#
# Setup Networking
#

# Load utility functions
. ./functions.sh

# Install and setup hostname
install_readonly files/network/hostname "${ETCDIR}/hostname"
sed -i "s/^rpi2-jessie/${HOSTNAME}/" "${ETCDIR}/hostname"

# Install and setup hosts
install_readonly files/network/hosts "${ETCDIR}/hosts"
sed -i "s/rpi2-jessie/${HOSTNAME}/" "${ETCDIR}/hosts"

# Setup hostname entry with static IP
if [ "$NET_ADDRESS" != "" ] ; then
  NET_IP=$(echo "${NET_ADDRESS}" | cut -f 1 -d'/')
  sed -i "s/^127.0.1.1/${NET_IP}/" "${ETCDIR}/hosts"
fi

# Remove IPv6 hosts
if [ "$ENABLE_IPV6" = false ] ; then
  sed -i -e "/::[1-9]/d" -e "/^$/d" "${ETCDIR}/hosts"
fi

# Install hint about network configuration
install_readonly files/network/interfaces "${ETCDIR}/network/interfaces"

# Install configuration for interface eth0
install_readonly files/network/eth.network "${ETCDIR}/systemd/network/eth.network"

if [ "$ENABLE_DHCP" = true ] ; then
  # Enable DHCP configuration for interface eth0
  sed -i -e "s/DHCP=.*/DHCP=yes/" -e "/DHCP/q" "${ETCDIR}/systemd/network/eth.network"

  # Set DHCP configuration to IPv4 only
  if [ "$ENABLE_IPV6" = false ] ; then
    sed -i "s/DHCP=.*/DHCP=v4/" "${ETCDIR}/systemd/network/eth.network"
  fi

else # ENABLE_DHCP=false
  # Set static network configuration for interface eth0
  sed -i\
  -e "s|DHCP=.*|DHCP=no|"\
  -e "s|Address=\$|Address=${NET_ADDRESS}|"\
  -e "s|Gateway=\$|Gateway=${NET_GATEWAY}|"\
  -e "0,/DNS=\$/ s|DNS=\$|DNS=${NET_DNS_1}|"\
  -e "0,/DNS=\$/ s|DNS=\$|DNS=${NET_DNS_2}|"\
  -e "s|Domains=\$|Domains=${NET_DNS_DOMAINS}|"\
  -e "0,/NTP=\$/ s|NTP=\$|NTP=${NET_NTP_1}|"\
  -e "0,/NTP=\$/ s|NTP=\$|NTP=${NET_NTP_2}|"\
  "${ETCDIR}/systemd/network/eth.network"
fi

# Remove empty settings from network configuration
sed -i "/.*=\$/d" "${ETCDIR}/systemd/network/eth.network"

# Enable systemd-networkd service
chroot_exec systemctl enable systemd-networkd

# Install host.conf resolver configuration
install_readonly files/network/host.conf "${ETCDIR}/host.conf"

# Enable network stack hardening
if [ "$ENABLE_HARDNET" = true ] ; then
  # Install sysctl.d configuration files
  install_readonly files/sysctl.d/82-rpi-net-hardening.conf "${ETCDIR}/sysctl.d/82-rpi-net-hardening.conf"

  # Setup resolver warnings about spoofed addresses
  sed -i "s/^# spoof warn/spoof warn/" "${ETCDIR}/host.conf"
fi