Tcp server：#include #include #include
#pragma comment( lib, "ws2_32.lib" )
void main()
{ //参数声明
WSADATA wsaData; SOCKET ServerSocket; SOCKET NewSocket;
SOCKADDR_IN ServerAddr; SOCKADDR_IN ClientAddr;
intClientAddrLen;intServerPort = 4000;
wsastarup（makeword（1，0），&wsadata）//初始化windows socket
//创建socket
ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons(ServerPort);
ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(ServerSocket, (SOCKADDR*) &ServerAddr, sizeof(ServerAddr)); //绑定
listen(ServerSocket, 5);//监听
do{NewSocket=accept(ServerSocket,(SOCKADDR*)&ClientAddr,&ClientAddrLen);CreateThread(NULL, 0, DealHandler, (void*)NewSocket, 0, NULL)；//线程回调
}while (1);
recv(newsocket,receivebuffer,sizeof(receivebuffer)-1,0)//接收
send(newsocket, receive buffer,strlen(receivebuffer),0)//发送
closesocket (newsocket);
closesocket (serversocket);//关闭
wsacleanup()//释放
｝
DWORD WINAPI DealHandler(void* sd_)
{intnRetval;SOCKET sd = (SOCKET)sd_;nRetval=DealReq(sd);
returnnRetval;}
连接请求：
connect(clientsocket,(socketaddr*)&serveraddr,sizef(serveraddr);
抓包
#include "stdio.h"#include "Winsock2.h"#include "time.h"#pragma comment(lib,"WS2_32.lib")
#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
int main(intargc, char **argv)
{//定义参数
SOCKET SnifferSocket;intResult;char Packet[6000];WSADATA wsaData;
Result = WSAStartup(MAKEWORD(2, 2), &wsaData); //初始化
SnifferSocket = socket(AF_INET, SOCK_RAW, IPPROTO_IP);//创建原始socket
structsockaddr_in sock={0};structhostent *pHostent;char Name[255];
sock.sin_family = AF_INET；Result = gethostname(Name, sizeof(Name)); //获取主机名
pHostent = gethostbyname(Name); //用主机名获取IP
memcpy(&sock.sin_addr, pHostent->h_addr_list[0], pHostent->h_length);
Result = bind(SnifferSocket, (PSOCKADDR) &sock, sizeof(sock));//绑定
Result =ioctlsocket(SnifferSocket, SIO_RCVALL, &dwBufferInLen);//设置混杂模式
intpacketcount = 0;structsockaddr_in from;//rendbintfromlen ;time_t temp;
while (true)
{fromlen=sizeof(from);
Result=recvfrom(SnifferSocket,Packet,,izeof(Packet),0);//读取数据
packetcount++;time(&temp);if (packetcount==70) break;}
closesocket(SnifferSocket);WSACleanup();return 1;}
窗口
#include#include "resource.h"
BOOL WINAPI DlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
{DialogBoxParam(
hInstance,// 实例句柄(LPCTSTR)IDD_DIALOG1, // 对话框资源ID号NULL, // 父窗口句柄
DlgProc, // 消息处理函数0); // 对话框初始化的值，在WM_INITDIALOG消息lParam参数中取出
return 0;}
char szLText[]="鼠标左键";char szOKText[]="OK button";HWNDMyList;
BOOL WINAPI DlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{switch(message){
case WM_INITDIALOG:
MyList=GetDlgItem(hDlg, IDC_LIST1);
SendMessage(MyList, LB_ADDSTRING, NULL, (long)"初始化了");
break;
case WM_LBUTTONDOWN: // 显示给用户, 向列表框控件中添加文本
SendMessage(MyList, LB_ADDSTRING, NULL, (long)szLText);
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDOK:
SendMessage(MyList, LB_ADDSTRING, NULL, (long)szOKText);
break;
case IDCANCEL: // 退出程序
EndDialog (hDlg, IDCANCEL);
break;
}
break;
}
return 0;
}
Tcp的特点
（1）面向流的投递服务
应用程序之间传输的数据可视为无结构的字节流（或位流），流投递服务保证收发的字节顺序完全一致
2）面向连接的投递服务
数据传输之前，TCP模块之间需建立连接（类似虚电路），其后的TCP报文在此连接基础上传输。
（2）可靠传输服务
接收方根据收到的报文中的校验和，判断传输的正确性：如果正确，进行应答，否则丢弃报文。发送方如果在规定的时间内未能获得应答报文，自动进行重传。
（4）缓冲传输
