In the following example, we see that we have defined a analyze_port() function that has as parameters the host and port to analyze.

You can find the following code in the port_scan_scapy.py file:

from scapy.all import sr1, IP, TCP

OPEN_PORTS = []

def analyze_port(host, port):
 """
 Function that determines the status of a port: Open / closed
 :param host: target
 :param port: port to test
 :type port: int
 """
 
 print "[ii] Scanning port %s" % port
 res = sr1(IP(dst=host)/TCP(dport=port), verbose=False, timeout=0.2)
 if res is not None and TCP in res:
     if res[TCP].flags == 18:
         OPEN_PORTS.append(port)
         print "Port %s open" % port

def main():
 for x in xrange(0, 80):
     analyze_port("domain", x)
 print "[*] Open ports:"
 for x in OPEN_PORTS:
     print " - %s/TCP" % x