openwrt-packages/admin/syslog-ng/files/scl/network_localhost/detect.sh

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#!/bin/sh
if [ "$(sysctl net.ipv6.conf.lo.disable_ipv6 | cut -d' ' -f 3)" = "0" ]; then
echo 'network(ip("::1") port(514) transport(udp) ip-protocol(6) )'
else
echo 'network(ip("127.0.0.1") port(514) transport(udp) ip-protocol(4) )'
fi