面对互联网、面对黑客相信广大的管理员也好还是用户也好都并不陌生。那你们一定听说过端口扫描器这个名词。XScanner和SuperScanner相信使用过端口扫描器的朋友并不陌生，那么你们有没有想过自己尝试制作端口扫描器呢？今天我们就为大家介绍一下，通过C#自己制作端口扫描器。
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<int> openedPorts = new List<int>();
21 //起始扫描端口
22 static int startPort = 1;
23 //结束端口号
24 static int endPort = 500;
25 //***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) ;#p#
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
通过以上代码我们就可以自己制作端口扫描器了，不过只能实现TCP端口扫描。
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