SimpleRemoter/client/IOCPClient.cpp

// IOCPClient.cpp: implementation of the IOCPClient class.
//
//////////////////////////////////////////////////////////////////////
#ifdef _WIN32
#include "stdafx.h"
#include <WS2tcpip.h>
#else
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netinet/in.h>  // For struct sockaddr_in
#include <unistd.h>      // For close()
#include <cstring>       // For memset()
inline int WSAGetLastError()
{
    return -1;
}
#define USING_COMPRESS 1
#endif
#include "IOCPClient.h"
#include <assert.h>
#include <string>
#if USING_ZLIB
#include "zlib/zlib.h"
#define Z_FAILED(p) (Z_OK != (p))
#define Z_SUCCESS(p) (!Z_FAILED(p))
#else
#include "common/zstd_wrapper.h"
#ifdef _WIN64
#pragma comment(lib, "zstd/zstd_x64.lib")
#else
#pragma comment(lib, "zstd/zstd.lib")
#endif
#define Z_FAILED(p) ZSTD_isError(p)
#define Z_SUCCESS(p) (!Z_FAILED(p))
#define ZSTD_CLEVEL ZSTD_CLEVEL_DEFAULT
#if USING_CTX
#define compress(dest, destLen, source, sourceLen) zstd_compress_auto(m_Cctx, dest, *(destLen), source, sourceLen, 1024*1024)
#define uncompress(dest, destLen, source, sourceLen) ZSTD_decompressDCtx(m_Dctx, dest, *(destLen), source, sourceLen)
#else
#define compress(dest, destLen, source, sourceLen) ZSTD_compress(dest, *(destLen), source, sourceLen, ZSTD_CLEVEL_DEFAULT)
#define uncompress(dest, destLen, source, sourceLen) ZSTD_decompress(dest, *(destLen), source, sourceLen)
#endif
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

#ifndef _WIN32
BOOL SetKeepAliveOptions(int socket, int nKeepAliveSec = 180)
{
    // 启用 TCP 保活选项
    int enable = 1;
    if (setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE, &enable, sizeof(enable)) < 0) {
        Mprintf("Failed to enable TCP keep-alive\n");
        return FALSE;
    }

    // 设置 TCP_KEEPIDLE (3分钟空闲后开始发送 keep-alive 包)
    if (setsockopt(socket, IPPROTO_TCP, TCP_KEEPIDLE, &nKeepAliveSec, sizeof(nKeepAliveSec)) < 0) {
        Mprintf("Failed to set TCP_KEEPIDLE\n");
        return FALSE;
    }

    // 设置 TCP_KEEPINTVL (5秒的重试间隔)
    int keepAliveInterval = 5;  // 5秒
    if (setsockopt(socket, IPPROTO_TCP, TCP_KEEPINTVL, &keepAliveInterval, sizeof(keepAliveInterval)) < 0) {
        Mprintf("Failed to set TCP_KEEPINTVL\n");
        return FALSE;
    }

    // 设置 TCP_KEEPCNT (最多5次探测包后认为连接断开)
    int keepAliveProbes = 5;
    if (setsockopt(socket, IPPROTO_TCP, TCP_KEEPCNT, &keepAliveProbes, sizeof(keepAliveProbes)) < 0) {
        Mprintf("Failed to set TCP_KEEPCNT\n");
        return FALSE;
    }

    Mprintf("TCP keep-alive settings applied successfully\n");
    return TRUE;
}
#endif

VOID IOCPClient::setManagerCallBack(void* Manager,  DataProcessCB dataProcess)
{
    m_Manager = Manager;

    m_DataProcess = dataProcess;
}


IOCPClient::IOCPClient(const State&bExit, bool exit_while_disconnect, int mask, int encoder,
                       const std::string& pubIP) : g_bExit(bExit)
{
    m_sLocPublicIP = pubIP;
    m_ServerAddr = {};
    m_nHostPort = 0;
    m_Manager = NULL;
    m_masker = mask ? new HttpMask(DEFAULT_HOST) : new PkgMask();
    auto enc = GetHeaderEncoder(HeaderEncType(time(nullptr) % HeaderEncNum));
    m_EncoderType = encoder;
    m_Encoder = encoder ? new HellEncoder(enc, new XOREncoder16()) : new ProtocolEncoder();
#ifdef _WIN32
    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);
#endif

    m_sClientSocket = INVALID_SOCKET;
    m_hWorkThread   = NULL;
    m_bWorkThread = S_STOP;

    m_bIsRunning = TRUE;
    m_bConnected = FALSE;

    m_exit_while_disconnect = exit_while_disconnect;
#if USING_CTX
    m_Cctx = ZSTD_createCCtx();
    m_Dctx = ZSTD_createDCtx();
    auto n = ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_nbWorkers, 0);
    if (Z_FAILED(n)) {
        ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_nbWorkers, 0);
    }
    ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_compressionLevel, ZSTD_CLEVEL);
    ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_hashLog, 15);
    ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_chainLog, 16);
    ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_searchLog, 1);
    ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_windowLog, 19);
#endif
}

void IOCPClient::SetMultiThreadCompress(int threadNum)
{
#if USING_CTX
    BOOL failed = TRUE;
    if (threadNum > 1) {
        failed = Z_FAILED(ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_nbWorkers, threadNum));
    }
    if (failed) {
        ZSTD_CCtx_setParameter(m_Cctx, ZSTD_c_nbWorkers, 0);
    }
#endif
}

IOCPClient::~IOCPClient()
{
    m_bIsRunning = FALSE;
    Disconnect();

    if (m_hWorkThread!=NULL) {
        CloseHandle(m_hWorkThread);
        m_hWorkThread = NULL;
    }

#ifdef _WIN32
    WSACleanup();
#endif

    while (S_RUN == m_bWorkThread)
        Sleep(10);

    m_bWorkThread = S_END;
#if USING_CTX
    ZSTD_freeCCtx(m_Cctx);
    ZSTD_freeDCtx(m_Dctx);
#endif
    m_masker->Destroy();
    SAFE_DELETE(m_Encoder);
}

// 从域名获取IP地址
std::string GetIPAddress(const char *hostName)
{
#ifdef _WIN32
    struct sockaddr_in sa = { 0 };
    if (inet_pton(AF_INET, hostName, &(sa.sin_addr)) == 1) {
        return hostName;
    }
    struct hostent *host = gethostbyname(hostName);
#ifdef _DEBUG
    if (host == NULL) return "";
    Mprintf("此域名的IP类型为: %s.\n", host->h_addrtype == AF_INET ? "IPV4" : "IPV6");
    for (int i = 0; host->h_addr_list[i]; ++i)
        Mprintf("获取的第%d个IP: %s\n", i+1, inet_ntoa(*(struct in_addr*)host->h_addr_list[i]));
#endif
    if (host == NULL || host->h_addr_list == NULL)
        return "";
    return host->h_addr_list[0] ? inet_ntoa(*(struct in_addr*)host->h_addr_list[0]) : "";
#else
    struct addrinfo hints, * res;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_INET; // IPv4
    hints.ai_socktype = SOCK_STREAM; // TCP socket

    int status = getaddrinfo(hostName, nullptr, &hints, &res);
    if (status != 0) {
        Mprintf("getaddrinfo failed: %s\n", gai_strerror(status));
        return "";
    }

    struct sockaddr_in* addr = reinterpret_cast<struct sockaddr_in*>(res->ai_addr);
    char ip[INET_ADDRSTRLEN];
    inet_ntop(AF_INET, &(addr->sin_addr), ip, sizeof(ip));

    Mprintf("IP Address: %s \n", ip);

    freeaddrinfo(res); // 不要忘记释放地址信息
    return ip;
#endif
}

BOOL ConnectWithTimeout(SOCKET sock, SOCKADDR *addr, int timeout_sec=5)
{
    // 临时设为非阻塞
    u_long mode = 1;
    ioctlsocket(sock, FIONBIO, &mode);

    // 发起连接（非阻塞）
    int ret = connect(sock, addr, sizeof(*addr));
    if (ret == SOCKET_ERROR) {
        int err = WSAGetLastError();
        if (err != WSAEWOULDBLOCK && err != WSAEINPROGRESS) {
            return FALSE;
        }
    }

    // 等待可写（代表连接完成或失败）
    fd_set writefds;
    FD_ZERO(&writefds);
    FD_SET(sock, &writefds);

    timeval tv;
    tv.tv_sec = timeout_sec;
    tv.tv_usec = 0;

    ret = select(0, NULL, &writefds, NULL, &tv);
    if (ret <= 0 || !FD_ISSET(sock, &writefds)) {
        return FALSE; // 超时或出错
    }

    // 检查连接是否真正成功
    int error = 0;
    int len = sizeof(error);
    getsockopt(sock, SOL_SOCKET, SO_ERROR, (char*)&error, &len);
    if (error != 0) {
        return FALSE;
    }

    // 改回阻塞模式
    mode = 0;
    ioctlsocket(sock, FIONBIO, &mode);

    return TRUE;
}

BOOL IOCPClient::ConnectServer(const char* szServerIP, unsigned short uPort)
{
    if (szServerIP != NULL && uPort != 0) {
        SetServerAddress(szServerIP, uPort);
    }
    m_sCurIP = m_Domain.SelectIP();
    m_masker->SetServer(m_sCurIP.c_str());
    unsigned short port = m_nHostPort;

    m_sClientSocket = socket(AF_INET,SOCK_STREAM, IPPROTO_TCP);    //传输层

    if (m_sClientSocket == SOCKET_ERROR) {
        return FALSE;
    }

#ifdef _WIN32
    m_ServerAddr.sin_family	= AF_INET;
    m_ServerAddr.sin_port	= htons(port);
    m_ServerAddr.sin_addr.S_un.S_addr = inet_addr(m_sCurIP.c_str());

    if (!ConnectWithTimeout(m_sClientSocket,(SOCKADDR *)&m_ServerAddr)) {
        if (m_sClientSocket!=INVALID_SOCKET) {
            closesocket(m_sClientSocket);
            m_sClientSocket = INVALID_SOCKET;
        }
        return FALSE;
    }
#else
    m_ServerAddr.sin_family = AF_INET;
    m_ServerAddr.sin_port = htons(port);
    // 若szServerIP非数字开头，则认为是域名，需进行IP转换
    // 使用 inet_pton 替代 inet_addr (inet_pton 可以支持 IPv4 和 IPv6)
    if (inet_pton(AF_INET, m_sCurIP.c_str(), &m_ServerAddr.sin_addr) <= 0) {
        Mprintf("Invalid address or address not supported\n");
        return false;
    }

    // 创建套接字
    if (m_sClientSocket == -1) {
        Mprintf("Failed to create socket\n");
        return false;
    }

    // 连接到服务器
    if (connect(m_sClientSocket, (struct sockaddr*)&m_ServerAddr, sizeof(m_ServerAddr)) == -1) {
        Mprintf("Connection failed\n");
        close(m_sClientSocket);
        m_sClientSocket = -1;  // 标记套接字无效
        return false;
    }
#endif

    const int chOpt = 1; // True

    // 启用 TCP_NODELAY 禁用 Nagle 算法，减少小包延迟
    int nodelay = 1;
    setsockopt(m_sClientSocket, IPPROTO_TCP, TCP_NODELAY, (char*)&nodelay, sizeof(nodelay));

    // 增大发送缓冲区到 256KB
    int sendBufSize = 256 * 1024;
    setsockopt(m_sClientSocket, SOL_SOCKET, SO_SNDBUF, (char*)&sendBufSize, sizeof(sendBufSize));

    // Set KeepAlive 开启保活机制, 防止服务端产生死连接
    if (setsockopt(m_sClientSocket, SOL_SOCKET, SO_KEEPALIVE,
                   (char *)&chOpt, sizeof(chOpt)) == 0) {
#ifdef _WIN32
        // 设置超时详细信息
        tcp_keepalive	klive;
        klive.onoff = 1; // 启用保活
        klive.keepalivetime = 1000 * 60 * 3; // 3分钟超时 Keep Alive
        klive.keepaliveinterval = 1000 * 5;  // 重试间隔为5秒 Resend if No-Reply
        WSAIoctl(m_sClientSocket, SIO_KEEPALIVE_VALS,&klive,sizeof(tcp_keepalive),
                 NULL,	0,(unsigned long *)&chOpt,0,NULL);
#else
        // 设置保活选项
        SetKeepAliveOptions(m_sClientSocket);
#endif
    }
    m_bConnected = TRUE;
    Mprintf("连接服务端成功.\n");

    if (m_hWorkThread == NULL) {
#ifdef _WIN32
        m_hWorkThread = (HANDLE)__CreateThread(NULL, 0, WorkThreadProc,(LPVOID)this, 0, NULL);
        m_bWorkThread = m_hWorkThread ? S_RUN : S_STOP;
#else
        pthread_t id = 0;
        m_hWorkThread = (HANDLE)pthread_create(&id, nullptr, (void* (*)(void*))IOCPClient::WorkThreadProc, this);
#endif
    }

    return TRUE;
}

DWORD WINAPI IOCPClient::WorkThreadProc(LPVOID lParam)
{
    IOCPClient* This = (IOCPClient*)lParam;
    char* szBuffer = new char[MAX_RECV_BUFFER];
    fd_set fd;
    struct timeval tm = { 2, 0 };
    CBuffer m_CompressedBuffer;

    while (This->IsRunning()) { // 没有退出，就一直陷在这个循环中
        if(!This->IsConnected()) {
            Sleep(50);
            continue;
        }
        FD_ZERO(&fd);
        FD_SET(This->m_sClientSocket, &fd);
#ifdef _WIN32
        int iRet = select(NULL, &fd, NULL, NULL, &tm);
#else
        int iRet = select(This->m_sClientSocket + 1, &fd, NULL, NULL, &tm);
#endif
        if (iRet <= 0) {
            if (iRet == 0) Sleep(50);
            else {
                Mprintf("[select] return %d, GetLastError= %d. \n", iRet, WSAGetLastError());
                This->Disconnect(); //接收错误处理
                m_CompressedBuffer.ClearBuffer();
                if(This->m_exit_while_disconnect)
                    break;
            }
        } else if (iRet > 0) {
            if (!This->ProcessRecvData(&m_CompressedBuffer, szBuffer, MAX_RECV_BUFFER - 1, 0)) {
                break;
            }
        }
    }
    CloseHandle(This->m_hWorkThread);
    This->m_hWorkThread = NULL;
    This->m_bWorkThread = S_STOP;
    This->m_bIsRunning = FALSE;
    delete[] szBuffer;

    return 0xDEAD;
}

bool IOCPClient::ProcessRecvData(CBuffer *m_CompressedBuffer, char *szBuffer, int len, int flag)
{
    int iReceivedLength = ReceiveData(szBuffer, len, flag);
    if (iReceivedLength <= 0) {
        int a = WSAGetLastError();
        Mprintf("[recv] return %d, GetLastError= %d. \n", iReceivedLength, a);
        Disconnect(); //接收错误处理
        m_CompressedBuffer->ClearBuffer();
        if (m_exit_while_disconnect)
            return false;
    } else {
        szBuffer[iReceivedLength] = 0;
        //正确接收就调用OnRead处理,转到OnRead
        OnServerReceiving(m_CompressedBuffer, szBuffer, iReceivedLength);
    }
    return true;
}

// 带异常处理的数据处理逻辑:
// 如果 f 执行时 没有触发系统异常（如访问冲突），返回 0
// 如果 f 执行过程中 抛出了异常（比如空指针访问），将被 __except 捕获，返回异常码（如 0xC0000005 表示访问违规）
int DataProcessWithSEH(DataProcessCB f, void* manager, LPBYTE data, ULONG len)
{
    __try {
        if (f) f(manager, data, len);
        return 0;
    } __except (EXCEPTION_EXECUTE_HANDLER) {
        return GetExceptionCode();
    }
}


VOID IOCPClient::OnServerReceiving(CBuffer* m_CompressedBuffer, char* szBuffer, ULONG ulLength)
{
    try {
        assert (ulLength > 0);
        //以下接到数据进行解压缩
        m_CompressedBuffer->WriteBuffer((LPBYTE)szBuffer, ulLength);
        int FLAG_LENGTH = m_Encoder->GetFlagLen();
        int HDR_LENGTH = m_Encoder->GetHeadLen();

        //检测数据是否大于数据头大小 如果不是那就不是正确的数据
        while (m_CompressedBuffer->GetBufferLength() > HDR_LENGTH) {
            // UnMask
            char* src = (char*)m_CompressedBuffer->GetBuffer();
            ULONG srcSize = m_CompressedBuffer->GetBufferLength();
            PkgMaskType maskType = MaskTypeUnknown;
            ULONG ret = TryUnMask(src, srcSize, maskType);
            // ULONG ret = m_masker->UnMask(src, srcSize);
            m_CompressedBuffer->Skip(ret);
            if (m_CompressedBuffer->GetBufferLength() <= HDR_LENGTH)
                break;

            char szPacketFlag[32] = {0};
            src = (char*)m_CompressedBuffer->GetBuffer();
            CopyMemory(szPacketFlag, src, FLAG_LENGTH);
            //判断数据头
            HeaderEncType encType = HeaderEncUnknown;
            FlagType flagType = CheckHead(szPacketFlag, encType);
            if (flagType == FLAG_UNKNOWN) {
                Mprintf("[ERROR] OnServerReceiving memcmp fail: unknown header '%s'. Mask: %d, Skip: %d.\n",
                        szPacketFlag, maskType, ret);
                m_CompressedBuffer->ClearBuffer();
                break;
            }

            ULONG ulPackTotalLength = 0;
            CopyMemory(&ulPackTotalLength, m_CompressedBuffer->GetBuffer(FLAG_LENGTH), sizeof(ULONG));

            //--- 数据的大小正确判断
            ULONG len = m_CompressedBuffer->GetBufferLength();
            if (ulPackTotalLength && len >= ulPackTotalLength) {
                ULONG ulOriginalLength = 0;

                m_CompressedBuffer->ReadBuffer((PBYTE)szPacketFlag, FLAG_LENGTH);//读取各种头部 shine
                m_CompressedBuffer->ReadBuffer((PBYTE) &ulPackTotalLength, sizeof(ULONG));
                m_CompressedBuffer->ReadBuffer((PBYTE) &ulOriginalLength, sizeof(ULONG));

                ULONG ulCompressedLength = ulPackTotalLength - HDR_LENGTH;
                const int bufSize = 512;
                BYTE buf1[bufSize], buf2[bufSize];
                PBYTE CompressedBuffer = ulCompressedLength > bufSize ? new BYTE[ulCompressedLength] : buf1;
                PBYTE DeCompressedBuffer = ulOriginalLength > bufSize ? new BYTE[ulOriginalLength] : buf2;

                m_CompressedBuffer->ReadBuffer(CompressedBuffer, ulCompressedLength);
                m_Encoder->Decode(CompressedBuffer, ulCompressedLength, (LPBYTE)szPacketFlag);
                size_t	iRet = uncompress(DeCompressedBuffer, &ulOriginalLength, CompressedBuffer, ulCompressedLength);

                if (Z_SUCCESS(iRet)) { //如果解压成功
                    //解压好的数据和长度传递给对象Manager进行处理 注意这里是用了多态
                    //由于m_pManager中的子类不一样造成调用的OnReceive函数不一样
                    int ret = DataProcessWithSEH(m_DataProcess, m_Manager, DeCompressedBuffer, ulOriginalLength);
                    if (ret) {
                        Mprintf("[ERROR] DataProcessWithSEH return exception code: [0x%08X]\n", ret);
                    }
                } else {
                    Mprintf("[ERROR] uncompress fail: dstLen %d, srcLen %d\n", ulOriginalLength, ulCompressedLength);
                    m_CompressedBuffer->ClearBuffer();
                }

                if (CompressedBuffer != buf1)delete [] CompressedBuffer;
                if (DeCompressedBuffer != buf2)delete [] DeCompressedBuffer;
            } else {
                break; // received data is incomplete
            }
        }
    } catch(...) {
        m_CompressedBuffer->ClearBuffer();
        Mprintf("[ERROR] OnServerReceiving catch an error \n");
    }
}


// 向server发送数据，压缩操作比较耗时。
// 关闭压缩开关时，SendWithSplit比较耗时。
BOOL IOCPClient::OnServerSending(const char* szBuffer, ULONG ulOriginalLength, PkgMask* mask)  //Hello
{
    AUTO_TICK(40, "");
    assert (ulOriginalLength > 0);
    {
        int cmd = BYTE(szBuffer[0]);
        //乘以1.001是以最坏的也就是数据压缩后占用的内存空间和原先一样 +12
        //防止缓冲区溢出//  HelloWorld  10   22
        //数据压缩 压缩算法 微软提供
        //nSize   = 436
        //destLen = 448
#if USING_ZLIB
        unsigned long	ulCompressedLength = (double)ulOriginalLength * 1.001  + 12;
#else
        unsigned long	ulCompressedLength = ZSTD_compressBound(ulOriginalLength);
#endif
        BYTE			buf[1024];
        LPBYTE			CompressedBuffer = ulCompressedLength>1024 ? new BYTE[ulCompressedLength] : buf;
        m_Locker.Lock();
        int	iRet = compress(CompressedBuffer, &ulCompressedLength, (PBYTE)szBuffer, ulOriginalLength);
        m_Locker.Unlock();
        if (Z_FAILED(iRet)) {
            Mprintf("[ERROR] compress failed: srcLen %d, dstLen %d \n", ulOriginalLength, ulCompressedLength);
            if (CompressedBuffer != buf)  delete [] CompressedBuffer;
            return FALSE;
        }
#if !USING_ZLIB
        ulCompressedLength = iRet;
#endif
        ULONG ulPackTotalLength = ulCompressedLength + m_Encoder->GetHeadLen();
        CBuffer m_WriteBuffer;
        HeaderFlag H = m_Encoder->GetHead();
        m_Encoder->Encode(CompressedBuffer, ulCompressedLength, (LPBYTE)H.data());
        m_WriteBuffer.WriteBuffer((PBYTE)H.data(), m_Encoder->GetFlagLen());

        m_WriteBuffer.WriteBuffer((PBYTE) &ulPackTotalLength,sizeof(ULONG));

        m_WriteBuffer.WriteBuffer((PBYTE)&ulOriginalLength, sizeof(ULONG));

        m_WriteBuffer.WriteBuffer(CompressedBuffer,ulCompressedLength);

        if (CompressedBuffer != buf) delete [] CompressedBuffer;

        STOP_TICK;
        // 分块发送
        return SendWithSplit((char*)m_WriteBuffer.GetBuffer(), m_WriteBuffer.GetBufferLength(), MAX_SEND_BUFFER, cmd, mask);
    }
}

//  5    2   //  2  2  1
BOOL IOCPClient::SendWithSplit(const char* src, ULONG srcSize, ULONG ulSplitLength, int cmd, PkgMask* mask)
{
    AUTO_TICK(50, std::to_string(cmd));
    if (src == nullptr || srcSize == 0 || ulSplitLength == 0)
        return FALSE;
    // Mask
    char* szBuffer = nullptr;
    ULONG ulLength = 0;
    (mask && srcSize <= ulSplitLength) ? mask->SetServer(m_sCurIP)->Mask(szBuffer, ulLength, (char*)src, srcSize, cmd) :
    m_masker->Mask(szBuffer, ulLength, (char*)src, srcSize, cmd);
    if(szBuffer != src && srcSize > ulSplitLength) {
        Mprintf("SendWithSplit: %d bytes large packet may causes issues.\n", srcSize);
    }
    bool         isFail = false;
    int			 iReturn = 0;   //真正发送了多少
    const char*  Travel = szBuffer;
    int			 i = 0;
    int			 ulSended = 0;
    const int	 ulSendRetry = 15;

    // 大包优化：当数据量超过阈值时，尝试一次性发送更大的块
    // SO_SNDBUF 已设为 256KB，可以尝试一次发送更多数据
    const ULONG LARGE_PACKET_THRESHOLD = 256 * 1024;  // 256KB
    ULONG actualSplitLength = ulSplitLength;
    if (ulLength >= LARGE_PACKET_THRESHOLD) {
        // 大包使用更大的分块，减少系统调用次数
        actualSplitLength = 256 * 1024;  // 一次发送256KB
    }

    // 依次发送
    for (i = ulLength; i >= (int)actualSplitLength; i -= actualSplitLength) {
        int j = 0;
        for (; j < ulSendRetry; ++j) {
            iReturn = SendTo(Travel, actualSplitLength, 0);
            if (iReturn > 0) {
                break;
            }
        }
        if (j == ulSendRetry) {
            isFail = true;
            break;
        }

        ulSended += iReturn;
        Travel += actualSplitLength;
    }
    // 发送最后的部分
    if (!isFail && i>0) { //1024
        int j = 0;
        for (; j < ulSendRetry; j++) {
            iReturn = SendTo((char*)Travel,i,0);

            if (iReturn > 0) {
                break;
            }
        }
        if (j == ulSendRetry) {
            isFail = true;
        }
        ulSended += iReturn;
    }
    if (szBuffer != src)
        SAFE_DELETE_ARRAY(szBuffer);
    if (isFail) {
        return FALSE;
    }

    return (ulSended == ulLength) ? TRUE : FALSE;
}


VOID IOCPClient::Disconnect()
{
    if (m_sClientSocket == INVALID_SOCKET)
        return;

    Mprintf("Disconnect with [%s:%d].\n", m_sCurIP.c_str(), m_nHostPort);

    CancelIo((HANDLE)m_sClientSocket);
    closesocket(m_sClientSocket);
    m_sClientSocket = INVALID_SOCKET;

    m_bConnected = FALSE;
}


VOID IOCPClient::RunEventLoop(const BOOL &bCondition)
{
    Mprintf("======> RunEventLoop begin\n");
    while ((m_bIsRunning && bCondition) || bCondition == FOREVER_RUN)
        Sleep(200);
    setManagerCallBack(NULL, NULL);
    Mprintf("======> RunEventLoop end\n");
}


BOOL is_valid()
{
    return TRUE;
}

VOID IOCPClient::RunEventLoop(TrailCheck checker)
{
    Mprintf("======> RunEventLoop begin\n");
    checker = checker ? checker : is_valid;
#ifdef _DEBUG
    checker = is_valid;
#endif
    while (m_bIsRunning && checker())
        Sleep(200);
    setManagerCallBack(NULL, NULL);
    Mprintf("======> RunEventLoop end\n");
}