scapy_tcp_scan.py

#!/opt/local/bin/python


import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy import *

dst_ip = "5.0.173.19"
src_port = RandShort()
dst_port = 80

tcp_connect_scan_resp = sr1(IP(dst=dst_ip)/TCP \
    (sport=src_port,dport=dst_port,flags="S"),timeout=10)

if(str(type(tcp_connect_scan_resp)) == "<type 'NoneType'>"):
    print "closed"

elif(tcp_connect_scan_resp.haslayer(TCP)):
    if(tcp_connect_scan_resp.getlayer(TCP).flags == 0x12):
        send_rst = sr(IP(dst=dst_ip)/TCP \
            (sport=src_port,dport=dst_port,flags="AR"),timeout=10)
        print "open"
    elif(tcp_connect_scan_resp.getlayer(TCP).flags == 0x14):
        print "closed"