UDP 局域网广播包 Linux/Mac 服务端 客户端 Windows客户端 测试代码

昨晚为了整理了局域网广播测试代码，自己懒得写，网上copy整理下，用Linux/Mac做服务端，WIN10客户端。

目的主要测试下WIN10下广播包的收发。有兴趣可以参考下。在局域网多台电脑上测试下广播包的收发.

demo代码来源于网络，稍做修改，这里做了个全平台整理，方便测试。如有不妥，请联系本人。

WIN10用VC2017创建一个CONSOLE工程。编译运行即可，CONSOLE中监听CTR-C事件，否则无法退出。编译运行即可

winclient.cpp

#include <iostream>

#include <WinSock2.h>  
#include <windows.h> 
#include <stdio.h> 

#pragma comment(lib, "WS2_32.lib") 

BOOL mbCloseConsole = false;

BOOL CtrlHandler(DWORD fdwCtrlType)
{
	switch (fdwCtrlType)
	{
		// Handle the CTRL-C signal. 
	case CTRL_C_EVENT:
		printf("Ctrl-C event/n/n");
		mbCloseConsole = true;
		return(TRUE);

	case CTRL_CLOSE_EVENT:
		printf("Ctrl-Close event/n/n");
		mbCloseConsole = true;
		return(TRUE);

	default:
		return FALSE;
	}
	return TRUE;
}


int main(int argc, char* argv[])
{
	WORD wVersionRequested = MAKEWORD(2, 2);
	WSADATA wsaData;
	mbCloseConsole = false;
	if (0 != WSAStartup(wVersionRequested, &wsaData))
	{
		printf("WSAStartup failed with error: %d/n", GetLastError());
		return EXIT_FAILURE;
	}
	if (2 != HIBYTE(wsaData.wVersion) || 2 != LOBYTE(wsaData.wVersion))
	{
		printf("Socket version not supported./n");
		WSACleanup();
		return EXIT_FAILURE;
	}
	SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (INVALID_SOCKET == sock)
	{
		printf("socket failed with error: %d/n", WSAGetLastError());
		WSACleanup();
		return EXIT_FAILURE;
	}
	SOCKADDR_IN addr;
	memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.S_un.S_addr = htonl(INADDR_BROADCAST);
	addr.sin_port = htons(5001);
	BOOL bBoardcast = TRUE;
	if (SOCKET_ERROR == setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char*)&bBoardcast, sizeof(bBoardcast)))
	{
		printf("setsockopt failed with error code: %d/n", WSAGetLastError());
		if (INVALID_SOCKET != sock)
		{
			closesocket(sock);
			sock = INVALID_SOCKET;
		}
		WSACleanup();
	}
	printf("Server start, start to boardcast .../n");
	char buf[] = { "Hello, this is boardcast!" };
	SetConsoleCtrlHandler((PHANDLER_ROUTINE)CtrlHandler, TRUE);
	while (!mbCloseConsole)
	{
		if (SOCKET_ERROR == sendto(sock, buf, sizeof(buf), 0, (LPSOCKADDR)&addr, sizeof(addr)))
		{
			printf("sendto failed with error: %d/n", WSAGetLastError());
			continue;
		}
	}
	WSACleanup();
	return 0;
}

LINUX MAC下做服务端

server.cpp

#include <iostream>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
 
using namespace std;
 
int main()
{
	int sock = -1;
	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) 
	{   
		cout<<"socket error"<<endl;	
		return false;
	}   
	
	const int opt = 1;
	//设置该套接字为广播类型，
	int nb = 0;
	nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));
	if(nb == -1)
	{
		cout<<"set socket error..."<<endl;
		return false;
	}
 	//指定Server IP  和  发送给Client的端口
	struct sockaddr_in addrto;
	bzero(&addrto, sizeof(struct sockaddr_in));
	addrto.sin_family=AF_INET;
	addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST);
	addrto.sin_port=htons(5001);
	int nlen=sizeof(addrto);
 	cout<<"send broadcast... "<<endl;
	while(1)
	{
		sleep(1);
		//从广播地址发送消息
		char smsg[] = {"abcdef"};
		int ret=sendto(sock, smsg, strlen(smsg), 0, (sockaddr*)&addrto, nlen);
		if(ret<0)
		{
			cout<<"send error...."<<ret<<endl;
		}
		else
		{		
			cout<<"send broadcast ok... "<<endl;	
		}
		cout<<"send broadcast : "<<ret<<endl;
		
	}
	return 0;
}

命令行运行 g++  server.cpp -o server  然后执行 ./server即可

LINUX MAC下客户端

client.cpp

#include <iostream>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
 
using namespace std;
 
int main()
{
	int sock = -1;
	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) 
	{   
		cout<<"socket error"<<endl;	
		return false;
	}   
	
	// 广播地址
	struct sockaddr_in from;
	bzero(&from, sizeof(struct sockaddr_in));
	from.sin_family = AF_INET;
	from.sin_addr.s_addr = htonl(INADDR_ANY);
	from.sin_port = htons(5001);


	
	if(bind(sock,(struct sockaddr *)&(from), sizeof(struct sockaddr_in)) == -1) 
	{   
		cout<<"bind error..."<<endl;
		return false;
	}
 
	int len = sizeof(sockaddr_in);
	char smsg[100] = {0};
 
	while(1)
	{
		//从广播地址接受消息
		int ret=recvfrom(sock, smsg, 100, 0, (struct sockaddr*)&from,(socklen_t*)&len);
		if(ret<=0)
		{
			cout<<"read error...."<<sock<<endl;
		}
		else
		{		
			printf("%s\t", smsg);	
		}
		cout<<"RECV::::"<<ret<<endl;
		sleep(1);
	}
	return 0;
}

命令行运行 g++  client.cpp -o client  然后执行 ./client即可