#!/bin/sh
# net_collect.sh - collect NIC and driver diagnostics in busybox/initramfs

OUT="${1:-/tmp/netdiag-$(date +%Y%m%d-%H%M%S).log}"

echo "==== NET DIAGNOSTIC DUMP $(date) ====" > "$OUT"

echo >> "$OUT"
echo "== uname -a ==" >> "$OUT"
uname -a >> "$OUT" 2>&1

echo >> "$OUT"
echo "== /proc/cmdline ==" >> "$OUT"
cat /proc/cmdline >> "$OUT" 2>&1

echo >> "$OUT"
echo "== Loaded modules ==" >> "$OUT"
# busybox lsmod is fine
lsmod >> "$OUT" 2>&1

echo >> "$OUT"
echo "== PCI info for Intel NICs (if any) ==" >> "$OUT"
if [ -d /sys/bus/pci/devices ]; then
  for p in /sys/bus/pci/devices/*; do
    [ -e "$p/vendor" ] || continue
    vend=$(cat "$p/vendor" 2>/dev/null)
    dev=$(cat "$p/device" 2>/dev/null)
    # 0x8086 is Intel
    if [ "$vend" = "0x8086" ]; then
      echo "--- $p ---" >> "$OUT"
      echo "vendor=$vend device=$dev" >> "$OUT"
      [ -e "$p/class" ] && echo "class=$(cat "$p/class")" >> "$OUT"
      [ -e "$p/subsystem_vendor" ] && echo "subsystem_vendor=$(cat "$p/subsystem_vendor")" >> "$OUT"
      [ -e "$p/subsystem_device" ] && echo "subsystem_device=$(cat "$p/subsystem_device")" >> "$OUT"
    fi
  done
fi

echo >> "$OUT"
echo "== Network interfaces ==" >> "$OUT"
for n in /sys/class/net/*; do
  IF=$(basename "$n")
  echo "--- $IF ---" >> "$OUT"
  if [ -e "$n/device/driver" ]; then
    drv=$(readlink -f "$n/device/driver" 2>/dev/null | sed 's#.*/##')
    echo "driver=$drv" >> "$OUT"
  else
    echo "driver=(none)" >> "$OUT"
  fi

  echo "ip link show $IF:" >> "$OUT"
  ip link show "$IF" >> "$OUT" 2>&1

  echo "ethtool $IF:" >> "$OUT"
  ethtool "$IF" >> "$OUT" 2>&1

  echo "ethtool -k $IF:" >> "$OUT"
  ethtool -k "$IF" >> "$OUT" 2>&1

  echo "ethtool -g $IF:" >> "$OUT"
  ethtool -g "$IF" >> "$OUT" 2>&1

  echo "ethtool -S $IF:" >> "$OUT"
  ethtool -S "$IF" >> "$OUT" 2>&1
done

echo >> "$OUT"
echo "== e1000e module parameters (if present) ==" >> "$OUT"
if [ -d /sys/module/e1000e ]; then
  for p in /sys/module/e1000e/parameters/*; do
    name=$(basename "$p")
    val=$(cat "$p" 2>/dev/null)
    echo "$name=$val" >> "$OUT"
  done
else
  echo "e1000e module not loaded" >> "$OUT"
fi

echo >> "$OUT"
echo "== dmesg (last 200 lines) ==" >> "$OUT"
dmesg | tail -n 200 >> "$OUT" 2>&1

echo >> "$OUT"
echo "==== END ====" >> "$OUT"

echo "Written diagnostics to: $OUT"