from scapy.all import *
import os

iface = "wlan0"

def h_packet(packet):
    if packet.haslayer(Dot11ProbeReq) or packet.haslayer(Dot11ProbeResp) or packet.haslayer(Dot11AssoReq):
        print "SSID identified " + packet.info

os.system("iwconfig " + iface + "mode monitor")

print "Sniffing traffic on interface " + iface
sniff(iface=iface, prn=h_packet)