35 lines
1.3 KiB
Bash
Executable file
35 lines
1.3 KiB
Bash
Executable file
#!/bin/bash
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set -eu
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. /etc/ddns-update/ddns-update.conf
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DDHOST="https://www.ddnss.de/upd.php"
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if ! DNSRESULT="$(host $DDNSNAME)" ; then
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echo "Could not resolve IP address for '$DDNSNAME', no update."
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exit 0
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fi
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DNSIP4="$(echo "$DNSRESULT" | grep -m 1 -oE '[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$' || true )"
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DNSIP6="$(echo "$DNSRESULT" | grep -m 1 -oE '[0-9a-f]{1,4}:.+:[0-9a-f]{1,4}' || true )"
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REALIP4="$(wget -q -O - https://ip4.ddnss.de/meineip.php | \
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grep -m 1 -oE '[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}' || true )"
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REALIP6="$(wget -q -O - https://ip6.ddnss.de/meineip.php | \
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grep -m 1 -oE '[0-9a-f]{1,4}:.+:[0-9a-f]{1,4}' || true )"
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if [ -z "$REALIP4" -a -z "$REALIP6" ] ; then
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echo "Could not detect real IP addresses, exiting."
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exit 0
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fi
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echo "Current DNS: IPv4=$DNSIP4, IPv6=$DNSIP6."
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echo "Detected: IPv4=$REALIP4, IPv6=$REALIP6."
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if [ "$REALIP4" == "$DNSIP4" -a "$REALIP6" == "$DNSIP6" ] ; then
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echo "IP address unchanged, no update."
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else
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echo "IP address changed: $DNSIP4 → ${REALIP4}, $DNSIP6 → ${REALIP6}, updating ddns."
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wget -q -O - $DDHOST'?key='$KEYAUTH'&host='$DDNSNAME'&ip='$REALIP4'&ip6='$REALIP6 \
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| grep -oE "Updated .+ hostname." || echo "Update not confirmed, it might have failed."
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fi
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