"
 155
 156 # check enabled state otherwise we don't need to continue
 157 [ $enabled -eq 0 ] && write_log 14 "Service section disabled!"
 158
 159 # without domain or username or password we can do nothing for you
 160 [ -z "$domain" -o -z "$username" -o -z "$password" ] && write_log 14 "Service section not correctly configured!"
 161 urlencode URL_USER "$username"  # encode username, might be email or something like this
 162 urlencode URL_PASS "$password"  # encode password, might have special chars for security reason
 163
 164 # verify ip_source script if configured and executable
 165 if [ "$ip_source" = "script" ]; then
 166         set -- $ip_script       #handling script with parameters, we need a trick
 167         [ -z "$1" ] && write_log 14 "No script defined to detect local IP!"
 168         [ -x "$1" ] || write_log 14 "Script to detect local IP not executable!"
 169 fi
 170
 171 # compute update interval in seconds
 172 get_seconds CHECK_SECONDS ${check_interval:-10} ${check_unit:-"minutes"} # default 10 min
 173 get_seconds FORCE_SECONDS ${force_interval:-72} ${force_unit:-"hours"}   # default 3 days
 174 get_seconds RETRY_SECONDS ${retry_interval:-60} ${retry_unit:-"seconds"} # default 60 sec
 175 [ $CHECK_SECONDS -lt 300 ] && CHECK_SECONDS=300         # minimum 5 minutes
 176 [ $FORCE_SECONDS -gt 0 -a $FORCE_SECONDS -lt $CHECK_SECONDS ] && FORCE_SECONDS=$CHECK_SECONDS   # FORCE_SECONDS >= CHECK_SECONDS or 0
 177 write_log 7 "check interval: $CHECK_SECONDS seconds"
 178 write_log 7 "force interval: $FORCE_SECONDS seconds"
 179 write_log 7 "retry interval: $RETRY_SECONDS seconds"
 180 write_log 7 "retry counter : $retry_count times"
 181
 182 # determine what update url we're using if a service_name is supplied
 183 # otherwise update_url is set inside configuration (custom update url)
 184 # or update_script is set inside configuration (custom update script)
 185 [ -n "$service_name" ] && get_service_data update_url update_script
 186 [ -z "$update_url" -a -z "$update_script" ] && write_log 14 "No update_url found/defined or no update_script found/defined!"
 187 [ -n "$update_script" -a ! -f "$update_script" ] && write_log 14 "Custom update_script not found!"
 188
 189 #kill old process if it exists & set new pid file
 190 stop_section_processes "$SECTION_ID"
 191 [ $? -gt 0 ] && write_log 7 "Send 'SIGTERM' to old process" || write_log 7 "No old process"
 192 echo $$ > $PIDFILE
 193
 194 # determine when the last update was
 195 # the following lines should prevent multiple updates if hotplug fires multiple startups
 196 # as described in Ticket #7820, but did not function if never an update take place
 197 # i.e. after a reboot (/var is linked to /tmp)
 198 # using uptime as reference because date might not be updated via NTP client
 199 get_uptime CURR_TIME
 200 [ -e "$UPDFILE" ] && {
 201         LAST_TIME=$(cat $UPDFILE)
 202         # check also LAST > CURR because link of /var/run to /tmp might be removed
 203         # i.e. boxes with larger filesystems
 204         [ -z "$LAST_TIME" ] && LAST_TIME=0
 205         [ $LAST_TIME -gt $CURR_TIME ] && LAST_TIME=0
 206 }
 207 if [ $LAST_TIME -eq 0 ]; then
 208         write_log 7 "last update: never"
 209 else
 210         EPOCH_TIME=$(( $(date +%s) - CURR_TIME + LAST_TIME ))
 211         EPOCH_TIME="date -d @$EPOCH_TIME +'$DATE_FORMAT'"
 212         write_log 7 "last update: $(eval $EPOCH_TIME)"
 213 fi
 214
 215 # we need time here because hotplug.d is fired by netifd
 216 # but IP addresses are not set by DHCP/DHCPv6 etc.
 217 write_log 7 "Waiting 10 seconds for interfaces to fully come up"
 218 sleep 10 &
 219 PID_SLEEP=$!
 220 wait $PID_SLEEP # enable trap-handler
 221 PID_SLEEP=0
 222
 223 # verify DNS server
 224 [ -n "$dns_server" ] && verify_dns "$dns_server"
 225
 226 # verify Proxy server and set environment
 227 [ -n "$proxy" ] && {
 228         verify_proxy "$proxy" && {
 229                 # everything ok set proxy
 230                 export HTTP_PROXY="http://$proxy"
 231                 export HTTPS_PROXY="http://$proxy"
 232                 export http_proxy="http://$proxy"
 233                 export https_proxy="http://$proxy"
 234         }
 235 }
 236
 237 # let's check if there is already an IP registered at the web
 238 # but ignore errors if not
 239 get_registered_ip REGISTERED_IP "NO_RETRY"
 240
 241 # loop endlessly, checking ip every check_interval and forcing an updating once every force_interval
 242 write_log 6 "Starting main loop at $(eval $DATE_PROG)"
 243 while : ; do
 244
 245         get_local_ip LOCAL_IP           # read local IP
 246
 247         # prepare update
 248         # never updated or forced immediate then NEXT_TIME = 0
 249         [ $FORCE_SECONDS -eq 0 -o $LAST_TIME -eq 0 ] \
 250                 && NEXT_TIME=0 \
 251                 || NEXT_TIME=$(( $LAST_TIME + $FORCE_SECONDS ))
 252
 253         get_uptime CURR_TIME            # get current uptime
 254
 255         # send update when current time > next time or local ip different from registered ip
 256         if [ $CURR_TIME -ge $NEXT_TIME -o "$LOCAL_IP" != "$REGISTERED_IP" ]; then
 257                 if [ $VERBOSE_MODE -gt 2 ]; then
 258                         write_log 7 "Verbose Mode: $VERBOSE_MODE - NO UPDATE send"
 259                 elif [ "$LOCAL_IP" != "$REGISTERED_IP" ]; then
 260                         write_log 7 "Update needed - L: '$LOCAL_IP' <> R: '$REGISTERED_IP'"
 261                 else
 262                         write_log 7 "Forced Update - L: '$LOCAL_IP' == R: '$REGISTERED_IP'"
 263                 fi
 264
 265                 ERR_LAST=0
 266                 [ $VERBOSE_MODE -lt 3 ] && {
 267                         # only send if VERBOSE_MODE < 3
 268                         send_update "$LOCAL_IP"
 269                         ERR_LAST=$?     # save return value
 270                 }
 271
 272                 # error sending local IP to provider
 273                 # we have no communication error (handled inside send_update/do_transfer)
 274                 # but update was not recognized
 275                 # do NOT retry after RETRY_SECONDS, do retry after CHECK_SECONDS
 276                 # to early retrys will block most DDNS provider
 277                 # providers answer is checked inside send_update() function
 278                 if [ $ERR_LAST -eq 0 ]; then
 279                         get_uptime LAST_TIME            # we send update, so
 280                         echo $LAST_TIME > $UPDFILE      # save LASTTIME to file
 281                         [ "$LOCAL_IP" != "$REGISTERED_IP" ] && write_log 6 "Update successful - IP '$LOCAL_IP' send"
 282                         [ "$LOCAL_IP" = "$REGISTERED_IP" ]  || write_log 6 "Forced update successful - IP: '$LOCAL_IP' send"
 283                 else
 284                         write_log 3 "Can not update IP at DDNS Provider"
 285                 fi
 286         fi
 287
 288         # now we wait for check interval before testing if update was recognized
 289         # only sleep if VERBOSE_MODE <= 2 because otherwise nothing was send
 290         [ $VERBOSE_MODE -le 2 ] && {
 291                 write_log 7 "Waiting $CHECK_SECONDS seconds (Check Interval)"
 292                 sleep $CHECK_SECONDS &
 293                 PID_SLEEP=$!
 294                 wait $PID_SLEEP # enable trap-handler
 295                 PID_SLEEP=0
 296         } || write_log 7 "Verbose Mode: $VERBOSE_MODE - NO Check Interval waiting"
 297
 298         REGISTERED_IP=""                # clear variable
 299         get_registered_ip REGISTERED_IP # get registered/public IP
 300
 301         # IP's are still different
 302         if [ "$LOCAL_IP" != "$REGISTERED_IP" ]; then
 303                 if [ $VERBOSE_MODE -le 1 ]; then        # VERBOSE_MODE <=1 then retry
 304                         ERR_UPDATE=$(( $ERR_UPDATE + 1 ))
 305                         [ $retry_count -gt 0 -a $ERR_UPDATE -gt $retry_count ] && \
 306                                 write_log 14 "Updating IP at DDNS provider failed after $retry_count retries"
 307                         write_log 4 "Updating IP at DDNS provider failed - starting retry $ERR_UPDATE/$retry_count"
 308                         continue # loop to beginning
 309                 else
 310                         write_log 4 "Updating IP at DDNS provider failed"
 311                         write_log 7 "Verbose Mode: $VERBOSE_MODE - NO retry"; exit 1
 312                 fi
 313         else
 314                 # we checked successful the last update
 315                 ERR_UPDATE=0                    # reset error counter
 316         fi
 317
 318         # force_update=0 or VERBOSE_MODE > 1 - leave here
 319         [ $VERBOSE_MODE -gt 1 ]  && write_log 7 "Verbose Mode: $VERBOSE_MODE - NO reloop"
 320         [ $FORCE_SECONDS -eq 0 ] && write_log 6 "Configured to run once"
 321         [ $VERBOSE_MODE -gt 1 -o $FORCE_SECONDS -eq 0 ] && exit 0
 322
 323         write_log 6 "Rerun IP check at $(eval $DATE_PROG)"
 324 done
 325 # we should never come here there must be a programming error
 326 write_log 12 "Error in 'dynamic_dns_updater.sh - program coding error"