115 lines
2.7 KiB
Bash
Executable File
115 lines
2.7 KiB
Bash
Executable File
#!/bin/sh
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quiet=false
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while getopts 'q' flag; do
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case "$flag" in
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q)
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quiet=true
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;;
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esac
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done
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shift "$((OPTIND-1))"
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# we need zone and token, we also accept, netmask, and overrides
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zone=$1
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device=$2
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scope=$3
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# stop if we do not have the required information
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if [ -z "$zone" -o -z "$token" ]; then
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echo '"-q": quiet flag, to suppress "address unchanged" messages'
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echo "Usage: token=<your-authentication-token> [netmask=64] [ipv4=<override>] [ipv6=<override>] $0 your-name.dynv6.net [-q] [device] [scope]"
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exit 1
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fi
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# we store ip addresses in files, so we only update when there is a change
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file4="$HOME/.dynv6.addr4.$zone"
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file6="$HOME/.dynv6.addr6.$zone"
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# load existing ip addresses, when available
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[ -e $file4 ] && old4=`cat $file4`
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[ -e $file6 ] && old6=`cat $file6`
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# [device] would be something like "eth0" or "wlan0"
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if [ -n "$device" ]; then
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device="dev $device"
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fi
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# [scope] normally "global", but "link" can be useful in select proxy cases (such as wsl)
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if [ -n "$scope" ]; then
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scope="scope $scope"
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else
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scope="scope global"
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fi
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# what command should we use to call the API
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if [ -e /usr/bin/curl ]; then
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bin="curl -fsS"
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elif [ -e /usr/bin/wget ]; then
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bin="wget -O-"
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else
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echo "neither curl nor wget found"
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exit 1
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fi
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# what command should we use to determine IPv4
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if [ -e /usr/bin/dig ]; then
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lookup4="dig -4 +short A myip.opendns.com @resolver1.opendns.com"
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else
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lookup4="$bin https://ipinfo.io/ip"
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fi
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# lookup IPv4, will be skipped if variable already set
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if [ -z "$ipv4" ]; then
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ipv4=`$lookup4`
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if [ -z "$ipv4" ]; then
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echo "failed to lookup IPv4 address, continuing with 'auto'"
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ipv4="auto"
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fi
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fi
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if [ -z "$netmask" ]; then
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netmask="128"
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fi
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# lookup IPv6, will be skipped if variable already set
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if [ -z "$ipv6" ]; then
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ipv6=$(ip -6 addr list $scope $device | grep -v " fd" | sed -n 's/.*inet6 \([0-9a-f:]\+\).*/\1/p' | head -n 1)
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if [ -z "$ipv6" ]; then
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echo "no IPv6 address found"
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exit 1
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fi
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fi
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ipv6="$ipv6/$netmask"
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# update IPv4, if changed
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if [ "$old4" = "$ipv4" ]; then
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if [ "$quiet" = false ]; then
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echo "IPv4 address unchanged"
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fi
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else
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# send IPv4 address to dynv6
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echo -n "Updating IPv4: "
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$bin "https://dynv6.com/api/update?zone=$zone&ipv4=$ipv4&token=$token"
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echo ""
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# save current IPv4 address
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echo $ipv4 > $file4
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fi
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# update IPv6, if changed
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if [ "$old6" = "$ipv6" ]; then
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if [ "$quiet" = false ]; then
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echo "IPv6 address unchanged"
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fi
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else
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# send IPv6 address to dynv6
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echo -n "Updating IPv6: "
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$bin "https://dynv6.com/api/update?zone=$zone&ipv6=$ipv6&token=$token"
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echo ""
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# save current IPv6 address
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echo $ipv6 > $file6
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fi
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