制作快速端口扫描器 [英] Making a Fast Port Scanner

问题描述

所以我正在用python制作端口扫描器...

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()

但是这太慢了，我想以某种方式在一段时间不返回任何东西之后能够关闭或破坏代码.

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.

推荐答案

除了设置套接字超时，您还可以应用多线程技术来加速进程.当您有N个端口要扫描时，充其量最多可以快N倍.

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()

这篇关于制作快速端口扫描器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！