mac.py

def recv_pkts(hdr, data):
    packet = EthDecoder().decode(data)
    ip_hdr = packet.child()
    op_code = ip_hdr.get_ar_op()
    src_mac = ip_hdr.as_hrd(ip_hdr.get_ar_sha())
    dest_ip = ip_hdr.as_pro(ip_hdr.get_ar_spa())
    print "ARP Request from Device : " + str(src_mac)

if __name__ == "__main__":
    max_bytes = 1024 # number of bytes to capture per packet
    promiscuous = False # When a data packet is transmitted in non-promiscuous mode, all the LAN devices "listen to" the data to determine if the network address included in the data packet is theirs
    read_timeout = 100 # in milliseconds
    pc = pcapy.open_live("en0", max_bytes, promiscuous, read_timeout)
    packet_limit = 100
    pc.setfilter("arp")

    try:
        pc.loop(packet_limit, recv_pkts) # capture packets
    except KeyboardInterrupt:
        pass