C# 扫描指定ip端口
醉意丶千层梦 人气:0一、单线程扫描
1.代码
using System;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace SingleThreadScanningPort
{
public partial class Form1 : Form
{
private bool[] ports = new bool[65536];//所有端口号
private static int port=0;//当前端口号
private static int count = 0;//开放端口号数量
public Form1()
{
InitializeComponent();
//CheckForIllegalCrossThreadCalls设置为false；然后就能安全的访问窗体控件
CheckForIllegalCrossThreadCalls = false;
//初始化进度显示为空
label2.Text = "";
//停止扫描按钮为不可用
stopScanning.Enabled = false;
}
private void beginScanning_Click(object sender, EventArgs e)
{
//检查端口号
if (int.Parse(beginPortText.Text) < 0 || int.Parse(beginPortText.Text) > int.Parse(endPortText.Text) || int.Parse(endPortText.Text) > 65565)
{
messages.Items.Add("端口错误!");
return;
}
//新建线程执行扫描端口函数
Thread procss = new Thread(new ThreadStart(ScanningPort));
procss.Start();
//设置进度条最大值最小值分别为结束端口和起始端口
progressBar1.Maximum = int.Parse(endPortText.Text) - int.Parse(beginPortText.Text);
progressBar1.Minimum = 0;
//判断是否为继续扫描
if (port == 0)
{
messages.Items.Clear();
messages.Items.Add("开始扫描.......");
}
else
messages.Items.Add("继续扫描......");
//开始扫描禁用,停止扫描启用
beginScanning.Enabled = false;
stopScanning.Enabled = true;
}
public void ScanningPort()
{
int start;
int end = int.Parse(endPortText.Text);
//判断是否为继续扫描,如果是则继续扫描,否则重新扫描
if (port != 0)
start = port;
else
start = int.Parse(beginPortText.Text);
messages.Items.Add("起始端口" + start);
messages.Items.Add("结束端口" + end);
for (int i = start; i <= end; i++)
{
//按下停止扫描后开始扫描按钮启用,此时停止扫描
if (beginScanning.Enabled)
break;
port = i;
//新建线程进行扫描
Thread thread = new Thread(Scanning);
thread.Start();
//主线程休眠10ms
System.Threading.Thread.Sleep(10);
//修改进度条的值
progressBar1.Value = i- int.Parse(beginPortText.Text);
//显示端口号以及进度
label2.Text = "正在扫描端口: " + i+" 进度: "+Math.Round(( (i - int.Parse(beginPortText.Text)) *100.0 / progressBar1.Maximum),2)+"%";
progressBar1.PerformStep();
}
if (port != 0)
beginScanning.Text = "继续扫描";
else
{
messages.Items.Add("端口扫描结束");
messages.Items.Add("共有 " + count + " 个端口开放");
}
beginScanning.Enabled = true;
stopScanning.Enabled = false;
//判断是否扫描完毕
if (int.Parse(endPortText.Text) == port)
{
port = 0;
beginScanning.Text = "开始扫描";
}
}
public void Scanning()
{
this.ports[port] = true;
try
{
TcpClient tmp = new TcpClient(ipAddressText.Text, port);
messages.Items.Add("端口" + port + "开放");
count++;
}
catch (System.Exception ex)
{
}
}
private void stopScanning_Click(object sender, EventArgs e)
{
//按下停止按钮后,开始按钮和停止按钮状态翻转
beginScanning.Enabled = true;
stopScanning.Enabled = false;
}
}
}
2.界面
3.结果
由于是单线程执行，在扫描端口的时候程序会直接卡死。所以只简单扫描几个端口
4.抓包
由于是通过以太网发送的，建议先注销哆点再进行抓包，减少数据。
可以发现3900端口成功实现三次握手，即该端口是开放的。而其他端口（红色）则是无法建立连接，意味着是关闭的。
二、多线程扫描
1.代码
using System;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace SingleThreadScanningPort
{
public partial class Form1 : Form
{
private bool[] ports = new bool[65536];//所有端口号
private static int port=0;//当前端口号
private static int count = 0;//开放端口号数量
public Form1()
{
InitializeComponent();
//CheckForIllegalCrossThreadCalls设置为false；然后就能安全的访问窗体控件
CheckForIllegalCrossThreadCalls = false;
//初始化进度显示为空
label2.Text = "";
//停止扫描按钮为不可用
stopScanning.Enabled = false;
}
private void beginScanning_Click(object sender, EventArgs e)
{
//检查端口号
if (int.Parse(beginPortText.Text) < 0 || int.Parse(beginPortText.Text) > int.Parse(endPortText.Text) || int.Parse(endPortText.Text) > 65565)
{
messages.Items.Add("端口错误!");
return;
}
//新建线程执行扫描端口函数
Thread procss = new Thread(new ThreadStart(ScanningPort));
procss.Start();
//设置进度条最大值最小值分别为结束端口和起始端口
progressBar1.Maximum = int.Parse(endPortText.Text) - int.Parse(beginPortText.Text);
progressBar1.Minimum = 0;
//判断是否为继续扫描
if (port == 0)
{
messages.Items.Clear();
messages.Items.Add("开始扫描.......");
}
else
messages.Items.Add("继续扫描......");
//开始扫描禁用,停止扫描启用
beginScanning.Enabled = false;
stopScanning.Enabled = true;
}
public void ScanningPort()
{
int start;
int end = int.Parse(endPortText.Text);
//判断是否为继续扫描,如果是则继续扫描,否则重新扫描
if (port != 0)
start = port;
else
start = int.Parse(beginPortText.Text);
messages.Items.Add("起始端口" + start);
messages.Items.Add("结束端口" + end);
for (int i = start; i <= end; i++)
{
//按下停止扫描后开始扫描按钮启用,此时停止扫描
if (beginScanning.Enabled)
break;
port = i;
//新建线程进行扫描
Thread thread = new Thread(Scanning);
thread.Start();
//主线程休眠10ms
System.Threading.Thread.Sleep(10);
//修改进度条的值
progressBar1.Value = i- int.Parse(beginPortText.Text);
//显示端口号以及进度
label2.Text = "正在扫描端口: " + i+" 进度: "+Math.Round(( (i - int.Parse(beginPortText.Text)) *100.0 / progressBar1.Maximum),2)+"%";
progressBar1.PerformStep();
}
if (port != 0)
beginScanning.Text = "继续扫描";
else
{
messages.Items.Add("端口扫描结束");
messages.Items.Add("共有 " + count + " 个端口开放");
}
beginScanning.Enabled = true;
stopScanning.Enabled = false;
//判断是否扫描完毕
if (int.Parse(endPortText.Text) == port)
{
port = 0;
beginScanning.Text = "开始扫描";
}
}
public void Scanning()
{
this.ports[port] = true;
try
{
TcpClient tmp = new TcpClient(ipAddressText.Text, port);
messages.Items.Add("端口" + port + "开放");
count++;
}
catch (System.Exception ex)
{
}
}
private void stopScanning_Click(object sender, EventArgs e)
{
//按下停止按钮后,开始按钮和停止按钮状态翻转
beginScanning.Enabled = true;
stopScanning.Enabled = false;
}
}
}
2.界面
3.结果
不会出现单线程的卡死，扫描速度也大大提升。同时可以随时开始和暂停操作。
4.抓包
和单线程的抓包思路以及结果都是一样的
三、总结
单线程操作的时候会出现界面直接卡死并且扫描速度很慢，
多线程操作扫描速度大大提升而且不会出现界面卡死。
四、源码
1.github
https://github.com/TangtangSix/SingleThreadScanningPort
https://github.com/TangtangSix/MultithreadingScanningPort
2.gitee
https://gitee.com/tangtangsix/SingleThreadScanningPort
https://gitee.com/tangtangsix/MultithreadingScanningPort
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