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Hook into ws2_32.dll's recv function fail, under CefSharp.Wp

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0

When I trying to hook into ws2_32.dll's recv function, under CefSharp.Wpf. When I started debugging the program, I won't hook any more after receiving a few packets, but I can see recv packets in Winsock Packet Editor, It looks like the hook stop working. I don't know what happened. Take a look at the code:

using CefSharp;
using EasyHook;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;

namespace HookTest

 public partial class MainWindow : Window
 
 public MainWindow()
 
 InitializeComponent();
 // Thread.Sleep(20 * 1000);
 InitBrowser();
 InstallHook();
 

 void InitBrowser()
 
 var settings = new CefSharp.Wpf.CefSettings();

 Cef.Initialize(settings);
 var cefBrowser = new CefSharp.Wpf.ChromiumWebBrowser
 
 Address = "https://github.com"
 ;
 panel.Children.Add(cefBrowser);
 

 void InstallHook()
 
 List<LocalHook> hooks = new List<LocalHook>
 
 LocalHook.Create(LocalHook.GetProcAddress("Ws2_32.dll", "recv"), new Ws2_32.Drecv(RecvHook), null),
 ;
 foreach (LocalHook hook in hooks)
 
 hook.ThreadACL.SetExclusiveACL(new int[] 0 );
 
 

 public int RecvHook(IntPtr s, IntPtr buf, int len, int flags)
 
 int num = 0;
 try
 
 num = Ws2_32.recv(s, buf, len, flags);
 Debug.WriteLine("recv buffer:" + num);
 
 catch (Exception e)
 
 Debug.WriteLine(e.Message);
 
 return num;
 
 

 class Ws2_32
 
 [DllImport("WS2_32.dll")]
 public static extern int recv(IntPtr s, IntPtr buf, int len, int flags);

 [UnmanagedFunctionPointer(CallingConvention.StdCall, SetLastError = true)]
 public delegate int Drecv(IntPtr s, IntPtr buf, int len, int flags);
 

c# easyhook

share|improve this question

asked Mar 24 at 15:00

40robber40robber

225

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried storing your hooks in a class member rather than local list? They will probably get cleaned up by the Garbage collector otherwise (which will uninstall the hook).
  
  – Justin Stenning
  Mar 29 at 20:47
  

  
  
  
  

add a comment | 

0

When I trying to hook into ws2_32.dll's recv function, under CefSharp.Wpf. When I started debugging the program, I won't hook any more after receiving a few packets, but I can see recv packets in Winsock Packet Editor, It looks like the hook stop working. I don't know what happened. Take a look at the code:

using CefSharp;
using EasyHook;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;

namespace HookTest

 public partial class MainWindow : Window
 
 public MainWindow()
 
 InitializeComponent();
 // Thread.Sleep(20 * 1000);
 InitBrowser();
 InstallHook();
 

 void InitBrowser()
 
 var settings = new CefSharp.Wpf.CefSettings();

 Cef.Initialize(settings);
 var cefBrowser = new CefSharp.Wpf.ChromiumWebBrowser
 
 Address = "https://github.com"
 ;
 panel.Children.Add(cefBrowser);
 

 void InstallHook()
 
 List<LocalHook> hooks = new List<LocalHook>
 
 LocalHook.Create(LocalHook.GetProcAddress("Ws2_32.dll", "recv"), new Ws2_32.Drecv(RecvHook), null),
 ;
 foreach (LocalHook hook in hooks)
 
 hook.ThreadACL.SetExclusiveACL(new int[] 0 );
 
 

 public int RecvHook(IntPtr s, IntPtr buf, int len, int flags)
 
 int num = 0;
 try
 
 num = Ws2_32.recv(s, buf, len, flags);
 Debug.WriteLine("recv buffer:" + num);
 
 catch (Exception e)
 
 Debug.WriteLine(e.Message);
 
 return num;
 
 

 class Ws2_32
 
 [DllImport("WS2_32.dll")]
 public static extern int recv(IntPtr s, IntPtr buf, int len, int flags);

 [UnmanagedFunctionPointer(CallingConvention.StdCall, SetLastError = true)]
 public delegate int Drecv(IntPtr s, IntPtr buf, int len, int flags);
 

c# easyhook

share|improve this question

asked Mar 24 at 15:00

40robber40robber

225

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you tried storing your hooks in a class member rather than local list? They will probably get cleaned up by the Garbage collector otherwise (which will uninstall the hook).
  
  – Justin Stenning
  Mar 29 at 20:47
  

  
  
  
  

add a comment | 

When I trying to hook into ws2_32.dll's recv function, under CefSharp.Wpf. When I started debugging the program, I won't hook any more after receiving a few packets, but I can see recv packets in Winsock Packet Editor, It looks like the hook stop working. I don't know what happened. Take a look at the code:

using CefSharp;
using EasyHook;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;

namespace HookTest

 public partial class MainWindow : Window
 
 public MainWindow()
 
 InitializeComponent();
 // Thread.Sleep(20 * 1000);
 InitBrowser();
 InstallHook();
 

 void InitBrowser()
 
 var settings = new CefSharp.Wpf.CefSettings();

 Cef.Initialize(settings);
 var cefBrowser = new CefSharp.Wpf.ChromiumWebBrowser
 
 Address = "https://github.com"
 ;
 panel.Children.Add(cefBrowser);
 

 void InstallHook()
 
 List<LocalHook> hooks = new List<LocalHook>
 
 LocalHook.Create(LocalHook.GetProcAddress("Ws2_32.dll", "recv"), new Ws2_32.Drecv(RecvHook), null),
 ;
 foreach (LocalHook hook in hooks)
 
 hook.ThreadACL.SetExclusiveACL(new int[] 0 );
 
 

 public int RecvHook(IntPtr s, IntPtr buf, int len, int flags)
 
 int num = 0;
 try
 
 num = Ws2_32.recv(s, buf, len, flags);
 Debug.WriteLine("recv buffer:" + num);
 
 catch (Exception e)
 
 Debug.WriteLine(e.Message);
 
 return num;
 
 

 class Ws2_32
 
 [DllImport("WS2_32.dll")]
 public static extern int recv(IntPtr s, IntPtr buf, int len, int flags);

 [UnmanagedFunctionPointer(CallingConvention.StdCall, SetLastError = true)]
 public delegate int Drecv(IntPtr s, IntPtr buf, int len, int flags);
 

c# easyhook

share|improve this question

asked Mar 24 at 15:00

40robber40robber

225

using CefSharp;
using EasyHook;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;

namespace HookTest

 public partial class MainWindow : Window
 
 public MainWindow()
 
 InitializeComponent();
 // Thread.Sleep(20 * 1000);
 InitBrowser();
 InstallHook();
 

 void InitBrowser()
 
 var settings = new CefSharp.Wpf.CefSettings();

 Cef.Initialize(settings);
 var cefBrowser = new CefSharp.Wpf.ChromiumWebBrowser
 
 Address = "https://github.com"
 ;
 panel.Children.Add(cefBrowser);
 

 void InstallHook()
 
 List<LocalHook> hooks = new List<LocalHook>
 
 LocalHook.Create(LocalHook.GetProcAddress("Ws2_32.dll", "recv"), new Ws2_32.Drecv(RecvHook), null),
 ;
 foreach (LocalHook hook in hooks)
 
 hook.ThreadACL.SetExclusiveACL(new int[] 0 );
 
 

 public int RecvHook(IntPtr s, IntPtr buf, int len, int flags)
 
 int num = 0;
 try
 
 num = Ws2_32.recv(s, buf, len, flags);
 Debug.WriteLine("recv buffer:" + num);
 
 catch (Exception e)
 
 Debug.WriteLine(e.Message);
 
 return num;
 
 

 class Ws2_32
 
 [DllImport("WS2_32.dll")]
 public static extern int recv(IntPtr s, IntPtr buf, int len, int flags);

 [UnmanagedFunctionPointer(CallingConvention.StdCall, SetLastError = true)]
 public delegate int Drecv(IntPtr s, IntPtr buf, int len, int flags);
 

share|improve this question

asked Mar 24 at 15:00

40robber40robber

225

share|improve this question

asked Mar 24 at 15:00

40robber40robber

225

asked Mar 24 at 15:00

40robber40robber

225

asked Mar 24 at 15:00

40robber40robber

225