WLAN SSID Sniffer in Python using Raw Sockets

wlan-ssid-sniffer-python-raw-sockets.py

#!/usr/bin/env python
import socket 
rawSocket = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003))
rawSocket.bind(("mon0", 0x0003))
ap_list = set()
while True :
  pkt = rawSocket.recvfrom(2048)[0] 
	if pkt[26] == "\x80" :
		if pkt[36:42] not in ap_list  and ord(pkt[63]) > 0:
			ap_list.add(pkt[36:42])
			print "SSID: %s  AP MAC: %s" % (pkt[64:64 +ord(pkt[63])], pkt[36:42].encode('hex'))

Blog post with full details: http://hackoftheday.securitytube.net/2013/04/wi-fi-ssid-sniffer-in-12-lines-of.html