everything split out ut not tested

pialert/arpscan.py

@@ -0,0 +1,55 @@
+import re
+import subprocess
+
+from logger import mylog
+
+
+#-------------------------------------------------------------------------------
+def execute_arpscan (userSubnets):
+
+    # output of possible multiple interfaces
+    arpscan_output = ""
+
+    # scan each interface
+    for interface in userSubnets :            
+        arpscan_output += execute_arpscan_on_interface (interface)    
+    
+    # Search IP + MAC + Vendor as regular expresion
+    re_ip = r'(?P<ip>((2[0-5]|1[0-9]|[0-9])?[0-9]\.){3}((2[0-5]|1[0-9]|[0-9])?[0-9]))'
+    re_mac = r'(?P<mac>([0-9a-fA-F]{2}[:-]){5}([0-9a-fA-F]{2}))'
+    re_hw = r'(?P<hw>.*)'
+    re_pattern = re.compile (re_ip + '\s+' + re_mac + '\s' + re_hw)
+
+    # Create Userdict of devices
+    devices_list = [device.groupdict()
+        for device in re.finditer (re_pattern, arpscan_output)]
+    
+    # Delete duplicate MAC
+    unique_mac = [] 
+    unique_devices = [] 
+
+    for device in devices_list :
+        if device['mac'] not in unique_mac: 
+            unique_mac.append(device['mac'])
+            unique_devices.append(device)    
+
+    # return list
+    return unique_devices
+
+#-------------------------------------------------------------------------------
+def execute_arpscan_on_interface (interface):    
+    # Prepare command arguments
+    subnets = interface.strip().split()
+    # Retry is 6 to avoid false offline devices
+    arpscan_args = ['sudo', 'arp-scan', '--ignoredups', '--retry=6'] + subnets
+
+    # Execute command
+    try:
+        # try runnning a subprocess
+        result = subprocess.check_output (arpscan_args, universal_newlines=True)
+    except subprocess.CalledProcessError as e:
+        # An error occured, handle it
+        mylog('none', [e.output])
+        result = ""
+
+    return result