pingnet: Add a script to identify available addresses on a network

pingnet.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+import ipaddr
+import os
+import socket
+import subprocess
+import sys
+
+def main():
+    for arg in sys.argv[1:]:
+        try:
+            net = ipaddr.IPv4Network(arg)
+        except ipaddr.AddressValueError:
+            sys.stderr.write('Invalid network address: {}\n'.format(arg))
+        else:
+            for ip in net.iterhosts():
+                p = subprocess.Popen(['ping', '-c1', '-W1', str(ip)],
+                                     stdout=open(os.devnull, 'w'),
+                                     stderr=open(os.devnull, 'w'),
+                                     stdin=open(os.devnull))
+                try:
+                    p.wait()
+                except KeyboardInterrupt:
+                    print()
+                    raise SystemExit
+                try:
+                    hostname = '{} ({})'.format(
+                        ip,
+                        socket.gethostbyaddr(str(ip))[0],
+                    )
+                except socket.herror:
+                    hostname = ip
+                state = 'in use' if p.returncode == 0 else 'not responding'
+                print('{} is {}'.format(hostname, state))
+
+
+if __name__ == '__main__':
+    main()