Hooking WSASend/WSASend/Recv/Send with Easyhook and c#

Use a version of Visual Studio that can clone the Git repository and add the following modifications to the project.

using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime.Remoting;
using EasyHook;
using PacketLoggerHook;

namespace PacketLogger
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            if (args.Length != 1)
            {
                Console.Error.WriteLine("Usage: PacketLogger.exe <process_name>");
                //return;
            }

            string channelName = null;

            RemoteHooking.IpcCreateServer<ServerInterface>(ref channelName, WellKnownObjectMode.Singleton);
            var injectionLibrary =
                Path.Combine(
                    Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) ??
                    throw new InvalidOperationException(),
                    "PacketLoggerHook.dll");

            Console.WriteLine("Hooking");
            injectionLibrary = @"C:\Users\UserName\Source\Repos\PacketLogger\PacketLoggerHook\bin\Debug\PacketLoggerHook.dll";

            foreach (var process in Process.GetProcesses())
            {
                if (process.ProcessName == args[0])
                {
                    Console.WriteLine("Found a process: {0}", process.ProcessName);
                    RemoteHooking.Inject(
                        process.Id,
                        injectionLibrary,
                        injectionLibrary,
                        channelName
                    );
                    break;
                }
            }

            Console.WriteLine("Press any key to exit");
            Console.ReadKey();
        }
    }
}

using System;

using System.Diagnostics;

using System.IO;

using System.Reflection;

using System.Runtime.Remoting;

using EasyHook;

using PacketLoggerHook;

namespace PacketLogger

{

internal class Program

{

public static void Main(string[] args)

{

if (args.Length != 1)

{

Console.Error.WriteLine("Usage: PacketLogger.exe <process_name>");

//return;

}

string channelName = null;

RemoteHooking.IpcCreateServer<ServerInterface>(ref channelName, WellKnownObjectMode.Singleton);

var injectionLibrary =

Path.Combine(

Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) ??

throw new InvalidOperationException(),

"PacketLoggerHook.dll");

Console.WriteLine("Hooking");

injectionLibrary = @"C:\Users\UserName\Source\Repos\PacketLogger\PacketLoggerHook\bin\Debug\PacketLoggerHook.dll";

foreach (var process in Process.GetProcesses())

{

if (process.ProcessName == args[0])

{

Console.WriteLine("Found a process: {0}", process.ProcessName);

RemoteHooking.Inject(

process.Id,

injectionLibrary,

channelName

);

break;

}

Console.WriteLine("Press any key to exit");

Console.ReadKey();

}

using System;
using System.Runtime.InteropServices;
using System.Threading;
using EasyHook;

namespace PacketLoggerHook
{
    public class InjectionEntryPoint : IEntryPoint
    {
        private readonly ServerInterface _server;
        private readonly string _channelName;
        private LocalHook _wsaSendHook;
        private LocalHook _wsaRecvHook;
        private LocalHook _SendHook;
        private LocalHook _RecvHook;

        public InjectionEntryPoint(RemoteHooking.IContext context, string channelName)
        {
            _server = RemoteHooking.IpcConnectClient<ServerInterface>(channelName);
            _channelName = channelName;
        }

        public void Run(RemoteHooking.IContext context, string channelName)
        {
            _server.Log("Running");

            _server.IsInstalled(RemoteHooking.GetCurrentProcessId());

            _server.Log("Installed");

            _wsaSendHook = LocalHook.Create(
                LocalHook.GetProcAddress("Ws2_32.dll", "WSASend"),
                new WSASend_Delegate(WSASend_Hook),
                this
            );
            _wsaRecvHook = LocalHook.Create(
                LocalHook.GetProcAddress("Ws2_32.dll", "WSARecv"),
                new WSARecv_Delegate(WSARecv_Hook),
                this
            );

            _wsaSendHook.ThreadACL.SetExclusiveACL(new[] {0});
            _wsaRecvHook.ThreadACL.SetExclusiveACL(new[] {0});

            
            _SendHook = LocalHook.Create(
                LocalHook.GetProcAddress("Ws2_32.dll", "send"),
                new Send_Delegate(Send_Hook),
                this
            );
            _SendHook.ThreadACL.SetExclusiveACL(new[] { 0 });
             
            
            _RecvHook = LocalHook.Create(
                LocalHook.GetProcAddress("Ws2_32.dll", "recv"),
                new Recv_Delegate(Recv_Hook),
                this
            );
            _RecvHook.ThreadACL.SetExclusiveACL(new[] { 0 });
           

            _server.Log("Hook WSASend/WSARecv/Send/Recv installed");

            RemoteHooking.WakeUpProcess();

            while (true)
            {
                Thread.Sleep(500);
            }
        }

        public void Stop()
        {
            _wsaSendHook.Dispose();
            _wsaRecvHook.Dispose();
            _SendHook.Dispose();
            _RecvHook.Dispose();
            LocalHook.Release();
        }

        #region WSASend Hook

        [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]
        delegate int WSASend_Delegate(
            IntPtr s,
            IntPtr lpBuffers,
            uint dwBufferCount,
            IntPtr lpNumberOfBytesSent,
            uint dwFlags,
            uint lpOverlapped,
            uint lpCompletionRoutine
        );

        [DllImport("Ws2_32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern int WSASend(
            IntPtr s,
            IntPtr lpBuffers,
            uint dwBufferCount,
            IntPtr lpNumberOfBytesSent,
            uint dwFlags,
            uint lpOverlapped,
            uint lpCompletionRoutine
        );

        int WSASend_Hook(
            IntPtr s,
            IntPtr lpBuffers,
            uint dwBufferCount,
            IntPtr lpNumberOfBytesSent,
            uint dwFlags,
            uint lpOverlapped,
            uint lpCompletionRoutine
        )
        {
            var result = WSASend(s, lpBuffers, dwBufferCount, lpNumberOfBytesSent, dwFlags, lpOverlapped,
                lpCompletionRoutine);

            var respSize = Marshal.ReadInt32(lpNumberOfBytesSent);
            if (respSize > 0)
            {
                var data = new byte[respSize];
                Marshal.Copy(Marshal.ReadIntPtr(lpBuffers, 4), data, 0, respSize);
                _server.Log("WSASend", data);
            }

            return result;
        }

        #endregion

        #region WSARecv Hook

        [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]
        delegate int WSARecv_Delegate(
            IntPtr s,
            IntPtr lpBuffers,
            uint dwBufferCount,
            IntPtr lpNumberOfBytesRecvd,
            uint lpFlags,
            uint lpOverlapped,
            uint lpCompletionRoutine
        );

        [DllImport("Ws2_32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern int WSARecv(
            IntPtr s,
            IntPtr lpBuffers,
            uint dwBufferCount,
            IntPtr lpNumberOfBytesRecvd,
            uint lpFlags,
            uint lpOverlapped,
            uint lpCompletionRoutine
        );

        int WSARecv_Hook(
            IntPtr s,
            IntPtr lpBuffers,
            uint dwBufferCount,
            IntPtr lpNumberOfBytesRecvd,
            uint lpFlags,
            uint lpOverlapped,
            uint lpCompletionRoutine)
        {
            var result = WSARecv(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpOverlapped,
                lpCompletionRoutine);

            var respSize = Marshal.ReadInt32(lpNumberOfBytesRecvd);
            if (respSize > 0)
            {
                var data = new byte[respSize];
                Marshal.Copy(Marshal.ReadIntPtr(lpBuffers, 4), data, 0, respSize);
                _server.Log("WSARecv", data);
            }

            return result;
        }

        #endregion



        #region Recv Hook

        [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]
        delegate int Recv_Delegate(
            uint s,
            IntPtr buf,
            int len,
            int flags
        );

        [DllImportAttribute("Ws2_32.dll", CallingConvention= CallingConvention.StdCall, SetLastError = true, CharSet = CharSet.Auto)]
        static extern int recv(
            uint s,
            IntPtr buf,
            int len,
            int flags
        );

        int Recv_Hook(
            uint s,
            IntPtr buf,
            int len,
            int flags)
        {
            //_server.Log("recv", System.Text.ASCIIEncoding.ASCII.GetBytes("Got receive request"));
            int result = recv(s, buf, len, flags);
            //_server.Log("recv", System.Text.ASCIIEncoding.ASCII.GetBytes("Got receive done: " + result));
            var respSize = result; //Marshal.ReadInt32(result);
            if (respSize > 0)
            {
                _server.Log("Recv", System.Text.ASCIIEncoding.ASCII.GetBytes(Marshal.PtrToStringAnsi(buf)));
                //var data = new byte[respSize];
                //Marshal.Copy(Marshal.ReadIntPtr(buf, 4), data, 0, respSize);
                //_server.Log("Recv", System.Text.ASCIIEncoding.ASCII.GetBytes(buf));
            }

            return result;
        }

        #endregion

        #region Send Hook

        [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]
        delegate int Send_Delegate(
            IntPtr s,
            //[MarshalAsAttribute(UnmanagedType.LPWStr)] string buf,
            IntPtr buf,
            int len,
            int flags
        );

        [DllImportAttribute("Ws2_32.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true, CharSet = CharSet.Unicode)]
        static extern int send(
            IntPtr s,
            //[MarshalAsAttribute(UnmanagedType.LPWStr)] string buf,
            IntPtr buf,
            int len,
            int flags
        );

        int Send_Hook(
            IntPtr s,
            //[MarshalAsAttribute(UnmanagedType.LPWStr)] string buf,
            IntPtr buf,
            int len,
            int flags
        )
        {
            //_server.Log("send", System.Text.ASCIIEncoding.ASCII.GetBytes("Got Send request " + buf));
            //_server.Log("send2", System.Text.ASCIIEncoding.ASCII.GetBytes(Marshal.PtrToStringAnsi(buf)));
            var result = send(s, buf, len, flags);
            //_server.Log("send", System.Text.ASCIIEncoding.Unicode.GetBytes("Got Send request " + buf));
            //_server.Log("send", System.Text.ASCIIEncoding.ASCII.GetBytes("Got Send done: " + result));

            var respSize = result; //Marshal.ReadInt32(lpNumberOfBytesSent);
            if (respSize > 0)
            {
                var data = new byte[respSize];
                //Marshal.Copy(Marshal.ReadIntPtr(buf, 4), data, 0, respSize);
                Marshal.Copy(buf, data, 0, respSize);
                _server.Log("send", data);
            }

            return result;
        }

        #endregion



    }
}

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using System;

using System.Runtime.InteropServices;

using System.Threading;

using EasyHook;

namespace PacketLoggerHook

{

public class InjectionEntryPoint : IEntryPoint

{

private readonly ServerInterface _server;

private readonly string _channelName;

private LocalHook _wsaSendHook;

private LocalHook _wsaRecvHook;

private LocalHook _SendHook;

private LocalHook _RecvHook;

public InjectionEntryPoint(RemoteHooking.IContext context, string channelName)

{

_server = RemoteHooking.IpcConnectClient<ServerInterface>(channelName);

_channelName = channelName;

}

public void Run(RemoteHooking.IContext context, string channelName)

{

_server.Log("Running");

_server.IsInstalled(RemoteHooking.GetCurrentProcessId());

_server.Log("Installed");

_wsaSendHook = LocalHook.Create(

LocalHook.GetProcAddress("Ws2_32.dll", "WSASend"),

new WSASend_Delegate(WSASend_Hook),

this

);

_wsaRecvHook = LocalHook.Create(

LocalHook.GetProcAddress("Ws2_32.dll", "WSARecv"),

new WSARecv_Delegate(WSARecv_Hook),

this

);

_wsaSendHook.ThreadACL.SetExclusiveACL(new[] {0});

_wsaRecvHook.ThreadACL.SetExclusiveACL(new[] {0});

_SendHook = LocalHook.Create(

LocalHook.GetProcAddress("Ws2_32.dll", "send"),

new Send_Delegate(Send_Hook),

this

);

_SendHook.ThreadACL.SetExclusiveACL(new[] { 0 });

_RecvHook = LocalHook.Create(

LocalHook.GetProcAddress("Ws2_32.dll", "recv"),

new Recv_Delegate(Recv_Hook),

this

);

_RecvHook.ThreadACL.SetExclusiveACL(new[] { 0 });

_server.Log("Hook WSASend/WSARecv/Send/Recv installed");

RemoteHooking.WakeUpProcess();

while (true)

{

Thread.Sleep(500);

}

public void Stop()

{

_wsaSendHook.Dispose();

_wsaRecvHook.Dispose();

_SendHook.Dispose();

_RecvHook.Dispose();

LocalHook.Release();

}

#region WSASend Hook

[UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]

delegate int WSASend_Delegate(

IntPtr s,

IntPtr lpBuffers,

uint dwBufferCount,

IntPtr lpNumberOfBytesSent,

uint dwFlags,

uint lpOverlapped,

uint lpCompletionRoutine

);

[DllImport("Ws2_32.dll", SetLastError = true, CharSet = CharSet.Auto)]

static extern int WSASend(

IntPtr s,

IntPtr lpBuffers,

uint dwBufferCount,

IntPtr lpNumberOfBytesSent,

uint dwFlags,

uint lpOverlapped,

uint lpCompletionRoutine

);

int WSASend_Hook(

IntPtr s,

IntPtr lpBuffers,

uint dwBufferCount,

IntPtr lpNumberOfBytesSent,

uint dwFlags,

uint lpOverlapped,

uint lpCompletionRoutine

)

{

var result = WSASend(s, lpBuffers, dwBufferCount, lpNumberOfBytesSent, dwFlags, lpOverlapped,

lpCompletionRoutine);

var respSize = Marshal.ReadInt32(lpNumberOfBytesSent);

if (respSize > 0)

{

var data = new byte[respSize];

Marshal.Copy(Marshal.ReadIntPtr(lpBuffers, 4), data, 0, respSize);

_server.Log("WSASend", data);

}

return result;

}

#endregion

#region WSARecv Hook

[UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]

delegate int WSARecv_Delegate(

IntPtr s,

IntPtr lpBuffers,

uint dwBufferCount,

IntPtr lpNumberOfBytesRecvd,

uint lpFlags,

uint lpOverlapped,

uint lpCompletionRoutine

);

[DllImport("Ws2_32.dll", SetLastError = true, CharSet = CharSet.Auto)]

static extern int WSARecv(

IntPtr s,

IntPtr lpBuffers,

uint dwBufferCount,

IntPtr lpNumberOfBytesRecvd,

uint lpFlags,

uint lpOverlapped,

uint lpCompletionRoutine

);

int WSARecv_Hook(

IntPtr s,

IntPtr lpBuffers,

uint dwBufferCount,

IntPtr lpNumberOfBytesRecvd,

uint lpFlags,

uint lpOverlapped,

uint lpCompletionRoutine)

{

var result = WSARecv(s, lpBuffers, dwBufferCount, lpNumberOfBytesRecvd, lpFlags, lpOverlapped,

lpCompletionRoutine);

var respSize = Marshal.ReadInt32(lpNumberOfBytesRecvd);

if (respSize > 0)

{

var data = new byte[respSize];

Marshal.Copy(Marshal.ReadIntPtr(lpBuffers, 4), data, 0, respSize);

_server.Log("WSARecv", data);

}

return result;

}

#endregion

#region Recv Hook

[UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]

delegate int Recv_Delegate(

uint s,

IntPtr buf,

int len,

int flags

);

[DllImportAttribute("Ws2_32.dll", CallingConvention= CallingConvention.StdCall, SetLastError = true, CharSet = CharSet.Auto)]

static extern int recv(

uint s,

IntPtr buf,

int len,

int flags

);

int Recv_Hook(

uint s,

IntPtr buf,

int len,

int flags)

{

//_server.Log("recv", System.Text.ASCIIEncoding.ASCII.GetBytes("Got receive request"));

int result = recv(s, buf, len, flags);

//_server.Log("recv", System.Text.ASCIIEncoding.ASCII.GetBytes("Got receive done: " + result));

var respSize = result; //Marshal.ReadInt32(result);

if (respSize > 0)

{

_server.Log("Recv", System.Text.ASCIIEncoding.ASCII.GetBytes(Marshal.PtrToStringAnsi(buf)));

//var data = new byte[respSize];

//Marshal.Copy(Marshal.ReadIntPtr(buf, 4), data, 0, respSize);

//_server.Log("Recv", System.Text.ASCIIEncoding.ASCII.GetBytes(buf));

}

return result;

}

#endregion

#region Send Hook

[UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode, SetLastError = true)]

delegate int Send_Delegate(

IntPtr s,

//[MarshalAsAttribute(UnmanagedType.LPWStr)] string buf,

IntPtr buf,

int len,

int flags

);

[DllImportAttribute("Ws2_32.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true, CharSet = CharSet.Unicode)]

static extern int send(

IntPtr s,

//[MarshalAsAttribute(UnmanagedType.LPWStr)] string buf,

IntPtr buf,

int len,

int flags

);

int Send_Hook(

IntPtr s,

//[MarshalAsAttribute(UnmanagedType.LPWStr)] string buf,

IntPtr buf,

int len,

int flags

)

{

//_server.Log("send", System.Text.ASCIIEncoding.ASCII.GetBytes("Got Send request " + buf));

//_server.Log("send2", System.Text.ASCIIEncoding.ASCII.GetBytes(Marshal.PtrToStringAnsi(buf)));

var result = send(s, buf, len, flags);

//_server.Log("send", System.Text.ASCIIEncoding.Unicode.GetBytes("Got Send request " + buf));

//_server.Log("send", System.Text.ASCIIEncoding.ASCII.GetBytes("Got Send done: " + result));

var respSize = result; //Marshal.ReadInt32(lpNumberOfBytesSent);

if (respSize > 0)

{

var data = new byte[respSize];

//Marshal.Copy(Marshal.ReadIntPtr(buf, 4), data, 0, respSize);

Marshal.Copy(buf, data, 0, respSize);

_server.Log("send", data);

}

return result;

}

#endregion

}

Hooking WSASend/WSASend/Recv/Send with Easyhook and c#

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