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Author: tutoduino

scan_ip_devices.py

@@ -0,0 +1,75 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+import socket
+import ipaddress
+import subprocess
+import threading
+import argparse
+
+# Create a thread class for simultaneous ping of all devices in the network range
+class MyThread(threading.Thread):
+    def __init__(self, host):
+        threading.Thread.__init__(self)
+        self.host = host
+        self.myres = None
+    def run(self):
+        # Call the ping process (count = 2, timeout = 1sec)
+        if subprocess.call(['ping', '-c2', '-W1', str(self.host)], stdout=subprocess.DEVNULL) == 0:
+            try:
+                # Get the hostname of the device that replies to ping
+                hostname = socket.gethostbyaddr(str(self.host))[0]
+            except socket.herror:
+                hostname = '**'
+            self.myres = hostname
+            
+# Thread list is created to store thread results and avoid simultaneous printing
+threads = []
+
+def checkArgs():
+    # Parse the arguments to get the CIDR (CIDR addressing scheme, e.g. 192.168.1.0/24)
+    parser = argparse.ArgumentParser(description='Network scan tool by Herl.')
+    parser.add_argument("--cidr",default="192.168.1.0/24", help="e.g. 192.168.1.0/24")
+    args=parser.parse_args()
+    # check the validity of CIDR
+    cidr = args.cidr.split("/")
+    if len(cidr) != 2:
+        print("Incorrect CIDR")
+        exit()
+    ip_addr = cidr[0].split(".")
+    if len(ip_addr) != 4:
+        print("Incorrect CIDR")
+        exit()
+    if ((not 0 <= int(ip_addr[0]) <= 255) \
+        or (not 0 <= int(ip_addr[1]) <= 255) \
+            or (not 0 <= int(ip_addr[2]) <= 255) \
+                or (not 0 <= int(ip_addr[3]) <= 255)):
+        print("Incorrect CIDR")
+        exit() 
+    if (not 0 <= int(cidr[1]) <= 32):
+        print("Incorrect CIDR")
+        exit()
+        
+    return args.cidr
+               
+if __name__ == '__main__':
+    try:
+        # Check arguments given in parameters
+        cidr = checkArgs()
+        
+        # Get network range as a list
+        my_network = ipaddress.ip_network(cidr)
+        # Loop on all devices of the network range
+        for my_host in my_network.hosts():
+            # Create a thread for pinging the device and add the thread to the end of the thread list
+            threads.append(MyThread(my_host))
+            # Start the previously created thread
+            threads[-1].start()
+        # Wait for all the threads to end and print results    
+        for thread in threads:
+            # Wait the end of the run function
+            thread.join()
+            if thread.myres != None:
+               print("host {} ({}) is up".format(thread.host, thread.myres))
+    except ValueError:
+        print("ValueError exception raised")