86 lines
1.8 KiB
Bash
Executable File
86 lines
1.8 KiB
Bash
Executable File
#!/bin/sh
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hostname=$1
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device=$2
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file4="$HOME/.dynv6.addr4"
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file6="$HOME/.dynv6.addr6"
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[ -e $file4 ] && old4=`cat $file4`
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[ -e $file6 ] && old6=`cat $file6`
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# ensure we have required information
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if [ -z "$hostname" -o -z "$token" ]; then
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echo "Usage: token=<your-authentication-token> [netmask=64] $0 your-name.dynv6.net [device]"
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exit 1
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fi
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# [device] would be something like "eth0" or "wlan0"
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if [ -n "$device" ]; then
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device="dev $device"
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fi
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# what command should we use to call the API
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if [ -e /usr/bin/curl ]; then
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bin="curl -fsS"
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elif [ -e /usr/bin/wget ]; then
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bin="wget -O-"
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else
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echo "neither curl nor wget found"
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exit 1
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fi
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# what command should we use to determine IPv4
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if [ -e /usr/bin/dig ]; then
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lookup4="dig -4 +short A myip.opendns.com @resolver1.opendns.com"
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else
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lookup4="$bin https://ipinfo.io/ip"
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fi
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# lookup IPv4
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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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# calculate IPv6
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address6=$(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 "$address6" ]; then
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echo "no IPv6 address found"
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exit 1
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fi
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if [ -z "$netmask" ]; then
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netmask="128"
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fi
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ipv6="$address6/$netmask"
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# update IPv4, if changed
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if [ "$old4" = "$ipv4" ]; then
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echo "IPv4 address unchanged"
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else
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echo -n "Updating IPv4: "
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$bin "https://ipv4.dynv6.com/api/update?hostname=$hostname&ipv4=$ipv4&token=$token"
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echo ""
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# save current 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" = "$ipv6" ]; then
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echo "IPv6 address unchanged"
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else
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# send addresses to dynv6
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echo -n "Updating IPv6: "
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$bin "https://ipv6.dynv6.com/api/update?hostname=$hostname&ipv6=$ipv6&token=$token"
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echo ""
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# save current address
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echo $ipv6 > $file6
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fi
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