黑客教程:利用C#设计制作端口扫描器
今天主要使用到的是System.Net和System.Threading名称空间。


1
2using System;
3using System.Collections.Generic;
4using System.Text;
5
6using System.Net;
7using System.Net.Sockets;
8
9using System.Threading;
10
11namespace PortScanner
12{
13 class Program
14 {
15 　//已扫描端口数目
16 　internal static int scannedCount = 0;
17 　//正在运行的线程数目
18 　internal static int runningThreadCount = 0;
19 　//打开的端口数目
20 　internal static List openedPorts = new List();
21 　//起始扫描端口
22 　static int startPort = 1;
23 　//结束端口号
24 　static int endPort = 500;
25 　//最大工作线程数
26 　static int maxThread = 100;
27 　static void Main(string[] args)
28 　{
29 //接收传入参数一作为要扫描的主机
30 string host = args[0];
31 //接收传入参数二作为端口扫描范围，如1-4000
32 string portRange = args[1];
33 startPort = int.Parse(portRange.Split('-')[0].Trim());
34 endPort = int.Parse(portRange.Split('-')[1].Trim());
35
36 for (int port = startPort; port < endPort; port++)
37 {
38 　//创建扫描类
39 　Scanner scanner = new Scanner(host, port);
40 　Thread thread = new Thread(new ThreadStart(scanner.Scan));
41 　thread.Name = port.ToString();
42 　thread.IsBackground = true;
43 　//启动扫描线程
44 　thread.Start();
45
46 　runningThreadCount++;
47
48 　Thread.Sleep(10);
49 　//循环，直到某个线程工作完毕才启动另一新线程，也可以叫做推拉窗技术
50 　while (runningThreadCount >= maxThread) ;
51 }
52
53 //空循环，直到所有端口扫描完毕
54 while (scannedCount + 1 < (endPort - startPort)) ;
55
56 　Console.WriteLine();
57 　Console.WriteLine();
58 　//输出结果
59 　Console.WriteLine("Scan for host: {0} has been completed , \n total {1} ports
scanned, \nopened ports :{2}",
60 host, (endPort - startPort), openedPorts.Count);
61
62 foreach (int port in openedPorts)
63 　Console.WriteLine("\tPort: {0} is open", port.ToString().PadLeft(6));
64 　}
65 }
66
67 //扫描类
68 class Scanner
69 {
70 　string m_host;
71 　int m_port;
72　
73 　public Scanner(string host, int port)
74 　{
75 m_host = host; m_port = port;
76 　}
77
78 　public void Scan()
79 　{
80 //我们直接使用比较高级的TcpClient类
81 TcpClient tc = new TcpClient();
82 //设置超时时间
83 tc.SendTimeout = tc.ReceiveTimeout = 2000;
84 try
85 {
86 　//Console.Write("Checking port: {0}", m_port);
87 　//尝试连接
88 　tc.Connect(m_host, m_port);
89 　if (tc.Connected)
90 　{
91 //如果连接上，证明此商品为开放状态
92 Console.WriteLine("Port {0} is Open", m_port.ToString().PadRight(6));
93 Program.openedPorts.Add(m_port);
94 　}
95 }
96 catch (System.Net.Sockets.SocketException e)
97 {
98 　//容错处理
99 　Console.WriteLine("Port {0} is closed", m_port.ToString().PadRight(6));
100　 //Console.WriteLine(e.Message);
101 }
102 finally
103 {
104　 tc.Close();
105　 tc = null;
106　 Program.scannedCount++;
107　 Program.runningThreadCount--;
108
109　 //Console.WriteLine(Program.scannedCount);
110
111 }
112　 }
113 }
114}
115
116
117


好了，代码很简单吧！只能扫描TCP端口哦。