#!/system/bin/sh

# ==============================================
# Configuration parameters - modify as needed
# ==============================================
ETH_IP="192.168.68.91"            # Ethernet IP address
ETH_NETMASK="24"                  # Subnet mask (CIDR format)
ETH_NETWORK="192.168.68.0"        # Network address
ETH_BROADCAST="192.168.68.255"    # Broadcast address
ETH_GATEWAY="192.168.68.1"        # Default gateway
ROUTE_TABLE="20"                  # Routing table number
MAX_INIT_WAIT=150                 # Maximum seconds to wait for ethernet interface
MAX_UP_WAIT=10                    # Maximum seconds to wait for interface to come UP
MAX_ROUTE_WAIT=5                  # Maximum seconds to wait for routing rules

# For debugging only - comment out in production
# set -x

# Record script start time
SCRIPT_START=$(date +%s)

# Cleanup function - handles unexpected interruptions
cleanup() {
  echo "Script interrupted, cleaning up..." >&2
  # Add additional cleanup code here if needed
  exit 1
}
trap cleanup INT TERM

SCRIPT_PATH="$0"
# 确保路径是绝对路径
case "$SCRIPT_PATH" in
  /*) ;;  # 已经是绝对路径
  *) SCRIPT_PATH="$PWD/$SCRIPT_PATH" ;;
esac
SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
echo "Script directory detected as: $SCRIPT_DIR"

# Only configure rp_filter for eth0 interface
echo 0 > /proc/sys/net/ipv4/conf/eth0/rp_filter 2>/dev/null || true

# Wait for eth0 interface to appear
WAITED=0
while [ $WAITED -lt $MAX_INIT_WAIT ]; do
  if [ -d "/sys/class/net/eth0" ]; then
    echo "eth0 found after $WAITED seconds"
    break
  fi
  echo "Wait eth0... ($WAITED/$MAX_INIT_WAIT)"
  sleep 0.1
  WAITED=$((WAITED+1))
done

# Check if eth0 exists
if ! [ -d "/sys/class/net/eth0" ]; then
  echo "Error: eth0 not exists" >&2
  exit 1
fi

# Check physical connection status
if [ -f "/sys/class/net/eth0/carrier" ]; then
  CARRIER=$(cat /sys/class/net/eth0/carrier)
  echo "Physical connection status: $CARRIER (1=connected, 0=disconnected)"
  if [ "$CARRIER" != "1" ]; then
    echo "Warning: Ethernet physical connection may have issues, please check the cable" >&2
  fi
fi

# Clear previous configuration
/system/bin/ip link set eth0 down
/system/bin/ip addr flush dev eth0 
/system/bin/ip route flush dev eth0
/system/bin/ip route flush table $ROUTE_TABLE
/system/bin/ip rule del to $ETH_NETWORK/$ETH_NETMASK 2>/dev/null || true

# Configure physical layer with ethtool (while interface is DOWN)
if [ -x "$SCRIPT_DIR/ethtool" ]; then
  echo "Using ethtool from script directory: $SCRIPT_DIR/ethtool"
  "$SCRIPT_DIR/ethtool" -s eth0 speed 10 duplex full autoneg off
# 其次尝试使用原路径
elif [ -x "/data/data/com.xypower.mpapp/files/ethtool" ]; then
  echo "Configuring eth0 to 10Mbps full duplex..."
  /data/data/com.xypower.mpapp/files/ethtool -s eth0 speed 10 duplex full autoneg off
else
  echo "Warning: ethtool not found, falling back to sysfs configuration" >&2
  # Try sysfs configuration as fallback
  if [ -f "/sys/class/net/eth0/speed" ]; then
    echo "off" > /sys/class/net/eth0/autoneg 2>/dev/null || true
    echo "10" > /sys/class/net/eth0/speed 2>/dev/null || true
    echo "full" > /sys/class/net/eth0/duplex 2>/dev/null || true
  fi
fi

# Configure IP address
/system/bin/ip addr add $ETH_IP/$ETH_NETMASK broadcast $ETH_BROADCAST dev eth0

# Enable interface and wait for UP
/system/bin/ip link set eth0 up

# Use loop to wait for interface UP instead of fixed sleep
WAITED=0
while [ $WAITED -lt $MAX_UP_WAIT ]; do
  IF_STATUS=$(/system/bin/ip link show eth0 | grep -c ",UP")
  if [ "$IF_STATUS" = "1" ]; then
    echo "Interface is UP after $WAITED seconds"
    break
  fi
  echo "Waiting for interface UP... ($WAITED/$MAX_UP_WAIT)"
  sleep 0.5
  WAITED=$((WAITED+1))
done

if [ "$IF_STATUS" != "1" ]; then
  echo "Warning: Interface did not come UP within expected time, attempting to enable again" >&2
  /system/bin/ip link set eth0 up
  sleep 1
fi

# First add to main routing table
/system/bin/ip route add $ETH_NETWORK/$ETH_NETMASK dev eth0 proto static scope link

# Then add to specified routing table
/system/bin/ip route add $ETH_NETWORK/$ETH_NETMASK dev eth0 proto static scope link table $ROUTE_TABLE
ADD_ROUTE_STATUS=$?

if [ $ADD_ROUTE_STATUS -eq 0 ]; then
  echo "Add route successfully"
else
  echo "Failed to add route: $ADD_ROUTE_STATUS" >&2
fi

# Only clear ARP and neighbor cache for eth0
/system/bin/ip neigh flush dev eth0

# Add routing rules - only flush cache once after rule is added
/system/bin/ip rule add from all to $ETH_NETWORK/$ETH_NETMASK lookup $ROUTE_TABLE prio 1000
/system/bin/ip route flush cache dev eth0

# Only enable forwarding for eth0 interface
echo 1 > /proc/sys/net/ipv4/conf/eth0/forwarding 2>/dev/null || true

# Wait for routing rules to take effect - using loop check instead of fixed wait
WAITED=0
while [ $WAITED -lt $MAX_ROUTE_WAIT ]; do
  if /system/bin/ip rule | grep -q "$ETH_NETWORK/$ETH_NETMASK"; then
    echo "Routing rules are now effective after $WAITED seconds"
    break
  fi
  echo "Waiting for routing rules to take effect... ($WAITED/$MAX_ROUTE_WAIT)"
  sleep 0.5
  WAITED=$((WAITED+1))
done

# Display execution time
SCRIPT_END=$(date +%s)
TOTAL_TIME=$((SCRIPT_END - SCRIPT_START))
echo "Total script execution time: $TOTAL_TIME seconds"
exit 0