(Sep-12-2018, 08:11 AM)buran Wrote: it's because your file name is scapy.py. You import your own file, not scapy package. Rename your file.

#! /usr/bin/python
import urllib2
import json
import codecs

def arp_scan():

        from scapy.all import srp,Ether,ARP,conf
        conf.verb=0
        ans, unans = srp(Ether(dst="ff:ff:ff:ff:ff:ff")/ARP(pdst="192.168.20.0/24"),timeout=2)
        for snd,rcv in ans:
                d = rcv.sprintf("%Ether.src%")
                print(d)
                
                
arp_scan()



#API base url,you can also use https if you need
url = "http://macvendors.co/api/"
#Mac address to lookup vendor from
mac_address =  arp_scan()

request = urllib2.Request(url+mac_address, headers={'User-Agent' : "API Browser"}) 
response = urllib2.urlopen( request )
#Fix: json object must be str, not 'bytes'
reader = codecs.getreader("utf-8")
obj = json.load(reader(response))

#Print company name
print (obj['result']['company']);

Error:
Traceback (most recent call last):
  File "/tmp/ArpScanner/arp.py", line 26, in <module>
    request = urllib2.Request(url+mac_address, headers={'User-Agent' : "API Browser"})
TypeError: cannot concatenate 'str' and 'NoneType' objects

(Sep-12-2018, 04:54 PM)ichabod801 Wrote: Your arp_scan function does not have a return statement, so it returns None by default. So that's what mac_address gets set to, and that causes the error. You need to return the string version of whatever MAC address you're looking for from the arp_scan function.

def add_two(x):
    return x + 2

Output:
>>> y = add_two(3)
>>> y
5