│ File: netcheck.sh
───────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ #!/bin/bash
   2   │ # by AustinMStaton I got bored in  this is a fast way to see whats all on my homelab
   3   │ # a Short way is to just run nmap -v -sn 192.168.0.1/24 | grep "Host is up" -B1 but is not the point lol
   4   │
   5   │ # A more powerful network scanner using fping for discovery and nmap for details.
   6   │
   7   │ # ====== 1. Initialization ======
   8   │ # An array to store the IPs of all hosts that are found.
   9   │ found_hosts=()
  10   │
  11   │ # ====== 2. Check for Required Tools ======
  12   │ # Ensure fping and nmap are installed before running.
  13   │ for tool in fping nmap; do
  14   │     if ! command -v "$tool" &> /dev/null; then
  15   │         echo -e "\033[31mError: '$tool' is not installed.\033[0m"
  16   │         echo "Please install it to continue. (e.g., 'sudo apt install $tool')"
  17   │         exit 1
  18   │     fi
  19   │ done
  20   │
  21   │ # ====== 3. Auto-Detect Network Range ======
  22   │ # Automatically find the primary network address (e.g., 192.168.1.0/24).
  23   │ NETWORK_RANGE=$(ip -o -4 addr show | awk '!/127.0.0.1/ {print $4}' | head -n 1)
  24   │
  25   │ if [ -z "$NETWORK_RANGE" ]; then
  26   │     echo -e "\033[31mCould not auto-detect network range.\033[0m"
  27   │     read -p "Please enter your network range (e.g., 192.168.1.0/24): " NETWORK_RANGE
  28   │ fi
  29   │
  30   │ echo -e "\n\033[1;33mScanning network: $NETWORK_RANGE\033[0m"
  31   │ echo "This may take a few moments..."
  32   │
  33   │ # ====== 4. Discover Live Hosts and Scan Them ======
  34   │ # We use process substitution <(...) to feed the loop without creating a subshell.
  35   │ # This ensures the found_hosts array is not lost after the loop.
  36   │ while read -r ip; do
  37   │     # For each live IP found, add it to our array
  38   │     found_hosts+=("$ip")
  39   │
  40   │     # Print a clear header for the detailed scan
  41   │     echo -e "\n\033[1;34m===========================================\033[0m"
  42   │     echo -e "\033[1;32m[+] Host Found: $ip\033[0m"
  43   │     echo -e "\033[1;34m===========================================\033[0m"
  44   │
  45   │     # Run nmap on the IP. If the script has root privileges, enable OS detection.
  46   │     if [[ $EUID -eq 0 ]]; then
  47   │         nmap -T4 -F -O --osscan-limit "$ip"
  48   │     else
  49   │         nmap -T4 -F "$ip"
  50   │     fi
  51   │ done < <(fping -a -g "$NETWORK_RANGE" 2>/dev/null)
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