Making a Fast Port Scanner

Question

So I'm making a port scanner in python...

import socket
ip = "External IP"
s = socket.socket(2, 1) #socket.AF_INET, socket.SOCK_STREAM

def porttry(ip, port):
    try:
        s.connect((ip, port))
        return True
    except:
        return None

for port in range(0, 10000):
    value = porttry(ip, port)
    if value == None:
        print("Port not opened on %d" % port)
    else:
        print("Port opened on %d" % port)
        break
raw_input()

But this is too slow, I want to somehow be able to some how close or break code after a period of time of not returning anything.

Solution 1

In addition to setting socket timeout, you can also apply multi-threading technique to turbo boost the process. It will be, at best, N times faster when you have N ports to scan.

# This script runs on Python 3
import socket, threading


def TCP_connect(ip, port_number, delay, output):
    TCPsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    TCPsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    TCPsock.settimeout(delay)
    try:
        TCPsock.connect((ip, port_number))
        output[port_number] = 'Listening'
    except:
        output[port_number] = ''



def scan_ports(host_ip, delay):

    threads = []        # To run TCP_connect concurrently
    output = {}         # For printing purposes

    # Spawning threads to scan ports
    for i in range(10000):
        t = threading.Thread(target=TCP_connect, args=(host_ip, i, delay, output))
        threads.append(t)

    # Starting threads
    for i in range(10000):
        threads[i].start()

    # Locking the main thread until all threads complete
    for i in range(10000):
        threads[i].join()

    # Printing listening ports from small to large
    for i in range(10000):
        if output[i] == 'Listening':
            print(str(i) + ': ' + output[i])



def main():
    host_ip = input("Enter host IP: ")
    delay = int(input("How many seconds the socket is going to wait until timeout: "))   
    scan_ports(host_ip, delay)

if __name__ == "__main__":
    main()

Solution 2

here is a quick and simple port scanner, it scans 100000 ports in 180 sec:

import threading
import socket

target = 'pythonprogramming.net'
#ip = socket.gethostbyname(target)

def portscan(port):

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.settimeout(0.5)# 

    try:
        con = s.connect((target,port))

        print('Port :',port,"is open.")

        con.close()
    except: 
        pass
r = 1 
for x in range(1,100): 

    t = threading.Thread(target=portscan,kwargs={'port':r}) 

    r += 1     
    t.start() 

Solution 3

Consider setting a timeout instead of a for loop by using socket.setdefaulttimeout(timeout).

Solution 4

This should be a bit faster.

#-*-coding:utf8;-*-
#qpy:3
#qpy:console

import socket
import os

# This is used to set a default timeout on socket
# objects.
DEFAULT_TIMEOUT = 0.5

# This is used for checking if a call to socket.connect_ex
# was successful.
SUCCESS = 0

def check_port(*host_port, timeout=DEFAULT_TIMEOUT):
    ''' Try to connect to a specified host on a specified port.
    If the connection takes longer then the TIMEOUT we set we assume
    the host is down. If the connection is a success we can safely assume
    the host is up and listing on port x. If the connection fails for any
    other reason we assume the host is down and the port is closed.'''

    # Create and configure the socket.
    sock = socket.socket()
    sock.settimeout(timeout)

    # the SO_REUSEADDR flag tells the kernel to reuse a local 
    # socket in TIME_WAIT state, without waiting for its natural
    # timeout to expire.
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    # Like connect(address), but return an error indicator instead
    # of raising an exception for errors returned by the C-level connect() 
    # call (other problems, such as “host not found,” can still raise exceptions). 
    # The error indicator is 0 if the operation succeeded, otherwise the value of 
    # the errnovariable. This is useful to support, for example, asynchronous connects.
    connected = sock.connect_ex(host_port) is SUCCESS

    # Mark the socket closed. 
    # The underlying system resource (e.g. a file descriptor)
    # is also closed when all file objects from makefile() are closed.
    # Once that happens, all future operations on the socket object will fail. 
    # The remote end will receive no more data (after queued data is flushed).
    sock.close()

    # return True if port is open or False if port is closed.
    return connected


con = check_port('www.google.com', 83)
print(con)

Solution 5

One can use threading.Thread and threading.Condition to synchronize port check and spawning new threads.

Script example usage:

python port_scan.py google.com 70 90
Checking 70 - 80
Checking 80 - 84
Checking 84 - 90
Found active port 80
Checking 90 - 91
Checking 91 - 94
All threads started ...

port_scan.py:

# import pdb
import socket, threading
from traceback import print_exc


class AllThreadsStarted(Exception): pass


class IPv4PortScanner(object):
    def __init__(self, domain, timeout=2.0, port_range=(1024, 65535), threadcount=10):
        self.domain               = domain
        self.timeout              = timeout
        self.port_range           = port_range
        self.threadcount          = threadcount
        self._lock                = threading.Lock()
        self._condition           = threading.Condition(self._lock)
        self._ports_active        = []
        self._ports_being_checked = []

        self._next_port = self.port_range[0]

    def check_port_(self, port):
        "If connects then port is active"
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        sock.settimeout(self.timeout)
        try:
            sock.connect((self.domain, port))
            with self._lock:
                self._ports_active.append(port)
            print ("Found active port {}".format(port))
            sock.close()
        except socket.timeout, ex:
            return
        except:
            print_exc()
            # pdb.set_trace()

    def check_port(self, port):
        "updates self._ports_being_checked list on exit of this method"
        try:
            self.check_port_(port)
        finally:
            self._condition.acquire()
            self._ports_being_checked.remove(port)
            self._condition.notifyAll()
            self._condition.release()

    def start_another_thread(self):
        if self._next_port > self.port_range[1]:
            raise AllThreadsStarted()
        port             = self._next_port
        self._next_port += 1
        t = threading.Thread(target=self.check_port, args=(port,))
        # update books
        with self._lock:
            self._ports_being_checked.append(port)
        t.start()

    def run(self):
        try:
            while True:
                self._condition.acquire()
                while len(self._ports_being_checked) >= self.threadcount:
                    # we wait for some threads to complete the task
                    self._condition.wait()
                slots_available = self.threadcount - len(self._ports_being_checked)
                self._condition.release()
                print ("Checking {} - {}".format(self._next_port, self._next_port+slots_available))
                for i in xrange(slots_available):
                    self.start_another_thread()
        except AllThreadsStarted, ex:
            print ("All threads started ...")
        except:
            print_exc()


if __name__ == "__main__":
    import sys
    domain  = sys.argv[1]
    port_s  = int(sys.argv[2])
    port_e  = int(sys.argv[3])
    scanner = IPv4PortScanner(domain=domain, port_range=(port_s, port_e))
    scanner.run()

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