synprobe

synprobe.py

#!/usr/bin/python2
# SYN probes a port on an IP, tells if open/closed
from scapy.all import *
import sys

def synprobe(targetIP, targetPort):
    """ Send a SYN packet, recieve reply, tell if open/closed """
    probe = sr1(IP(dst=targetIP)/TCP(dport= int(targetPort), flags = "S"), verbose = False, timeout = 2)
    if probe[TCP].flags == 18:
        print "%s:%s open" %(targetIP, targetPort)
    else:
        print "%s:%s closed" %(targetIP, targetPort)

def main(args):
    if len(sys.argv) != 3:
        sys.exit("usage: %s <targetip> <targetport>" %(sys.argv[0]))
    synprobe(sys.argv[1], sys.argv[2])

if __name__ == "__main__":
    main(sys.argv)