c#-C# 同時勾send 和 recv ,代碼出錯在哪裡？

C# 同時勾send 和 recv ,代碼出錯在哪裡？

下面的代碼，同時安裝勾子會出錯，現在的代碼只能勾一個函數
private void Form1_Load(object sender, EventArgs e)
{
send_Hook.Install("ws2_32.dll", "send", Marshal.GetFunctionPointerForDelegate(new sendCallback(sendProc)));
send_Hook.Install("ws2_32.dll", "recv", Marshal.GetFunctionPointerForDelegate(new recvCallback(toProc)));
}
怎麼才能即可接截Send，也可Recv

這裡是完整代碼

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Collections;
using System.Runtime.InteropServices;
using api_hook;


namespace api_hook_封包學習
{
  public partial class Form1 : Form
  {
  [DllImport("ws2_32.dll")]
  static extern int send(int s, byte[] buf, int len, int flag);

  [DllImport("ws2_32.dll")]
  static extern int recv(int s, byte[] buf, int len, int flag);

  APIHOOK send_Hook = new APIHOOK();
  delegate int sendCallback(int s, IntPtr buf, int len, int flag);
  delegate int recvCallback(int s, IntPtr buf, int len, int flag);
  public Form1()
  {
  InitializeComponent();
  }

  private void Form1_Load(object sender, EventArgs e)
  {
  send_Hook.Install("ws2_32.dll", "send", Marshal.GetFunctionPointerForDelegate(new sendCallback(sendProc)));
  send_Hook.Install("ws2_32.dll", "recv", Marshal.GetFunctionPointerForDelegate(new recvCallback(toProc)));
  }

  int sendProc(int s, IntPtr buf, int len, int flag)
  {
  byte[] buffer = new byte[len];
  Marshal.Copy(buf, buffer, 0, len); //讀封包數據,讀取後可進行條件修改,攔截,轉發等,記得處理後調用發送   
  send_Hook.Suspend(); //暫停攔截，轉交系統調用   
  int ret = send(s, buffer, len, flag); //發送數據，此處可進行攔截
  send_Hook.Continue(); //恢復HOOK   
  return ret;
  }
  int toProc(int s, IntPtr buf, int len, int flag)
  {
  byte[] buffer = new byte[len];
  Marshal.Copy(buf, buffer, 0, len); //讀封包數據  
  send_Hook.Suspend(); //暫停攔截，轉交系統調用   
  int ret = recv(s, buffer, len, flag); //發送數據，此處可對包進行處理操作
  send_Hook.Continue(); //恢復HOOK   
  return ret;
  }
  private void button1_Click(object sender, EventArgs e)//按下時加載網頁進行測試數據
  {
  webBrowser1.Navigate("http://baidu.com");
  }  
  }
//APIHOOK關鍵代碼類
  public class APIHOOK
  {
  #region Api聲明
  [DllImport("Kernel32.dll", EntryPoint = "GetModuleHandleA", CharSet = CharSet.Ansi)]
  static extern IntPtr GetModuleHandle(
  string lpModuleName
  );
  [DllImport("Kernel32.dll")]
  static extern bool VirtualProtect(
  IntPtr lpAddress,
  int dwSize,
  int flNewProtect,
  ref int lpflOldProtect
  );
  [DllImport("Kernel32.dll", EntryPoint = "lstrcpynA", CharSet = CharSet.Ansi)]
  static extern IntPtr lstrcpyn(
  byte[] lpString1,
  byte[] lpString2,
  int iMaxLength
  );
  [DllImport("Kernel32.dll")]
  static extern IntPtr GetProcAddress(
  IntPtr hModule,
  string lpProcName
  );
  [DllImport("Kernel32.dll")]
  static extern bool FreeLibrary(
  IntPtr hModule
  );
  #endregion
  #region 常量定義表
  const int PAGE_EXECUTE_READWRITE = 0x40;
  #endregion
  #region 變量表
  IntPtr ProcAddress;
  int lpflOldProtect = 0;
  byte[] OldEntry = new byte[5];
  byte[] NewEntry = new byte[5];
  IntPtr OldAddress;
  #endregion
  public APIHOOK() { }
  public APIHOOK(string ModuleName, string ProcName, IntPtr lpAddress)
  {
  Install(ModuleName, ProcName, lpAddress);
  }
  public bool Install(string ModuleName, string ProcName, IntPtr lpAddress)
  {
  IntPtr hModule = GetModuleHandle(ModuleName); //取模塊句柄   
  if (hModule == IntPtr.Zero) return false;
  ProcAddress = GetProcAddress(hModule, ProcName); //取入口地址   
  if (ProcAddress == IntPtr.Zero) return false;
  if (!VirtualProtect(ProcAddress, 5, PAGE_EXECUTE_READWRITE, ref lpflOldProtect)) return false; //修改內存屬性   
  Marshal.Copy(ProcAddress, OldEntry, 0, 5); //讀取前5字節   
  NewEntry = AddBytes(new byte[1] { 233 }, BitConverter.GetBytes((Int32)((Int32)lpAddress - (Int32)ProcAddress - 5))); //計算新入口跳轉   
  Marshal.Copy(NewEntry, 0, ProcAddress, 5); //寫入前5字節   
  OldEntry = AddBytes(OldEntry, new byte[5] { 233, 0, 0, 0, 0 });
  OldAddress = lstrcpyn(OldEntry, OldEntry, 0); //取變量指針   
  Marshal.Copy(BitConverter.GetBytes((double)((Int32)ProcAddress - (Int32)OldAddress - 5)), 0, (IntPtr)(OldAddress.ToInt32() + 6), 4); //保存JMP   
  FreeLibrary(hModule); //釋放模塊句柄   
  return true;
  }
  public void Suspend()
  {
  Marshal.Copy(OldEntry, 0, ProcAddress, 5);
  }
  public void Continue()
  {
  Marshal.Copy(NewEntry, 0, ProcAddress, 5);
  }
  public bool Uninstall()
  {
  if (ProcAddress == IntPtr.Zero) return false;
  Marshal.Copy(OldEntry, 0, ProcAddress, 5);
  ProcAddress = IntPtr.Zero;
  return true;
  }
  static byte[] AddBytes(byte[] a, byte[] b)
  {
  ArrayList retArray = new ArrayList();
  for (int i = 0; i < a.Length; i++)
  {
  retArray.Add(a[i]);
  }
  for (int i = 0; i < b.Length; i++)
  {
  retArray.Add(b[i]);
  }
  return (byte[])retArray.ToArray(typeof(byte));
  }
  }
}

最佳回答：

是因為你的ws2_32.dll裡面已經封裝了Recv的方法，當你加載第二個的時候沖突了。也就是函數沖定義