Mastering Python for Networking and Security

Port-scanning with scapy

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, TCPOPEN_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" % portdef main(): for x in xrange(0, 80):     analyze_port("domain", x) print "[*] Open ports:" for x in OPEN_PORTS: ...