Question

我为端口扫描

编写了一个python程序

这是我的源代码...

import socket

t_host = str(input("Enter the host to be scanned: "))  

t_ip = socket.gethostbyname(t_host) 

print(t_ip)   

list=[1,3,4,6,7,9,13,17,19,20,21,22,23,24,25,26,30,32,33,37,42,43,49,53,70,79,80,81,82,83,84,85,88,89,90,99,100,106,109,110,111,113,119,125,135,139,143,144,146,161,163,179,199,211,212,222,254,255,256,259,264,280,301,306,311,340,366,389,40]

sock = socket.socket()  

sock.settimeout(1)

for item in list:
    t_port=int(item)
    result = sock.connect_ex((t_ip,t_port)) 
    if result == 0:
        print("Port",t_port,": Opened")
    else:
        print("port",t_port,": Closed")
    sock.close()

print("Port Scanning complete")

当我在列表中使用单个项目时，它会扫描并正确打开/关闭端口。（即）列表中的第一个项目被正确评估，而剩余的未被评估为正确地打开或关闭

例如list=[80]会将输出正确打开。

但是，如果列表包含多个项目，则会为所有端口显示“已关闭”

例如list=[80,23,443,25]的输出为port 80 : Opened，但其余的都关闭了

Answer 1

您不能将同一套接字用于多个连接。您需要在循环中每次创建一个新的套接字。

import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;
import java.io.PrintStream;

public class Index {
      public static void main(String[] args) {
        long startTime = System.nanoTime();
        PrintStream stdout = System.out;
        try {
            File folder = new File(args[0]);
            File[] files = folder.listFiles();
            for (File file : files) {
              String name = file.getName();
              int pos = name.lastIndexOf(".");
              if (pos > 0) {
                  name = name.substring(0, pos);
              }
              Scanner sc;
              sc = new Scanner(file);
              Map<String, String> wordCount = new TreeMap<String, String>();
              int count = 0;
              while(sc.hasNext()) {
                  String word = sc.next();
                  word = word.trim().toLowerCase();
                  int len = word.length(); 
                  count = (int) count + len;
                  int pageNumber = (int) Math.ceil(count / Float.valueOf(args[2]));
                  if(!wordCount.containsKey(word))
                      wordCount.put(word, Integer.toString(pageNumber));
                  else
                      wordCount.put(word, wordCount.get(word) + ", " + Integer.toString(pageNumber));
              }

              // show results
              sc.close();
              PrintStream outputFile = new PrintStream(args[1]+"/"+name+"_output.txt");
              System.setOut(outputFile);
              for(String word : wordCount.keySet())
                  System.out.println(word + " " + wordCount.get(word));
            }
        }
        catch(IOException e) {
            System.out.println("Unable to read from file.");
        }
      long endTime   = System.nanoTime();
      long totalTime = endTime - startTime;
      System.setOut(stdout);
      System.out.println(totalTime / 1000000);
    }
}

摘自socket.close()的文档：

以后对套接字对象的所有操作都会失败。

Answer 2

您的问题与端口列表无关，但是您多次使用的套接字对象。

套接字关闭后，it can not be reused：

将插槽标记为关闭。当关闭makefile（）中的所有文件对象时，基础系统资源（例如文件描述符）也将关闭。一旦发生这种情况，套接字对象上的所有将来操作都会失败。远程端将不再接收任何数据（在清除排队的数据之后）。

您可能要为每个扫描端口创建一个新的套接字：

import socket

t_host = str(input("Enter the host to be scanned: "))
t_ip = socket.gethostbyname(t_host)

print(t_ip)
list=[1,3,4,6,7,9,13,17,19,20,21,22,23,24,25,26,30,32,33,37,42,43,49,53,70,79,80,81,82,83,84,85,88,89,90,99,100,106,109,110,111,113,119,125,135,139,143,144,146,161,163,179,199,211,212,222,254,255,256,259,264,280,301,306,311,340,366,389,40]

for item in list:
    t_port=int(item)

    # create a new socket for each port scanned
    sock = socket.socket()
    sock.settimeout(1)

    # probe port
    result = sock.connect_ex((t_ip,t_port))
    if result == 0:
        print("Port",t_port,": Opened")
    else:
        print("port",t_port,": Closed")
    sock.close()

如何使用python 3.6中的列表解决问题？

2 个答案: