#!/usr/bin/env bash
set -euo pipefail

if [ "${XRAY_IPV6_ENABLED:-0}" = "1" ]; then
    echo "IPv6 enabled by XRAY_IPV6_ENABLED=1." >&2
    exit 0
fi

for path in \
    /proc/sys/net/ipv6/conf/all/disable_ipv6 \
    /proc/sys/net/ipv6/conf/default/disable_ipv6 \
    /proc/sys/net/ipv6/conf/lo/disable_ipv6; do
    if [ -w "${path}" ]; then
        printf '1' >"${path}" || true
    fi
done

echo "IPv6 disabled by default. Set XRAY_IPV6_ENABLED=1 to keep it enabled." >&2