Making a Fast Port Scanner

I think that this one snippet could help you : http://www.coderholic.com/python-port-scanner/

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

socket.setdefaulttimeout(0.5)
This will make the program faster!

socket.setdefualttimeout (time)

is used to keep trying to connect with port for perticular time…when you send request and there is timeout set for 2 seconds so it will try to connect with port for 2 seconds….if there will be no response from that port in 2 seconds….it will be count as a dead port

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)

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() 

The following port scanner has a few constants defined at the top that you can modify as needed:

• PURPOSE — help message for the command line
• PORTS — range of ports you would like scanned
• POOL_SIZE — number of processes to scan with
• TIMEOUT — how long to wait for server connection

Feel free to adapt this according to your requirements. Maybe add some command line arguments?

#! /usr/bin/env python3
import argparse
import collections
import itertools
import multiprocessing
import operator
import socket

PURPOSE = 'Scan for open ports on a computer.'
PORTS = range(1 << 16)
POOL_SIZE = 1 << 8
TIMEOUT = 0.01


def main():
    """Get computer to scan, connect with process pool, and show open ports."""
    parser = argparse.ArgumentParser(description=PURPOSE)
    parser.add_argument('host', type=str, help='computer you want to scan')
    host = parser.parse_args().host
    with multiprocessing.Pool(POOL_SIZE, socket.setdefaulttimeout, [TIMEOUT]) 
            as pool:
        results = pool.imap_unordered(test, ((host, port) for port in PORTS))
        servers = filter(operator.itemgetter(0), results)
        numbers = map(operator.itemgetter(1), servers)
        ordered = sorted(numbers)
    print(f'Ports open on {host}:', *format_ports(ordered), sep='n    ')


field_names = 'family', 'socket_type', 'protocol', 'canon_name', 'address'
AddressInfo = collections.namedtuple('AddressInfo', field_names)
del field_names


def test(address):
    """Try connecting to the server and return whether or not it succeeded."""
    host, port = address
    for info in itertools.starmap(AddressInfo, socket.getaddrinfo(host, port)):
        try:
            probe = socket.socket(info.family, info.socket_type, info.protocol)
        except OSError:
            pass
        else:
            try:
                probe.connect(info.address)
            except OSError:
                pass
            else:
                probe.shutdown(socket.SHUT_RDWR)
                return True, port
            finally:
                probe.close()
    return False, port


def format_ports(ports):
    """Convert port numbers into strings and show all associated services."""
    if ports:
        for port in ports:
            try:
                service = socket.getservbyport(port)
            except OSError:
                service = '?'
            yield f'{port:<5} = {service}'
    else:
        yield 'None'


if __name__ == '__main__':
    main()

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()

I’ve just finished tinkering with Concurrent Futures on a port scanner and by God it’s fast:

import concurrent.futures
    
def scan_port(domainip: str, port: int) -> tuple:
        try:
            # Use a faster socket implementation
            s = socket.create_connection((domainip, port), timeout=0.5)
    
            # Check if the connection was successful
            if s:
                return (port, "open")
            else:
                return (port, "closed")
        except Exception as e:
            print(f"Error scanning port {port}: {e}")
            return (port, "error")
    
    openports = {}
    
    # Scan the ports in parallel using the faster scanning code
    with concurrent.futures.ThreadPoolExecutor() as executor:
        futures = [executor.submit(scan_port, domainip, port) for port in range(1, 1024)]
        for future in concurrent.futures.as_completed(futures):
            status = future.result()
            if status[1] == "open":
                openports[status[0]] = status[1]