rserver.cpp

关于win2000核心编程的文章

/***************************************************************|
                        Author:   JIURL
						Email:    [e-mail]
						Homepage: http://jiurl.yeah.net
/***************************************************************/
#include <winsock2.h>
#include <windows.h>
#include <stdio.h>
#include <ws2tcpip.h> 
#include <conio.h>

#pragma comment(lib,"ws2_32.lib")

void RawServer();

void main()
{
	WSADATA wsaData;

	WSAStartup(0x0202, &wsaData);

	RawServer();

	WSACleanup();
}

//////////////////////////////////////////////////////////
void RawServer()
{
	int nRet;
	SOCKET theSocket;

	theSocket = socket(AF_INET, SOCK_RAW, 255);
	if (theSocket == INVALID_SOCKET)
	{
		printf("socket() error\n");
		return;
	}

	SOCKADDR_IN saServer;

	saServer.sin_family = AF_INET;
	saServer.sin_addr.s_addr = INADDR_ANY; // Let WinSock assign address
	saServer.sin_port = 0;	   // Use port passed from user

	nRet = bind(theSocket,				// Socket descriptor
				(LPSOCKADDR)&saServer,  // Address to bind to
				sizeof(struct sockaddr)	// Size of address
				);
	if (nRet == SOCKET_ERROR)
	{
		printf("bind() error\n");
		closesocket(theSocket);
		return;
	}

	///////////////////////////////////////////////////
	int nLen;
	nLen = sizeof(SOCKADDR);
	char szBuf[1024];

	nRet = gethostname(szBuf, sizeof(szBuf));
	if (nRet == SOCKET_ERROR)
	{
		printf("gethostname() error\n");
		closesocket(theSocket);
		return;
	}

	LPHOSTENT lpHostEntry;
	lpHostEntry = gethostbyname(szBuf);

	printf("Server named %s addr %s \n\n",
			szBuf, inet_ntoa(*(LPIN_ADDR)lpHostEntry->h_addr));
	///////////////////////////////////////////////////

	SOCKADDR_IN saClient;

	memset(szBuf, 0, sizeof(szBuf));

	nRet = recvfrom(theSocket,				// Bound socket
					szBuf,					// Receive buffer
					sizeof(szBuf),			// Size of buffer in bytes
					0,						// Flags
					(struct sockaddr*)&saClient,	// Buffer to receive client address 
					&nLen);					// Length of client address buffer
	if(nRet!=SOCKET_ERROR)
	{
		printf("Server recv: %s\n",szBuf+20);
	}
	else
	{
		printf("recv error: %d\n",WSAGetLastError());
		closesocket(theSocket);
		return;
	}

	getch();
	closesocket(theSocket);
	return;
}