#!/bin/sh

# Configure a network interface using settings from /etc/network.conf

# Copyright (C)2013-2024, Philip Munts dba Munts Technologies.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

INTERFACE=$1

if [ -z "${INTERFACE}" ]; then
  echo ""
  echo "Usage: netstart.script <interface>"
  echo ""
  exit 1
fi

# Source some configuration variables

. /etc/platform
. /etc/network.conf

# Extract settings for this interface

eval MACADDR="\$${INTERFACE}_macaddr"
eval ADDRESS="\$${INTERFACE}_address"
eval NETMASK="\$${INTERFACE}_netmask"
eval PEERADDR="\$${INTERFACE}_peer"

# Change the MAC address for this interface

if [ -n "${MACADDR}" ]; then
  ifconfig ${INTERFACE} 0.0.0.0 down hw ether ${MACADDR}
fi

# Start USB Network Gadget DHCP server on this interface, if requested

if [ "`ethtool -i ${INTERFACE} 2>&1 | awk '/driver:/ { print $2 }'`" = "g_ether" -a $((OPTIONS & 0x02)) -ne 0 ]; then
  ifconfig ${INTERFACE} ${ADDRESS:-10.254.254.252} netmask ${NETMASK:-255.255.255.248}
  iptables -w -I INPUT -i ${INTERFACE} -j ACCEPT
  echo "# USB Ethernet Gadget DHCP server configuration"		>/var/run/udhcpd.${INTERFACE}.conf
  echo ""								>>/var/run/udhcpd.${INTERFACE}.conf
  echo "interface		${INTERFACE}"				>>/var/run/udhcpd.${INTERFACE}.conf
  echo ""								>>/var/run/udhcpd.${INTERFACE}.conf
  echo "lease_file		/var/run/udhcpd.${INTERFACE}.leases"	>>/var/run/udhcpd.${INTERFACE}.conf
  echo "pidfile			/var/run/udhcpd.${INTERFACE}.pid"	>>/var/run/udhcpd.${INTERFACE}.conf
  echo ""								>>/var/run/udhcpd.${INTERFACE}.conf
  echo "max_leases		1"					>>/var/run/udhcpd.${INTERFACE}.conf
  echo "start			${PEERADDR:-10.254.254.253}"		>>/var/run/udhcpd.${INTERFACE}.conf
  echo "end			${PEERADDR:-10.254.254.253}"		>>/var/run/udhcpd.${INTERFACE}.conf
  echo ""								>>/var/run/udhcpd.${INTERFACE}.conf
  echo "option subnet		${NETMASK:-255.255.255.248}"		>>/var/run/udhcpd.${INTERFACE}.conf
  chmod 444 /var/run/udhcpd.${INTERFACE}.conf
  touch /var/run/udhcpd.${INTERFACE}.leases
  udhcpd /var/run/udhcpd.${INTERFACE}.conf

  if [ $((OPTIONS & 0x200)) -ne 0 ]; then
    mdnsd ${INTERFACE} `hostname -s` ${ADDRESS:-10.254.254.252}
  fi

  if [ $((OPTIONS & 0x08)) -ne 0 ]; then
    killall -q ntpd
    ntpd
  fi

  exit 0
fi

# Delegate network configuration to udhcpc, if applicable

if [ -z "${ADDRESS}" -o "${ADDRESS}" = "dhcp" ]; then
  udhcpc -i ${INTERFACE} -p /var/run/udhcpc.${INTERFACE}.pid -b
  exit $?
fi

# Configure the network interface

if [ -n "${NETMASK}" ]; then
  ifconfig ${INTERFACE} ${ADDRESS} netmask ${NETMASK}
else
  ifconfig ${INTERFACE} ${ADDRESS}
fi

# Configure default gateway

if [ -n "${gateway}" ]; then
  route add default gw ${gateway}
fi

if [ -n "${domain}" -o -n "${nameservers}" ]; then
  echo "# Created by netstart.script" >/etc/resolv.conf

# Configure domain

  if [ -n "${domain}" ]; then
    echo "domain ${domain}" >>/etc/resolv.conf
  fi

# Configure name servers

  if [ -n "${nameservers}" ]; then
    for N in ${nameservers} ; do
      echo "nameserver $N" >>/etc/resolv.conf
    done
  fi
fi

# Start mdnsd

if [ $((OPTIONS & 0x200)) -ne 0 ]; then
  mdnsd ${INTERFACE} `hostname -s` ${ADDRESS}
fi

# Restart ntpd

if [ $((OPTIONS & 0x08)) -ne 0 ]; then
  killall -q ntpd
  ntpd
fi

exit 0