committing random WM stuff

scan_hosts.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# Check if the subnet argument is provided
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <subnet/CIDR>"
+    exit 1
+fi
+
+# Extract the base IP and CIDR from the argument
+subnet="$1"
+IFS='.' read -r -a octets <<< "$(echo "$subnet" | cut -d'/' -f1)"
+cidr=$(echo "$subnet" | cut -d'/' -f2)
+
+# Function to ping a single IP
+ping_host() {
+    ip="$1"
+    if ping -c 1 -W 1 "$ip" &> /dev/null; then
+        echo "$ip is up"
+    fi
+}
+
+# Export the function so it can be used by GNU Parallel
+export -f ping_host
+
+# Generate IPs based on CIDR
+if [ "$cidr" -eq 24 ]; then
+    # For /24, only the last octet changes
+    for i in {1..254}; do
+        ip="${octets[0]}.${octets[1]}.${octets[2]}.$i"
+        echo "$ip"
+    done
+elif [ "$cidr" -eq 16 ]; then
+    # For /16, the last two octets change
+    for i in {0..255}; do
+        for j in {0..255}; do
+            if [ "$i" -eq 0 ] && [ "$j" -eq 0 ]; then
+                continue  # Skip network address
+            fi
+            if [ "$i" -eq 255 ] && [ "$j" -eq 255 ]; then
+                continue  # Skip broadcast address
+            fi
+            ip="${octets[0]}.${octets[1]}.$i.$j"
+            echo "$ip"
+        done
+    done
+else
+    echo "Unsupported CIDR notation. Only /24 and /16 are supported in this script."
+    exit 1
+fi | parallel -j 512 --progress ping_host
+
+echo "Scan completed."
+