#!/bin/sh # /usr/lib/ddns/dynamic_dns_functions.sh # #.Distributed under the terms of the GNU General Public License (GPL) version 2.0 # Original written by Eric Paul Bishop, January 2008 # (Loosely) based on the script on the one posted by exobyte in the forums here: # http://forum.openwrt.org/viewtopic.php?id=14040 # extended and partial rewritten #.2014-2016 Christian Schoenebeck # # function timeout # copied from http://www.ict.griffith.edu.au/anthony/software/timeout.sh # @author Anthony Thyssen 6 April 2011 # # variables in small chars are read from /etc/config/ddns # variables in big chars are defined inside these scripts as global vars # variables in big chars beginning with "__" are local defined inside functions only # set -vx #script debugger . /lib/functions.sh . /lib/functions/network.sh # GLOBAL VARIABLES # VERSION="2.6.4-1" SECTION_ID="" # hold config's section name VERBOSE_MODE=1 # default mode is log to console, but easily changed with parameter LOGFILE="" # logfile - all files are set in dynamic_dns_updater.sh PIDFILE="" # pid file UPDFILE="" # store UPTIME of last update DATFILE="" # save stdout data of WGet and other external programs called ERRFILE="" # save stderr output of WGet and other external programs called TLDFILE=/usr/lib/ddns/tld_names.dat.gz # TLD file used by split_FQDN CHECK_SECONDS=0 # calculated seconds out of given FORCE_SECONDS=0 # interval and unit RETRY_SECONDS=0 # in configuration LAST_TIME=0 # holds the uptime of last successful update CURR_TIME=0 # holds the current uptime NEXT_TIME=0 # calculated time for next FORCED update EPOCH_TIME=0 # seconds since 1.1.1970 00:00:00 REGISTERED_IP="" # holds the IP read from DNS LOCAL_IP="" # holds the local IP read from the box URL_USER="" # url encoded $username from config file URL_PASS="" # url encoded $password from config file URL_PENC="" # url encoded $param_enc from config file SRV_ANSWER="" # Answer given by service on success ERR_LAST=0 # used to save $? return code of program and function calls ERR_UPDATE=0 # error counter on different local and registered ip PID_SLEEP=0 # ProcessID of current background "sleep" # allow NON-public IP's ALLOW_LOCAL_IP=$(uci -q get ddns.global.allow_local_ip) || ALLOW_LOCAL_IP=0 # directory to store run information to. RUNDIR=$(uci -q get ddns.global.run_dir) || RUNDIR="/var/run/ddns" [ -d $RUNDIR ] || mkdir -p -m755 $RUNDIR # directory to store log files LOGDIR=$(uci -q get ddns.global.log_dir) || LOGDIR="/var/log/ddns" [ -d $LOGDIR ] || mkdir -p -m755 $LOGDIR # number of lines to before rotate logfile LOGLINES=$(uci -q get ddns.global.log_lines) || LOGLINES=250 LOGLINES=$((LOGLINES + 1)) # correct sed handling # format to show date information in log and luci-app-ddns default ISO 8601 format DATE_FORMAT=$(uci -q get ddns.global.date_format) || DATE_FORMAT="%F %R" DATE_PROG="date +'$DATE_FORMAT'" # regular expression to detect IPv4 / IPv6 # IPv4 0-9 1-3x "." 0-9 1-3x "." 0-9 1-3x "." 0-9 1-3x IPV4_REGEX="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}" # IPv6 ( ( 0-9a-f 1-4char ":") min 1x) ( ( 0-9a-f 1-4char )optional) ( (":" 0-9a-f 1-4char ) min 1x) IPV6_REGEX="\(\([0-9A-Fa-f]\{1,4\}:\)\{1,\}\)\(\([0-9A-Fa-f]\{1,4\}\)\{0,1\}\)\(\(:[0-9A-Fa-f]\{1,4\}\)\{1,\}\)" # detect if called by dynamic_dns_lucihelper.sh script, disable retrys (empty variable == false) [ "$(basename $0)" = "dynamic_dns_lucihelper.sh" ] && LUCI_HELPER="TRUE" || LUCI_HELPER="" # USE_CURL if GNU Wget and cURL installed normally Wget is used by do_transfer() # to change this use global option use_curl '1' USE_CURL=$(uci -q get ddns.global.use_curl) || USE_CURL=0 # read config [ -x /usr/bin/curl ] || USE_CURL=0 # check for cURL # loads all options for a given package and section # also, sets all_option_variables to a list of the variable names # $1 = ddns, $2 = SECTION_ID load_all_config_options() { local __PKGNAME="$1" local __SECTIONID="$2" local __VAR local __ALL_OPTION_VARIABLES="" # this callback loads all the variables in the __SECTIONID section when we do # config_load. We need to redefine the option_cb for different sections # so that the active one isn't still active after we're done with it. For reference # the $1 variable is the name of the option and $2 is the name of the section config_cb() { if [ ."$2" = ."$__SECTIONID" ]; then option_cb() { __ALL_OPTION_VARIABLES="$__ALL_OPTION_VARIABLES $1" } else option_cb() { return 0; } fi } config_load "$__PKGNAME" # Given SECTION_ID not found so no data, so return 1 [ -z "$__ALL_OPTION_VARIABLES" ] && return 1 for __VAR in $__ALL_OPTION_VARIABLES do config_get "$__VAR" "$__SECTIONID" "$__VAR" done return 0 } # read's all service sections from ddns config # $1 = Name of variable to store load_all_service_sections() { local __DATA="" config_cb() { # only look for section type "service", ignore everything else [ "$1" = "service" ] && __DATA="$__DATA $2" } config_load "ddns" eval "$1=\"$__DATA\"" return } # starts updater script for all given sections or only for the one given # $1 = interface (Optional: when given only scripts are started # configured for that interface) # used by /etc/hotplug.d/iface/25-ddns on IFUP # and by /etc/init.d/ddns start start_daemon_for_all_ddns_sections() { local __EVENTIF="$1" local __SECTIONS="" local __SECTIONID="" local __IFACE="" load_all_service_sections __SECTIONS for __SECTIONID in $__SECTIONS; do config_get __IFACE "$__SECTIONID" interface "wan" [ -z "$__EVENTIF" -o "$__IFACE" = "$__EVENTIF" ] || continue /usr/lib/ddns/dynamic_dns_updater.sh $__SECTIONID 0 >/dev/null 2>&1 & done } # stop sections process incl. childs (sleeps) # $1 = section stop_section_processes() { local __PID=0 local __PIDFILE="$RUNDIR/$1.pid" [ $# -ne 1 ] && write_log 12 "Error calling 'stop_section_processes()' - wrong number of parameters" [ -e "$__PIDFILE" ] && { __PID=$(cat $__PIDFILE) ps | grep "^[\t ]*$__PID" >/dev/null 2>&1 && kill $__PID || __PID=0 # terminate it } [ $__PID -eq 0 ] # report if process was running } # stop updater script for all defines sections or only for one given # $1 = interface (optional) # used by /etc/hotplug.d/iface/25-ddns on 'ifdown' # and by /etc/init.d/ddns stop # needed because we also need to kill "sleep" child processes stop_daemon_for_all_ddns_sections() { local __EVENTIF="$1" local __SECTIONS="" local __SECTIONID="" local __IFACE="" load_all_service_sections __SECTIONS for __SECTIONID in $__SECTIONS; do config_get __IFACE "$__SECTIONID" interface "wan" [ -z "$__EVENTIF" -o "$__IFACE" = "$__EVENTIF" ] || continue stop_section_processes "$__SECTIONID" done } # reports to console, logfile, syslog # $1 loglevel 7 == Debug to 0 == EMERG # value +10 will exit the scripts # $2..n text to report write_log() { local __LEVEL __EXIT __CMD __MSG local __TIME=$(date +%H%M%S) [ $1 -ge 10 ] && { __LEVEL=$(($1-10)) __EXIT=1 } || { __LEVEL=$1 __EXIT=0 } shift # remove loglevel [ $__EXIT -eq 0 ] && __MSG="$*" || __MSG="$* - TERMINATE" case $__LEVEL in # create log message and command depending on loglevel 0) __CMD="logger -p user.emerg -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME EMERG : $__MSG" ;; 1) __CMD="logger -p user.alert -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME ALERT : $__MSG" ;; 2) __CMD="logger -p user.crit -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME CRIT : $__MSG" ;; 3) __CMD="logger -p user.err -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME ERROR : $__MSG" ;; 4) __CMD="logger -p user.warn -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME WARN : $__MSG" ;; 5) __CMD="logger -p user.notice -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME note : $__MSG" ;; 6) __CMD="logger -p user.info -t ddns-scripts[$$] $SECTION_ID: $__MSG" __MSG=" $__TIME info : $__MSG" ;; 7) __MSG=" $__TIME : $__MSG";; *) return;; esac # verbose echo [ $VERBOSE_MODE -gt 0 -o $__EXIT -gt 0 ] && echo -e "$__MSG" # write to logfile if [ ${use_logfile:-1} -eq 1 -o $VERBOSE_MODE -gt 1 ]; then echo -e "$__MSG" >> $LOGFILE # VERBOSE_MODE > 1 then NO loop so NO truncate log to $LOGLINES lines [ $VERBOSE_MODE -gt 1 ] || sed -i -e :a -e '$q;N;'$LOGLINES',$D;ba' $LOGFILE fi [ $LUCI_HELPER ] && return # nothing else todo when running LuCI helper script [ $__LEVEL -eq 7 ] && return # no syslog for debug messages __CMD=$(echo -e "$__CMD" | tr -d '\n' | tr '\t' ' ') # remove \n \t chars [ $__EXIT -eq 1 ] && { $__CMD # force syslog before exit exit 1 } [ $use_syslog -eq 0 ] && return [ $((use_syslog + __LEVEL)) -le 7 ] && $__CMD return } # replace all special chars to their %hex value # used for USERNAME and PASSWORD in update_url # unchanged: "-"(minus) "_"(underscore) "."(dot) "~"(tilde) # to verify: "'"(single quote) '"'(double quote) # because shell delimiter # "$"(Dollar) # because used as variable output # tested with the following string stored via Luci Application as password / username # A B!"#AA$1BB%&'()*+,-./:;<=>?@[\]^_`{|}~ without problems at Dollar or quotes urlencode() { # $1 Name of Variable to store encoded string to # $2 string to encode local __STR __LEN __CHAR __OUT local __ENC="" local __POS=1 [ $# -ne 2 ] && write_log 12 "Error calling 'urlencode()' - wrong number of parameters" __STR="$2" # read string to encode __LEN=${#__STR} # get string length while [ $__POS -le $__LEN ]; do # read one chat of the string __CHAR=$(expr substr "$__STR" $__POS 1) case "$__CHAR" in [-_.~a-zA-Z0-9] ) # standard char __OUT="${__CHAR}" ;; * ) # special char get %hex code __OUT=$(printf '%%%02x' "'$__CHAR" ) ;; esac __ENC="${__ENC}${__OUT}" # append to encoded string __POS=$(( $__POS + 1 )) # increment position done eval "$1=\"$__ENC\"" # transfer back to variable return 0 } # extract url or script for given DDNS Provider from # file /usr/lib/ddns/services for IPv4 or from # file /usr/lib/ddns/services_ipv6 for IPv6 # $1 Name of Variable to store url to # $2 Name of Variable to store script to # $3 Name of Variable to store service answer to get_service_data() { [ $# -ne 3 ] && write_log 12 "Error calling 'get_service_data()' - wrong number of parameters" __FILE="/usr/lib/ddns/services" # IPv4 [ $use_ipv6 -ne 0 ] && __FILE="/usr/lib/ddns/services_ipv6" # IPv6 # workaround with variables; pipe create subshell with no give back of variable content mkfifo pipe_$$ # only grep without # or whitespace at linestart | remove " # grep -v -E "(^#|^[[:space:]]*$)" $__FILE | sed -e s/\"//g > pipe_$$ & sed '/^#/d/^[ \t]*$/ds/\"//g' $__FILE > pipe_$$ & while read __SERVICE __DATA __ANSWER; do if [ "$__SERVICE" = "$service_name" ]; then # check if URL or SCRIPT is given __URL=$(echo "$__DATA" | grep "^http") [ -z "$__URL" ] && __SCRIPT="/usr/lib/ddns/$__DATA" eval "$1=\"$__URL\"" eval "$2=\"$__SCRIPT\"" eval "$3=\"$__ANSWER\"" rm pipe_$$ return 0 fi done < pipe_$$ rm pipe_$$ eval "$1=\"\"" # no service match clear variables eval "$2=\"\"" eval "$3=\"\"" return 1 } # Calculate seconds from interval and unit # $1 Name of Variable to store result in # $2 Number and # $3 Unit of time interval get_seconds() { [ $# -ne 3 ] && write_log 12 "Error calling 'get_seconds()' - wrong number of parameters" case "$3" in "days" ) eval "$1=$(( $2 * 86400 ))";; "hours" ) eval "$1=$(( $2 * 3600 ))";; "minutes" ) eval "$1=$(( $2 * 60 ))";; * ) eval "$1=$2";; esac return 0 } timeout() { #.copied from http://www.ict.griffith.edu.au/anthony/software/timeout.sh # only did the following changes # - commented out "#!/bin/bash" and usage section # - replace exit by return for usage as function # - some reformatting # # timeout [-SIG] time [--] command args... # # Run the given command until completion, but kill it if it runs too long. # Specifically designed to exit immediately (no sleep interval) and clean up # nicely without messages or leaving any extra processes when finished. # # Example use # timeout 5 countdown # # Based on notes in my "Shell Script Hints", section "Command Timeout" # http://www.ict.griffith.edu.au/~anthony/info/shell/script.hints # # This script uses a lot of tricks to terminate both the background command, # the timeout script, and even the sleep process. It also includes trap # commands to prevent sub-shells reporting expected "Termination Errors". # # It took years of occasional trials, errors and testing to get a pure bash # timeout command working as well as this does. # #.Anthony Thyssen 6 April 2011 # # PROGNAME=$(type $0 | awk '{print $3}') # search for executable on path # PROGDIR=$(dirname $PROGNAME) # extract directory of program # PROGNAME=$(basename $PROGNAME) # base name of program # output the script comments as docs # Usage() { # echo >&2 "$PROGNAME:" "$@" # sed >&2 -n '/^###/q; /^#/!q; s/^#//; s/^ //; 3s/^/Usage: /; 2,$ p' "$PROGDIR/$PROGNAME" # exit 10; # } SIG=-TERM while [ $# -gt 0 ]; do case "$1" in --) # forced end of user options shift; break ;; # -\?|--help|--doc*) # Usage ;; [0-9]*) TIMEOUT="$1" ;; -*) SIG="$1" ;; *) # unforced end of user options break ;; esac shift # next option done # run main command in backgrounds and get its pid "$@" & command_pid=$! # timeout sub-process abort countdown after ABORT seconds! also backgrounded sleep_pid=0 ( # cleanup sleep process trap 'kill -TERM $sleep_pid; return 1' 1 2 3 15 # sleep timeout period in background sleep $TIMEOUT & sleep_pid=$! wait $sleep_pid # Abort the command kill $SIG $command_pid >/dev/null 2>&1 return 1 ) & timeout_pid=$! # Wait for main command to finished or be timed out wait $command_pid status=$? # Clean up timeout sub-shell - if it is still running! kill $timeout_pid 2>/dev/null wait $timeout_pid 2>/dev/null # Uncomment to check if a LONG sleep still running (no sleep should be) # sleep 1 # echo "-----------" # /bin/ps j # uncomment to show if abort "sleep" is still sleeping return $status } # verify given host and port is connectable # $1 Host/IP to verify # $2 Port to verify verify_host_port() { local __HOST=$1 local __PORT=$2 local __IP __IPV4 __IPV6 __RUNPROG __PROG __ERR # return codes # 1 system specific error # 2 nslookup/host error # 3 nc (netcat) error # 4 unmatched IP version [ $# -ne 2 ] && write_log 12 "Error calling 'verify_host_port()' - wrong number of parameters" # check if ip or FQDN was given __IPV4=$(echo $__HOST | grep -m 1 -o "$IPV4_REGEX$") # do not detect ip in 0.0.0.0.example.com __IPV6=$(echo $__HOST | grep -m 1 -o "$IPV6_REGEX") # if FQDN given get IP address [ -z "$__IPV4" -a -z "$__IPV6" ] && { if [ -n "$(which host)" ]; then # use BIND host if installed __PROG="BIND host" __RUNPROG="$(which host) -t ANY $__HOST >$DATFILE 2>$ERRFILE" else # use BusyBox nslookup __PROG="BusyBox nslookup" __RUNPROG="$(which nslookup) $__HOST >$DATFILE 2>$ERRFILE" fi write_log 7 "#> $__RUNPROG" eval $__RUNPROG __ERR=$? # command error [ $__ERR -gt 0 ] && { write_log 3 "DNS Resolver Error - $__PROG Error '$__ERR'" write_log 7 "$(cat $ERRFILE)" return 2 } # extract IP address if [ -x /usr/bin/host ]; then # use BIND host if installed __IPV4=$(cat $DATFILE | awk -F "address " '/has address/ {print $2; exit}' ) __IPV6=$(cat $DATFILE | awk -F "address " '/has IPv6/ {print $2; exit}' ) else # use BusyBox nslookup __IPV4=$(cat $DATFILE | sed -ne "/^Name:/,\$ { s/^Address[0-9 ]\{0,\}: \($IPV4_REGEX\).*$/\\1/p }") __IPV6=$(cat $DATFILE | sed -ne "/^Name:/,\$ { s/^Address[0-9 ]\{0,\}: \($IPV6_REGEX\).*$/\\1/p }") fi } # check IP version if forced if [ $force_ipversion -ne 0 ]; then __ERR=0 [ $use_ipv6 -eq 0 -a -z "$__IPV4" ] && __ERR=4 [ $use_ipv6 -eq 1 -a -z "$__IPV6" ] && __ERR=6 [ $__ERR -gt 0 ] && { [ $LUCI_HELPER ] && return 4 write_log 14 "Verify host Error '4' - Forced IP Version IPv$__ERR don't match" } fi # verify nc command # busybox nc compiled without -l option "NO OPT l!" -> critical error /usr/bin/nc --help 2>&1 | grep -i "NO OPT l!" >/dev/null 2>&1 && \ write_log 12 "Busybox nc (netcat) compiled without '-l' option, error 'NO OPT l!'" # busybox nc compiled with extensions /usr/bin/nc --help 2>&1 | grep "\-w" >/dev/null 2>&1 && __NCEXT="TRUE" # connectivity test # run busybox nc to HOST PORT # busybox might be compiled with "FEATURE_PREFER_IPV4_ADDRESS=n" # then nc will try to connect via IPv6 if there is any IPv6 available on any host interface # not worrying, if there is an IPv6 wan address # so if not "force_ipversion" to use_ipv6 then connect test via ipv4, if available [ $force_ipversion -ne 0 -a $use_ipv6 -ne 0 -o -z "$__IPV4" ] && __IP=$__IPV6 || __IP=$__IPV4 if [ -n "$__NCEXT" ]; then # BusyBox nc compiled with extensions (timeout support) __RUNPROG="/usr/bin/nc -w 1 $__IP $__PORT $DATFILE 2>$ERRFILE" write_log 7 "#> $__RUNPROG" eval $__RUNPROG __ERR=$? [ $__ERR -eq 0 ] && return 0 write_log 3 "Connect error - BusyBox nc (netcat) Error '$__ERR'" write_log 7 "$(cat $ERRFILE)" return 3 else # nc compiled without extensions (no timeout support) __RUNPROG="timeout 2 -- /usr/bin/nc $__IP $__PORT $DATFILE 2>$ERRFILE" write_log 7 "#> $__RUNPROG" eval $__RUNPROG __ERR=$? [ $__ERR -eq 0 ] && return 0 write_log 3 "Connect error - BusyBox nc (netcat) timeout Error '$__ERR'" return 3 fi } # verify given DNS server if connectable # $1 DNS server to verify verify_dns() { local __ERR=255 # last error buffer local __CNT=0 # error counter [ $# -ne 1 ] && write_log 12 "Error calling 'verify_dns()' - wrong number of parameters" write_log 7 "Verify DNS server '$1'" while [ $__ERR -ne 0 ]; do # DNS uses port 53 verify_host_port "$1" "53" __ERR=$? if [ $LUCI_HELPER ]; then # no retry if called by LuCI helper script return $__ERR elif [ $__ERR -ne 0 -a $VERBOSE_MODE -gt 1 ]; then # VERBOSE_MODE > 1 then NO retry write_log 4 "Verify DNS server '$1' failed - Verbose Mode: $VERBOSE_MODE - NO retry on error" return $__ERR elif [ $__ERR -ne 0 ]; then __CNT=$(( $__CNT + 1 )) # increment error counter # if error count > retry_count leave here [ $retry_count -gt 0 -a $__CNT -gt $retry_count ] && \ write_log 14 "Verify DNS server '$1' failed after $retry_count retries" write_log 4 "Verify DNS server '$1' failed - retry $__CNT/$retry_count in $RETRY_SECONDS seconds" sleep $RETRY_SECONDS & PID_SLEEP=$! wait $PID_SLEEP # enable trap-handler PID_SLEEP=0 fi done return 0 } # analyze and verify given proxy string # $1 Proxy-String to verify verify_proxy() { # complete entry user:password@host:port # inside user and password NO '@' of ":" allowed # host and port only host:port # host only host ERROR unsupported # IPv4 address instead of host 123.234.234.123 # IPv6 address instead of host [xxxx:....:xxxx] in square bracket local __TMP __HOST __PORT local __ERR=255 # last error buffer local __CNT=0 # error counter [ $# -ne 1 ] && write_log 12 "Error calling 'verify_proxy()' - wrong number of parameters" write_log 7 "Verify Proxy server 'http://$1'" # try to split user:password "@" host:port __TMP=$(echo $1 | awk -F "@" '{print $2}') # no "@" found - only host:port is given [ -z "$__TMP" ] && __TMP="$1" # now lets check for IPv6 address __HOST=$(echo $__TMP | grep -m 1 -o "$IPV6_REGEX") # IPv6 host address found read port if [ -n "$__HOST" ]; then # IPv6 split at "]:" __PORT=$(echo $__TMP | awk -F "]:" '{print $2}') else __HOST=$(echo $__TMP | awk -F ":" '{print $1}') __PORT=$(echo $__TMP | awk -F ":" '{print $2}') fi # No Port detected - EXITING [ -z "$__PORT" ] && { [ $LUCI_HELPER ] && return 5 write_log 14 "Invalid Proxy server Error '5' - proxy port missing" } while [ $__ERR -gt 0 ]; do verify_host_port "$__HOST" "$__PORT" __ERR=$? if [ $LUCI_HELPER ]; then # no retry if called by LuCI helper script return $__ERR elif [ $__ERR -gt 0 -a $VERBOSE_MODE -gt 1 ]; then # VERBOSE_MODE > 1 then NO retry write_log 4 "Verify Proxy server '$1' failed - Verbose Mode: $VERBOSE_MODE - NO retry on error" return $__ERR elif [ $__ERR -gt 0 ]; then __CNT=$(( $__CNT + 1 )) # increment error counter # if error count > retry_count leave here [ $retry_count -gt 0 -a $__CNT -gt $retry_count ] && \ write_log 14 "Verify Proxy server '$1' failed after $retry_count retries" write_log 4 "Verify Proxy server '$1' failed - retry $__CNT/$retry_count in $RETRY_SECONDS seconds" sleep $RETRY_SECONDS & PID_SLEEP=$! wait $PID_SLEEP # enable trap-handler PID_SLEEP=0 fi done return 0 } do_transfer() { # $1 # URL to use local __URL="$1" local __ERR=0 local __CNT=0 # error counter local __PROG __RUNPROG [ $# -ne 1 ] && write_log 12 "Error in 'do_transfer()' - wrong number of parameters" # lets prefer GNU Wget because it does all for us - IPv4/IPv6/HTTPS/PROXY/force IP version if [ -n "$(which wget-ssl)" -a $USE_CURL -eq 0 ]; then # except global option use_curl is set to "1" __PROG="$(which wget-ssl) -nv -t 1 -O $DATFILE -o $ERRFILE" # non_verbose no_retry outfile errfile # force network/ip to use for communication if [ -n "$bind_network" ]; then local __BINDIP # set correct program to detect IP [ $use_ipv6 -eq 0 ] && __RUNPROG="network_get_ipaddr" || __RUNPROG="network_get_ipaddr6" eval "$__RUNPROG __BINDIP $bind_network" || \ write_log 13 "Can not detect local IP using '$__RUNPROG $bind_network' - Error: '$?'" write_log 7 "Force communication via IP '$__BINDIP'" __PROG="$__PROG --bind-address=$__BINDIP" fi # force ip version to use if [ $force_ipversion -eq 1 ]; then [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -4" || __PROG="$__PROG -6" # force IPv4/IPv6 fi # set certificate parameters if [ $use_https -eq 1 ]; then if [ "$cacert" = "IGNORE" ]; then # idea from Ticket #15327 to ignore server cert __PROG="$__PROG --no-check-certificate" elif [ -f "$cacert" ]; then __PROG="$__PROG --ca-certificate=${cacert}" elif [ -d "$cacert" ]; then __PROG="$__PROG --ca-directory=${cacert}" elif [ -n "$cacert" ]; then # it's not a file and not a directory but given write_log 14 "No valid certificate(s) found at '$cacert' for HTTPS communication" fi fi # disable proxy if no set (there might be .wgetrc or .curlrc or wrong environment set) [ -z "$proxy" ] && __PROG="$__PROG --no-proxy" __RUNPROG="$__PROG '$__URL'" # build final command __PROG="GNU Wget" # reuse for error logging # 2nd choice is cURL IPv4/IPv6/HTTPS # libcurl might be compiled without Proxy or HTTPS Support elif [ -n "$(which curl)" ]; then __PROG="$(which curl) -RsS -o $DATFILE --stderr $ERRFILE" # check HTTPS support /usr/bin/curl -V | grep "Protocols:" | grep -F "https" >/dev/null 2>&1 [ $? -eq 1 -a $use_https -eq 1 ] && \ write_log 13 "cURL: libcurl compiled without https support" # force network/interface-device to use for communication if [ -n "$bind_network" ]; then local __DEVICE network_get_physdev __DEVICE $bind_network || \ write_log 13 "Can not detect local device using 'network_get_physdev $bind_network' - Error: '$?'" write_log 7 "Force communication via device '$__DEVICE'" __PROG="$__PROG --interface $__DEVICE" fi # force ip version to use if [ $force_ipversion -eq 1 ]; then [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -4" || __PROG="$__PROG -6" # force IPv4/IPv6 fi # set certificate parameters if [ $use_https -eq 1 ]; then if [ "$cacert" = "IGNORE" ]; then # idea from Ticket #15327 to ignore server cert __PROG="$__PROG --insecure" # but not empty better to use "IGNORE" elif [ -f "$cacert" ]; then __PROG="$__PROG --cacert $cacert" elif [ -d "$cacert" ]; then __PROG="$__PROG --capath $cacert" elif [ -n "$cacert" ]; then # it's not a file and not a directory but given write_log 14 "No valid certificate(s) found at '$cacert' for HTTPS communication" fi fi # disable proxy if no set (there might be .wgetrc or .curlrc or wrong environment set) # or check if libcurl compiled with proxy support if [ -z "$proxy" ]; then __PROG="$__PROG --noproxy '*'" else # if libcurl has no proxy support and proxy should be used then force ERROR # libcurl currently no proxy support by default grep -i "all_proxy" /usr/lib/libcurl.so* >/dev/null 2>&1 || \ write_log 13 "cURL: libcurl compiled without Proxy support" fi __RUNPROG="$__PROG '$__URL'" # build final command __PROG="cURL" # reuse for error logging # uclient-fetch possibly with ssl support if /lib/libustream-ssl.so installed elif [ -n "$(which uclient-fetch)" ]; then __PROG="$(which uclient-fetch) -q -O $DATFILE" # force network/ip not supported [ -n "$__BINDIP" ] && \ write_log 14 "uclient-fetch: FORCE binding to specific address not supported" # force ip version to use if [ $force_ipversion -eq 1 ]; then [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -4" || __PROG="$__PROG -6" # force IPv4/IPv6 fi # https possibly not supported [ $use_https -eq 1 -a ! -f /lib/libustream-ssl.so ] && \ write_log 14 "uclient-fetch: no HTTPS support! Additional install one of ustream-ssl packages" # proxy support [ -z "$proxy" ] && __PROG="$__PROG -Y off" || __PROG="$__PROG -Y on" # https & certificates if [ $use_https -eq 1 ]; then if [ "$cacert" = "IGNORE" ]; then __PROG="$__PROG --no-check-certificate" elif [ -f "$cacert" ]; then __PROG="$__PROG --ca-certificate=$cacert" elif [ -n "$cacert" ]; then # it's not a file; nothing else supported write_log 14 "No valid certificate file '$cacert' for HTTPS communication" fi fi __RUNPROG="$__PROG '$__URL' 2>$ERRFILE" # build final command __PROG="uclient-fetch" # reuse for error logging # Busybox Wget or any other wget in search $PATH (did not support neither IPv6 nor HTTPS) elif [ -n "$(which wget)" ]; then __PROG="$(which wget) -q -O $DATFILE" # force network/ip not supported [ -n "$__BINDIP" ] && \ write_log 14 "BusyBox Wget: FORCE binding to specific address not supported" # force ip version not supported [ $force_ipversion -eq 1 ] && \ write_log 14 "BusyBox Wget: Force connecting to IPv4 or IPv6 addresses not supported" # https not supported [ $use_https -eq 1 ] && \ write_log 14 "BusyBox Wget: no HTTPS support" # disable proxy if no set (there might be .wgetrc or .curlrc or wrong environment set) [ -z "$proxy" ] && __PROG="$__PROG -Y off" __RUNPROG="$__PROG '$__URL' 2>$ERRFILE" # build final command __PROG="Busybox Wget" # reuse for error logging else write_log 13 "Neither 'Wget' nor 'cURL' nor 'uclient-fetch' installed or executable" fi while : ; do write_log 7 "#> $__RUNPROG" eval $__RUNPROG # DO transfer __ERR=$? # save error code [ $__ERR -eq 0 ] && return 0 # no error leave [ $LUCI_HELPER ] && return 1 # no retry if called by LuCI helper script write_log 3 "$__PROG Error: '$__ERR'" write_log 7 "$(cat $ERRFILE)" # report error [ $VERBOSE_MODE -gt 1 ] && { # VERBOSE_MODE > 1 then NO retry write_log 4 "Transfer failed - Verbose Mode: $VERBOSE_MODE - NO retry on error" return 1 } __CNT=$(( $__CNT + 1 )) # increment error counter # if error count > retry_count leave here [ $retry_count -gt 0 -a $__CNT -gt $retry_count ] && \ write_log 14 "Transfer failed after $retry_count retries" write_log 4 "Transfer failed - retry $__CNT/$retry_count in $RETRY_SECONDS seconds" sleep $RETRY_SECONDS & PID_SLEEP=$! wait $PID_SLEEP # enable trap-handler PID_SLEEP=0 done # we should never come here there must be a programming error write_log 12 "Error in 'do_transfer()' - program coding error" } send_update() { # $1 # IP to set at DDNS service provider local __IP [ $# -ne 1 ] && write_log 12 "Error calling 'send_update()' - wrong number of parameters" if [ $ALLOW_LOCAL_IP -eq 0 ]; then # verify given IP / no private IPv4's / no IPv6 addr starting with fxxx of with ":" [ $use_ipv6 -eq 0 ] && __IP=$(echo $1 | grep -v -E "(^0|^10\.|^100\.6[4-9]\.|^100\.[7-9][0-9]\.|^100\.1[0-1][0-9]\.|^100\.12[0-7]\.|^127|^169\.254|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-1]\.|^192\.168)") [ $use_ipv6 -eq 1 ] && __IP=$(echo $1 | grep "^[0-9a-eA-E]") [ -z "$__IP" ] && write_log 14 "Private or invalid or no IP '$1' given! Please check your configuration" else __IP="$1" fi if [ -n "$update_script" ]; then write_log 7 "parsing script '$update_script'" . $update_script else local __URL __ERR # do replaces in URL __URL=$(echo $update_url | sed -e "s#\[USERNAME\]#$URL_USER#g" -e "s#\[PASSWORD\]#$URL_PASS#g" \ -e "s#\[PARAMENC\]#$URL_PENC#g" -e "s#\[PARAMOPT\]#$param_opt#g" \ -e "s#\[DOMAIN\]#$domain#g" -e "s#\[IP\]#$__IP#g") [ $use_https -ne 0 ] && __URL=$(echo $__URL | sed -e 's#^http:#https:#') do_transfer "$__URL" || return 1 write_log 7 "DDNS Provider answered:\n$(cat $DATFILE)" [ -z "$SRV_ANSWER" ] && return 0 # not set then ignore grep -i -E "$SRV_ANSWER" $DATFILE >/dev/null 2>&1 return $? # "0" if found fi } get_local_ip () { # $1 Name of Variable to store local IP (LOCAL_IP) local __CNT=0 # error counter local __RUNPROG __DATA __URL __ERR [ $# -ne 1 ] && write_log 12 "Error calling 'get_local_ip()' - wrong number of parameters" write_log 7 "Detect local IP on '$ip_source'" while : ; do case $ip_source in network) # set correct program [ $use_ipv6 -eq 0 ] && __RUNPROG="network_get_ipaddr" \ || __RUNPROG="network_get_ipaddr6" eval "$__RUNPROG __DATA $ip_network" || \ write_log 13 "Can not detect local IP using $__RUNPROG '$ip_network' - Error: '$?'" [ -n "$__DATA" ] && write_log 7 "Local IP '$__DATA' detected on network '$ip_network'" ;; interface) write_log 7 "#> ifconfig $ip_interface >$DATFILE 2>$ERRFILE" ifconfig $ip_interface >$DATFILE 2>$ERRFILE __ERR=$? if [ $__ERR -eq 0 ]; then if [ $use_ipv6 -eq 0 ]; then __DATA=$(awk ' /inet addr:/ { # Filter IPv4 # inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0 $1=""; # remove inet $3=""; # remove Bcast: ... $4=""; # remove Mask: ... FS=":"; # separator ":" $0=$0; # reread to activate separator $1=""; # remove addr FS=" "; # set back separator to default " " $0=$0; # reread to activate separator (remove whitespaces) print $1; # print IPv4 addr }' $DATFILE ) else __DATA=$(awk ' /inet6/ && /: [0-9a-eA-E]/ { # Filter IPv6 exclude fxxx # inet6 addr: 2001:db8::xxxx:xxxx/32 Scope:Global FS="/"; # separator "/" $0=$0; # reread to activate separator $2=""; # remove everything behind "/" FS=" "; # set back separator to default " " $0=$0; # reread to activate separator print $3; # print IPv6 addr }' $DATFILE ) fi [ -n "$__DATA" ] && write_log 7 "Local IP '$__DATA' detected on interface '$ip_interface'" else write_log 3 "ifconfig Error: '$__ERR'" write_log 7 "$(cat $ERRFILE)" # report error fi ;; script) write_log 7 "#> $ip_script >$DATFILE 2>$ERRFILE" eval $ip_script >$DATFILE 2>$ERRFILE __ERR=$? if [ $__ERR -eq 0 ]; then __DATA=$(cat $DATFILE) [ -n "$__DATA" ] && write_log 7 "Local IP '$__DATA' detected via script '$ip_script'" else write_log 3 "$ip_script Error: '$__ERR'" write_log 7 "$(cat $ERRFILE)" # report error fi ;; web) do_transfer "$ip_url" # use correct regular expression [ $use_ipv6 -eq 0 ] \ && __DATA=$(grep -m 1 -o "$IPV4_REGEX" $DATFILE) \ || __DATA=$(grep -m 1 -o "$IPV6_REGEX" $DATFILE) [ -n "$__DATA" ] && write_log 7 "Local IP '$__DATA' detected on web at '$ip_url'" ;; *) write_log 12 "Error in 'get_local_ip()' - unhandled ip_source '$ip_source'" ;; esac # valid data found return here [ -n "$__DATA" ] && { eval "$1=\"$__DATA\"" return 0 } [ $LUCI_HELPER ] && return 1 # no retry if called by LuCI helper script write_log 7 "Data detected:\n$(cat $DATFILE)" [ $VERBOSE_MODE -gt 1 ] && { # VERBOSE_MODE > 1 then NO retry write_log 4 "Get local IP via '$ip_source' failed - Verbose Mode: $VERBOSE_MODE - NO retry on error" return 1 } __CNT=$(( $__CNT + 1 )) # increment error counter # if error count > retry_count leave here [ $retry_count -gt 0 -a $__CNT -gt $retry_count ] && \ write_log 14 "Get local IP via '$ip_source' failed after $retry_count retries" write_log 4 "Get local IP via '$ip_source' failed - retry $__CNT/$retry_count in $RETRY_SECONDS seconds" sleep $RETRY_SECONDS & PID_SLEEP=$! wait $PID_SLEEP # enable trap-handler PID_SLEEP=0 done # we should never come here there must be a programming error write_log 12 "Error in 'get_local_ip()' - program coding error" } get_registered_ip() { # $1 Name of Variable to store public IP (REGISTERED_IP) # $2 (optional) if set, do not retry on error local __CNT=0 # error counter local __ERR=255 local __REGEX __PROG __RUNPROG __DATA __IP local __MUSL=$(nslookup localhost 2>&1 | grep -qF "(null)"; echo $?) # 0 == busybox compiled with musl "(null)" found # return codes # 1 no IP detected [ $# -lt 1 -o $# -gt 2 ] && write_log 12 "Error calling 'get_registered_ip()' - wrong number of parameters" [ $is_glue -eq 1 -a -z "$(which host)" ] && write_log 14 "Lookup of glue records is only supported using BIND host" write_log 7 "Detect registered/public IP" # set correct regular expression [ $use_ipv6 -eq 0 ] && __REGEX="$IPV4_REGEX" || __REGEX="$IPV6_REGEX" if [ -n "$(which host)" ]; then __PROG="$(which host)" [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -t A" || __PROG="$__PROG -t AAAA" if [ $force_ipversion -eq 1 ]; then # force IP version [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -4" || __PROG="$__PROG -6" fi [ $force_dnstcp -eq 1 ] && __PROG="$__PROG -T" # force TCP [ $is_glue -eq 1 ] && __PROG="$__PROG -v" # use verbose output to get additional section __RUNPROG="$__PROG $lookup_host $dns_server >$DATFILE 2>$ERRFILE" __PROG="BIND host" elif [ -n "$(which khost)" ]; then __PROG="$(which khost)" [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -t A" || __PROG="$__PROG -t AAAA" if [ $force_ipversion -eq 1 ]; then # force IP version [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -4" || __PROG="$__PROG -6" fi [ $force_dnstcp -eq 1 ] && __PROG="$__PROG -T" # force TCP __RUNPROG="$__PROG $lookup_host $dns_server >$DATFILE 2>$ERRFILE" __PROG="Knot host" elif [ -n "$(which drill)" ]; then __PROG="$(which drill) -V0" # drill options name @server type if [ $force_ipversion -eq 1 ]; then # force IP version [ $use_ipv6 -eq 0 ] && __PROG="$__PROG -4" || __PROG="$__PROG -6" fi [ $force_dnstcp -eq 1 ] && __PROG="$__PROG -t" || __PROG="$__PROG -u" # force TCP __PROG="$__PROG $lookup_host" [ -n "$dns_server" ] && __PROG="$__PROG @$dns_server" [ $use_ipv6 -eq 0 ] && __PROG="$__PROG A" || __PROG="$__PROG AAAA" __RUNPROG="$__PROG >$DATFILE 2>$ERRFILE" __PROG="drill" elif [ -n "$(which hostip)" ]; then # hostip package installed __PROG="$(which hostip)" [ $force_dnstcp -ne 0 ] && \ write_log 14 "hostip - no support for 'DNS over TCP'" # is IP given as dns_server ? __IP=$(echo $dns_server | grep -m 1 -o "$IPV4_REGEX") [ -z "$__IP" ] && __IP=$(echo $dns_server | grep -m 1 -o "$IPV6_REGEX") # we got NO ip for dns_server, so build command [ -z "$__IP" -a -n "$dns_server" ] && { __IP="\`/usr/bin/hostip" [ $use_ipv6 -eq 1 -a $force_ipversion -eq 1 ] && __IP="$__IP -6" __IP="$__IP $dns_server | grep -m 1 -o" [ $use_ipv6 -eq 1 -a $force_ipversion -eq 1 ] \ && __IP="$__IP '$IPV6_REGEX'" \ || __IP="$__IP '$IPV4_REGEX'" __IP="$__IP \`" } [ $use_ipv6 -eq 1 ] && __PROG="$__PROG -6" [ -n "$dns_server" ] && __PROG="$__PROG -r $__IP" __RUNPROG="$__PROG $lookup_host >$DATFILE 2>$ERRFILE" __PROG="hostip" elif [ -n "$(which nslookup)" ]; then # last use BusyBox nslookup [ $force_ipversion -ne 0 -o $force_dnstcp -ne 0 ] && \ write_log 14 "Busybox nslookup - no support to 'force IP Version' or 'DNS over TCP'" [ $__MUSL -eq 0 -a -n "$dns_server" ] && \ write_log 14 "Busybox compiled with musl - nslookup - no support to set/use DNS Server" __RUNPROG="$(which nslookup) $lookup_host $dns_server >$DATFILE 2>$ERRFILE" __PROG="BusyBox nslookup" else # there must be an error write_log 12 "Error in 'get_registered_ip()' - no supported Name Server lookup software accessible" fi while : ; do write_log 7 "#> $__RUNPROG" eval $__RUNPROG __ERR=$? if [ $__ERR -ne 0 ]; then write_log 3 "$__PROG error: '$__ERR'" write_log 7 "$(cat $ERRFILE)" else if [ "$__PROG" = "BIND host" ]; then if [ $is_glue -eq 1 ]; then __DATA=$(cat $DATFILE | grep "^$lookup_host" | grep -m 1 -o "$__REGEX" ) else __DATA=$(cat $DATFILE | awk -F "address " '/has/ {print $2; exit}' ) fi elif [ "$__PROG" = "Knot host" ]; then __DATA=$(cat $DATFILE | awk -F "address " '/has/ {print $2; exit}' ) elif [ "$__PROG" = "drill" ]; then __DATA=$(cat $DATFILE | awk '/^'"$lookup_host"'/ {print $5; exit}' ) elif [ "$__PROG" = "hostip" ]; then __DATA=$(cat $DATFILE | grep -m 1 -o "$__REGEX") else __DATA=$(cat $DATFILE | sed -ne "/^Name:/,\$ { s/^Address[0-9 ]\{0,\}: \($__REGEX\).*$/\\1/p }" ) fi [ -n "$__DATA" ] && { write_log 7 "Registered IP '$__DATA' detected" eval "$1=\"$__DATA\"" # valid data found return 0 # leave here } write_log 4 "NO valid IP found" __ERR=127 fi [ $LUCI_HELPER ] && return $__ERR # no retry if called by LuCI helper script [ -n "$2" ] && return $__ERR # $2 is given -> no retry [ $VERBOSE_MODE -gt 1 ] && { # VERBOSE_MODE > 1 then NO retry write_log 4 "Get registered/public IP for '$lookup_host' failed - Verbose Mode: $VERBOSE_MODE - NO retry on error" return $__ERR } __CNT=$(( $__CNT + 1 )) # increment error counter # if error count > retry_count leave here [ $retry_count -gt 0 -a $__CNT -gt $retry_count ] && \ write_log 14 "Get registered/public IP for '$lookup_host' failed after $retry_count retries" write_log 4 "Get registered/public IP for '$lookup_host' failed - retry $__CNT/$retry_count in $RETRY_SECONDS seconds" sleep $RETRY_SECONDS & PID_SLEEP=$! wait $PID_SLEEP # enable trap-handler PID_SLEEP=0 done # we should never come here there must be a programming error write_log 12 "Error in 'get_registered_ip()' - program coding error" } get_uptime() { # $1 Variable to store result in [ $# -ne 1 ] && write_log 12 "Error calling 'verify_host_port()' - wrong number of parameters" local __UPTIME=$(cat /proc/uptime) eval "$1=\"${__UPTIME%%.*}\"" } trap_handler() { # $1 trap signal # $2 optional (exit status) local __PIDS __PID local __ERR=${2:-0} local __OLD_IFS=$IFS local __NEWLINE_IFS=' ' # __NEWLINE_IFS [ $PID_SLEEP -ne 0 ] && kill -$1 $PID_SLEEP 2>/dev/null # kill pending sleep if exist case $1 in 0) if [ $__ERR -eq 0 ]; then write_log 5 "PID '$$' exit normal at $(eval $DATE_PROG)\n" else write_log 4 "PID '$$' exit WITH ERROR '$__ERR' at $(eval $DATE_PROG)\n" fi ;; 1) write_log 6 "PID '$$' received 'SIGHUP' at $(eval $DATE_PROG)" # reload config via starting the script again eval "/usr/lib/ddns/dynamic_dns_updater.sh $SECTION_ID $VERBOSE_MODE &" exit 0 ;; # and leave this one 2) write_log 5 "PID '$$' terminated by 'SIGINT' at $(eval $DATE_PROG)\n";; 3) write_log 5 "PID '$$' terminated by 'SIGQUIT' at $(eval $DATE_PROG)\n";; 15) write_log 5 "PID '$$' terminated by 'SIGTERM' at $(eval $DATE_PROG)\n";; *) write_log 13 "Unhandled signal '$1' in 'trap_handler()'";; esac __PIDS=$(pgrep -P $$) # get my childs (pgrep prints with "newline") IFS=$__NEWLINE_IFS for __PID in $__PIDS; do kill -$1 $__PID # terminate it done IFS=$__OLD_IFS # remove out and err file [ -f $DATFILE ] && rm -f $DATFILE [ -f $ERRFILE ] && rm -f $ERRFILE # exit with correct handling: # remove trap handling settings and send kill to myself trap - 0 1 2 3 15 [ $1 -gt 0 ] && kill -$1 $$ } split_FQDN() { # $1 FQDN to split # $2 name of variable to store TLD # $3 name of variable to store (reg)Domain # $4 name of variable to store Host/Subdomain [ $# -ne 4 ] && write_log 12 "Error calling 'split_FQDN()' - wrong number of parameters" [ -z "$1" ] && write_log 12 "Error calling 'split_FQDN()' - missing FQDN to split" [ -f $TLDFILE ] || write_log 12 "Error calling 'split_FQDN()' - missing file '$TLDFILE'" local _HOST _FDOM _CTLD _FTLD local _SET="$@" # save given function parameters local _PAR=$(echo "$1" | tr [A-Z] [a-z] | tr "." " ") # to lower and replace DOT with SPACE set -- $_PAR # set new as function parameters _PAR="" # clear variable for later reuse while [ -n "$1" ] ; do # as long we have parameters _PAR="$1 $_PAR" # invert order of parameters shift done set -- $_PAR # use new as function parameters _PAR="" # clear variable while [ -n "$1" ] ; do # as long we have parameters if [ -z "$_CTLD" ]; then # first loop _CTLD="$1" # CURRENT TLD to look at shift else _CTLD="$1.$_CTLD" # Next TLD to look at shift fi # check if TLD exact match in tld_names.dat, save TLD zcat $TLDFILE | grep -E "^$_CTLD$" >/dev/null 2>&1 && { _FTLD="$_CTLD" # save found _FDOM="$1" # save domain next step might be invalid continue } # check if match any "*" in tld_names.dat, zcat $TLDFILE | grep -E "^\*.$_CTLD$" >/dev/null 2>&1 && { [ -z "$1" ] && break # no more data break # check if next level TLD match excludes "!" in tld_names.dat if zcat $TLDFILE | grep -E "^!$1.$_CTLD$" >/dev/null 2>&1 ; then _FTLD="$_CTLD" # Yes else _FTLD="$1.$_CTLD" shift fi _FDOM="$1"; shift } [ -n "$_FTLD" ] && break # we have something valid, break done # the leftover parameters are the HOST/SUBDOMAIN while [ -n "$1" ]; do _HOST="$1 $_HOST" # remember we need to invert shift done _HOST=$(echo $_HOST | tr " " ".") # insert DOT set -- $_SET # set back parameters from function call [ -n "$_FTLD" ] && { eval "$2=$_FTLD" # set TLD eval "$3=$_FDOM" # set registrable domain eval "$4=$_HOST" # set HOST/SUBDOMAIN return 0 } eval "$2=''" # clear TLD eval "$3=''" # clear registrable domain eval "$4=''" # clear HOST/SUBDOMAIN return 1 } expand_ipv6() { # Original written for bash by # Author: Florian Streibelt # Date: 08.04.2012 # License: Public Domain, but please be fair and # attribute the original author(s) and provide # a link to the original source for corrections: #. https://github.com/mutax/IPv6-Address-checks # $1 IPv6 t0 expand # $2 name of variable to store expanded IPv6 [ $# -ne 2 ] && write_log 12 "Error calling 'expand_ipv6()' - wrong number of parameters" INPUT="$(echo "$1" | tr 'A-F' 'a-f')" [ "$INPUT" = "::" ] && INPUT="::0" # special case :: O="" while [ "$O" != "$INPUT" ]; do O="$INPUT" # fill all words with zeroes INPUT=$( echo "$INPUT" | sed -e 's|:\([0-9a-f]\{3\}\):|:0\1:|g' \ -e 's|:\([0-9a-f]\{3\}\)$|:0\1|g' \ -e 's|^\([0-9a-f]\{3\}\):|0\1:|g' \ -e 's|:\([0-9a-f]\{2\}\):|:00\1:|g' \ -e 's|:\([0-9a-f]\{2\}\)$|:00\1|g' \ -e 's|^\([0-9a-f]\{2\}\):|00\1:|g' \ -e 's|:\([0-9a-f]\):|:000\1:|g' \ -e 's|:\([0-9a-f]\)$|:000\1|g' \ -e 's|^\([0-9a-f]\):|000\1:|g' ) done # now expand the :: ZEROES="" echo "$INPUT" | grep -qs "::" if [ "$?" -eq 0 ]; then GRPS="$( echo "$INPUT" | sed 's|[0-9a-f]||g' | wc -m )" GRPS=$(( GRPS-1 )) # remove carriage return MISSING=$(( 8-GRPS )) while [ $MISSING -gt 0 ]; do ZEROES="$ZEROES:0000" MISSING=$(( MISSING-1 )) done # be careful where to place the : INPUT=$( echo "$INPUT" | sed -e 's|\(.\)::\(.\)|\1'$ZEROES':\2|g' \ -e 's|\(.\)::$|\1'$ZEROES':0000|g' \ -e 's|^::\(.\)|'$ZEROES':0000:\1|g;s|^:||g' ) fi # an expanded address has 39 chars + CR if [ $(echo $INPUT | wc -m) != 40 ]; then write_log 4 "Error in 'expand_ipv6()' - invalid IPv6 found: '$1' expanded: '$INPUT'" eval "$2='invalid'" return 1 fi # echo the fully expanded version of the address eval "$2=$INPUT" return 0 }