基于C#实现的端口扫描器实例代码

本文所述为基于c#实现的端口扫描器代码，代码内包括了窗体和逻辑处理两部分代码。在代码中，创建tcpclient对象，把tcpclient用于为tcp网络服务提供客户端连接，创建线程，并创建threadstart委托对象，端口扫描范围为[0-65536]，也可自定义扫描范围。

功能主要代码如下：

using system; 
using system.drawing; 
using system.windows.forms; 
using system.net.sockets; 
using system.threading; 
namespace portscanner 
{ 
 public class form1: system.windows.forms.form 
 { 
 private system.windows.forms.textbox txtaddr; 
 private system.windows.forms.textbox txtstart; 
 private system.windows.forms.textbox txtend; 
 private system.windows.forms.label label1; 
 private system.windows.forms.label label2; 
 private system.windows.forms.label label3; 
 private system.windows.forms.splitter splitter1; 
 private system.windows.forms.listbox lbresult; 
 private system.windows.forms.button btnscan; 
 private system.windows.forms.progressbar progressbar1; 
 private system.windows.forms.label lblstart; 
 private system.windows.forms.label lblstop; 
 private system.windows.forms.label lblnow; 
 //自定义变量
 private int port; 
 private string addr; 
 private bool[] done = new bool[65536]; 
 private int start; 
 private int end; 
 private thread scanthread; 
 private bool ok; 
 public form1() 
 { 
  initializecomponent(); 
 } 
 private void initializecomponent() 
 { 
  this.lbresult = new system.windows.forms.listbox();
  this.txtaddr = new system.windows.forms.textbox();
  this.txtstart = new system.windows.forms.textbox();
  this.txtend = new system.windows.forms.textbox();
  this.label1 = new system.windows.forms.label();
  this.label2 = new system.windows.forms.label();
  this.label3 = new system.windows.forms.label();
  this.splitter1 = new system.windows.forms.splitter();
  this.btnscan = new system.windows.forms.button();
  this.progressbar1 = new system.windows.forms.progressbar();
  this.lblstart = new system.windows.forms.label();
  this.lblstop = new system.windows.forms.label();
  this.lblnow = new system.windows.forms.label();
  this.suspendlayout();
  // 
  // lbresult
  // 
  this.lbresult.dock = system.windows.forms.dockstyle.right;
  this.lbresult.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.lbresult.itemheight = 14;
  this.lbresult.location = new system.drawing.point(224, 0);
  this.lbresult.name = "lbresult";
  this.lbresult.size = new system.drawing.size(264, 270);
  this.lbresult.tabindex = 0;
  // 
  // txtaddr
  // 
  this.txtaddr.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.txtaddr.location = new system.drawing.point(72, 16);
  this.txtaddr.name = "txtaddr";
  this.txtaddr.size = new system.drawing.size(136, 22);
  this.txtaddr.tabindex = 1;
  this.txtaddr.text = "";
  // 
  // txtstart
  // 
  this.txtstart.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.txtstart.location = new system.drawing.point(72, 48);
  this.txtstart.name = "txtstart";
  this.txtstart.size = new system.drawing.size(136, 22);
  this.txtstart.tabindex = 2;
  this.txtstart.text = "";
  this.txtstart.textchanged += new system.eventhandler(this.txtstart_textchanged);
  // 
  // txtend
  // 
  this.txtend.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.txtend.location = new system.drawing.point(72, 80);
  this.txtend.name = "txtend";
  this.txtend.size = new system.drawing.size(136, 22);
  this.txtend.tabindex = 3;
  this.txtend.text = "";
  this.txtend.textchanged += new system.eventhandler(this.txtend_textchanged);
  // 
  // label1
  // 
  this.label1.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.label1.location = new system.drawing.point(8, 16);
  this.label1.name = "label1";
  this.label1.size = new system.drawing.size(64, 23);
  this.label1.tabindex = 4;
  this.label1.text = "主机地址";
  // 
  // label2
  // 
  this.label2.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.label2.location = new system.drawing.point(8, 80);
  this.label2.name = "label2";
  this.label2.size = new system.drawing.size(64, 23);
  this.label2.tabindex = 5;
  this.label2.text = "结束端口";
  // 
  // label3
  // 
  this.label3.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.label3.location = new system.drawing.point(8, 48);
  this.label3.name = "label3";
  this.label3.size = new system.drawing.size(64, 23);
  this.label3.tabindex = 6;
  this.label3.text = "起始端口";
  // 
  // splitter1
  // 
  this.splitter1.dock = system.windows.forms.dockstyle.right;
  this.splitter1.location = new system.drawing.point(221, 0);
  this.splitter1.name = "splitter1";
  this.splitter1.righttoleft = system.windows.forms.righttoleft.yes;
  this.splitter1.size = new system.drawing.size(3, 273);
  this.splitter1.tabindex = 7;
  this.splitter1.tabstop = false;
  // 
  // btnscan
  // 
  this.btnscan.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.btnscan.location = new system.drawing.point(72, 200);
  this.btnscan.name = "btnscan";
  this.btnscan.tabindex = 8;
  this.btnscan.text = "扫描";
  this.btnscan.click += new system.eventhandler(this.btnscan_click);
  // 
  // progressbar1
  // 
  this.progressbar1.location = new system.drawing.point(8, 112);
  this.progressbar1.name = "progressbar1";
  this.progressbar1.size = new system.drawing.size(200, 23);
  this.progressbar1.step = 1;
  this.progressbar1.tabindex = 9;
  // 
  // lblstart
  // 
  this.lblstart.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.lblstart.location = new system.drawing.point(8, 144);
  this.lblstart.name = "lblstart";
  this.lblstart.size = new system.drawing.size(48, 23);
  this.lblstart.tabindex = 10;
  // 
  // lblstop
  // 
  this.lblstop.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.lblstop.location = new system.drawing.point(160, 144);
  this.lblstop.name = "lblstop";
  this.lblstop.size = new system.drawing.size(48, 23);
  this.lblstop.tabindex = 11;
  // 
  // lblnow
  // 
  this.lblnow.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.lblnow.location = new system.drawing.point(84, 144);
  this.lblnow.name = "lblnow";
  this.lblnow.size = new system.drawing.size(48, 23);
  this.lblnow.tabindex = 12;
  this.autoscalebasesize = new system.drawing.size(6, 15);
  this.clientsize = new system.drawing.size(488, 273);
  this.controls.add(this.lblnow);
  this.controls.add(this.lblstop);
  this.controls.add(this.lblstart);
  this.controls.add(this.progressbar1);
  this.controls.add(this.btnscan);
  this.controls.add(this.splitter1);
  this.controls.add(this.label3);
  this.controls.add(this.label2);
  this.controls.add(this.label1);
  this.controls.add(this.txtend);
  this.controls.add(this.txtstart);
  this.controls.add(this.txtaddr);
  this.controls.add(this.lbresult);
  this.font = new system.drawing.font("tahoma", 9f, system.drawing.fontstyle.regular, system.drawing.graphicsunit.point, ((system.byte)(0)));
  this.name = "form1";
  this.text = "端口扫描器";
  this.resumelayout(false);
 } 
 [stathread] 
 static void main() 
 { 
  application.run(new form1()); 
 } 
 private void btnscan_click(object sender, system.eventargs e) 
 { 
  //创建线程，并创建threadstart委托对象
  thread process = new thread(new threadstart(portscan)); 
  process.start(); 
  //显示端口扫描的范围
  progressbar1.minimum = int32.parse(txtstart.text); 
  progressbar1.maximum = int32.parse(txtend.text); 
  //显示框初始化
  lbresult.items.clear(); 
  lbresult.items.add("端口扫描器 v1.0."); 
  lbresult.items.add(""); 
 } 
 private void portscan() 
 { 
  start = int32.parse(txtstart.text); 
  end = int32.parse(txtend.text); 
  //检查输入范围合法性
  if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end)) 
  { 
  lbresult.items.add("开始扫描... (可能需要请您等待几分钟)"); 
  addr = txtaddr.text; 
  for (int i = start; i <= end; i++) 
  { 
   port = i; 
   //使用该端口的扫描线程
   scanthread = new thread(new threadstart(scan)); 
   scanthread.start(); 
   //使线程睡眠
   system.threading.thread.sleep(100); 
   progressbar1.value = i; 
   lblnow.text = i.tostring(); 
  } 
  //未完成时情况
  while (!ok) 
  { 
   ok = true; 
   for (int i = start; i <= end; i++) 
   { 
   if (!done[i]) 
   { 
    ok = false; 
    break; 
   } 
   } 
   system.threading.thread.sleep(1000); 
  } 
  lbresult.items.add("扫描结束!"); 
  } 
  else 
  { 
  messagebox.show("输入错误，端口范围为[0-65536]"); 
  } 
 } 
 private void scan() 
 { 
  int portnow = port; 
  //创建线程变量
  thread threadnow = scanthread; 
  done[portnow] = true; 
  //创建tcpclient对象，tcpclient用于为tcp网络服务提供客户端连接
  tcpclient objtcp = null; 
  //扫描端口，成功则写入信息
  try 
  { 
  //用tcpclient对象扫描端口
  objtcp = new tcpclient(addr, portnow); 
  lbresult.items.add("端口 " + portnow.tostring() + " 开放!"); 
  } 
  catch 
  {
  } 
 } 
 private void txtstart_textchanged(object sender, system.eventargs e) 
 { 
  //获取输入的起始端口值
  lblstart.text = txtstart.text; 
 } 
 private void txtend_textchanged(object sender, system.eventargs e) 
 { 
  //获取输入的接受端口值
  lblstop.text = txtend.text; 
 } 
 } 
}