作业广播的服务器和客户端组播的客户端和服务器_编写多播的服务器端和客户端-优快云博客

本文链接：https://blog.youkuaiyun.com/shen20010928/article/details/128009020

本文展示了三个使用UDP套接字进行广播、多播的实例。第一个程序创建一个套接字并绑定到特定端口，等待接收广播消息。第二个程序设置套接字选项以发送广播消息。第三个程序加入一个多播组并接收多播数据。所有程序都包含错误处理和简单的输入输出操作。

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#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>


#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__",__LINE__);\
}while(0);

int main(int argc, const char *argv[])
{
	//创建套接字
	int sfd=socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}


	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port =htons(4433);
	sin.sin_addr.s_addr=inet_addr("192.168.31.255");


    if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("绑定成功\n");

	ssize_t res =0;
	char buf[128]="";


	struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);


	while(1)
	{
		bzero(buf,sizeof(buf));
		res=recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
		if(res<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("%s\n",buf);
	}
	close(sfd);

	return 0;
}

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__",__LINE__);\
}while(0)

 int main(int argc, const char *argv[])
 {
 	//创建套接字
	int sfd =socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}



	int broad =1;
	if(setsockopt(sfd,SOL_SOCKET,SO_BROADCAST,&broad,sizeof(broad))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}



	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port   = htons(4433);
	sin.sin_addr.s_addr =inet_addr("192.168.31.255");


	char buf[128]="";
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
        
		if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin))<0)
		{
			ERR_MSG("sendto");
			return -1;
		}
		printf("发送成功\n");
	}
	close(sfd);

 	return 0;
 }

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>
#include <net/if.h>


#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__",__LINE__);\
}while(0)

int main(int argc, const char *argv[])
{
	//创建套接字
	int sfd =socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{	
		ERR_MSG("socket");
		return -1;
	}


    //
	struct ip_mreqn mq;
	mq.imr_multiaddr.s_addr =inet_addr("224.1.2.3");
	mq.imr_address.s_addr =inet_addr("192.168.43.170");
	mq.imr_ifindex =if_nametoindex("ens33");

	if(setsockopt(sfd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mq,sizeof(mq))<0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	printf("加入多组播成功\n");


	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(8888);
	sin.sin_addr.s_addr =inet_addr("224.1.2.3");



	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}


	ssize_t res =0;
	char buf[128]="";
    struct sockaddr_in cin;
	socklen_t addrlen=sizeof(cin);


	while(1)
	{
		bzero(buf,sizeof(buf));
		res = recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
		if(res<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("%s\n",buf);
	}



	return 0;
}

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <string.h>
#include <unistd.h>

#define ERR_MSH(mag) do{\
	fprintf(stderr,"__%d__",__LINE__);\
}while(0);

int main(int argc, const char *argv[])
{
	int sfd =socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{
		ERR_MSH("socket");
		return -1;
	}


	struct sockaddr_in sin;
	sin.sin_family =AF_INET;
	sin.sin_port=htons(8888);
	sin.sin_addr.s_addr=inet_addr("224.1.2.3");


	char buf[128]="";
	
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("请输入\n");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin))<0)
		{
			ERR_MSH("sendto");
			return -1;
		}
		printf("发送成功\n");
	}
	close(sfd);

	return 0;
}