122 lines
2.9 KiB
Text
122 lines
2.9 KiB
Text
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#!/usr/bin/env bash
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set -e;
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usage() {
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USAGE=$(cat <<EOF
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Usage: dynv6 [CONFIG_FILE (absolute path)]
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If no CONFIG_FILE is given, HOME/.dynv6.conf is used. This fallback option
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has to exist or the script will exit.
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Configuration can be done in any file and any pre-defined variable can be overwritten.
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The following are at least required for the script to work:
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- DYNV6_MAIL_ENABLED= // if notify via mail
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- DYNV6_MAIL_ADDRESS="" // (optional) mail.rc has to be configured
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- DYNV6_TOKEN="" // the dynv6 token
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- DYNV6_HOSTNAME="" // the dynv6 hostname
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- DYNV6_DEVICE="" // the (optional) dynv6 device
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- DYNV6_NETMASK="" // the (optional) netmask
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You can copy this script to '/usr/local/bin' and use create a custom CONFIG_FILE as user. Examples can be found in '/usr/share/doc/<scriptname>'.
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EOF
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)
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echo "$USAGE";
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}
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# check for config file
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source_config() {
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local config=$1;
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local configFallback=$2;
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if [[ ! -f "$config" ]]; then
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if [[ ! -f "$configFallback" ]]; then
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echo "No config file specified and could not find default in '$configFallback'!";
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echo "";
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usage;
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exit 1;
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else
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config=$configFallback;
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fi
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fi
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set -a;
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source "$config";
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set +a;
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}
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apply_defaults() {
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[[ -z ${DYNV6_MAIL_ENABLED} ]] && DYNV6_MAIL_ENABLED=false;
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}
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check_required() {
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if [[ -z ${DYNV6_TOKEN} ]]; then
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echo "DYNV6_TOKEN is required"
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exit 1;
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fi
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if [[ -z ${DYNV6_HOSTNAME} ]]; then
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echo "DYNV6_HOSTNAME is required"
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exit 1;
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fi
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if [ -e /usr/bin/curl ]; then
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bin="curl -fsS"
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elif [ -e /usr/bin/wget ]; then
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bin="wget -O-"
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else
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echo "neither curl nor wget found"
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exit 1
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fi
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}
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# check requirements
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CONFIG_FILE="$1";
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FALLBACK_CONFIG_FILE="${HOME}/.dynv6.conf";
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source_config "${CONFIG_FILE}" "${FALLBACK_CONFIG_FILE}";
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apply_defaults;
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check_required;
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# DO NOT CHANGE
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token=${DYNV6_TOKEN}
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hostname=${DYNV6_HOSTNAME}
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device=${DYNV6_DEVICE}
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netmask=${DYNV6_NETMASK}
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file=$HOME/.dynv6.addr6
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[ -e $file ] && old=`cat $file`
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if [ -z "$netmask" ]; then
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netmask=128
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fi
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if [ -n "$device" ]; then
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device="dev $device"
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fi
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address=$(ip -6 addr list scope global $device | grep -v " fd" | sed -n 's/.*inet6 \([0-9a-f:]\+\).*/\1/p' | head -n 1)
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if [ -z "$address" ]; then
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echo "no IPv6 address found"
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exit 1
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fi
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# address with netmask
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current=$address/$netmask
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if [ "$old" = "$current" ]; then
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echo "IPv6 address unchanged"
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exit
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fi
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# send addresses to dynv6
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$bin "http://dynv6.com/api/update?hostname=$hostname&ipv6=$current&token=$token"
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$bin "http://ipv4.dynv6.com/api/update?hostname=$hostname&ipv4=auto&token=$token"
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# save current address
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echo $current > $file
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# sent mail that IP changed
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if [ "${DYNV6_MAIL_ENABLED}" = true ]; then
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HOSTMACHINE=$(hostname)
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echo -e "IP for ${hostname} changed from '${old}' to '${address}' on host ${HOSTMACHINE}" | mailx -s "[dynv6 ${HOSTMACHINE}] IP changed for ${hostname}" "${DYNV6_MAIL_ADDRESS}"
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fi
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