#!/bin/sh
# FIPS first-boot setup — runs once after package installation.
# Configures the firewall and kernel modules for FIPS operation.
# This script is executed by /etc/rc.d/S19sysctl on first boot and
# then deleted by the UCI defaults mechanism.

# ---------------------------------------------------------------------------
# 1. Kernel modules
# ---------------------------------------------------------------------------

# kmod-tun is listed as a package dependency, but ensure the module is loaded.
modprobe tun 2>/dev/null || true
echo "tun" > /etc/modules.d/tun

# kmod-br-netfilter makes AF_PACKET visible on bridge member ports.
modprobe br_netfilter 2>/dev/null || true
echo "br_netfilter" > /etc/modules.d/br-netfilter

# Apply the sysctl settings shipped in /etc/sysctl.d/fips-bridge.conf now
# (the file will be applied automatically on subsequent boots).
sysctl -p /etc/sysctl.d/fips-bridge.conf 2>/dev/null || true

# ---------------------------------------------------------------------------
# 2. Firewall — add fips0 to the lan zone (fw4 / UCI)
# ---------------------------------------------------------------------------
# fw4 (nftables) matches zones by device name, so adding fips0 as a 'device'
# to the lan zone makes all traffic on the TUN interface accepted without
# needing raw nft rules in the base chains.

z=0
while uci -q get "firewall.@zone[$z]" >/dev/null 2>&1; do
	if [ "$(uci -q get "firewall.@zone[$z].name" 2>/dev/null)" = "lan" ]; then
		uci -q del_list "firewall.@zone[$z].device=fips0" 2>/dev/null || true
		uci add_list "firewall.@zone[$z].device=fips0"
		break
	fi
	z=$((z + 1))
done

# Install a firewall include so /etc/fips/firewall.sh is re-applied on every
# firewall reload (belt-and-suspenders for iptables-based OpenWrt builds).
FOUND=0
j=0
while uci -q get "firewall.@include[$j]" >/dev/null 2>&1; do
	if [ "$(uci -q get "firewall.@include[$j].path" 2>/dev/null)" = "/etc/fips/firewall.sh" ]; then
		FOUND=1
		break
	fi
	j=$((j + 1))
done
if [ "$FOUND" = "0" ]; then
	uci add firewall include
	uci set "firewall.@include[-1].path=/etc/fips/firewall.sh"
	uci set "firewall.@include[-1].reload=1"
fi

uci commit firewall

# ---------------------------------------------------------------------------
# 3. dnsmasq UCI registration
# ---------------------------------------------------------------------------
# /etc/dnsmasq.d/fips.conf already handles runtime forwarding.
# Register via UCI as well so the settings survive a full dnsmasq config
# regeneration (e.g. after a firmware upgrade that rebuilds dnsmasq.conf).

uci -q del_list dhcp.@dnsmasq[0].server="/fips/127.0.0.1#5354" 2>/dev/null || true
uci add_list dhcp.@dnsmasq[0].server="/fips/127.0.0.1#5354"
uci -q del_list dhcp.@dnsmasq[0].rebind_domain="fips" 2>/dev/null || true
uci add_list dhcp.@dnsmasq[0].rebind_domain="fips"
uci commit dhcp

exit 0
