SRI TP scapy TCP connect dumb scanner

scan.py

from scapy.all import *

ip_dst = "104.16.34.249"

for i in range(1, 65536):
    ans,uns = sr(IP(dst=ip_dst) / TCP(dport=i, flags="S"), timeout=1, retry=-2, verbose=False)

    try:
        if ans[0][1].getlayer(TCP).flags & 0x12 == 0x12:
                print str(i) + " is open"
                ans.summary()
                # On ferme la communication
                sr(IP(dst=ip_dst) / TCP(dport=i, flags="AR"), timeout=10, verbose=False)

    except AttributeError:
        print str(i) + " is closed"